PRICING · THREE HAT BUILDINGS
Architecture & Design Fees²
Rates last reviewed Match 2026
Full architectural service for a custom home in Melbourne typically falls between 8% and 15% of your construction cost. Here is what that range covers, why it varies, and how the fee maps to the actual work across a project.
FULL ARCHITECTURAL SERVICE
8% – 15%
of estimated construction cost
EXAMPLE: $1.0M CONSTRUCTION COST
$80k – $150k
Architectural fee range
Why does the range vary so much?
The fee reflects the complexity and duration of the work — not just the size of the project. A straightforward renovation on a flat site with a clear brief sits toward the lower end. A complex new build on a difficult site with an extended construction period sits toward the upper end.
The things that most commonly push fees upward:
Site complexity — difficult access, significant slope, or heritage constraints extend every stage of the process
Brief complexity — the more specific the requirements, the more work goes into resolving them well before anything is built
Construction period — longer builds require more site visits, more coordination, and more decisions made under pressure
Project type — renovations often involve more unknowns than new builds, which adds time at every stage
One of the most common mistakes early in a project is treating the fee as a negotiating target before the scope is understood. The number makes more sense — and is easier to evaluate honestly — once you know what the project actually requires.
How the fee maps to the work.
Whether you pay a percentage, a fixed fee, or an hourly rate, understanding how a project is staged is the most useful thing you can do before signing anything. Each phase has a distinct purpose. Knowing where you are in the sequence means you can make better decisions at every step — including whether to continue.
| Concept Phase | Stage 1 — Predesign Stage 2 — Concept Design |
| Design Development | Stage 3 — 3D Modelling Stage 4 — Specifications Stage 5 — Design Development Package |
| Pre-Build Phase | Stage 6 — Construction Documents Stage 7 — Construction Pricing & Contracts Stage 8 — Building Permit |
| Build | Stage 9 — Construction Stage 10 — Post Construction |
Each stage is distinct with no obligation to continue to the next. At completion you hold a licence to use the design to build on your site — which means you can approach multiple builders, compare quotes on equal terms, and choose the right one for the job.
A building project is a sequence of decisions made under uncertainty. The fee covers the quality of judgement applied at each stage — not just the drawings produced at the end.
Why fees are structured differently
Different fee structures suit different levels of certainty. The right one depends on how well-defined your project is at the point you engage.
Percentage Fee
The most common structure for full service. Works well before the full scope is known — the fee adjusts naturally as the project is resolved. The architect works with you from start to finish.
Fixed Fee
Requires a clearly defined scope before work begins. Carries more risk from the architect's side, so is typically priced to reflect that. Best suited to well-defined projects with fixed briefs.
Hourly Rate
Used for smaller projects, advice outside standard scope, or early consultation before a project is committed — including the Second Opinion service.
Should I hire an architect or a builder first?
For most custom residential projects, the design should be resolved before builders are asked to price it. A builder cannot price what has not been designed — and going to a builder early typically means committing to a direction before you have had the chance to explore whether it is the right one.
The cleaner sequence: clarify your brief, engage an architect to translate it into a design, then take that design to builders for pricing. This keeps your options open at every stage — and means the design serves your brief, not a builder's preferences or standard methodology.
THE KEY DISTINCTION
When you engage an architect, you own the design. That licence means you can approach multiple builders, compare quotes on equal terms, and make a genuinely informed decision about who constructs your home.
When a builder designs your home, the design typically belongs to them — which limits your options considerably when it comes time to price the work.
What does an architect actually do during construction?
This is the part of the fee most people underestimate — and where much of the real value sits.
During construction, the role shifts from designing to holding the line. That means:
Site visits — checking that what is being built matches what was documented, catching discrepancies before they become expensive to fix
Responding to builder queries — conditions the drawings could not anticipate get resolved in real time, with knowledge of the original intent intact
Reviewing variations — assessing whether builder-proposed changes are reasonable, necessary, and fairly priced
Progress claims — reviewing payment claims against actual progress before they are approved
End of construction review — a thorough check of the completed work before the final payment is released
The cheapest consultant at the start of a project can become the most expensive one by the end if coordination breaks down, documentation is incomplete, or nobody is reviewing variations with enough knowledge of what was originally intended.
The same person who made the early decisions is still there when the builder starts asking difficult questions. That continuity is rarer than it should be — and it is where most projects either hold together or quietly come apart.
Do I need a registered architect?
Not always. The right choice depends on the complexity of your project, your budget, and how much design resolution the brief actually requires.
Registered architects bring a depth of training in resolving complex problems — site constraints, structural coordination, material performance, long-term liveability — that shapes how decisions get made well before anything is drawn. That training matters most when the project is complicated, the site is difficult, or the brief needs careful resolution over time.
Building designers and draftspeople are a legitimate alternative for simpler projects or tighter budgets. Often faster and less expensive. The trade-off is typically in the depth of design thinking and the level of construction-phase involvement.
A practical guide:
Construction cost under $500,000, straightforward site, clear brief — a building designer may be the right fit
Construction cost above $500,000, complex site, or a brief that needs careful resolution — a registered architect is likely worth the fee
Uncertain which applies to your project — a Second Opinion is a low-cost way to get that question answered before committing either way
The same person who made the early decisions is still there when the builder starts asking difficult questions. That continuity is rarer than it should be — and it is where most projects either hold together or quietly come apart.