Interior design charges in India — per sqft, percentage, or lump sum

There are three ways an interior designer in India quotes a fee, and they are usually presented as three prices. They are not. They are three different answers to one question: what happens when the project changes? It always changes. Choosing the model is really choosing who absorbs that.

The three models, and what they actually cost

• Per square foot. A design fee commonly falls between ₹50 and ₹500+ per sqft of carpet area, depending on the depth of service and the city. Note this is the design fee, not the cost of executing the work — a full turnkey interior is a different and much larger number, usually quoted per sqft as well, which is where most of the confusion on this topic comes from.
• Percentage of project cost. Typically 6% to 15% of what the interiors actually cost. Higher at the low end of project value, lower on large projects.
• Lump sum, or per room. A fixed figure agreed against a defined scope. Common for single rooms, kitchens and smaller flats.

Consultations are usually separate, roughly ₹500–2,500 per hour, and often adjusted against the fee if the client goes ahead. All of these bands are indicative: a designer in South Bombay and one in Kozhikode are not in the same market.

What each model does when the project changes

This is the part that matters and the part nobody writes about.

• Per sqft is stable but blunt. The area does not change, so the fee does not — which protects the client and punishes the designer. A client who redesigns the kitchen three times pays exactly what a client who approves the first drawing pays. The area measures the flat, not the work.
• Percentage aligns effort and fee, and creates a suspicion. If the fee is 10% of project cost, a costlier project pays more — which is fair, because a costlier project genuinely is more work. But it also means the person recommending the marble has a financial interest in the marble, and a sharp client will notice. Percentage works best when the designer is not also supplying the materials, or when the rate steps down as value rises.
• Lump sum is the clearest and the most dangerous.The client knows the number on day one. The designer carries every revision, every site surprise and every “can we just try it in oak” — unless the scope it was quoted against is written down precisely enough to point at.

Where the money actually goes

For a homeowner budgeting a full interior, the design fee is the smallest line. A typical split of the total:

• Materials — roughly 45–55%
• Labour — roughly 30–35%
• Design fee — roughly 10–15%
• Transport, permissions, contingency — roughly 5–10%, and the line people forget until they need it

Which is worth saying plainly to clients who are negotiating hardest on the fee: the fee is not where their budget is. Their budget is in the material specification, and that is a conversation that saves them real money rather than a few percent.

The same ambiguity runs through the work itself, not just the fee. “Per sqft” on a wardrobe or a false ceiling can mean two different areas, and both calculators print both — worth a look before you quote either the fee or the work on a rate nobody has defined.

The line that decides whether the fee is argued about

Not the number. The exclusions. Almost every fee dispute in this trade is about something the client assumed was included — and assumptions are formed by silence, not by disagreement.

The exclusions worth naming explicitly, whichever model you use:

• How many design revisions the fee covers, and what a further revision costs. “Two rounds of revisions per space” is a sentence that pays for itself the first time it is used.
• Whether site supervision is included, and how often. “Weekly site visit” and “available on call” are very different jobs.
• Whether 3D visualisation is part of the fee or an add-on, and how many views.
• Whether procurement and vendor coordination is your work or theirs.
• What happens to the fee if the project is paused or abandoned — the single most useful clause in the document, and the one almost nobody writes.

How to present it so the client says yes

Not as a fee. As a fee against a scope, on the same document as the work, with payment stages that say when each part is due. A fee quoted alone invites comparison against other fees quoted alone, which is a race nobody good wins. A fee quoted as part of a line-by-line document invites comparison of what is being delivered, which is a race worth entering.

And write the revision and variation rules into the same document rather than into an email afterwards. The most expensive sentence in this business is “we'll sort that out later” — it is how margin leaves a project one small favour at a time.

The short version

For a homeowner: expect the design fee to be 10–15% of your interior budget, ask what the number excludes before you ask whether it can come down, and be more interested in the material specification than the fee.

For a designer: pick per sqft for predictability, percentage when you are not supplying materials, lump sum only when the scope is written tightly enough to defend. Then spend your effort on the exclusions rather than the rate — because that is where the argument will be, every single time.