These two documents sound the same and are not. A completion certificate says the building was built to the approved plan. An occupancy certificate says it is fit for people to live in. If you only chase one of them, chase the OC — and chase it before you pay the final instalment, because after that you have no leverage left.

The difference in one line each

Completion certificate. The local authority confirms the building was constructed according to the plan it approved. It is about the structure matching the drawing.

Occupancy certificate. The authority confirms the building is fit to be occupied — water, sewerage, electricity, fire safety and the rest actually in place and working.

A building can have one and not the other. In practice the OC is the document that carries weight with banks, with future buyers and with the civic body, so that is the one to hold out for.

Why the OC matters more than people think

It is easy to treat this as filing. It is not. Four consequences follow from a missing OC, and all four cost money.

• GST. A completed property with an occupancy certificate attracts no GST on sale. Without one, the flat is treated as under construction and GST applies. On a purchase of any size that is lakhs.
• Resale. Your eventual buyer’s bank will ask for the OC. If it does not exist, their loan gets harder and your buyer pool shrinks to people paying cash.
• Khata and utilities. Getting the property properly recorded and permanently connected is harder without it. Temporary connections have a way of staying temporary for years.
• Legal exposure. Occupying a building that has not been certified fit for occupation puts you in an awkward position if anything is later found to be non-compliant. The deviation was not yours, but the flat is.

The GST point alone is usually enough to make the case. We set out how that fits with the rest of the statutory cost in stamp duty and registration charges in Bangalore.

Ask before the final instalment

This is the practical heart of it, and the timing is everything.

During construction you hold something the developer wants: the last payment. That is your leverage, and it is the only leverage you get. Once you have paid in full and taken the keys, your position changes from customer to complainant.

What to do instead: put the question in writing early, well before handover. Ask whether the OC has been received, and if not, when it was applied for. Ask what is holding it up — there is usually a specific reason and a developer who knows it will tell you. Then decide what you are comfortable with, in advance, rather than on the day somebody is waving keys at you.

If you are buying ready rather than under construction, the question is simpler and the answer should be immediate. On a genuinely completed project — Prestige Sunrise Park in Electronic City is one where handover is done — the certificate either exists or it does not, and a straight answer takes one phone call.

Partial OC, and why it catches people

Large projects are often certified in parts. A partial occupancy certificate covers some towers and not others.

The trap is obvious once you see it. A developer says “we have the OC” and is telling the truth — for towers A and B. Your flat is in tower D, which is not covered. Nobody lied to you and you still do not have what you need.

The fix is one question: does the certificate cover my specific tower and my specific flat number? Ask to see the document rather than be told about it, and read which blocks it names. This takes two minutes and it is the single most useful thing in this article.

The same logic runs through RERA registration on phased townships, where each phase registers separately — we cover that in how to check a project’s RERA registration. Big projects get approved in pieces, and “the project has it” is never the same as “my unit has it”.

What to collect at handover

Treat handover as a document exchange, not a key ceremony. Five things, and you want them before you sign the possession letter.

1. The occupancy certificate, naming your tower.
2. The completion certificate, if issued.
3. The approved plan, so you can compare what was built to what was sanctioned.
4. Khata details, or a written commitment on when the Khata will be transferred and by whom. Our e-Khata sample walkthrough shows what a genuine certificate looks like.
5. A written snag list, signed by both sides, with dates against each item.

Number five matters more than it sounds. Verbal assurances about the tiling or the plumbing evaporate once the site team moves to the next project. A signed list with dates is a different thing entirely.

If the OC is missing and you already own it

Plenty of people are in this position, and it is not hopeless.

Start by finding out why. A missing OC is usually one of three things: an unresolved deviation from the approved plan, an outstanding payment or compliance item with the authority, or simply that nobody has pushed the application. Those have very different prospects.

Then go collective. An individual owner chasing a developer gets limited traction. An owners’ association asking the same question, in writing, with a record of correspondence, gets considerably more. If the project is RERA-registered, the complaints route exists and the portal carries 13,718 registered complaints — you would not be the first.

And be realistic about resale in the meantime. A flat without an OC can be sold, but the pool of buyers is smaller and the price reflects that. Knowing this before you list is better than discovering it during negotiation.