Most Chennai homeowners aren't sure which role they actually need — architect, interior designer, or both. This guide breaks down the scope difference, lays out when each is essential, and gives 2026 cost benchmarks for both. Pick wrong and you'll pay for capabilities you don't need or miss critical work that will haunt you.
The roles overlap but aren't interchangeable. Pick the wrong one and you'll either pay for capabilities you don't need or miss critical work that will haunt you in year 2.
| Scope area | Architect | Interior Designer | Both together |
|---|---|---|---|
| Building plan + elevation | ✓ Primary | — | ✓ Coordinated |
| Structural engineering | ✓ Primary | — | ✓ Primary |
| CMDA / DTCP approval filing | ✓ Primary | — | ✓ Primary |
| Foundation, RCC, brickwork | ✓ Primary | — | ✓ Primary |
| Setbacks, FSI, height compliance | ✓ Primary | — | ✓ Primary |
| Façade + exterior design | ✓ Primary | Partial | ✓ Coordinated |
| Internal layout (room placement) | ✓ Primary | ✓ Partial | ✓ Coordinated |
| Wall design + accent | Partial | ✓ Primary | ✓ Coordinated |
| Modular kitchen | — | ✓ Primary | ✓ Primary |
| Wardrobes + storage | — | ✓ Primary | ✓ Primary |
| False ceiling design | Partial | ✓ Primary | ✓ Coordinated |
| Lighting design + fixtures | Partial | ✓ Primary | ✓ Coordinated |
| Sanitaryware selection | — | ✓ Primary | ✓ Primary |
| Flooring + tiling | Partial | ✓ Primary | ✓ Coordinated |
| Painting + finishes | — | ✓ Primary | ✓ Primary |
| Furniture + soft furnishings | — | ✓ Primary | ✓ Primary |
You're building a new house from a plot. Architect designs the building from foundation to roof, files CMDA / DTCP approval, supervises structural construction. Interior designer comes in later for the interior fit-out (modular kitchen, wardrobes, finishes, paint).
You're doing major structural changes — knocking down load-bearing walls, adding a floor, extending a balcony. Architect's structural drawings + stability certificate are mandatory for approval.
You're submitting a building plan for approval. Only a Council of Architecture-registered architect can sign drawings that CMDA / DTCP / Corporation will accept.
Typical architect-only fee: ₹35-180/sq ft tier-wise. For a 1,500 sq ft G+1 home: ₹52,500-2.7 lakh full architectural package with approval filing.
You're moving into a new apartment. The builder has done the civil + structural. You need a modular kitchen, wardrobes for every bedroom, false ceiling, lighting, paint, sanitaryware, furniture. No structural changes. An interior designer alone is enough.
You're refreshing an existing home. Painting + accent walls + new lighting + soft furnishings + maybe a kitchen rebuild. No structural work. Interior designer handles everything.
You're doing only one room or one space. Living room makeover, master bedroom refresh, kitchen-only rebuild. Interior designer's scope, not architect's.
Typical interior designer-only cost: ₹650-2,400/sq ft tier-wise. For a 1,500 sq ft 3 BHK Standard tier: ₹9-16 lakh turnkey.
You're building a new house and want it interior-ready from day one. Architect designs the layout with interior planning already considered — room sizes that fit modular furniture, kitchen wall lengths that match standard cabinets, plumbing routed for chosen sanitaryware positions, electrical points where furniture will go. This coordination is impossible to retrofit later.
You're doing a major renovation with structural changes. Knocking down walls + adding a kitchen requires architect's structural sign-off plus interior designer's modular kitchen execution. Both contracts need to coordinate.
You're commissioning a custom villa or estate. Architect designs the building as architecture. Interior designer designs the lived experience inside. The best villas have both teams working together from concept stage.
Typical combined cost: ₹2,000-3,200/sq ft (construction) + ₹800-2,500/sq ft (interior) = ₹2,800-5,700/sq ft all-in. For a 1,500 sq ft G+1 home: ₹42-85 lakh combined.
Integrated firms (like Homeli — architecture + interior under one contract) simplify accountability. You sign one contract, one team owns the outcome, one warranty covers both.
| Scope | Architect | Interior Designer | Combined |
|---|---|---|---|
| Per sq ft (2026 Chennai) | ₹35-180 | ₹650-2,400 | ₹2,800-5,700 |
| 1,200 sq ft 2 BHK flat | ₹42k-2.1 lakh | ₹7.8-28.8 lakh | — |
| 1,500 sq ft 3 BHK flat | ₹52k-2.7 lakh | ₹9.7-36 lakh | — |
| 1,500 sq ft G+1 house (new build) | ₹52k-2.7 lakh (design only) | ₹9.7-36 lakh (interior) | ₹42-85 lakh (full) |
| 3,000 sq ft villa | ₹1-5.4 lakh (design only) | ₹19.5-72 lakh (interior) | ₹84-170 lakh (full) |
Homeli is one of few Chennai firms offering both architecture + interior under one contract. Free 30-minute consultation to clarify which scope you actually need — even if we're not the right firm for it.
Common Chennai homeowner questions about the architect / interior designer distinction.