Before buying a flat, make sure to check these key documents: Title Deed / Sale Deed – Confirms the seller’s ownership. Encumbrance Certificate – Shows the property is free from legal or monetary issues. Approved Building Plan & Occupancy Certificate – Ensures legal construction and habitability. NOC from Builder / Society – Confirms no pending dues. Payment Receipts & Agreements – Keep proof of all transactions. Also, understand the difference between RK and BHK. A 1 BHK size is ideal for singles or couples, while the standard size of 2 BHK flat gives more space. Knowing the difference between 1BHK and 2BHK helps in choosing the right flat. Conclusion: Verifying paperwork and flat sizes ensures a safe investment and avoids future legal or financial issues.