Architect vs Building Designer for Australian Property Developers

Most articles comparing architects to building designers in Australia are written for homeowners weighing up a single project — extension, knockdown-rebuild, dream home. They argue about creative flair, fee percentages, and council acceptance through that lens. For a property developer, the calculus is entirely different. The decision shapes your design risk, your D&C tender pack, who can legally sign your Design Verification Statement, whether your project qualifies under the NSW Low Rise Housing Diversity Code, and ultimately what your design line item does to your residual land value. It also varies enormously by state — Victoria, Queensland, and Tasmania require building designers to hold a statutory licence, while South Australia and Western Australia (in 2026) generally do not, and New South Wales added a separate registration regime for designers working on Class 2 apartment buildings under the Design and Building Practitioners Act 2020.

This guide approaches the question through a developer’s lens. It covers the legal status of each role in every Australian state and territory, the project types where one option is mandatory rather than optional, fee structures and how they typically behave at different development scales, the contractual mechanics of novation and design-and-construct procurement, professional indemnity insurance implications, and a decision framework you can apply to your next site. The aim is to help you avoid the two costly mistakes developers tend to make — engaging an architect for a job that didn’t need one (and paying for unused service depth) or engaging a building designer for a job that legally required an architect (and discovering it at certification).

The Legal Framework: Title Protection vs Practice Regulation

The single most important concept to understand is the difference between title regulation and practice regulation. In every Australian jurisdiction, “architect” is a protected title. Under the NSW Architects Act 2003 and equivalent state legislation, only individuals registered with the relevant state Architects Registration Board may call themselves architects, advertise as architects, or hold themselves out as architects. The NSW Architects Registration Board notes that breaching these provisions can attract significant penalties. The same logic operates in every state through bodies including the Architects Registration Board of Victoria, the Board of Architects of Queensland, and the Architectural Practice Board of South Australia.

What this typically does not do, however, is reserve the practice of building design exclusively to architects. With limited exceptions discussed below, anyone competent to design a building may do so, regardless of whether they hold the architect title. This is why building designers, draftspersons, and even owner-builders can prepare plans for a wide range of residential and small commercial projects. The protection sits on the word, not the work.

The exceptions matter, and they have grown significantly since 2020. Several states now overlay practice-based registration for building designers themselves, and New South Wales has gone further by requiring specific registration for any designer working on Class 2 (apartment) buildings irrespective of profession. The result is a patchwork that varies state by state, and the right answer to “do I need an architect?” depends on what you are building, where, and at what scale.

What Is a Registered Architect?

A registered architect in Australia is an individual who has completed a five-year accredited architecture qualification (typically a Bachelor’s degree followed by a Master of Architecture), accumulated at least two years of logged supervised practical experience, and passed the Architectural Practice Examination administered by the Architects Accreditation Council of Australia (AACA). After registration with a state board, an architect must complete annual continuing professional development and maintain professional indemnity insurance to stay on the register.

For developers, the implications of the registered architect framework typically include:

• Mandatory professional indemnity insurance. Every registered architect must hold current PI cover as a condition of registration. If a design error causes you loss, you generally have an insured party to claim against. The minimum level of cover is set by the state registration board and may vary, but the obligation itself is universal.
• Code of conduct and complaints process. Architects are bound by state codes of professional conduct, and you have a statutory pathway to complain to the registration board if the relationship breaks down. This is occasionally useful for resolving disputes without litigation.
• Acceptance under specific codes. Certain planning and design pathways — most notably the NSW Low Rise Housing Diversity Code and various state apartment design codes — recognise architects automatically as qualified designers without further accreditation requirements.
• Broader scope of typical service. The conventional architectural appointment under documents such as the Australian Institute of Architects Client Architect Agreement is end-to-end: schematic design, design development, documentation, tendering, contract administration, and post-occupancy. Building designers more commonly stop at documentation.

