How the fee is structured affects what you get and what the architect is incentivised to do. Two common approaches compared.
Design fees are negotiated quickly and shape the relationship for the length of the project. The structure matters as much as the amount, because it determines what is included, what triggers additional charges and where the incentives sit.
Percentage of construction cost at a glance
The fee is a percentage of the eventual construction cost, adjusting as the project scope and cost develop.
Fixed fee for a defined scope at a glance
A stated fee for a defined set of deliverables, with additional work charged separately under agreed rates.
Cost certainty
Percentage of construction cost: None until construction cost is known, which is after design is complete.
Fixed fee for a defined scope: Complete for the defined scope, with additional work priced separately.
Incentive alignment
Percentage of construction cost: The fee rises with construction cost, which is worth acknowledging even where it does not affect behaviour.
Fixed fee for a defined scope: Neutral on cost, with the incentive being to complete the defined scope efficiently.
Clarity of deliverables
Percentage of construction cost: Often described by stage rather than by document, which can create ambiguity later.
Fixed fee for a defined scope: Usually itemised, which makes it clear what you are buying.
Handling of changes
Percentage of construction cost: Absorbed into the percentage up to a point, with major changes usually charged additionally.
Fixed fee for a defined scope: Charged as additional services, which makes the cost of changes visible.
Comparability between offers
Percentage of construction cost: Difficult, since percentages apply to an unknown figure.
Fixed fee for a defined scope: Straightforward, provided each offer lists the same deliverables.
When percentage of construction cost wins
- The scope cannot yet be pinned down at appointment.
- The project is likely to evolve substantially during design.
- You want the fee to scale with the work involved.
- The arrangement is conventional for the project type and understood by both sides.
When fixed fee for a defined scope wins
- The scope can be defined with reasonable precision.
- You want cost certainty for budgeting.
- You want the deliverables listed explicitly.
- You are comparing offers from several architects.
How to decide
Use a fixed fee where the scope can be defined, because it produces comparable offers and clear deliverables. Use a percentage where the project is still taking shape, and agree a cap or a review point so the fee cannot expand without limit.
Whichever structure you choose, require a deliverables schedule: which drawings, at what stage, how many revisions, and what constitutes an additional service. Fee disputes almost always concern scope rather than rate.
If you are starting a design, Domira can help you write the brief, review the drawings and keep the design aligned with the budget before it reaches a contractor.
Frequently Asked Questions
What should the design fee include?
Typically concept design, developed design, the drawings required for permitting and the documentation needed for tender, with the exact list depending on the appointment. Supervision during construction is usually a separate service with its own fee.
How many revisions should be included?
A reasonable number at each stage should be stated explicitly, because unlimited revision is not sustainable for the architect and unspecified revision leads to disputes. A defined number, with additional rounds charged at an agreed rate, works for both sides.
Is the cheapest design fee ever the right choice?
Only if the deliverables are equivalent, which they frequently are not. Design fees are a small proportion of total project cost and have a disproportionate effect on both construction cost and the quality of the result, which makes them a poor place to economise.
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