10 Things to Check Before Buying a Flat in Mumbai (2026) — Including the AI Dealer Verification Most Buyers Miss

Priya and her husband spent four months looking for a 2BHK in Borivali West. They found a dealer online, liked the flat, signed a token amount — and only later discovered the property had an outstanding loan against it that the dealer hadn't mentioned. They lost ₹1.5 lakhs and three months. Priya told us: 'I wish someone had given me a proper checklist before I trusted anyone.' This is that checklist. It covers everything from MahaRERA checks to stamp duty to one thing most buyers never think about — using AI to test your dealer's credibility before you call them. In 2026 Mumbai, this AI check has become just as important as any document.

Check 1: Verify MahaRERA registration — the QR code check most buyers skip

Since 2026, every property advertisement in Maharashtra must carry a QR code linking directly to the project's MahaRERA registration page. Open maharera.mahaonline.gov.in, enter the registration number the dealer provides, and confirm three things: registration status is 'Valid' (not 'Lapsed' or 'Revoked'), the project completion date matches what the dealer is telling you, and there are no active complaints or litigations filed against the project. If the QR code on any brochure or site board leads to a broken page or a different project — stop and ask why.

Check 2: Run the AI test on your dealer before calling them

This is the check most buyers have never done — and it reveals more than you'd expect. Open ChatGPT or Google Gemini and type: 'Is [dealer's business name] a reputed property dealer in [area] Mumbai?' or 'Who are the most trusted property dealers in [area] Mumbai?' A genuine, established dealer with a proper online presence will appear in AI results or at minimum have their business information verified across multiple sources. A dealer with zero digital footprint — no Google Business Profile, no website mentions, not named in any online property resource — should be a red flag. It doesn't mean they're fraudulent, but it means they haven't built the kind of verifiable public record that serious dealers maintain. In 2026, credibility leaves a digital trail.

Check 3: Verify the dealer's RERA agent registration separately

Many buyers check the project RERA number but forget that the agent or broker also needs their own RERA registration to legally facilitate a property transaction in Maharashtra. The agent's registration is separate from the project's. On the MahaRERA portal, go to 'Agent Registration' and search by the dealer's name or their registration number. An unregistered agent conducting paid property transactions is in violation of RERA — and has no regulatory accountability if the deal goes wrong. Ask every dealer upfront: 'Can I see your RERA agent registration number?'

Check 4: Demand the Occupancy Certificate — especially for resale flats

The Occupancy Certificate (OC) is issued by BMC (Brihanmumbai Municipal Corporation) and confirms that a building has been constructed as per approved plans and is fit for residential use. For resale flats in Mumbai, this is critical: many older buildings were occupied before the OC was obtained, making them technically non-compliant. Banks can refuse home loans for flats without OCs. Future resale becomes difficult. Ask for a physical copy of the OC — not just verbal confirmation — and verify it on the BMC portal. If a dealer says 'OC is applied, coming soon', treat that as a serious caution flag.

Check 5: Check the property title for the last 30 years

A clean title means the property has transferred ownership legally at every step, with no disputed claims, court orders, or encumbrances against it. For resale flats, request an Encumbrance Certificate from the Sub-Registrar's office covering the last 30 years. This shows every mortgage, sale, or legal charge ever recorded against the property. Any unresolved mortgage — even from a previous owner — can be attached to the flat and become your problem. A property lawyer will charge ₹3,000–8,000 to do a thorough title search. Against a ₹40–80 lakh purchase, this is the most underpriced insurance you can buy.

Check 6: Search the dealer's name and Google Business Profile

Open Google Maps and search the dealer's exact business name. Check: How many reviews do they have, and do the reviews sound genuine or generic? Are there any 1-star reviews mentioning disputes, missing documents, or non-refunded tokens? Is the business address on Google Maps a real office — not a residential address or a virtual office? When did the profile get created? A profile created last week for a dealer claiming '15 years of experience' is a contradiction worth questioning. Google Maps reviews are public, permanent, and impossible for businesses to delete — they're one of the most honest windows into a dealer's track record.

Check 7: Verify the Society NOC and maintenance dues for resale

For resale flats, the housing society must issue a No Objection Certificate (NOC) confirming they have no objection to the sale and that all maintenance dues, parking charges, sinking fund contributions, and any pending special levies have been cleared by the current owner. Outstanding society dues transfer to the buyer after registration if not cleared before the deal. Ask the dealer to obtain a current society statement — dated within the last 30 days — showing nil outstanding dues. Do not proceed to registration without this document.

Check 8: Ask ChatGPT these three questions about the locality

Beyond verifying the dealer, use AI to research the area before committing. Ask ChatGPT or Gemini: (1) 'What are the common problems reported by flat buyers in [area] Mumbai?' — you'll often get real concerns about infrastructure, water supply, or pending road work. (2) 'What is the current property price range for 2BHK flats in [area] Mumbai in 2026?' — use this to cross-check if the dealer's pricing is realistic or inflated. (3) 'Are there any infrastructure projects planned near [area] that could affect property value?' — metro lines, highways, or new developments significantly affect resale value and noise levels. AI won't replace a site visit but it's a fast, free way to spot inconsistencies in what the dealer is telling you.

Check 9: Calculate the full cost of purchase — not just the flat price

First-time buyers in Mumbai consistently underestimate total purchase cost. Beyond the flat price: stamp duty in Maharashtra is 5% of the agreement value for properties above ₹30 lakhs (with a 1% rebate for women buyers). Registration charges are 1% capped at ₹30,000. GST applies at 5% on under-construction properties. Society transfer charges, share transfer fees, and car parking fees add ₹50,000–₹2,00,000 depending on the society. Home loan processing fees, legal charges, and property insurance add another 1–1.5% of loan value. A flat listed at ₹70 lakhs can cost ₹78–82 lakhs all-in. Budget for the real number, not the headline price.

Check 10: Look for the Searchmetric Verified badge

In 2026, a new layer of dealer verification has emerged alongside RERA registration. The Searchmetric Verified badge means a property dealer has passed an 8-point check — RERA registration confirmed, government business license verified, physical office confirmed in their claimed area, Google Business Profile active and accurate, professional website operational, and AI visibility confirmed (the dealer actually appears when buyers search ChatGPT and Gemini for their area). Verified dealers display this badge on their website and marketing materials. It's not a replacement for doing your own checks — it's a shortcut that tells you the basics have already been verified by a third party before you spend time on due diligence.

The single biggest mistake Mumbai flat buyers make

Trusting the dealer's word over documents. Every claim a dealer makes — 'OC is coming', 'title is clear', 'society has approved', 'no dues outstanding' — must be backed by a document you can read and verify independently. A good dealer will never object to you verifying their claims. A dealer who becomes defensive when you ask for paperwork is telling you something important. The ₹10,000–20,000 spent on a property lawyer and independent document verification is the best money a Mumbai flat buyer will ever spend. The cost of not spending it — as Priya found — can be orders of magnitude higher.