Estimate your interior cost
Based on carpet area, finish level and scope. Updates as you type.
How this calculator works
The maths is deliberately simple and we publish it so you can check our arithmetic against any other quote:
- Base cost = carpet area × rate per sq ft. Rates: Essential ₹1,950, Premium ₹2,910, Luxury ₹4,665 — the rate actually billed on completed homes at each finish level.
- City factor. Mumbai ×1.12, Delhi and Bengaluru ×1.08, rest of India ×1.0 — reflecting labour and logistics differences.
- Civil work. Added per sq ft, not as a percentage: ₹248 for civil work, ₹1,254 where new flooring is included (₹248 civil plus ₹1,006 flooring).
- Range. We show ±20% around the rate, which is the spread our own completed projects show at a given finish level.
- Split. Joinery 30.7%, kitchen 11.0%, doors 10.4%, false ceiling 11.9%, electrical 15.5%, painting 4.5%, fittings 9.0%, design and project management 7.0%.
| Finish level | Rate used | Band, rest of India | Band, Mumbai | What it buys |
|---|---|---|---|---|
| Essential | ₹1,950 / sq ft | ₹1,560 – 2,330 | ₹1,750 – 2,610 | Laminate, basic ceiling, standard hardware |
| Premium | ₹2,910 / sq ft | ₹2,330 – 3,490 | ₹2,610 – 3,910 | Acrylic or veneer, BWP ply, designed lighting |
| Luxury | ₹4,665 / sq ft | ₹3,730 – 5,600 | ₹4,180 – 6,270 | PU, stone, imported hardware, automation |
Every rate on this page comes from homes Greenbox has designed, built and invoiced — six measured projects running from a ₹1,419 per sq ft budget refit to a ₹5,100 per sq ft compact luxury flat, held at October 2026. It is still an indicative estimate, not a quotation: a real price depends on your drawings, your site and what you choose to put in it.
Design and build under one accountable roof
What this estimate excludes
- 18% GST (shown separately in the breakdown)
- Appliances, loose furniture, curtains and mattresses
- Society deposits and statutory charges
- Flooring replacement unless you select civil work with new flooring
- Any structural work requiring approvals
- Plumbing and sanitary fittings, HVAC, and light fittings beyond points and wiring
Selected work by Greenbox Design Studio. Tap any image to enlarge.
Frequently asked questions
How accurate is this interior cost calculator?+
It is typically within 10–15% of a final quotation for a standard project, because it uses the same rate bands our estimators apply. It cannot account for your specific drawings, site condition or material brands — those can move the figure either way.
Does the estimate include GST?+
No. The headline figure excludes GST; the breakdown shows 18% GST as a separate line so you can see the all-in number.
What is carpet area versus built-up area?+
Carpet area is the usable floor area within your walls. Built-up includes wall thickness, and super built-up adds a share of common areas. Interior work is quoted on carpet area — using built-up will understate your per-sq-ft rate by roughly 20–30%.
Why is there a range rather than a single number?+
Because specification detail moves the real cost. Across the homes this calculator is built from, two flats of the same size at the same finish level sat up to 20% apart on how much wardrobe, how much ceiling and which hardware. The ±20% band reflects that honestly.