How do architect fees and scope work for a heritage renovation?

Answering: How do architect fees and scope work for a significant heritage renovation in Melbourne?

Estimated reading time: 9 min read

The fee you’re quoted and the fee you actually pay are often two different numbers, and the gap between them is almost always scope, not price. Architect fees in Victoria are charged one of three ways: a percentage of construction cost, a fixed lump sum, or an hourly rate, and there is no standard or recommended fee scale, so each practice sets its own. Scope is the more important half of the question: a clear engagement defines which work stages your fee covers (feasibility, concept design, design development, documentation, contract administration), what it excludes (a quantity surveyor, a heritage consultant, an engineer), and how variations are priced. In Victoria a written client-architect agreement that sets this out is mandatory. At BY Projects Architecture we quote heritage projects on a fixed-fee basis with a defined scope, so the number you agree at the start is the number that holds.

You’re about to hand someone a significant brief on a building you care about, and the part that keeps you up is not the design, it’s the dread of an open-ended invoice, a quote that quietly grows, and a scope so vague you only discover what it didn’t include when the bill arrives.

That fear is reasonable. A heritage renovation can run for a year or more, touch several other consultants, and meet surprises in a wall that no one could see on day one. When scope is loose, every one of those moments becomes a negotiation. When it’s clear, they become a line you already understood.

This is the part of a project we settle before the first line is drawn, so the path and the budget are real. Here is how fees and scope actually fit together.

Key Insights

• Architects charge three main ways: a percentage of construction cost, a fixed lump sum, or an hourly rate. There is no standard or recommended fee scale in Australia.
• A fee number only means something against a defined scope: which work stages it covers, what it excludes, and how variations are priced.
• In Victoria a written client-architect agreement is mandatory, and poorly scoped agreements are a common thread in complaints to the regulator.
• Some specialist work, a quantity surveyor or a heritage consultant, sits outside the architect’s fee and should be named in the engagement, not discovered later.

Keep reading for full details below.

Table of Contents

• The Three Ways Architects Charge, and What Each One Hides
• What Scope Actually Means: the Work Stages Your Fee Buys
• What Sits Outside the Architect’s Fee
• Why a Clear Agreement Is Your Best Cost Control

The Three Ways Architects Charge, and What Each One Hides

Australian architects use three main fee structures, and each behaves differently when a heritage project meets a surprise.

The Australian Institute of Architects is direct about the starting point: architects’ fees “are a matter for negotiation: there is no standard basis for calculation,” and the fee will reflect the degree of personal service and the complexity of the project. The recommended fee scale that practices once used was withdrawn decades ago on competition grounds, so any figure you’re quoted is that practice’s own, not an industry rate.

• Percentage of construction cost. The fee is a percentage of what the building costs to construct. It’s simple to state, but it moves with the build: if construction cost rises, so does the fee, and on a heritage project where a wall opens up to reveal a surprise, the cost can rise more than once.
• Fixed lump sum. The architect agrees a set fee for an agreed scope. Its advantage, in the Institute’s own words, is that the client “always knows exactly how much the architect’s fee will be.” It depends entirely on the scope being defined properly, which is where the real work sits.
• Hourly rate. The architect bills time at an agreed rate. It suits genuinely open-ended or investigative work, but for a whole renovation it offers the least certainty, because the total is unknown until the work is done.

We quote significant heritage projects on a fixed-fee basis with a clearly defined scope, so the number you agree at the outset is the number that holds. Fixed-fee certainty only works when the scope behind it is honest, which is exactly why we spend the feasibility stage getting the scope right before we name the fee. Across 35-plus years and more than 200 permit applications, that discipline is what keeps the quote and the invoice the same number.

What Scope Actually Means: the Work Stages Your Fee Buys

A fee is meaningless until you know which stages of work it covers, because “an architect” can mean anything from a concept sketch to full oversight of a year-long build.

The Institute describes the core architectural services as concept design, design development, documentation and contract administration, with a feasibility phase ahead of them. On a heritage project they run roughly like this:

• Feasibility reconciles your vision with the site’s realities: the Heritage Overlay, council expectations, and an honest order-of-cost view, before money goes into design.
• Concept design resolves the idea, how the home reads in its streetscape and works within the overlay, as plans and form rather than final detail.
• Design development takes that concept and coordinates the engineers and consultants, and builds the planning and heritage response the council will assess.
• Documentation produces the construction drawings and specification your building surveyor and builder rely on.
• Contract administration is the architect acting for you during the build, reviewing progress claims, assessing variations, and holding the design intent as the home is constructed.

The trap is the partial engagement. An architect may be engaged for some stages and not others, and a quote that covers concept and documentation but stops before contract administration is a smaller number that leaves you alone for the riskiest part: the build. Neither is wrong, but you should know which one you’re buying. This is also where full-cycle oversight earns its place. When the same practice that designed to the overlay also administers the contract, the design intent that won the permit is the design intent that gets built, rather than quietly value-engineered away on site.

What Sits Outside the Architect’s Fee

Some of the most important people on a heritage project are not the architect, and their fees usually sit outside the architect’s, which is a common source of “hidden” costs that were never actually hidden, just unstated.

On a significant heritage renovation you may need:

• A quantity surveyor (QS) for an independent cost plan, a pre-tender estimate, or to assess contested variations during construction, particularly valuable on a larger budget where the order of cost needs to be tested rather than assumed.
• A heritage consultant where the listing is contested or the council wants a Statement of Significance or a heritage impact assessment to support the application.
• A structural or services engineer, a land surveyor, a building surveyor for the building permit, and council and lodgement fees.

