Occupancy Certificate vs Completion Certificate: What Changes

The possession letter arrives, the keys are handed over in the sales office, and somewhere in the folder there is a certificate with an official-looking seal. Ask which one it is. If it is a completion certificate and not an occupancy certificate, you have been given permission to own the flat but not permission to live in it, and the difference costs money every month you stay there.

Builders blur the two deliberately because a completion certificate is easier to get and arrives earlier. Buyers accept the blur because both documents come from the same office and both say the building is finished. They do not mean the same thing.

Key takeaways

• The completion certificate says the building matches the sanctioned plan. The occupancy certificate says it is fit and legal to occupy — fire, lift, water, sewerage, power and structural clearances all in place.
• Occupying without an OC is a building bylaw violation. Municipal bodies can levy penalties, refuse permanent water and power connections, and in extreme cases seal the unit.
• GST law names the completion certificate and first occupation, not the OC. Once either has happened the sale is outside GST; under construction you pay 1% on affordable and 5% on other residential units, without input credit.
• A part OC covers only the towers named on it. Your tower can be legally occupied while the project as a whole is still incomplete.
• Section 17 of RERA requires conveyance within three months of the occupancy certificate where no local law sets a different period — the OC is what starts that clock.

Two certificates, one office

Both are issued by the local planning authority that sanctioned the building plan — the municipal corporation in most cities, or a development authority such as DTCP in Haryana, GMDA, NOIDA, BDA or BMC depending on where the land sits. The builder applies for each; neither is issued to you.

In several states the two are effectively merged into a single "occupancy-cum-completion certificate", which is why the terms get used interchangeably in sales conversations. Read the document itself, not the covering letter.

Why the OC is the one that matters

Living in a building without an occupancy certificate is a violation of the municipal act and the building bylaws that apply to the land. Three practical consequences follow.

The first is billing, and there is a decided figure on it. In Samruddhi Co-operative Housing Society v Mumbai Mahalaxmi Construction, decided by the Supreme Court on 11 January 2022, the members had been paying property tax 25% above the normal rate and water charges 50% above the normal rate because the builder never obtained the OC. The Court held that failure to obtain an occupancy certificate is a deficiency in service and a continuing wrong, so limitation did not bar the claim, and the society could recover the excess from the developer. Without an OC, water and power connections are also frequently released only on a temporary or non-domestic basis, again at a higher tariff.

The second is resale. Most lenders will not fund a resale purchase in a tower with no OC, which removes the majority of your buyer pool. Cash buyers know this and price it in.

The third is regularisation risk. If the OC is missing because the builder overbuilt — an extra floor, a shortfall in setbacks, a converted stilt — then the missing certificate is not paperwork. It is a construction deviation that may never be regularised, and the municipal body's remedy is directed at the structure, not the builder's balance sheet.

The GST consequence, in rupees

Read the statute carefully here, because it does not say what sales teams say it does. GST law refers to the completion certificate issued by the competent authority and to first occupation, whichever is earlier. The occupancy certificate is not named at all; it matters as evidence that first occupation could lawfully happen. Once either event has occurred, the sale is neither a supply of goods nor of services. Before it, the transaction is a supply of construction service and taxable.

Affordable means carpet area up to 60 sq m in metro cities and 90 sq m elsewhere, and a value not above Rs 45 lakh — both tests, not either. Stamp duty and registration are separate and payable either way. Our note on the residential GST rate works through the segment tests in detail.

There is a diagnostic hidden in this. If a builder charged you GST on an instalment, the building did not have a completion certificate on that date, whatever the sales team said. Your own payment receipts are evidence of when the project was actually complete.

Part OC: legal for some, not for all

A part or partial occupancy certificate is issued for specific completed towers or floors within a larger phased project. It is a real certificate and your flat, if named in it, is legally occupiable. The same split runs through GST: a part OC or part completion certificate takes the units it covers outside GST, while units in the towers still under construction stay taxable. Being inside a project with a part OC does not put your unit inside the certificate — read the floor and tower numbers on the document itself.

What it does not do is confirm the project is finished. Clubhouse, landscaping, the second basement, the STP and the remaining towers can all still be under construction, and in a project running on a part OC you are frequently living on a site. Before accepting possession on a part OC, get three things in writing: the tower and floor numbers the certificate covers, the committed date for the full OC, and the builder's confirmation that common amenities promised in your agreement are covered by the sanctioned plan for a later phase. Then read the possession letter against that list before you sign the handover.

When the OC never arrives

This is common enough in Delhi NCR that buyers treat it as normal. It is not, and there are four routes.

• Hold back the final payment. The last 5% is the only leverage you will ever have. Once it is paid and you have taken keys, the builder's incentive drops sharply.
• File a RERA complaint. Section 11(4)(b) makes the promoter responsible for obtaining the completion or occupancy certificate, or both, from the competent authority and making it available to allottees. Authorities have passed directions with time limits and penalties. The HRERA complaint process is the route in Gurgaon and Faridabad.
• Act as an association. One buyer is easy to ignore; the apartment owners' association applying to the municipal body, with RTI on the OC application status, is not. This usually runs alongside the conveyance of the land title, because the same builder is usually sitting on both.
• Claim the loss, not just the certificate. Excess property tax, higher water tariffs and the cost of temporary connections are quantifiable and recoverable. Keep every bill.

How to check a project's OC before you buy

Do not accept a photocopy. The certificate carries a number, a date and the name of the issuing authority — verify all three at source.

• Search the project page on the state RERA portal. Promoters upload the OC and quarterly progress there, and the project status field will say whether the project is complete.
• Ask the municipal corporation or development authority directly, or file an RTI naming the building plan sanction number.
• Check the property tax bill for any existing flat in the tower — the assessment usually changes once an OC exists.
• Ask a resale seller for their registered conveyance deed. In most states the sub-registrar will not register a conveyance for a building that has no OC.
• Check whether GST was charged on the last instalment. As above, it is a date stamp on completion.

FAQ

Can I take possession without an occupancy certificate?

You can physically move in, and many buyers do, but the occupation is unauthorised under the municipal bylaws. Expect higher utility tariffs, difficulty with resale lending, and no protection if the building's deviations are later found unregularisable.

Is a completion certificate enough for a home loan?

Many lenders release the final tranche against a completion certificate, but most ask for the OC before the possession disbursement, and almost all insist on it for a resale purchase. Assume you need the OC.

Do I pay GST on a ready flat?

No. Once the completion certificate has been issued or the building has been first occupied, the sale is outside GST. Only stamp duty and registration apply.

What is the difference between a part OC and a full OC?

A part OC certifies specific towers or floors within a phased project and is valid for those units alone. A full OC covers the whole project including common areas and amenities.

How long should an OC take after construction ends?

Where every clearance is already in hand, authorities typically act within 30 to 60 days of the application. Delays beyond that are usually caused by a pending fire NOC, an unresolved plan deviation or unpaid development charges, not by the file moving slowly.

Before you take the keys

Ask for the OC number in writing, verify it with the issuing authority, and keep the answer with your possession and delay record. If a builder is pressing you to take handover against a certificate you have not seen, send us the documents and we will tell you which one you are actually holding.