Building or renovating a home in Kolkata: rules and costs (2026)
Design IRL Editorial · Figures checked 9 November 2026 · For anyone building a house, renovating a flat or doing up a new flat in Kolkata · How we make our guides
In Kolkata, stamp duty is 6% up to ₹1 crore and 7% above, plus 1% registration, and painting, reflooring and repairs need no KMC permission. The biggest risks are underfoot: filled-in ponds, soft ground and monsoon flooding, such as the record 251.4 mm that fell in 24 hours in September 2025.
Start here
- Renovating a flat you own: read "Renovating a flat in Kolkata" for what your society and the city need from you, then the costs below.
- Doing up a new flat: check the building's occupancy certificate (OC) before you take possession or start interiors.
- Building a house: your plans need approval before any work on site, filed by a registered architect.
Work out your own numbers
Describe your project in a sentence on Design IRL's "Where do I start?" page (for example "renovating a 1,200 sq ft flat in Kolkata, ₹15 lakh") to see what it should cost at Kolkata rates, the order to do things in, products within budget and firms to hire.
Building a house
- KMC handles building sanctions online. For small plots, a licensed architect or building surveyor uploads the plan and it counts as sanctioned once the fee is paid; KMC inspects later and can revoke it. Sources disagree on the plot-size limit, so check it with your architect.
- Since August 2025, KMC officials must accept, reject or query an online application within 15 days.
- Since 2024 KMC issues a completion certificate only after the building's construction debris has been delivered to its recycling plant.
- Get a soil test: buildings that collapsed in 2024 stood on filled-in ponds.
Renovating a flat or house
Painting, reflooring and repairs to staircases and lift shafts don't need KMC's permission; structural changes or changes to dimensions do. In a flat, the West Bengal Apartment Ownership Act bars work that harms the building's safety, and adding a structure needs written consent from all the other owners. The Calcutta High Court has upheld a jail sentence for an owner who built under a roof-repair permit, so keep to what you're allowed. Your association's bye-laws set working hours, deposits and lift use.
New flats
Check the completion certificate before possession and interiors. The central RERA law applies in West Bengal: the Supreme Court struck down the state's own housing law in 2021.
What's different about Kolkata
- Monsoon flooding: a record 251.4 mm fell in 24 hours on 23 September 2025, and most deaths that day were electrocutions. Keep wiring, sockets and the meter well above flood level, and use earth-leakage protection.
- Humidity and old buildings: plan for damp-proofing and check old load-bearing walls before changes.
- Seismic zone III, under the 2016 code.
Costs and charges in Kolkata
| Charge | Rate | Note |
|---|---|---|
| Stamp duty | 6% up to ₹1 crore, 7% above | The temporary 2% rebate has ended |
| Registration | 1% | |
| Women's concession | Unclear | Recent sources say none; check with the registration office |
We found no reliable published per-sq-ft figures for building or interiors in this city (only builders' and lenders' own estimates). Use the renovation, interiors and house calculators at this city's rates, and get 2–3 quotes on the same drawings.
Common questions
Do I need KMC permission to repair my house in Kolkata?
Not for painting, reflooring or repairs to staircases and lift shafts. Structural changes or changes to dimensions do need KMC's permission, and the Calcutta High Court has upheld a jail sentence for an owner who built under a roof-repair permit.
How do I get a building plan sanctioned in Kolkata?
KMC handles building sanctions online. For small plots, a licensed architect or building surveyor uploads the plan and it counts as sanctioned once the fee is paid, though KMC inspects later and can revoke it. Since August 2025, officials must accept, reject or query an application within 15 days.
How do I get a completion certificate in Kolkata?
Since 2024 KMC issues a completion certificate only after the building's construction debris has been delivered to its recycling plant. Buyers of new flats should check the completion certificate before possession and interiors.
What is the stamp duty in Kolkata?
Stamp duty in Kolkata is 6% up to ₹1 crore and 7% above, as the temporary 2% rebate has ended. Registration is 1%. Whether women get a concession is unclear, so check with the registration office.
Do I need a soil test before building in Kolkata?
Yes. Buildings in Kolkata that collapsed in 2024 stood on filled-in ponds, and the city's soft soil makes a soil test worth doing before you build.
How do I protect a Kolkata home from monsoon flooding?
Keep wiring, sockets and the meter well above flood level and use earth-leakage protection. A record 251.4 mm of rain fell in Kolkata in 24 hours on 23 September 2025, and most deaths that day were electrocutions.
Who to hire in Kolkata
Firms listed on Design IRL in Kolkata, from their own websites. Verified pages and those showing their work come first; it isn't a ranking, and nobody pays to appear.
Interior designers
All 45 interior designers in Kolkata
Amber Creations
Kolkata, India
Rooted in function. Refined through detail.
Works on
Residential, Housing, Hospitality +2
Anjan Gupta Architects
Kolkata, India
Works on
Healthcare, Education, Workplace +2
Architectonic Services
Kolkata, India
Works on
Hospitality, Residential, Housing +2
Internal Affairs Design Studio
Kolkata, India
Founders
Deborup Das, Santanu Dhar
Works on
Residential, Workplace, Retail +1
Architecture firms
All 30 architecture firms in Kolkata
Agrawal & Agrawal
Kolkata, India
Works on
Housing, Workplace, Retail +2
Amber Creations
Kolkata, India
Rooted in function. Refined through detail.
Works on
Residential, Housing, Hospitality +2
Anjan Gupta Architects
Kolkata, India
Works on
Healthcare, Education, Workplace +2
Architectonic Services
Kolkata, India
Works on
Hospitality, Residential, Housing +2
Contractors
All 5 contractors in Kolkata
Mavira Landscapes
Kolkata, India
Works on
Landscape & public realm, Residential, Industrial
AK Enterprises
Kolkata, India
Works on
Workplace, Hospitality, Healthcare +2
Bridge and Roof Co. (India)
Kolkata, India
Works on
Infrastructure, Industrial, Civic & public
Lokenath Buildcon
Kolkata, India
Works on
Housing, Workplace, Education +1
Find the people
Related guides
- House construction cost in India, stage by stage (2026)How house construction costs break down by stage in India, with per-sq-ft rates, soft and hidden costs, and a worked 2,000 sq ft example for Mumbai and Jaipur.
- 1, 2 and 3 BHK interiors cost in India (2026)What interiors for a 1, 2 or 3 BHK roughly cost at each finish level, what the price covers, and how the choice of who does it changes the bill.
- Home renovation cost in India: stages, budget and order (2026)How to scope a renovation, what each level of work roughly costs, and the order to do it in.
- House building approvals and documents in India (2026)The title papers, land-use conversion, plan sanction, certificates and utility NOCs you need to build a house in India, with typical times and costs.
- Stamp duty and registration charges in India, state by state (2026)What eleven states charge to register a home, the lower rates for women, which value the duty is worked on, and how to pay.
Sources
Most published cost figures come from firms that sell the work. We give ranges and you should get 2–3 quotes.
- Millennium Post: KMC 15-day limit for sanctions
- Millennium Post: easier sanction for small plots
- The Telegraph: most house repairs don't need KMC approval
- West Bengal Apartment Ownership Act, 1972
- LiveLaw: Calcutta HC on construction under a repair permit
- The Telegraph: stricter norms for completion certificates
- Bar & Bench: Supreme Court strikes down WBHIRA
- Business Standard: Kolkata rains, Sept 2025
- The Telegraph: collapsed building's plot was a water body
- Ujjivan SFB: stamp duty in West Bengal
- BMTPC: towns in seismic zone III
- Drishti IAS: 2025 seismic code rolled back