The trade-off, of course, is fee. Architect engagements typically cost more both in absolute terms and as a percentage of construction value, and for the right project that premium is justified. For the wrong project — a straightforward dual occupancy on a flat block in a non-complex zone — it may not be.

What Is a Building Designer?

A building designer is a professional who designs buildings without holding the protected architect title. The term covers an enormous range of practitioners, from TAFE-trained draftspersons producing simple residential plans through to highly experienced designers with decades of multi-unit and small commercial work. The defining feature is that the title itself is not nationally regulated, although several states now impose practice-based registration on the role.

Most credible building designers in Australia hold membership of the Building Designers Association of Australia (BDAA) or a state body such as Building Designers Association of Victoria. These bodies typically require members to maintain continuing professional development, hold professional indemnity insurance, and operate under a code of conduct. Membership and accreditation are voluntary in some states but effectively mandatory in others (Victoria, Queensland, Tasmania), where statutory registration substitutes for or sits alongside association accreditation.

The BDAA also operates an accreditation framework — including its Low Rise Accreditation, which the BDAA describes as covering Class 1 and 10 buildings as well as Class 2 to 9 buildings up to two storeys and 2,000 square metres, excluding Type A construction. This accreditation is one of the two qualifications that can sign a Design Verification Statement under the NSW Low Rise Housing Diversity Code, which is discussed in detail later in this guide.

From a developer’s perspective, the practical differences from architects typically include:

• Variable training and experience. A building designer with 20 years of multi-unit development experience and current state registration is a very different proposition from a recent TAFE graduate. Verification of credentials matters more here than with architects.
• More commonly fixed fees or hourly rates. Architects typically prefer percentage-of-cost structures; building designers more often quote fixed fees for defined scopes, which can suit developers running tight feasibility analyses.
• Generally narrower default scope. Many building designer appointments stop at documentation for approval (DA or Complying Development Certificate). Contract administration and site supervision are often paid extras or excluded entirely.
• Council acceptance varies. For straightforward projects in low-complexity zones, building designer plans are accepted routinely. For heritage areas, sensitive sites, large multi-unit developments, or projects requiring complex urban design responses, councils may be less receptive — though this is rarely a statutory bar outside the specific code carve-outs.

State-by-State Registration: Where the Differences Bite

Because building designer regulation is set at state level, the answer to “can my building designer legally undertake this project?” depends on the jurisdiction. The summary table below is a starting point; the sections beneath unpack each state.

Victoria

Victoria operates the most developed building designer registration regime in the country. Under the Building Act 1993, building designers must hold registration as building practitioners through the Building Practitioners Board (now operating within the Building and Plumbing Commission, formerly the Victorian Building Authority). The Victorian Building Authority confirms that practitioner registration is a statutory requirement and provides a searchable register.

Within the building designer category, registrations are divided into classes — historically including Building Design (Architectural), Building Design (Interior), and Building Design (Services). The Architectural class is the one relevant to most property development work. The VBA noted in 2024 that two registration classes have been renamed to align with new category titles (“Building Designer” and “Project Manager”) under updates to the Building Act 1993.

For developers operating in Victoria, the takeaway typically is that you should engage either a registered architect or a registered building designer — never a draftsperson without registration — and you should verify registration on the public register before signing. Engaging an unregistered designer can put your building permit at risk and may compromise your insurance coverage.

Queensland

Queensland has the most granular building designer licensing in Australia, administered by the Queensland Building and Construction Commission. Building design licences come in three classes that broadly correspond to project complexity and scale:

• Building design — low rise. Covers Class 1 and 10 buildings (detached dwellings, dual occupancies, sheds, garages) and Class 2 to 9 buildings up to two storeys and 2,000 square metres (excluding Type A construction). This is the appropriate class for most small-scale developer work — duplexes, townhouses, small commercial.
• Building design — medium rise. Extends scope to Class 2 to 9 buildings up to three storeys and 12,500 square metres. Captures most genuinely “medium-density” developer projects including small apartment buildings and larger townhouse complexes.
• Building design — open. Unrestricted scope. The class equivalent to an architectural firm’s full residential and commercial reach.

