Documents to Check Before Buying a Flat in India

By Aniket Bhardwaj · 15 Oct 2026 · 6 min read · Buying

Purchasing an apartment is one of the most substantial financial commitments most people make in their lifetime. While modern property portals simplify the initial search by connecting buyers directly with sellers and builders, verifying paperwork remains the buyer's primary responsibility. GreatProperty provides a platform where people can buy, sell, or rent flats, houses, plots, and commercial spaces, where listings are free and reviewed before going live, with zero brokerage. Even so, property transactions in India involve multiple legal layers. Because property regulations, stamp duties, and registration procedures vary across states and change over time, the following guidance offers general educational insight rather than legal or financial counsel. Always consult a qualified property advocate or visit the local sub-registrar office before making financial commitments.

1. Ownership and Title Verification Documents

Verifying clear ownership is the bedrock of any real estate transaction. You must confirm that the seller holds absolute title to the apartment and has the full legal right to transfer ownership.

Title Deed: Also referred to as the mother deed or conveyance deed, this document establishes who owns the property. Ask your advocate how far back the chain of ownership should be traced (a period of around thirty years is commonly mentioned) to confirm there is an unbroken chain of transfers.
Sale Deed: If buying a resale flat, review the current owner's registered sale deed to verify that the property was properly transferred and registered in their name.
Chain Documents: For properties that have changed hands multiple times, examine prior conveyance deeds, gift deeds, partitions, or wills to ensure no ownership gaps exist.
Power of Attorney (PoA): If an agent or representative signs on behalf of the owner, inspect the registered General Power of Attorney or Special Power of Attorney to confirm it remains valid and explicitly grants authority to sell.

2. Project Approvals and Land Titles

When purchasing from a builder or buying a flat in an apartment complex, verify that the developer acquired lawful rights to the land and secured all required civic sanctions.

Title Search Report: A legal opinion prepared by an advocate, detailing the history of the land title and confirming whether the plot is free from disputes.
Development Agreement and Power of Attorney: In joint-venture projects between landowners and developers, review the registered development agreement to confirm the builder's share of apartments and authority to sell them.
Land Conversion Order: Agricultural land must undergo formal conversion to non-agricultural residential use through the competent revenue authority before construction begins.
Approved Building Plan: Review the layout and sanction plan approved by the local municipal corporation or town planning authority. Ensure the flat you intend to purchase matches the approved drawings without illegal deviations.

3. Regulatory Approvals and Building Certificates

State municipal laws mandate specific clearances before a building is deemed fit for residential living. Without these approvals, local authorities may classify the structure as unauthorized.

RERA Registration: For new or ongoing residential projects, check the developer's registration on the official state Real Estate Regulatory Authority portal. The portal discloses sanctioned layout plans, project phases, completion schedules, and promoter background.
Commencement Certificate (CC): Issued by the municipal body, this document certifies that construction has commenced in accordance with approved building standards and boundary setbacks.
Occupancy Certificate (OC): Issued after construction finishes, the OC confirms that the building was erected according to sanctioned plans and is safe for occupation. Civic bodies generally require an OC before granting permanent water and electricity connections.
Completion Certificate: Issued by local authorities or licensed architects, this confirms that construction was completed according to approved specifications.

4. Financial and Encumbrance Records

A flat must be free from undisclosed financial liabilities, mortgages, court attachments, and tax arrears before title transfer.

Encumbrance Certificate (EC): Obtained from the sub-registrar office under whose jurisdiction the property sits, the EC records registered financial transactions and legal claims over a specified timeframe. Ask your advocate how many years the EC should cover; periods such as fifteen to thirty years are commonly requested.
No Objection Certificate (NOC) from Banks: If the builder took a commercial project loan to finance construction, request an NOC or release deed from the lending bank confirming that your specific apartment is released from the builder's overall mortgage.
Home Loan Foreclosure Letter: In a resale transaction where the previous owner took a home loan, ensure they furnish a loan closure letter, a no-dues certificate from the lender, and retrieve all original title papers deposited as collateral.

5. Local Authority, Society, and Utility Clearances

Beyond structural permissions, practical ownership requires confirming that recurring municipal charges, taxes, and cooperative dues are settled up to the handover date.

Khata or Mutation Extract: Known by different terms such as Khata, Patta, or Mutation entry depending on the state, this revenue record proves that the property is entered in municipal records for local property tax assessment.
Property Tax Receipts: Review original receipts proving that property tax has been paid to the local municipal authority without outstanding arrears.
Society NOC and Share Certificate: In an established cooperative housing society or apartment owners association, obtain an NOC certifying that the seller owes no maintenance dues and that the society has no objection to the transfer.
Utility Bills: Check the latest paid bills and receipts for electricity, piped gas, and water connections to prevent inheriting previous owners' unpaid arrears.

6. Agreements to Execute During the Purchase

The transaction concludes through carefully drafted formal contracts that formalize financial obligations and complete the lawful handover.

Agreement for Sale (Sale Agreement): Defines terms, payment schedules, possession dates, penalties for delay, and specifications of the flat. In many states, this agreement must be stamped and registered.
Allotment Letter: Provided by developers in primary sales, specifying the flat number, floor, carpet area, and payment plan.
Sale Deed (Conveyance Deed): The primary legal document that transfers ownership from seller to buyer. It is signed by both parties, stamped at applicable state duty rates, and registered at the local sub-registrar office in the presence of witnesses.
Possession Letter: Issued by the builder or seller upon handing over physical keys and site control, confirming that the buyer has accepted possession.

Key takeaways

Examine the chain of title deeds, for as many years as your advocate advises, to verify unbroken, lawful ownership.
Verify the project on your state RERA portal and confirm municipal sanction plans before paying deposits.
Ensure the building has an approved Commencement Certificate during construction and an Occupancy Certificate prior to move-in.
Obtain an updated Encumbrance Certificate from the sub-registrar office to ensure no unresolved mortgages or legal claims exist.
Check that property taxes, society maintenance charges, and utility bills are fully paid up to the transfer date.
Engage an independent, qualified property lawyer to vet all documentation according to local state rules.

This article is general information, not legal or financial advice. Laws, stamp duty and rent rules differ from state to state and change over time — confirm the details with the local sub-registrar office or a qualified lawyer before you sign or pay.