A completion certificate is the authority’s confirmation that a building has been built according to its approved plan and is fit to occupy. In Tamil Nadu, most apartment buildings and larger residential projects need one before they can get permanent electricity, water and sewer connections, and it is a key document for home loans, resale and your peace of mind. Small homes within set limits are exempt. If you are buying a flat or villa in Coimbatore, asking for the completion certificate, and reading it, is one of the simplest ways to avoid buying into an unauthorised building.
Key takeaways
- Under TNCDBR 2019, buildings need a completion certificate before occupation, unless they fall within the exemption.
- Since March 2024, residential buildings up to 14 m high with not more than eight units, or within 750 sq m, are exempt.
- Electricity, water and sewer connections are tied to the completion certificate for buildings that need one.
- Under RERA, the promoter must obtain the completion or occupancy certificate and hand it over.
- Ask for the certificate before registration of a ready home, and check it covers your block and floor.
What a completion certificate is
When a building permit is issued, the owner or developer agrees to build to the approved plan: the setbacks, floors, height, parking and open spaces shown in it. On completion, the developer applies to the authority that issued the permit (for example Coimbatore Corporation, a municipality, the Local Planning Authority or DTCP), which inspects the building and, if satisfied, issues a completion certificate. Some documents and people still use the older term occupancy certificate for the same idea.
Which buildings need one in Tamil Nadu
Rule 20 of the Tamil Nadu Combined Development and Building Rules, 2019 deals with completion certificates. The original 2019 exemption covered residential buildings up to 12 m in height with not more than three dwelling units, or up to 750 sq m, plus industrial buildings. The March 2024 amendments widened this.
| Building | Completion certificate needed? |
|---|---|
| Residential building up to 14 m high with not more than 8 dwelling units, or within 750 sq m | Exempt (after March 2024 amendment) |
| Industrial buildings | Exempt under Rule 20 |
| Apartment buildings above the exemption limits | Yes |
| Commercial buildings, offices, showrooms | Yes, unless covered by a specific exemption |
| High-rise buildings (above 18.30 m) | Yes, with fire and other clearances |
Exemption is not permission to deviate. An exempt home must still be built to its approved plan.
Why it matters to a buyer
Utilities
The rules link service connections (electricity, water supply and sewerage) to the completion certificate for buildings that require one. A project without it may run on temporary construction power or tanker water for a long time.
Proof the building matches the plan
Extra floors, reduced setbacks, converted parking or missing fire safety features are the kinds of deviations that stop a completion certificate being issued. If a builder cannot produce one long after construction ended, ask why.
Loans and resale
Banks look for approval and completion documents when lending on ready homes, and future buyers and their lenders will ask for them too. A missing certificate narrows your pool of buyers and may reduce the price you can command. See our home loan EMI and budget guide for the lending side.
Your rights under RERA
Under the Real Estate (Regulation and Development) Act, 2016, the promoter of a registered project is responsible for obtaining the completion or occupancy certificate from the competent authority and making it available to allottees or the association. If possession is offered without it, you can raise the issue with TNRERA. Our guide to TNRERA registration and complaints explains how.
How to check a completion certificate
- Get a copy. Ask the builder for the certificate and the approved plan it refers to.
- Match the permit number. The certificate should reference the same building permit or planning permission number as the approved plan.
- Check the scope. In phased projects, confirm the certificate covers your block or tower, and all floors including yours.
- Compare with the site. The number of floors, flats and parking spaces on site should match.
- Verify with the authority if anything looks off, by checking the portal records or writing to the issuing office.
Under-construction and resale homes
Under-construction: the certificate will come at the end, so your agreement should make handover of the completion certificate a clear condition of possession. Check the project’s TNRERA page for approvals uploaded by the promoter.
Resale: ask the seller for the certificate (or evidence that the building was exempt), along with the approved plan, property tax receipts and utility bills in the seller’s name. For an older independent house, confirm that later additions such as an extra floor were approved.
Red flags
- The builder offers possession “now” and the certificate “later”, with no date or reason.
- The certificate covers fewer floors than the building has.
- Stilt parking has been enclosed or converted into flats or shops.
- Temporary electricity connection continues months after residents move in.
Shortlisting ready homes? Browse flats and apartments in Coimbatore and ask us for the approval documents on any listing.
Frequently asked questions
Is a completion certificate the same as an occupancy certificate?
In everyday use in Tamil Nadu, the terms are often used for the same thing: the authority’s confirmation that a building was built as approved and can be occupied. TNCDBR 2019 uses the term completion certificate.
Does my independent house need a completion certificate?
Not if it is residential, up to 14 m high and has no more than eight units, or is within 750 sq m, following the March 2024 amendment. It must still match the approved plan.
Can I buy a flat in a building without a completion certificate?
You can, but it carries risk: utility connections, loans and resale may be affected, and the building may have deviations. Take legal advice and get the builder’s written commitment and timeline.
Who applies for the completion certificate?
The owner or developer who obtained the building permit applies to the authority that issued it. In RERA-registered projects this is the promoter’s responsibility.
This article is general information as of September 2026, not legal, tax or financial advice. Rules and rates change; confirm with a qualified advocate, chartered accountant or the relevant department before you act.
References
- Tamil Nadu Combined Development and Building Rules, 2019 (Rule 20)
- Fox Mandal: TN building rules amendments, March 2024
- Outlook India: Tamil Nadu amends building rules (March 2024)
- TNRERA: Tamil Nadu Real Estate Regulatory Authority
Buying a ready home in Coimbatore?
Our team can help you collect and review the approval and completion documents for any home you shortlist, and connect you with an advocate for a formal opinion.
