Client guides / India
Renovating a flat in Mumbai: society NOC and BMC rules
Under Section 342 of the Mumbai Municipal Corporation Act, tenantable repairs such as painting, retiling and refitting a kitchen or bathroom need no BMC permission, but a no objection certificate from your housing society is still a must, according to Housing.com's guide to the BMC rules. Structural work needs BMC sanction, usually filed through a licensed architect. This guide covers Mumbai only, and ends with a society NOC request letter you can adapt.
16 October 2026 · 7 minute read
In this guide
- A table of what counts as tenantable repair and what needs BMC sanction
- Who files what: you, the society, the architect
- The 30-year structural audit and the five-year RERA defect window
- An English society NOC request letter, with a Marathi version to follow
Two permissions, and which one you need
A Mumbai flat renovation sits under two gatekeepers. Your cooperative housing society controls access and common property, and gives or withholds a no objection certificate (NOC). The Brihanmumbai Municipal Corporation (BMC) controls the building's structure under the Mumbai Municipal Corporation Act. Section 342 of that Act separates 'tenantable repairs', which need no permission from the Municipal Commissioner, from alterations that do (Housing.com, BMC guidelines for house repairs).
| Work | BMC permission | Society NOC | Who prepares and files |
|---|---|---|---|
| Painting, replacing tiles, upgrading a kitchen or bathroom, replacing pipes and fittings | Not needed: tenantable repair | Required | You write to the society, with the contractor's scope attached |
| Replacing or removing load-bearing members | Required | Required; the society's view is a factor, the BMC decides | A licensed architect or structural engineer prepares and files |
| Changing the dimensions of rooms, lowering the plinth or floor | Required | Required | Licensed architect or structural engineer |
| Adding a mezzanine or loft | Required | Required | Licensed architect |
| Flattening a roof | Required | Required | Licensed architect or structural engineer |
| Opening walls between tenancies, including merging flats | Required | Required | Licensed architect |
Housing.com's guide adds a condition that is easy to miss: the Section 342 exemption assumes the original structure is legal. If the flat includes an unauthorised extension or an earlier unapproved change, the tenantable repair route may not be open to you. The same guide's experts advise having a registered architect or structural engineer supervise even tenantable repairs.
Who files what
- You file the society NOC request, and the society's managing committee issues the NOC. For tenantable repairs this is the only permission you need (Housing.com), and the letter below is for this step.
- A licensed architect or structural engineer prepares and files the BMC proposal for structural work. Housing.com recommends a structural stability report before renovation.
- The society commissions the structural audit of the building. An advocate quoted by Housing.com says a structural audit is mandatory once a building passes 30 years.
Older buildings: the 30-year audit
If your building is more than 30 years old, a structural audit is mandatory, according to an advocate quoted in Housing.com's guide. Ask the society for the latest audit report before you plan anything that loads the slab or touches the walls. If the society does not have one, solve that before the renovation, not after.
Renovating in the first five years: the RERA question
Under Section 14(3) of the Real Estate (Regulation and Development) Act, the promoter must rectify structural defects and defects in workmanship or quality that you report within five years of possession, free of charge and within 30 days, failing which you are entitled to compensation (Housing.com, builder warranty under RERA). Some guides claim that damage caused by an owner's own renovations falls outside this liability. We found no RERA order deciding the point, so treat it as unsettled.
The society NOC letter
Societies rarely publish a format, so members search for one: 'society noc format for flat renovation' and 'flat renovation letter to society in marathi' both appear in Google's autocomplete suggestions for India (checked 10 October 2026). Below is an English request letter you can adapt. It states the scope, the dates, the contractor and an undertaking on common areas; your society may ask for more, so check its bye-laws and any conditions it attaches to NOCs.
