Are you preparing a renovation and wondering how much the architect will cost? The difficulty is that there is no official pricing scale. Fees have been freely negotiated since 1986. Each quote is therefore unique, and two architects can propose very different amounts for the same renovation project. To avoid unpleasant surprises, it’s essential to understand how these fees are structured, what causes them to vary, and when they are truly justified during the project.
Why renovation fees exceed those for new construction
A common reflex is to search for an average percentage online and apply it to your renovation budget. The problem is that most published ranges mix new construction and renovation.
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In practice, renovation consistently costs more in fees than new construction. The indicative scales for 2026 confirm this: a complete renovation mission typically ranges from 12 to 18% of the pre-tax cost of the work, compared to 8 to 12% for new construction.
Why this gap? The architect working on an existing building must deal with constraints that new construction does not present. They conduct a survey of the existing structure, identify building pathologies, and adapt their design to the existing structures. When the site is occupied, coordination with contractors becomes more complex. And unforeseen issues (unidentified pipes, weakened floors, asbestos) create adjustments that increase the workload.
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If you estimate the cost of an architect for a renovation by applying a rate intended for new construction, you will almost certainly underestimate the actual budget.
Methods for calculating architect fees: which one suits your project
Before comparing quotes, you need to identify the billing method proposed. There are mainly three, and each suits a different type of project.
The percentage of the work amount
This is the most common formula in renovation. The architect charges a percentage of the final cost of the work excluding taxes. The advantage: their fees evolve with the actual scale of the project. The downside: if the work goes over budget, the architect’s bill does too.
The fixed fee
A total amount is defined upon signing the contract. You know exactly what you will pay, regardless of how the project unfolds. This formula is reassuring, but it assumes that the scope of the mission is very precise from the start. Any change in the program results in an amendment, which can sometimes be costly.
The hourly rate
Suitable for one-off missions: a consultation, an opinion on the feasibility of a project, assistance with a building permit application. You pay for the time spent, but without visibility on the total.
Have you noticed that architects rarely offer just one calculation method? That’s normal. A good professional adapts their pricing to the nature of your project. Always request a detailed quote with the calculation method clearly explained.
What really affects an architect’s renovation quote
Two renovations with the same budget can result in very different architect fees. Several factors explain these discrepancies, and knowing them allows you to negotiate better.
- The scope of the mission: a partial mission (design and plans) costs much less than a complete mission including site supervision until project completion.
- The technical complexity: renovating a Haussmann-style apartment with heritage constraints or working on a load-bearing structure requires more time than a simple interior refresh.
- The geographical location: fees vary significantly from one region to another, and architects working in densely populated urban areas often charge higher rates.
- The occupied nature of the site: coordinating a project in an occupied residence requires staggered work phases and additional logistics.
The more complex your project, the more the preliminary studies weigh in the quote. In a major renovation, the diagnostic and survey phase can represent a significant portion of the total fees.
Comparing architect quotes without making mistakes
Since there is no official scale governing the profession, the only reliable method remains competition. Request at least three quotes for the same project, ensuring that the described missions are comparable.
A serious architect’s quote should mention several specific elements:
- The exact scope of the mission (sketch, preliminary project, building permit, consultation with companies, site supervision, assistance with project completion).
- The chosen remuneration method and the calculation basis.
- The conditions for price revision in case of program changes.
- The expected timelines for each phase.
Compare the quotes phase by phase, not just on the total amount. An architect who appears cheaper may exclude site supervision, which will require you to manage the coordination of contractors yourself or pay a project manager additionally.
Negotiating without degrading the service
You can adjust the scope of the mission to reduce fees. For example, assign the architect the design and permit application, then handle the site supervision yourself if you have the experience. Reducing the mission is healthier than negotiating the rate down, as an underpaid architect will spend less time on your project.
The other concrete lever, often underestimated: an architect who rigorously puts contractors in competition can generate savings on work quotes that more than compensate for their own fees. On a well-managed site, structured competition significantly lowers gross quotes.
Before signing, check that the architect is registered with the Order and has up-to-date professional liability insurance. These two points are non-negotiable: they condition the legal validity of their mission and your protection in case of disputes.