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What is the Legal Process of Buying a Resale Flat in Kolkata?

Blog   >   What is the Legal Process of Buying a Resale Flat in Kolkata?

Amartya Banerjee

July 3, 2025

What is the Legal Process of Buying a Resale Flat in Kolkata?

Hello Reader!

Welcome to the blog page of Casa Realty, one of the best real estate company in Kolkata. 

Buying a resale flat in Kolkata is a smart choice for homebuyers looking for ready-to-move-in properties in established neighborhoods. However, unlike buying a new flat from a developer, the process of buying a resale flat involves several legal formalities that need careful attention. At Casa Realty, the best real estate company in Kolkata, we guide you through every step of the legal process to ensure a smooth and secure transaction.

In this blog, let’s break down the legal process of buying a resale flat in Kolkata, from property verification to registration.

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1. Property Title Verification

The first and most crucial step is verifying the title of the property. Ensure that the seller has a clear and marketable title to the flat.

Documents to Check:

  • Original sale deed
  • Chain of previous ownership documents
  • Approved building plan
  • Completion certificate and occupancy certificate
  • Encumbrance certificate (EC) for the last 15-30 years

As the best real estate company in Kolkata, Casa Realty helps clients get the documents legally verified by experienced property lawyers.

2. Check for Outstanding Dues

Before buying a resale flat, it is important to confirm that there are no outstanding dues related to:

  • Property tax
  • Maintenance charges
  • Water or electricity bills
  • Society dues

Request a No Dues Certificate from the housing society or apartment association. This ensures you won’t be liable for the seller’s unpaid bills.

3. Obtain a Sale Agreement

Once the due diligence is complete, the buyer and seller need to draft a Sale Agreement on a stamp paper.

The Sale Agreement must clearly mention:

  • Total sale price
  • Advance amount paid
  • Date of possession
  • Conditions and terms of the sale
  • Payment schedule

This agreement acts as a legal safeguard for both parties during the resale flat in Kolkata transaction. Casa Realty ensures that every Sale Agreement is drafted with professional legal help.

4. Home Loan Sanction (If Applicable)

If you are planning to take a home loan for the resale flat, then your bank will also conduct legal and technical verification.

They will:

  • Evaluate the flat’s age and structure
  • Check the ownership and title documents
  • Value the market worth of the flat

Tip from Casa Realty: Get a pre-approval for the loan before finalizing the deal to quicken the process.

5. Execution of Sale Deed and Registration

This is the final step in buying a resale flat.

Steps involved:

  • Pay the applicable stamp duty and registration fees (around 6-7% of property value in Kolkata)
  • Execute the Sale Deed in the sub-registrar’s office
  • Both buyer and seller, along with two witnesses, must be present

Once registered, the property legally belongs to the buyer.

Casa Realty, the best real estate company in Kolkata, assists buyers through this registration process, ensuring compliance with local laws and regulations.

6. Society Transfer Formalities

After the registration, the buyer must apply for the membership transfer in the housing society.

Documents required:

  • Copy of registered sale deed
  • Society NOC
  • Application for membership
  • Identity proof

The society may charge a nominal transfer fee.

7. Mutation of Property

Once the flat is registered, it is advisable to get the mutation of the property done in the municipal records. Mutation is the process of updating the ownership in the land revenue records.

This is essential for future property tax payments and proof of ownership.

Also Read: How Will AI Affect Real Estate and Marketing?