To, The Hon. Secretary and the Managing Committee, [Name] Co-operative Housing Society Ltd, [Address], Mumbai [PIN] Date: [date] Subject: Request for a No Objection Certificate for interior renovation of Flat No. [number], [wing and floor] Respected Sir or Madam, I/We, [name(s)], member(s) of the Society in respect of Flat No. [number], request a No Objection Certificate for interior renovation of the flat. Scope of work: [painting; replacement of floor tiles; replacement of the kitchen platform and cabinets; replacement of bathroom fittings and plumbing within the flat; other items]. No load-bearing wall, column, beam or slab will be altered, and no change will be made to the external elevation, the common areas or the dimensions of the flat. The work falls within tenantable repairs under Section 342 of the Mumbai Municipal Corporation Act, and no permission of the Municipal Corporation is being sought. Proposed dates: from [date] to [date], within the working hours permitted by the Society. Contractor: [name, firm, mobile number]. Supervising architect or engineer, if any: [name and registration number]. Undertakings: I/We undertake to remove debris at my/our own cost, to protect the lift, staircase and common passages, to make good any damage to common property, to comply with the Society's bye-laws and any conditions attached to the NOC, and to pay any refundable deposit or charges the Society requires. Kindly issue the NOC at your earliest convenience. Yours faithfully, [Name], Flat No. [number], [mobile], [email] Enclosures: [scope of work; contractor's quotation; drawings, if any]
Who may call themselves an architect
If your renovation needs BMC sanction, you will be hiring a professional to prepare and file it. Under Section 37 of the Architects Act 1972, only a person registered with the Council of Architecture may use the title and style of 'architect' (India Code). A first conviction for misuse carries a fine of up to Rs 500, and a later one up to six months' imprisonment or a fine of up to Rs 1,000 or both; falsely claiming registration carries a fine of up to Rs 1,000 under Section 36. Ask for the Council registration number and check it.
Fees are a separate question. The Council of Architecture publishes a Scale of Charges under its 1989 regulations, and a 2015 CPWD memo says the scale is not approved by Parliament and that architects in competitive bids routinely offer lower fees (Architexturez). Our article on the COA Scale of Charges explains what the scale says and how the stages release.
Questions people ask
Do I need BMC permission to renovate my flat in Mumbai?
Not for tenantable repairs. Housing.com's guide to Section 342 says painting, replacing tiles, upgrading a kitchen or bathroom and replacing pipes and fittings need no permission from the Municipal Commissioner, provided the original structure is legal. A society NOC is still required. Structural work needs BMC sanction.
Do I need a society NOC for painting and tiling?
Yes. Housing.com's guide says that even for tenantable repairs an NOC from the society is a must. Adapt the request letter on this page and have it reviewed before sending.
What work needs BMC sanction?
Replacing or removing load-bearing members, changing room dimensions, lowering the plinth or floor, adding a mezzanine or loft, flattening a roof, and opening walls between tenancies, according to Housing.com. A licensed architect or structural engineer prepares and files the proposal.
Is a structural audit compulsory before renovating?
An advocate quoted by Housing.com says a structural audit is mandatory once a building is more than 30 years old, and the guide recommends a structural stability report before any renovation. The society commissions the audit; ask for the latest report.
Can I merge two flats?
Opening walls between tenancies is not a tenantable repair and needs BMC permission (Housing.com), filed through a licensed architect. The society NOC is also required.
Is there a Marathi version of the NOC letter?
A Marathi version will follow once it has been through legal review. We have not published a Marathi text we could not verify.
Sources
- Housing.com, Beware of illegal renovations: BMC guidelines for house repairs (Section 342) · News
- Housing.com, BMC relaxes home renovation rules (proposal; adoption unconfirmed), undated · News
- Housing.com, What is builder warranty under RERA (Section 14(3)) · News
- Architects Act 1972, India Code · Official
- CPWD office memorandum on the Council of Architecture scale of charges, 2015, via Architexturez · Secondary
- Google autocomplete, gl=in, 10 October 2026 (query presence only, not volume) · Observation