The QBCC’s licence guidance sets out the experience, qualification, and PI insurance prerequisites for each class. For developers, the critical implication is that you must match your designer’s licence class to your building. A low-rise licensed designer cannot lawfully prepare documents for a five-storey apartment building. Failing to verify this can result in your building approval being challenged or, worse, your statutory warranties and PI claims becoming complicated post-completion.

New South Wales

New South Wales is the most complex jurisdiction because it operates a dual layer. For most residential and small commercial work — single dwellings, dual occupancies, townhouses, low-rise commercial — there is no mandatory state registration for building designers. Anyone competent may prepare and lodge plans, although NSW Fair Trading does maintain registration for certain residential building licences.

The picture changes substantially for Class 2 buildings (apartment buildings) and mixed-use buildings containing a Class 2 part. The Design and Building Practitioners Act 2020 (the DBP Act), enacted in response to high-profile Class 2 building failures including Opal Tower and Mascot Towers, requires registration of design practitioners, principal design practitioners, professional engineers, building practitioners, and specialist practitioners working on Class 2 buildings. The legal commentary on the DBP Act notes that any practitioner failing to make required declarations, or making declarations when unregistered, faces a maximum penalty of $165,000 for a body corporate or $55,000 in any other case.

Practical effects for developers undertaking apartment projects in NSW typically include:

• Every designer producing regulated designs (architectural, structural, fire, hydraulic, mechanical) must be registered under the DBP Act before lodging.
• Designers must declare their designs comply with the National Construction Code and other applicable standards.
• Continuing professional development is mandatory — designers must complete at least three hours of approved education annually.
• Registration is searchable on NSW Fair Trading’s online register; verifying it before engagement is straightforward and prudent.

The DBP Act applies whether the designer is a registered architect or a building designer. Architects are not automatically exempted; they too must register under the DBP framework if they want to lodge Class 2 work.

There is also the NSW Architects Act 2003, administered by the NSW Architects Registration Board, which protects the architect title but does not prevent non-architects from practising. The two regimes are independent: architect title regulation under the Architects Act is separate from designer practice regulation under the DBP Act for Class 2 work.

Queensland (additional regulatory context)

In addition to QBCC licensing, Queensland operates the Board of Architects of Queensland, which registers architects and protects the title. For most developer projects under three storeys, a QBCC-licensed building designer of the appropriate class is the most common practitioner type. Larger or more architecturally sensitive projects often justify engagement of a registered architect, particularly when council design panels or design quality codes are invoked.

Tasmania

Tasmania regulates building designers under the Building Act 2016, administered by Consumer, Building and Occupational Services (CBOS). The CBOS framework licenses building designers in three sub-classes broadly aligned to project complexity, with each sub-class requiring minimum qualifications, supervised experience, and PI insurance.

Tasmania also operates a separate Building Services Designer licence for practitioners designing specific building services rather than whole-of-building design. For developers, the practical position mirrors Victoria — engage a building designer holding the appropriate sub-class licence, verify it, and check PI cover.

South Australia

South Australia does not currently operate a mandatory state registration scheme for building designers. Building designers practising in South Australia commonly hold voluntary BDAA membership and accreditation. The Architectural Practice Board of South Australia regulates architects under separate legislation.

For developers, the absence of mandatory licensing increases the importance of verifying a building designer’s experience, association membership, qualifications, and PI cover before engagement. The state regulator’s standards still apply to the building itself — qualification or otherwise of the designer does not change what the building must comply with.

Western Australia

Western Australia, like South Australia, does not currently mandate registration for building designers as a separate occupation. The Architects Board of Western Australia regulates architects under the Architects Act 2004 (WA).

It is worth noting that Western Australia introduced a registration scheme for building engineers from 1 July 2024, phasing in registration of structural, fire safety, fire systems, civil, and mechanical building engineers between 2024 and 2027. This regime does not directly affect building designers but does change the regulatory environment for the broader design team and may foreshadow further reform.