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  • Title Deed Verification: Examine the original title deed to confirm the seller’s legal ownership. This document traces the chain of ownership and ensures the seller has the right to sell the property. Cross-check the title deed at the sub-registrar’s office for authenticity.
  • Encumbrance Certificate: Obtain this certificate from the sub-registrar’s office to ensure the property is free from any mortgages, loans, or legal claims. It should cover at least the last 30 years to rule out any hidden liabilities.
  • Mutation Certificate: Verify that the property is recorded in the seller’s name in municipal records. This is crucial for transferring ownership and for property tax purposes.
  • Previous Sale Deeds and Ownership History: Review all previous sale deeds to confirm the chain of ownership has no gaps or irregularities. Each transfer should have been properly registered.
  • Property Tax Receipts: Check that all property taxes have been paid up to date. Unpaid taxes can indicate unresolved ownership or legal issues.
  • Approved Building Plan: Ensure the flat was constructed as per sanctioned plans from the Kolkata Municipal Corporation. This protects you from risks like legal disputes or demolition orders due to unauthorized construction.
  • Occupancy/Completion Certificate: This certifies that the building is legally fit for occupation and was constructed according to approved plans.
  • No Objection Certificates (NOCs): Obtain NOCs from the society, municipality, and utility providers to confirm there are no pending dues or legal disputes.
  • Power of Attorney (if applicable): If the property is being sold by someone other than the owner, verify the Power of Attorney to ensure the seller is authorized to transact.
  • Seller’s Identity Proof: Request government-issued ID and PAN card from the seller to confirm their identity and prevent fraud.
  • Bank Approvals: If the property has been approved for a loan by a reputed bank, it indicates that the property has already undergone a thorough legal check.
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What steps are involved in verifying the building permits and compliance for Kolkata flats?

To verify building permits and compliance for flats in Kolkata, follow these structured steps to ensure the property meets all legal and regulatory requirements:

  1. Check RERA Registration
    • Confirm the project and developer are registered with the West Bengal Real Estate Regulatory Authority (RERA). The RERA portal provides details on project approvals, layout plans, and construction progress. RERA registration is legally mandatory for most projects and offers buyer protection.
  2. Verify Approved Building Plan
    • Obtain and review the building plan sanctioned by the Kolkata Municipal Corporation (KMC) or relevant Urban Local Body (ULB). The plan should match the actual construction and adhere to local zoning and land use regulations.
  3. Review Building Permit
    • Ensure the builder has received a valid building permit from KMC or the ULB. This permit confirms that the construction is authorized and complies with municipal rules.
  4. Check Occupancy Certificate (OC) or Completion Certificate (CC)
    • The OC/CC is issued by the municipal authority after verifying that the building was constructed as per sanctioned plans and is fit for occupation. This certificate is crucial for legal possession and utility connections.
  5. Examine No Objection Certificates (NOCs)
    • Verify that all required NOCs (from fire, water, electricity, and environmental authorities) have been obtained and uploaded as part of the compliance process.
  6. Consult the Online Building Plan Approval System (OBPAS)
    • Use the OBPAS portal to cross-check the approval status of building plans and permits issued by the Department of Urban Development & Municipal Affairs, West Bengal.
  7. Structural and Safety Compliance
    • Ensure the building has passed structural safety inspections and fire safety requirements as mandated by KMC. This includes checking for compliance with prescribed safety measures and installation of necessary equipment.
  8. Legal Due Diligence
    • Conduct a thorough legal check, including title search, encumbrance certificate, and verification of all compliance documents. Professional legal assistance is recommended for comprehensive verification.
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How do you confirm compliance with local laws during property verification in Kolkata?

To confirm compliance with local laws during property verification in Kolkata, follow these essential steps:

  • Title Deed Verification
    Ensure the title deed is original, clear, and in the seller’s name. This confirms legal ownership and the seller’s right to transfer the property.
  • Encumbrance Certificate
    Obtain this from the sub-registrar’s office to confirm the property is free from legal or financial liabilities such as mortgages, liens, or court cases.
  • Property Tax Receipts
    Check that all property taxes are paid up-to-date. This not only confirms municipal recognition but also indicates there are no outstanding dues.
  • Approved Building Plan
    Verify that the building plan has been sanctioned by the Kolkata Municipal Corporation or the relevant authority. This ensures the property complies with local building and zoning laws.
  • No Objection Certificates (NOCs)
    Collect NOCs from relevant authorities (such as the municipal corporation, society, and utility providers) to ensure there are no objections or pending dues on the property.
  • Mutation Certificate
    Check the mutation certificate to confirm that the property is recorded in the seller’s name in municipal records. This is important for property tax purposes and legal recognition.
  • Physical Site Visit
    Conduct a site visit to verify the property’s physical condition and ensure it matches the details in the documents. This helps identify discrepancies or unauthorized constructions.
  • Cross-Check with Local Authorities
    Visit the local municipal office, land record office, or registrar’s office to verify the authenticity of documents and check for any legal disputes or irregularities.
  • Hire a Property Lawyer
    Engage an experienced property lawyer or title search specialist in Kolkata. They can conduct a thorough legal due diligence, review all documents, trace the chain of ownership, and confirm compliance with all local laws.
  • RERA Compliance
    For newer properties, check if the project and developer are registered with the West Bengal Real Estate Regulatory Authority (RERA) to ensure transparency and adherence to legal standards.
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How do you confirm that all construction permits are for Kolkata flats?

