Interior designer pricing: how to build a fee structure and stop subsidising projects

Pricing starts with scope, not with the number

The most common mistake in building a fee structure is starting from “what should I charge”. That question has no answer until you know what for. Two studios quoting the same rate per square metre can be selling completely different work: one includes three layout options and five site visits, the other one option and no visits. The client sees two identical numbers, picks on gut feel, and you end up funding the difference with your own time.

So a fee structure gets built in the opposite order to the one instinct suggests. First you write down what the client actually receives: which drawings, how many layout options, how many meetings, how many rounds of revisions, whether a product schedule is included, whether visuals are, whether you appear on site. Only against that list can you estimate time, and only from time a price. The list matters more than the figure, because the list is what settles later arguments.

A fee with no defined scope is not a price. It is an invitation to a negotiation you will lose halfway through the project.

Four fee models and what each one actually does

The choice of model is not a matter of taste. It is a decision about who carries the risk that the work turns out bigger than anyone assumed. On a rate per square metre that risk is yours. On an hourly rate it is the client's. Everything else sits between the two. The figure below puts the three most common models side by side, each with its cost attached.

In practice most studios do not pick one model, they combine them: the design on a fixed fee or per square metre, supervision and changes by the hour. That split has one large advantage. The client gets a predictable price for the predictable part, and you stop funding out of your own pocket the part that nobody could predict.

Why a rate per square metre punishes you on small flats

A 32 square metre studio flat has one kitchen, one bathroom and one narrow hallway to solve. A 90 square metre apartment has exactly the same rooms, plus more square metres of living room, which is the fastest part to design. The work does not grow in proportion to the floor area, and a rate per square metre assumes that it does. Hence the fixed item in every sensible fee structure: a minimum fee per project, regardless of size.

What belongs in the rate and what gets billed separately

The line runs in one place: the rate covers whatever you can size on the day the contract is signed. Everything whose size is unknowable at that moment is billed separately. That single rule settles most of the doubtful cases faster than any list, but a list still helps.

Look closely at the product schedule row. It is the item that drifts most over time, because the product list stays alive for the whole build: something is discontinued, something goes up in price, the client rejects something. Kept in a spreadsheet, every one of those changes means recalculating by hand. A cost estimate kept in one tool recalculates itself, so that item stops generating work nobody pays you for. One distinction worth holding on to: that is the client's project budget, not your fee. Two separate figures that should not share a table.

How to calculate your own rate instead of copying someone else's

Looking at competitors' price lists gives you a reference point but not an answer, because you do not know their costs, their scope, or whether they are making any money on it. Your own rate is built from the bottom, in five steps.

• Add up the studio's monthly fixed costs. Rent, software, accounting, phone, insurance, contributions. This is the amount you have to earn before you earn anything.
• Count the hours you actually sell. Not 160 a month. Subtract quoting, email, social media, admin and product hunting. What is left is usually 90 to 110 hours.
• Add the salary you want to take out. Not “whatever is left over”. A specific figure, treated like any other fixed cost.
• Divide the total by the sellable hours. That gives you the hourly rate at break-even. Below it you are subsidising the work, however impressive the invoice looks.
• Time yourself on two completed projects. Only then can you convert the hourly rate into a rate per square metre or a fixed fee you will not regret in month three.

Step five is the one most often skipped, and it is the single thing separating a fee structure from guesswork. Without measured hours you cannot tell whether your fixed fee is profit or a slow transfer of your savings to the client.

What an interior design project costs and where the differences come from

It is worth looking at your own price list through the client's eyes once, because it explains most of the questions you get. A client collecting three quotes sees three figures that can differ twofold, and has no instrument for understanding why. They do not know your costs or your hours. They see a number and a service name that reads identically in every offer.

The tiers below are orders of magnitude and a starting point for your own verification, not market data. Rates vary between cities, between levels of experience and between scopes strongly enough that the only sensible route is comparing a few real offers from your own market. This table is meant to explain where differences come from, not to tell you what to pay or charge.

The gap between the cheapest and the most expensive quote almost never comes from someone charging more for the same work. It comes from three offers describing three different services under one name. A client who sees that stops asking “why is this so expensive” and starts asking “what is missing from the cheaper one”. That is a far better conversation, and you are the one who can start it by showing the scope as a list of items rather than a single figure.

The practical takeaway for your own quote: next to the figure, put what the figure does not include. It sounds counterintuitive, but exclusions sell better than a list of benefits, because they give the client the only comparison tool they have. They also protect you when, in month three, the question arrives about “those visuals we talked about”.

Site supervision: why it does not fit inside the design fee

Supervision is the only part of the job whose size cannot be estimated at signing, because it depends on the contractor rather than on you. A good crew needs three visits. A weak one can generate fifteen phone calls a week. Folding supervision into the design fee means you make money with a good crew and work a month for free with a bad one, and somebody else decides which of the two you get.

A sensible clause has three parts: a rate per visit or per hour, travel billed separately, and an optional package bought up front, say six visits included with the option to add more. The package gives the client the predictability they want and gives you the boundary you need.

Changes after scope sign-off

The second item that can quietly eat the whole margin. The point is not to forbid changes: a client is entitled to change their mind, and the design sometimes benefits. The point is that a change should have a price and a moment. While you are inside the rounds of revisions the contract allows, a change is included. After the layout is signed off, every further one is additional work billed by the hour.

For that to work you need an unambiguous moment of sign-off. Not “the client said they liked it”, but a recorded acceptance of a specific version, with a date. A client portal solves this as a side effect: the client approves or rejects items on their own screen, and you keep a trace of what was signed off and when. In an argument about an extra invoice, that trace is worth more than the best written clause in the contract.

Six things without which a fee structure does not work

• A minimum fee per project. It protects you against small flats that take as much work as mid-sized ones.
• A cap on revision rounds, stated as a number. Two rounds is a clause. “Until the client is happy” is an open-ended commitment.
• An hourly rate for everything outside the scope. One number that prices every situation you failed to anticipate.
• A payment schedule tied to stages. A deposit up front, the rest against signed-off stages. Not against the calendar.
• A list of exclusions. Short and specific: what this price does not cover. Exclusions prevent extra invoices, scope descriptions do not.
• An expiry date on the quote. Thirty days is enough. Without it a client returns a year later holding your old price list.

Where Listoria fits into this

Listoria will not issue your invoices and will not set your rate. What it takes off your desk is the thing that makes even a well calculated fee fail to hold: the drift between what was agreed and what is actually happening on the project. Sign-offs on individual items are recorded, the client's budget recalculates itself, and a change raised after acceptance shows up as a change rather than as “but that is what we said”.

In practice the biggest difference comes from the client seeing the same budget state you do. The question “are we still inside the number” stops requiring an email and half an hour of your time that nobody billed. A mood board closes the same gap from the other side: it shows what the chosen standard looks like before the client accepts it, so there are fewer rounds of revisions and each one fits inside the number you included in the fee.

In short

A studio price list is not a rate, it is a pair: a figure and the scope that figure covers. You pick the fee model according to who should carry the risk of underestimating, not according to what everyone else is doing. Keep supervision and post-sign-off changes outside the fixed fee, because they are the only items nobody can size at the start. If you are looking for one place to run all of this, start with our overview of interior design software, and to get access to Listoria join the waiting list before the beta opens.