Australian Capital Territory

The ACT regulates several construction occupations through the Construction Occupations (Licensing) Act 2004, administered by Access Canberra. The Act licenses builders (Classes A, B, C, D), building surveyors, and certain other construction-related occupations. Architects are registered under separate ACT architects legislation administered by the ACT Architects Board.

The current position on standalone building designer licensing in the ACT continues to evolve. Developers should verify the licensing status of any building designer with Access Canberra before engagement and check that the designer holds current PI insurance.

Northern Territory

The Northern Territory regulates building designers under its Building Practitioners Board framework. Designers preparing drawings for building permits must hold Building Practitioner Registration in the Design category — typically Design (Restricted) or Design (Unrestricted) depending on the scope of work. The NT also separately registers Certifying Architects.

For developers in the NT, the typical practice is to confirm registration on the Register of Building Practitioners before engagement, verify the registration category covers the building type intended, and confirm PI insurance is current.

The Class 2 Question: Apartment Buildings Change the Rules

If you are building or considering an apartment project — anything that is a Class 2 building or contains a Class 2 part under the National Construction Code — the design practitioner conversation becomes substantially more constrained. A Class 2 building is, in essence, a building containing two or more sole-occupancy units that are separate dwellings stacked or arranged so they form an apartment building. The category captures most multi-unit residential developments above townhouse scale.

In NSW, the DBP Act 2020 means every designer producing a “regulated design” for Class 2 work must be registered. This is regardless of whether they are an architect, engineer, building designer, draftsperson, or specialist consultant. Architects are not exempt; they must hold both their NSW Architects Registration Board registration and DBP Act registration as a design practitioner.

In Queensland, QBCC licensing classes determine which designers can lawfully prepare documents for which building types. Class 2 apartment buildings above two storeys require at least medium-rise licensing; larger apartment buildings require the open class.

In Victoria, the registered building designer regime applies to apartment work, although the specific class requirements should be verified against current BPC guidance.

Other states have not yet introduced equivalent designer-registration regimes specifically targeting Class 2 work, but the federal trajectory — supported by the Australian Building Codes Board’s National Registration Framework — suggests further harmonisation is likely. Developers should plan for further regulation rather than fewer obligations.

From a practical perspective, Class 2 projects typically warrant engagement of a registered architect rather than a building designer, except in jurisdictions where appropriately licensed building designers (Victoria’s registered building designers, Queensland’s medium-rise or open licensed designers) have specific scope to operate. Even in those jurisdictions, the design quality demands of multi-unit residential — buildability, fire engineering coordination, acoustic separation, accessibility, durability — often justify architect engagement.

The Low Rise Housing Diversity Code: When Architect or BDAA Is Mandatory

The NSW Low Rise Housing Diversity Code is one of the most important developer-focused planning instruments introduced in the last decade. It allows dual occupancies, terraces, manor houses, and certain alterations to be approved as complying development within 20 days (rather than through a months-long DA process), provided the proposal meets the code’s design and built-form standards.

For practitioner selection, the Code does something that few articles aimed at homeowners explain: it restricts who can sign the mandatory Design Verification Statement. Under the Environmental Planning and Assessment Regulation, the qualified designer for a Low Rise Housing Diversity Code development must be either:

• A person registered as an architect under the Architects Act 2003, or
• A building designer who holds Building Designers Association of Australia accreditation at the relevant level.

This is not a statement about competence or recommendation — it is a regulatory requirement. A general building designer without BDAA accreditation, however skilled, may design the building but cannot sign the Design Verification Statement that the Code requires. Without that statement, the Complying Development Certificate cannot be issued, the 20-day fast-track is unavailable, and the project may fall back into the standard DA pathway.