  • Verify the Approved Building Plan
    Check that the flat’s construction has been sanctioned by the Kolkata Municipal Corporation (KMC) or the relevant Urban Local Body (ULB). You can search the status of building plan proposals on the KMC portal or through the Online Building Plan Approval System (OBPAS).
  • Check the Building Sanction/Permit
    Ensure that the builder or previous owner obtained a valid building sanction or construction permit. This document confirms that the building was allowed to be constructed as per the sanctioned plans and local zoning laws.
  • Completion Certificate
    After construction, the builder must apply for a completion certificate from the municipal authorities. This certificate, as per Section 403 of the Kolkata Municipal Corporation Act and the West Bengal Housing Industry Regulation Act, certifies that the building has been constructed according to the approved plan and specifications. Without this certificate, the building is not considered legally complete and can be subject to penalties or even eviction.
  • Occupancy Certificate
    Once the completion certificate is secured, the owner or builder must apply for an occupancy certificate. This certificate is issued by the municipal authority after verifying that the building is fit for occupation and complies with all safety and building norms. The process involves submitting the completion certificate, NOCs, and other supporting documents through the official portal, followed by inspection and approval by the authorities.
  • No Objection Certificates (NOCs)
    Confirm that all necessary NOCs from fire, water, electricity, and environmental authorities have been obtained. These are often prerequisites for both completion and occupancy certificates.
  • Supporting Documentation and Consultant Declaration
    For both completion and occupancy certificates, supporting documents and a declaration by a licensed architect or building surveyor are required, confirming that the construction matches the sanctioned plan and meets all legal standards.
  • Cross-Verification
    Use the KMC and OBPAS online portals to cross-check the status of building permits, sanctions, and certificates. This ensures authenticity and up-to-date compliance.
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FAQ

1. What documents are required for buying a resale flat in Kolkata?

You need the original sale deed, chain of ownership documents, approved building plan, completion and occupancy certificate, encumbrance certificate, and a no dues certificate from the housing society.


2. Is a sale agreement necessary before registering the flat?

Yes, the sale agreement is a legally binding document outlining the price, payment terms, and conditions. It must be signed before executing the final sale deed and registration.


3. How much is the stamp duty for a resale flat in Kolkata?

Stamp duty in Kolkata is generally 6-7% of the property value, depending on the location and the buyer’s gender. Registration charges are typically 1%.


4. Do I need to get the flat mutated after purchase?

Yes, mutation updates the ownership in municipal records and is necessary for property tax payments and legal ownership proof.


Absolutely. The best real estate company in Kolkata, like Casa Realty, can help with document verification, sale agreement drafting, loan coordination, registration, and society transfer.

Final Thoughts

Buying a resale flat in Kolkata is an excellent option for buyers seeking affordability, better location, and immediate possession. But the legal procedures involved can be overwhelming without proper guidance.

At Casa Realty, the best real estate company in Kolkata, we ensure our clients face zero hassle during their home-buying journey. From document verification to registration and society transfer, we handle everything for you.

If you’re planning to invest in a resale flat in Kolkata, connect with Casa Realty today and make your purchase a legally sound and stress-free process.