Estimate your 3BHK interior cost
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Why the third bedroom does not cost a third more
People assume a 3BHK costs 50% more than a 2BHK because it has 50% more bedrooms. It does not. The kitchen, the living and dining joinery, the electrical distribution and the project management are all already paid for by the time you reach the third room. What the third bedroom actually adds is one wardrobe, one bed-back, its share of ceiling and paint, and a little more programme — which is why a 3BHK of 1,000 sq ft usually lands about a third above a comparable 700 sq ft 2BHK, not 50%.
| Item | 2BHK, 700 sq ft | 3BHK, 1,000 sq ft | Difference |
|---|---|---|---|
| Modular kitchen | ₹2.47 L | ₹3.15 L | +28% |
| Bedrooms (wardrobes and units) | ₹6.28 L | ₹9.46 L | +51% |
| Living, dining & doors | ₹4.96 L | ₹5.73 L | +16% |
| Ceiling, lighting and paint | ₹3.68 L | ₹4.92 L | +34% |
| Electrical & light points | ₹3.48 L | ₹4.65 L | +34% |
| Design & project management | ₹1.57 L | ₹2.10 L | +34% |
| Total | ₹22.42 L | ₹30.02 L | +34% |
Mumbai premium finish, excluding 18% GST. The 3BHK is 43% larger but costs 34% more, because the rate per sq ft falls from ₹3,203 to ₹3,002.
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Base rates used
| Finish level | Rest of India | Mumbai | Mid-point used |
|---|---|---|---|
| Essential | ₹1,610 – 2,070 | ₹1,800 – 2,320 | ₹1,840 |
| Premium | ₹2,300 – 3,060 | ₹2,580 – 3,430 | ₹2,680 |
| Luxury | ₹3,780 – 4,770 | ₹4,230 – 5,340 | ₹4,275 |
Mumbai is the rest-of-India rate × 1.12; Delhi and Bengaluru × 1.08.
| Head | Share of the full-scope rate |
|---|---|
| Modular kitchen | 10.5% |
| Each bedroom (wardrobe, bed, bed-back, dresser) | 10.5% |
| Living, dining & doors | 19.1% |
| False ceiling & lighting | 11.9% |
| Painting | 4.5% |
| Electrical & light points | 15.5% |
| Design & project management | 7.0% |
Turning a room off removes its share; electrical and design stay in every estimate because they do.
The per-sq-ft bands here come out of three-bedroom homes Greenbox has finished and invoiced, reconciled against the final account rather than the original quote, and held at October 2026. Treat the output as an indicative estimate: your drawings, your slab and your material list will move it.
How to phase a 3BHK sensibly
- The third bedroom is the natural phase boundary. It is usually a study, guest room or parents' room, it has its own door, and adding it later disrupts nothing already built. Deferring it saves about 10% of the total.
- Never defer electrical. Points, switch positions and data have to be decided across the whole flat in phase one, even for rooms you are not building yet. Chasing walls later is the single most expensive retrofit there is.
- The living room earns the spend in a 3BHK. Unlike a 2BHK, there is room for the joinery to be an actual feature rather than pure storage — this is where a 3BHK budget is best differentiated.
- Ceiling height varies by room. Larger 3BHKs often have a beam grid that makes one room's ceiling considerably more complex. Get that surveyed before the quote.
Selected work by Greenbox Design Studio. Tap any image to enlarge.
Frequently asked questions
How much does a 3BHK interior cost?+
Rest of India, ₹1,610–₹2,070 per sq ft of carpet area at essential finish, ₹2,300–₹3,060 premium and ₹3,780–₹4,770 luxury. On a 1,000 sq ft flat in Mumbai, where the rate runs about 12% higher, that is roughly ₹18–₹23 lakh essential, ₹26–₹34 lakh premium and ₹42–₹53 lakh luxury, excluding 18% GST.
Can I leave the third bedroom until later?+
Yes, and it is the most sensible thing to defer. Set bedrooms to 2 in the calculator to see the saving. Decide its electrical points now and build the joinery whenever you are ready — nothing already finished has to be touched.
Is a 3BHK cheaper per square foot than a 2BHK?+
Usually yes, by roughly 5–8% at the same finish level — ₹2,300–₹3,060 per sq ft against ₹2,420–₹3,300 for a 2BHK. The kitchen, living-room joinery and project management are close to fixed costs, so spreading them over more carpet area brings the per-sq-ft figure down even though the total goes up.
Does the estimate include appliances?+
No. Appliances, loose furniture, curtains and soft furnishings are excluded, and typically add ₹2–5 lakh depending on specification.
Why does carpet area change the result?+
Because the estimate is carpet area × a rate per sq ft. Larger rooms need more running feet of joinery, more ceiling area and more paint, and the rate per sq ft itself is set by finish level rather than by size. Turning a room off removes that room's share of the rate; electrical and design stay in, because they are in every job.