Legal & Documents
Commencement vs Completion vs Occupancy Certificate
Builders use these three words almost interchangeably. They mean entirely different things, and one of them is worth ₹5 lakh.
The short answer
Commencement Certificate (CC): permission to start building.
Completion Certificate: they built what they were approved to build. Removes 5% GST.
Occupancy Certificate (OC): the building is fit to live in. This is the one that lets you move in.
Builders blur the three. Do not let them.
The comparison
| Commencement Certificate (CC) | Completion Certificate | Occupancy Certificate (OC) | |
|---|---|---|---|
| When issued | Before construction starts | After construction finishes | After the completion certificate |
| What it says | The builder may lawfully begin building, to the sanctioned plan | The building was constructed according to the approved plan | The building is fit for human occupation |
| Who issues it | The local planning authority | The local authority | The local authority |
| What it permits | Construction | Nothing, by itself | You to legally move in |
| Checks | Land title, plan approvals, NOCs | Built as per plan, setbacks, height, FSI | Fire safety, water, sewage, electricity, lifts, structural safety |
| If it's missing | The project is illegal from the start. Walk away. | The building may deviate from the sanctioned plan. | Moving in is unlawful. No legal utility connections. Loans and resale become difficult. |
| The one to demand | Yes — before you buy off-plan | Yes | YES. This is the one. |
In some states the CC and OC are combined into a single document. In others they are separate. Ask which applies where you are buying — and then ask to see the actual document, not a promise of one.
The completion certificate is worth ₹5 lakh
A flat sold before the completion certificate is issued attracts 5% GST (1% for affordable housing).
A flat sold after it has been issued attracts none at all.
On a ₹1 crore flat that is ₹5 lakh. It is the most under-counted number in Indian home buying, and it is a large part of why 'ready to move' costs less than its sticker price suggests.
The occupancy certificate is the one you must not skip
A building can be constructed exactly as approved — completion certificate in hand — and still not be fit to live in. No commissioned lifts. No working fire system. No sewage connection.
The OC is what says: this is safe, and you may lawfully live here.
When a builder says the OC is “coming next month“, ask why it hasn't come. The usual answers:
• They deviated from the approved plan — an extra floor, a covered setback
• Fire safety isn't compliant
• The sewage treatment plant was never built
• Development charges are unpaid
• Amenities that were promised were never completed
Every one of those is a real problem with the building, not a queue at a government office. No OC, no final payment.
How to check all three
- Ask for all three documents. Not promises — the documents.
- Verify the numbers with the local authority. Most maintain online records now.
- Check the RERA portal. A registered project should have uploaded its approvals there.
- Check they cover your tower. Large projects are certified tower by tower and phase by phase.
- Read what the CC actually permits — sometimes only up to a specified height.
- Hold back 5–10% of the price until the OC is in your hand.
“The final instalment is payable on production of the Occupancy Certificate.”
Get that into the agreement. It costs nothing, and on the day it matters it will be the most valuable line in the document.
Frequently asked questions
What is the difference between a completion certificate and an occupancy certificate?
The completion certificate confirms the building was constructed according to the approved plan. The occupancy certificate confirms it is fit for people to live in — fire safety, water, sewage, lifts, structural safety. A building can be exactly as approved and still not be fit to occupy. The OC is the one that lets you legally move in.
Which certificate lets me move in?
The occupancy certificate. Moving in without one is unlawful and can mean no legal utility connections, home loan difficulties and serious problems at resale.
Which certificate affects GST?
The completion certificate. A flat sold before it is issued attracts 5% GST; a flat sold after attracts none. On a Rs 1 crore flat that's a Rs 5 lakh difference.
What is a commencement certificate?
The local authority's permission to start construction, issued after the building plan is sanctioned and all approvals are in place. Building without one makes the construction unauthorised from the first brick — and it does not become authorised later.
Are CC and OC ever the same document?
In some states the completion and occupancy certificates are combined into a single document; in others they are separate. Ask which applies where you're buying, then ask to see the actual certificate rather than accepting an assurance.