For developers regularly working in NSW R1, R2, R3, and RU5 zones — the four zones where the Code operates — this fundamentally narrows the engagement choice. Either you engage a registered architect, or you engage a BDAA-accredited building designer. The cheapest credentialed designer in the market who lacks BDAA accreditation is, for this specific use case, not a real option.

Other state apartment design codes operate similar provisions for their respective fast-track or complying development pathways. The Apartment Design Guide under State Environmental Planning Policy No 65 in NSW (now reflected in the SEPP (Housing) 2021) sets analogous requirements for Class 2 buildings, where the involvement of a registered architect is required for design verification. Victoria and Queensland have parallel design quality frameworks for higher-density work.

Fee Structures: How the Money Actually Lands

Most articles compare architect and building designer fees on a single per cent or per dollar basis. The reality is more textured. The fee structures themselves are different, the underlying scope is different, and the way each behaves at different development scales differs again.

Architect fee structures

Architects most commonly charge on one of three models, or some combination:

• Percentage of construction cost. The traditional structure, used heavily by the AIA and recognisable to most practitioners. The Australian Institute of Architects and member firms typically quote between roughly 5 per cent and 15 per cent of construction cost across different project types. The architect’s actual scope (full service vs partial service) and project complexity drive where in that range a given engagement sits. Higher-complexity projects, heritage works, design-quality-driven schemes, and projects under three to four million in construction value tend toward the higher end. Lower-complexity work, large repetitive residential projects, and developer-friendly negotiated fees tend toward the lower end.
• Lump sum / fixed fee. Increasingly common for developer engagements where scope and brief are well-defined upfront. The lump sum approach gives the developer cost certainty and the architect a defined deliverable. Variations are priced separately.
• Hourly rates. Less common for full-service residential and commercial work but useful for advisory engagements, peer review, masterplanning workshops, and post-occupancy support.

A representative phased percentage breakdown — varying by firm — might be in the order of: 1 per cent to 1.5 per cent for sketch design, 1.5 per cent to 2 per cent for design development, 2.5 per cent to 3.5 per cent for construction documentation, and 1.5 per cent to 2.5 per cent for tendering and contract administration. Full-service architect engagements typically aggregate to somewhere between 7 per cent and 12 per cent of construction cost for development-scale projects, with developer-favourable negotiated arrangements potentially landing lower for repeat clients on simpler typologies.

Building designer fee structures

Building designers typically operate on one of two models:

• Fixed fee for defined deliverable. The most common approach. The designer quotes a number for, say, “DA-ready drawings for a dual occupancy on lot X” or “construction documents for a four-pack townhouse development”. Stages are quoted separately. Variations are billed extra.
• Percentage of construction cost. Less common than for architects but sometimes used, typically at a lower rate — broadly 3 per cent to 6 per cent of construction cost is the common range cited across industry guidance, though it varies meaningfully with project type and the designer’s scope of service.

The total cost difference at the project level is rarely a clean “architect costs 10 per cent, building designer costs 4 per cent”. The architect’s percentage typically covers more service depth (contract administration, on-site supervision, defects period inspections), while the building designer’s fixed fee often does not. To compare like with like, the developer must specify the scope they actually need from each option.

Where each fee model bites the developer harder

The percentage model has a quiet tail. As construction cost escalates — through variations, material price movement, scope creep — the architect’s fee escalates with it. On a project budgeted at three million in construction cost that ends up at three and a half million, the architect’s fee at 8 per cent grows by forty thousand. That is fair compensation for the additional work scope creep typically generates, but it is also a sensitivity that affects feasibility outcomes.

The fixed fee model has the opposite tail. The designer’s incentive is to deliver the agreed scope efficiently. If the project’s brief proves under-specified, the developer pays for variations rather than absorbing them within the fee. Heavy variation projects can erode the fixed-fee saving fairly quickly.

