Building Design Quotes: What Should Be Included?

A building design quote can look straightforward until you compare two proposals for the same renovation, granny flat or new home. One may appear significantly cheaper, but only cover an early concept. Another may include detailed plans, coordination and approval documentation that prevents costly gaps later. The right building design quotes make it clear what you are buying, what sits outside the scope, and what is needed to move towards approval and construction.

For homeowners and small developers across NSW, the key question is not simply, “What is the design fee?” It is, “What work will be completed before I need to engage the next consultant, submit an application or ask a builder to price the job?”

Why building design quotes vary so much

No two sites, briefs or approval pathways are identical. A single-storey rear addition on a level block may require a very different level of investigation and documentation to a duplex on a constrained site, a granny flat near a flood-prone area, or a café fit-out in an existing tenancy.

The quote may also reflect the pathway proposed. Some projects are suited to a Complying Development Certificate (CDC), while others require a Council Development Application (DA). A CDC can be efficient where the proposal and site meet the relevant standards, but it is not available for every property or design. A DA can allow more flexibility, although it usually involves more planning assessment and a longer approval process.

A lower quote is not automatically poor value, and a higher quote is not automatically comprehensive. The useful comparison is scope against scope. If one designer includes a detailed site review, 3D presentation, DA plans and consultant coordination while another provides only floor plans, they are not quoting for the same service.

What a clear building design quote should cover

A professional quote should describe the project, the design stages, the deliverables and the exclusions in plain English. It should also identify the assumptions used to prepare the fee. This gives you a proper basis for deciding whether the service matches your project rather than comparing a single bottom-line figure.

Project brief and site review

The process should begin with the basics: the property address, intended use, estimated size or accommodation requirements, and the type of work proposed. For example, a quote for a new two-bedroom granny flat should not be treated as interchangeable with one for an attached secondary dwelling above a garage.

The site review may involve assessing available survey information, orientation, access, slope, existing structures, neighbouring development and obvious planning controls. At an early stage, this work identifies practical constraints such as setbacks, height limits, heritage considerations, bushfire risk, flooding, easements or stormwater challenges.

Not every issue can be resolved from an initial review. Specialist reports may be required, particularly on complex sites. A good quote will state whether preliminary planning advice is included and whether further investigations are likely to be needed.

Concept design and revisions

Concept design is where your ideas are turned into workable options. Depending on the agreed scope, this can include floor plans, elevations, site layout and 3D views. It is the stage where decisions about room sizes, circulation, privacy, sunlight, storage, outdoor areas and the relationship to the existing dwelling need to be tested.

Check how many concept revisions are included. Design is an iterative process, but unlimited changes are rarely practical or fair for either party. A clear allowance for revisions gives you room to refine the brief while setting a sensible point at which major changes become additional work.

This is particularly relevant when several family members or business partners are involved. If the brief continues changing after a preferred design has been developed, the approval documentation may need to be revised too. That affects both timing and cost.

Approval documentation

Many clients assume a set of plans is automatically ready for council or a certifier. Often, it is not. Approval-ready documentation requires a coordinated package prepared for the applicable pathway.

For a DA, this commonly includes site plans, floor plans, elevations, sections, demolition plans where required, shadow diagrams or other supporting drawings, and a planning-focused design statement. The exact requirements depend on the council, the project and the site.

For a CDC, the documentation must demonstrate compliance with the relevant development standards and be supported by information required by the certifier. A design that looks simple can still fail to qualify if setbacks, site coverage, height, landscaping or other controls are not met.

Ask the designer to specify whether the quoted drawings are for concept presentation, DA or CDC submission, or construction certificate-related documentation. These are distinct stages with different levels of detail.

Consultant requirements and coordination

Building design does not replace every specialist discipline. Your project may need a registered surveyor, structural engineer, geotechnical engineer, BASIX assessor, private certifier, bushfire consultant, hydraulic engineer, arborist, acoustic consultant or town planner. Commercial work can introduce further requirements relating to access, fire safety, food premises or fit-out approvals.

A well-prepared quote should identify likely consultants and explain whether their fees are included, excluded or allowed for separately. Consultant fees are commonly separate because their scope depends on the findings, site conditions and authority requirements.

Coordination is also worth clarifying. There is a meaningful difference between receiving a list of consultants to contact and having your building designer incorporate engineering information, respond to drawing queries and coordinate changes across the documentation set. For a straightforward job, limited coordination may be enough. For a more involved development, it can save considerable time and reduce inconsistencies between plans.

Compare scope, not just the total fee

When reviewing building design quotes, place them side by side and compare the practical outputs. Four areas are especially useful to check:

• the exact drawings and documents supplied at each stage

• the approval pathway assumed and whether planning advice is included

• the number of meetings and revision rounds allowed for

• consultant fees, council fees, certifier fees and other exclusions.

Also look at the proposed programme. A fast initial concept is helpful, but it does not guarantee a fast approval. Council assessment time, consultant availability, requests for information and changes to the brief can all affect the overall timeline. A realistic programme acknowledges these dependencies rather than promising certainty where it cannot be controlled.

Be cautious of vague wording such as “plans as required” or “approval assistance” without a schedule of deliverables. That language can create different expectations once the work is underway. Specificity protects the client and gives the design team a clear framework for delivering the work properly.

Questions to ask before accepting a quote

Before appointing a building designer, ask what level of documentation is included and what stage it will take you to. If a DA is needed, ask whether the fee includes the full DA drawing package and responses to ordinary council requests for clarification. If a CDC is proposed, ask what preliminary checks have been made to confirm that pathway is realistic.

It is also sensible to ask how site constraints will be handled. A designer with local NSW approval experience can flag issues early, but no responsible professional should guarantee an approval before the relevant authority or certifier has assessed the complete application.

Clarify what happens if you change the size, layout, budget or use of the project. A modest adjustment at concept stage may be included in the revision allowance. Moving walls after engineering is complete, adding a second storey, or changing a garage into a secondary dwelling can alter the scope substantially.

Finally, consider experience with the type of project you are planning. A designer who regularly prepares approvals for additions, granny flats, duplexes or small commercial projects is more likely to understand the documentation, coordination and planning detail that commonly affects those jobs.

The cheapest quote can become the expensive option

An incomplete scope can create false savings. If essential plans, reports or coordination are excluded without being understood, you may need to engage extra services later under time pressure. Builders may also price more cautiously when drawings lack detail, because uncertainty becomes a cost risk.

That does not mean every project needs the most extensive package available. A modest deck or simple internal alteration may need far less documentation than a new dwelling. The right level of service depends on the project, the site, the approval pathway and the confidence you need before committing to construction.

At GAP Designers, the focus is on defining a practical design and approval pathway before the paperwork becomes a problem. A clear quote gives you more than a fee to accept. It gives you a workable starting point for decisions that will shape your budget, approval process and build outcome.