Hiring an interior architect in Paris quickly raises a central question: how is the fee actually worked out? Contrary to a common assumption, there is no single fee scale or regulatory standard setting a fixed price. Each practice defines its own billing method, depending on the nature of the brief, the scale of the project and the level of support offered. Understanding these mechanisms makes it possible to approach a renovation or fit-out project with a clear budget picture, and to avoid unpleasant surprises between the first meeting and the completion of the works.
Percentage of the works cost
This is the profession's historical billing method, still widely used in Paris today. The interior architect applies a rate, generally between 8% and 15%, calculated on the total cost of the works excluding furniture or excluding tax depending on the practice. This rate varies according to the technical complexity of the site, the floor area involved and the intended level of finish.
This method of calculation follows an interesting logic: it aligns the architect's interest with the client's. A more ambitious project, requiring more coordination and supervision, naturally generates proportionally higher fees — without encouraging the architect to artificially inflate the works budget, since their reputation ultimately depends on the quality of the finished result.
The fixed fee
For briefs with a clearly defined scope — designing a floor plan, defining a material palette, support on a specific room — many practices now offer a fixed fee, agreed in advance based on the floor area and the exact nature of the service.
The main advantage of this billing method lies in its predictability: the client knows the exact amount from the moment of signing, regardless of how the works budget evolves during the project. It is a particularly suitable option for projects whose scope is clearly identifiable from the outset.
Hourly rate and price per square metre
Some one-off briefs don't justify billing by percentage or fixed fee: advice on an existing plan, a technical review, limited-time support. In these cases, hourly billing — generally between €80 and €150 in Paris depending on the professional's experience — offers flexibility suited to narrowly defined needs.
Rarer, pricing per square metre mainly applies to large-scale projects, where a rate is set per square metre fitted out, generally between €100 and €300/m² depending on the level of service. It allows for a quick estimate from the earliest sketches, even before a detailed costing of the works is available.
The factors that make fees vary
Beyond the chosen billing method, several parameters directly influence the level of fees. The nature and complexity of the property play a decisive role: a Haussmann-era apartment with mouldings to preserve, a loft requiring a complete restructuring, or a duplex involving the creation of a staircase do not call for the same level of technical involvement.
The scope of the brief also matters: simple design advice is nothing like a full brief combining design, material selection, coordination of tradespeople and site supervision through to completion. The desired level of finish also affects the fee — between a functional renovation and a high-end bespoke project, the difference in design time, and therefore in fees, can be significant.
The specific constraints of a Parisian property finally weigh into the balance: a co-ownership with strict regulations, a listed building or one located in a protected area, difficult access for tradespeople — all factors that extend the time needed to manage the project. An architect's experience and reputation are also reflected, as in any creative profession, in their fee scale.
What fees generally cover
A full interior architecture brief usually includes several components, which are essential to clarify before signing: the design phase, including floor plans and initial sketches; the choice of materials, finishes and furniture, with a specification book drawn up; coordination of tradespeople and management of the site schedule; the necessary administrative steps, particularly with the building manager or for certain planning approvals; and follow-through to completion, generally including a defined number of site visits.
This scope varies considerably from one practice to another: some include unlimited plan revisions, others charge for each change beyond a defined threshold. This is precisely why a careful reading of the quote is essential before any commitment.
How to evaluate an interior architect's quote
Before committing, several checks help avoid misunderstandings later on. First, clarify the exact scope of the brief — design only, or design combined with full site supervision — then ask for the details of how fees are calculated, and the basis on which they apply (works cost excl. or incl. VAT, furniture included or not).
It is also essential to identify what is included in the fixed fee or rate applied — number of site visits, meetings, revised sets of plans — and to compare several proposals on a strictly equivalent scope, rather than on the headline amount alone.
How we set our fees at Supra Studio
At Supra Studio, every quote is drawn up on a bespoke basis, after an initial visit to the property and an in-depth discussion of the project's expectations. We systematically detail the exact scope of our brief — design, material selection, site coordination — as well as the billing method used, so that every client has a clear budget picture from the very start of the project.
Planning a renovation or interior fit-out project in Paris? Book an appointment for an initial conversation, or get in touch for a personalised quote.
Frequently asked questions
What is the average percentage applied by an interior architect in Paris? The rate is generally between 8% and 15% of the works cost, depending on the complexity of the project and the level of service. This rate should always be specified in writing in the quote, along with the exact basis of calculation (excl. or incl. VAT, furniture included or not). For detailed budget ranges by project type, see our article on interior architect fees per m² in Paris.
Is an interior architect's quote free? This depends on each practice: some offer a free initial discovery meeting, others charge for a feasibility study upfront, particularly for complex projects requiring an in-depth technical visit. It is recommended to clarify this point from the first contact.
Can an interior architect's fees be negotiated? The amount depends above all on the scope of the brief rather than simple price negotiation. It is, however, entirely possible to adjust the scope entrusted — for example by limiting the brief to design without site supervision — to adapt the overall amount to the available budget.
Should extra budget be planned for during the project? Depending on the billing method chosen, a change in the works budget during the project can affect fees calculated by percentage. This is why it is essential to set a realistic works budget from the outset, including a margin for unforeseen costs, in order to anticipate the impact on the final fee amount.