For development feasibility modelling, the practical position typically is to take a defensible percentage assumption for architects (often in the 6 per cent to 10 per cent range for full-service developer engagements) and a defensible fixed-fee assumption for building designers, then sensitivity-test both against likely scope-creep scenarios. With Feasly’s feasibility software, you can model multiple design fee scenarios alongside construction cost movement and overlay the impact on residual land value and IRR. Treating design fees as a static line item underestimates the importance of which model is chosen and how it behaves under stress.

Project Type Decision Matrix

The most useful way to think about practitioner selection is to start from the project, not from the practitioner. The matrix below is a starting framework, not a hard rule.

This is general guidance. There are excellent building designers operating well beyond what this matrix suggests, particularly in jurisdictions with mature designer licensing (Victoria, Queensland medium-rise and open). There are also small developments where an architect’s scope is overkill and a fixed-fee building designer engagement is the better commercial outcome.

Design and Construct, Novation, and Risk Transfer

For larger developer projects, the procurement model often determines as much about design risk as the practitioner choice itself. Design and construct (D&C) and its close relative design, novate, and construct (DNC) are common in Australian developer practice and have substantial implications for who carries design risk and how design fees are accounted for.

Traditional construct-only procurement

In traditional procurement, the developer engages the design team (architect, engineers, consultants) directly. The design team produces fully resolved documents. The developer then tenders the documents to builders on a construct-only basis. Design risk sits with the developer (subject to the design team’s PI cover); construction risk sits with the builder. Variations during construction are negotiated through the contract administrator (commonly the architect).

This model gives the developer maximum design control but exposes the developer to design coordination risk. If the documents are deficient and the builder picks the deficiencies up at tender or during construction, the developer typically wears the cost.

Design and Construct (D&C)

Under a D&C contract, the developer engages a builder to both complete the design and undertake construction, typically working from a brief and concept design rather than fully resolved construction documents. The builder takes on design responsibility and engages (or absorbs) the design team. The developer’s commercial position improves on certainty (a single point of responsibility) but typically weakens on design quality (the builder optimises for buildability and margin).

Design, Novate, and Construct (DNC)

The DNC variation is increasingly the preferred approach for larger Australian developments. The developer engages the design team directly through schematic and design development phases — far enough that the building is defined but not so far that it is fully documented. The developer then tenders to builders, and at award, the design team is novated to the successful builder. The design team continues to deliver the documentation but now under the builder’s contract.

The Australian Institute of Architects has published guidance on novation, noting that it remains a common law mechanism with limited statutory framework. From a developer’s perspective, DNC offers the design quality advantages of selecting and briefing your own design team while transferring the integration risk to the builder once construction certainty is needed.

The practitioner choice here matters. Architects are generally more accustomed to novation arrangements than building designers — the AIA and ACA produce significant guidance on the mechanics, common pitfalls, and contractual protections that architects use under novated arrangements. A building designer with novation experience can certainly operate in the model, but it is worth checking that they have done so before, particularly on developer-scale projects.

Professional Indemnity Insurance and Risk

Professional indemnity insurance is one of the quieter but more important differences between practitioner types.

For registered architects, current PI cover is a statutory condition of registration. The minimum cover level is set by state registration boards. If a design error causes loss — incorrect specification, missed code requirement, coordination failure — the developer has an insured party to claim against, typically up to the policy limit.

For building designers, PI cover is mandatory in some states (Victoria, Queensland) as a condition of registration and voluntary in others. Where it is mandatory, the regulator effectively guarantees a floor on the designer’s insurance position. Where it is voluntary, the developer needs to verify it directly. BDAA accreditation requires current PI cover, so accredited members will hold it; non-accredited designers in unregulated states may not.

The level of cover matters as well. A designer with one million in PI cover working on a fifteen million development is materially under-insured from the developer’s perspective. For larger projects, requesting a certificate of currency and confirming the level of cover is a basic prudential step.

Where the project is procured D&C or DNC, the design risk is contractually transferred to the builder. The builder’s insurance position then becomes the developer’s relevant exposure, but the underlying designer PI is still a useful backstop if the builder itself fails — a more common scenario than developers tend to assume in current market conditions.