The question to ask is not “do I need these?” but “are they inside or outside the fee I’ve been quoted, and who manages them?” A well-scoped engagement names them. The architect typically coordinates these consultants as part of design development and documentation, but their professional fees are usually the owner’s to carry directly. Knowing this on day one is the difference between a budget that holds and a series of unwelcome additions. We map the likely consultant team in the feasibility stage, so the full picture, the architect’s fee and everything around it, is on the table before you commit.

Why a Clear Agreement Is Your Best Cost Control

The single most effective thing protecting your budget isn’t the fee model you choose, it’s the written agreement that defines it, and in Victoria that document is not optional.

The Architects Registration Board of Victoria (ARBV) is clear that a written client-architect agreement is required for the provision of architectural services, and it must set out the scope, nature and specific requirements of the services, how fees and costs are calculated, and how changes affect those fees. The regulator’s own complaints data tells the story: it has found that “the failure to properly scope the architectural services and client’s requirements in a client-architect agreement can have a significant adverse impact on project outcomes for the client,” and that “high-level, ambiguous agreements that fail to communicate the detail and specifics” are a recurring source of disputes.

Read plainly, that means the gap between your quote and your invoice usually opens up in a vague agreement, not a dishonest one. The fix is detail: a scope that lists the stages, an exclusions list that names what’s outside, and a variations clause that says how a change is priced and approved before it happens. That is precisely what a fixed-fee engagement with a defined scope is built to deliver, certainty by design, not by hope. The clearer the agreement at the start, the fewer the surprises at the end, which is the whole point of getting the scope right before the fee is set.

Closing

Making your quote and your invoice the same number comes down to two things: choosing a fee model whose certainty matches your appetite for risk, and insisting on a scope clear enough that nothing important is left unsaid. A fixed fee on a well-defined scope, with consultants named and variations priced in advance, is how a heritage renovation stays on the budget you agreed. To see how we set fees and scope before design begins, visit our process page.

Frequently Asked Questions

Q: How do architects charge for a heritage renovation in Melbourne?

A: One of three ways: a percentage of the construction cost, a fixed lump sum for an agreed scope, or an hourly rate. The Australian Institute of Architects notes there is no standard fee scale, so each practice sets its own and the figure reflects complexity and the level of service. We quote significant heritage projects on a fixed-fee basis with a defined scope, so the number you agree at the start is the one that holds.

Q: What’s the difference between a fixed fee and a percentage fee?

A: A fixed (lump-sum) fee is a set amount for an agreed scope, so you know the architect’s fee up front and it doesn’t move if construction costs rise. A percentage fee is calculated on the construction cost, so it moves with the build, which on a heritage project that meets structural surprises can mean the fee rises more than once. Fixed-fee certainty depends on the scope being defined properly at the outset.

Q: What costs sit outside the architect’s fee?

A: Commonly a quantity surveyor for cost planning, a heritage consultant for a Statement of Significance or impact report, structural and services engineers, a land surveyor, the building surveyor’s permit fees, and council lodgement fees. The architect usually coordinates these consultants, but their professional fees are typically the owner’s to carry. A well-scoped engagement names them so they’re never a surprise.

Q: Is a written agreement with an architect required in Victoria?

A: Yes. The Architects Registration Board of Victoria requires a written client-architect agreement for architectural services, setting out the scope, how fees and costs are calculated, and how changes affect them. The regulator has found that poorly scoped or absent agreements are a common thread in complaints, which is why a detailed scope and a clear variations clause are your strongest cost control.

Want to Learn More?

With more than 35 years on Melbourne’s heritage projects, BY Projects Architecture treats fee and scope as part of the design conversation, not the fine print at the end. The clearer the scope at the start, the truer the budget at the finish, and the home is built for living, not just photos.

Citations

• “Architects’ fees” — Australian Institute of Architects (Acumen). Confirms architects’ fees are a matter for negotiation with no standard basis for calculation, and describes the percentage, lump-sum and hourly fee methods. https://acumen.architecture.com.au/resources/client-information-notes/architects-fees
• “Core architectural services” — Australian Institute of Architects (Acumen). Sets out the core service stages, concept design, design development, documentation and contract administration, that define an architect’s scope of work. https://acumen.architecture.com.au/project/core-architectural-services
• “Client-architect relationships and agreements” — Architects Registration Board of Victoria. Confirms a written client-architect agreement is required in Victoria, must define scope and fees, and that poorly scoped agreements are a common source of complaints. https://www.arbv.vic.gov.au/systemic-risks-australian-architecture-sector/client-architect-relationships-and-agreements
• “Client-architect agreements (Guideline, Clause 4)” — Architects Registration Board of Victoria. The regulator’s guideline detailing what a compliant client-architect agreement must contain, including scope of services, fees and the management of variations. https://www.arbv.vic.gov.au/sites/default/files/2024-05/Client-architect-agreements_Clause-4_Final-2024.pdf

These are the Australian and Victorian sources that govern architectural fees and engagement: the Australian Institute of Architects on fee methods and core services, and the Architects Registration Board of Victoria on the mandatory written client-architect agreement.

With 35-plus years and more than 200 permit applications across Melbourne’s councils, our work is to turn an open-ended worry about cost into a fixed fee on a scope you can read, so your renovation starts on solid ground and your home is built for living, not just for the listing.

About the Author

Barbara Yerondais, FRAIA, is the founder of BY Projects Architecture. With 35+ years of experience, she specializes in sustainable, community-focused design and heritage restoration. A dedicated mentor and rower, Barbara balances her high-impact Melbourne practice with a passion for social inclusion and passive, energy-saving design.