The 12 documents to check before buying a flat, and what each one hides

Home buyers in India transact lakhs of units a year, roughly 97,000 in the top seven cities in the third quarter of 2025 alone according to ANAROCK data, and most sign agreements after reading fewer documents than they would for a second-hand car. The gap is not laziness. It is that nobody hands buyers a list ordered by what can actually go wrong. This is that list: twelve documents, in verification order, with the specific defect each one is meant to catch.

Land and title: the foundation#

1. Title report#

A lawyer's certification of who owns the land and how it reached the promoter, tracing typically 30 years of transfers. RERA requires promoters to file a title report at registration, so it is public. What it hides if unread: co-owners who never consented, pending partition among family branches, land ceiling issues, or agricultural land never converted. Any of these can freeze a project for years regardless of construction quality.

2. Development agreement or sale deed for the land#

If the promoter does not own the land outright, a development agreement with the landowner defines the builder's rights and the owner's share. What to look for: whether the agreement actually authorises sale of your unit, and what happens to buyers if the landowner and builder fall out.

3. Encumbrance certificate#

Issued by the sub-registrar, listing registered charges on the land: mortgages, liens, prior sales. A construction loan mortgage is normal and disclosed in filings; what should alarm you is an undisclosed charge, or your specific flat already sold or mortgaged to someone else. What it does and does not reveal, and how many years to request, is covered in the encumbrance certificate guide.

Approvals: permission to build what is being sold#

4. Sanctioned plan#

The municipal approval drawing: floors, units, layout, FSI consumed. Compare what you are being sold against it. A "garden-facing 3 BHK on the 14th floor" of a building sanctioned for 12 floors is a promise of illegality. Deviations from sanctioned plans are among the most litigated issues in Indian housing, and RERA requires two-thirds allottee consent for material changes.

5. Commencement certificate (CC)#

The local body's permission to start construction, often issued in stages, for example up to plinth or up to a certain floor. What it hides: construction racing ahead of the certificate. If the tower stands 20 floors and the CC covers 14, the top six exist on hope. Our guide on OC versus CC covers the pair in detail.

6. Environmental and other NOCs#

Larger projects need environmental clearance; location-specific NOCs range from airport height clearance to fire and coastal zone approvals. Missing NOCs surface late and stall projects at the finishing stage, which is the costliest possible moment for buyers.

The RERA layer: the promoter's sworn statements#

7. RERA registration certificate#

Confirms the project is registered, the promoter entity, and the committed completion date. Five minutes on the state portal verifies it; the full routine is here.

8. The declared unit details and carpet areas#

Promoters file carpet areas per unit type. Your agreement must match the filing. The carpet area guide shows how to turn this into a fair price comparison between projects.

9. Quarterly progress reports and Form 1, 2, 3#

The engineer's, architect's and chartered accountant's certificates that accompany quarterly updates and escrow withdrawals. Together they say how much is built, how much is sold and how the money moves. A project whose filings are current, consistent and improving is telling the truth the expensive way. One whose filings stopped two quarters ago is telling you something too. We explain the reading method in the QPR guide.

The transaction documents: where your money changes hands#

10. Allotment letter and payment schedule#

Issued at booking, before the agreement. Check the schedule against the law: not more than 10 percent before a registered agreement for sale, and construction-linked stages that match reality rather than front-loading your money. The full sequence of what you pay and when is mapped in the money timeline, and the state-wise stamp duty and registration charges that fall due on agreement day are set out separately.

11. Agreement for sale#

The contract. The non-negotiable checks: carpet area with the RERA definition, the possession date and grace period, the delay interest clause mirroring your Section 18 rights, the specific unit and parking identified, and the promoter entity matching the RERA certificate. Builders' standard drafts favour builders; every clause you read is a clause you can question.

12. Occupancy certificate, at possession#

The municipal confirmation that the building is fit for occupation. Taking possession without an OC means utilities on temporary connections and legal ambiguity that follows into resale. Refuse "possession for fit-out" as a substitute for a real OC unless you fully understand what you are accepting. When the OC exists and handover day arrives, run the pre-possession inspection checklist before signing anything.

Using the checklist without drowning#

Order matters: title first, approvals second, RERA filings third, transaction papers last, because a failure early in the list makes the rest irrelevant. Run the builder track record check in parallel, since a strong document file from a weak promoter is still a weak purchase. Public documents first, promoter-provided documents second, because the public ones calibrate your scepticism. And for the price of a dinner, a lawyer's opinion on items 1 to 3 and 11 converts this checklist from good practice into real protection.

The RERA-layer documents for any registered project are already organised on its ReraGenie project page, with every quarterly filing preserved. The buyer report adds the checklist verdicts: which documents are present, which are missing, and which questions the gaps should raise at the site office.