How to Engage the Right Practitioner

Once the practitioner type is selected in principle, the actual engagement is its own discipline. A structured selection process typically protects against the more common procurement mistakes.

Define the scope precisely. Set out exactly what you need: schematic, design development, documentation, contract administration, post-occupancy inspections. Both architect and building designer engagements vary enormously based on what is in or out of scope. Comparing fees without comparing scope is comparing different products.

Confirm registration and accreditation. Verify architects on the state Architects Registration Board register; verify building designers on the relevant state register (VBA / BPC in Victoria, QBCC in Queensland, CBOS in Tasmania, etc.); confirm BDAA accreditation where the project is under the NSW Low Rise Housing Diversity Code or analogous codes.

Request and verify PI insurance. Ask for a certificate of currency. Check the level of cover against the project value. If the level is light, consider whether to require a project-specific top-up or accept the exposure consciously.

Reference-check on developer-scale work. Many designers operate well at single-house scale but struggle with the coordination and contractual rhythm of multi-unit developer projects. Speak to two or three past developer clients before signing.

Pre-agree the variation regime. Lump-sum and fixed-fee structures only work if both parties understand what triggers a variation and how variations are priced. Pre-agreement reduces friction later.

Consider the design team as a system. Architect and building designer engagements both sit within a broader design team — engineers, surveyors, landscape architects, planners, sustainability consultants, town planners. The lead consultant’s ability to coordinate the team is often more important than their individual design output.

With Feasly’s feasibility software, you can budget design fees as a sensitivity-tested line item — modelling a base case alongside contingency for variations, scope creep, and procurement-related design changes — rather than treating the design fee as a fixed input. The differences between an architect percentage fee and a building designer fixed fee become visible at the residual land value and IRR level.

Common Pitfalls in Practitioner Selection

Several mistakes recur in developer practice, and most are avoidable.

Engaging an architect when a competent building designer would have done the job. For straightforward single-house and small-residential work in non-complex zones, an architect engagement at 8 per cent of construction cost can represent significant fee savings foregone. This is not a comment on quality — it is a comment on fit-for-purpose engagement.

Engaging a building designer for a job that legally requires an architect (or BDAA-accredited designer). The reverse mistake. The most common version is engaging a non-accredited building designer for a NSW dual occupancy intended for the Low Rise Housing Diversity Code complying development pathway, then discovering at certification that the Design Verification Statement cannot be signed. Project then falls into the longer DA pathway, often with a holding cost penalty measured in months.

Failing to verify designer registration in regulated states. Plans prepared by an unregistered designer in Victoria, Queensland, or Tasmania may compromise the validity of the building permit and the developer’s insurance position. The verification step takes minutes.

Mismatching designer scope with the project’s actual needs. A building designer engaged for “DA-ready drawings only” cannot also be expected to administer the construction contract or supervise the builder. Adding scope mid-project is more expensive than scoping correctly at engagement.

Ignoring the novation question for D&C / DNC procurement. If the project will be procured DNC, the design team must be selected with that in mind. Architects accustomed to novation operate efficiently under the model; designers without novation experience often struggle when the consultant relationship transfers to the builder.

Treating design fees as fixed in feasibility analysis. Design fees are rarely the largest single line item but they sit between roughly 3 per cent and 10 per cent of construction cost — material enough to swing a marginal feasibility outcome. Modelling them as a static input misses the sensitivity meaningfully.

Frequently Asked Questions

Is a building designer always cheaper than an architect?

Not necessarily. The comparison depends on scope. A building designer engaged for documentation-only at a fixed fee may indeed cost less than a full-service architect appointment. A building designer engaged for full service (concept through contract administration through defects) often lands closer to an architect’s fee, particularly for larger or more complex projects. Comparing fees requires comparing scope.

Can a building designer prepare plans for a five-storey apartment building?

It depends on the state and the designer’s specific licensing. In Queensland, a QBCC medium-rise or open licensed building designer can lawfully prepare such documents. In NSW, the designer must be registered under the DBP Act 2020 for Class 2 work, which applies equally to architects and building designers. In states without designer licensing (SA, WA), the practical answer turns on demonstrated capability and PI position rather than statutory authority. As a developer, the more conservative path on apartment work is engagement of a registered architect with relevant experience.

Does engaging an architect improve council outcomes?

In some contexts, yes. Where the project sits within a heritage conservation area, on a complex site, or under an apartment design code requiring design verification, architect engagement may streamline the planning process or unlock pathways unavailable to non-accredited designers. For routine developments in low-complexity zones, the practical effect on council acceptance is typically modest and the fee differential may not be justified on planning-pathway grounds alone.

Can I switch from a building designer to an architect mid-project?

Practically yes, but it is rarely efficient. The architect would typically need to review, validate, and potentially redo the prior design work, with cost implications and project programme implications. The more common scenario is to retain a building designer for documentation and engage an architect as design reviewer or quality consultant — a more cost-effective collaboration than mid-project substitution.

Are draftspersons the same as building designers?

The terms are sometimes used interchangeably but they are not equivalent. Draftspersons typically focus on producing plans from a defined design — they execute documentation rather than design strategy. Building designers, particularly registered building designers in Victoria, Queensland, and Tasmania, undertake the design itself in addition to documentation. For developer work, the distinction matters because design decisions drive feasibility outcomes, and a drafting-only engagement leaves those decisions with the developer.

What is the most common practitioner choice for Australian developers?

There is no single most common choice — it varies dramatically by project type and state. Anecdotally, registered building designers handle the bulk of low-rise residential developer work (single houses, dual occupancies, smaller townhouse projects), particularly in Victoria and Queensland where the licensing regime supports it. Architects dominate Class 2 apartment work, mixed-use, build-to-rent, and any project where design quality directly drives sales price or operating yield. Many active developers maintain relationships with both, choosing the practitioner type by project rather than running every project through the same designer.

Bringing It Together

The architect versus building designer question is best answered project by project rather than as a blanket developer policy. The legal framework, the state registration regime, the specific code overlays applying to the proposed development, the procurement model, the design risk position, and the fee sensitivity at the project’s actual scale are all variables that may tilt the answer differently each time.

For most low-rise single-house and small multi-unit developer work — single houses, duplexes, four-pack townhouses, walk-up small apartment buildings under three storeys — an appropriately registered or accredited building designer is typically a sound commercial choice, particularly in Victoria, Queensland, and Tasmania where the regulated environment supports the engagement and where state licensing classes are well-matched to building scale.

For most Class 2 apartment work, mixed-use developments with a Class 2 component, build-to-rent, heritage-sensitive projects, sites of high planning complexity, and projects where sales price or operating yield is strongly driven by design quality, a registered architect is typically the better fit. The additional fee — often two to five per cent of construction cost over a building designer fixed-fee equivalent — frequently buys design coordination, code expertise, and contract administration capacity that recovers the differential many times over in completed-project outcomes.

For NSW developments under the Low Rise Housing Diversity Code, the practical choice narrows to a registered architect or a BDAA-accredited building designer. For NSW Class 2 work, all designers — architects included — must hold DBP Act 2020 registration as a design practitioner. These are statutory rather than commercial decisions; the question is which of the two qualified options best fits the brief and budget.

Whichever direction the project goes, the practical disciplines are the same: define scope precisely, verify registration and accreditation, confirm PI insurance cover, reference-check on developer-scale work, agree the variation regime before signing, and sensitivity-test the design fee within feasibility modelling rather than treating it as a static line. The cost of getting this wrong is rarely catastrophic on any single project, but compounded across a development pipeline it is material.

The right designer is the one whose scope, accreditation, registration, fee structure, and developer experience map cleanly to what the project actually needs. There is no universal answer — and the developers who consistently win the design selection question are the ones who treat it as a structured procurement decision rather than a defaulted relationship.