In a Dadar housing society last year, a family sold their tenanted flat to a buyer who believed he was purchasing a home in a shiny new tower promised by a redevelopment deal. Two years on, the old building is demolished, the new one is a slow rising skeleton, and the buyer is learning that the document that actually protects the flat he paid for is not the brochure or even the MahaRERA page, but a registered agreement he never asked to see. Redevelopment is where Mumbai builds its future, and also where buyers most often misunderstand what they are really buying.

The short answer. When you buy into a Mumbai redevelopment project, the Permanent Alternate Accommodation Agreement, or PAAA, is the legally binding contract between the developer and each flat owner that secures the right to a specific new flat, its carpet area, the transit rent during construction, and the expected possession date. It must be registered, and the stamp duty for registering it is nominal, reported to be around 100 rupees. The trade-off buyers underrate is this: MahaRERA registration gives you disclosure and a complaint route, but it does not guarantee construction success, and it does not validate land title or the developer's solvency. Those remain your checks. Read the registered agreements before you pay, not after.

What is a redevelopment purchase actually buying?

A redevelopment purchase is different from buying a ready flat or a fresh launch, because you are buying a promise attached to a project that involves an existing society, its members, and a developer, all at once. In Mumbai, an old society hands its land to a developer who demolishes the existing building and constructs a new one, giving existing members new flats and often selling additional free sale flats to outside buyers to fund the project. Where you sit in that structure decides what protects you. A rehab member relies on the individual agreement securing the replacement flat, while an outside buyer of a free sale unit relies on the sale agreement and the project's MahaRERA registration. Knowing which category you fall into is the first question, because the two are protected by different documents and the wrong assumption is expensive. An outside buyer who thinks the rehab members' agreement protects him, or a member who assumes the free sale buyers' MahaRERA cover extends to him, is each leaning on a document that was never written for their position. If you are buying a free sale flat, verifying the project on the state portal is essential, which our guide to the MahaRERA MahaCRITI portal walks through.

Why is the PAAA the document that really protects you?

The Permanent Alternate Accommodation Agreement is the legal backbone of a redevelopment for the flat owner. According to the redevelopment guidance published by The Propertist, the PAAA is a legally binding contract between the developer and each individual flat owner that ensures the owner receives a permanent replacement flat once redevelopment is complete. It specifies the exact flat number assigned in the new development, the carpet area and layout of the new apartment, the transit rent the developer will pay during construction, the expected possession date, and the payment structure for any extra amenities beyond the original flat. Crucially, it must be registered, and the stamp duty for registering a PAAA is reported to be nominal, around 100 rupees, which gives you legal proof that prevents future disputes. A buyer stepping into a rehab member's shoes should insist on seeing this registered agreement, because it, not a verbal assurance, is what a court would read.

What does MahaRERA guarantee, and what does it not?

This is where the most expensive misunderstandings live. MahaRERA registration applies when new saleable units are offered to outside buyers, and it compels the developer to disclose project details and gives allottees a complaint route. What it does not do is equally important. The Propertist and other redevelopment commentary are clear that MahaRERA guarantees disclosure and compensation, not construction success, and that it does not validate land titles or a builder's solvency, both of which remain the buyer's responsibility. Many buyers assume a MahaRERA number means the project is safe and possession is assured. It does not. It means the developer has registered and disclosed, which is valuable but partial. Treat the MahaRERA page as one verified layer, then do your own title and developer diligence on top, exactly as you would for any purchase. The practical failure mode is a buyer who reads the MahaRERA registration as a warranty of delivery and stops checking. In a redevelopment, delivery depends on the developer clearing demolition, funding construction through to completion, and honouring the individual agreements, none of which a registration number can force. A developer with several stalled projects can still hold a valid MahaRERA entry for the one in front of you, so a background scan of the developer's other Mumbai projects, their delays, and any complaints on the portal tells you more about your real risk than the certificate alone.

What consent and safeguards should the redevelopment already have?

A redevelopment that reaches you should already carry certain society level safeguards, and their absence is a warning. Maharashtra's redevelopment norms are commonly cited as requiring a defined majority of member consent, often quoted as 51 percent, along with a developer bank guarantee, RERA registration of saleable units, and a registered development agreement between the society and the developer. Because these thresholds and procedures are set out in government resolutions that are periodically updated, confirm the current requirements in the applicable Maharashtra resolution or with a property lawyer rather than taking a developer's summary at face value. The development agreement and the individual accommodation agreements should clearly state carpet areas, rent, timelines, and penalties for delay. When a developer pushes to merge the society agreement and the individual PAAA into a single document, ask why, because separating them keeps individual rights from being diluted into collective ones. A registered development agreement also matters because it fixes the developer's obligations to the society on the public record, which is far harder to quietly renegotiate later than an unregistered understanding sitting in a drawer.

How does a redevelopment buy compare with a ready or fresh launch flat?

Each route carries a different risk shape, and honest guidance names the trade-offs rather than selling the upside. The table sets the three side by side on the dimensions a buyer feels.

What should your redevelopment buyer checklist cover?

1. Establish whether you are buying a rehab member's flat or a free sale unit, since each is protected differently.
2. Insist on seeing the registered Permanent Alternate Accommodation Agreement or sale agreement before paying anything.
3. Confirm the agreement states the exact flat, carpet area, transit rent, possession date, and delay penalties.
4. Verify the project's MahaRERA registration for any saleable units on the state portal.
5. Do independent title and developer solvency checks, since MahaRERA does not validate either.
6. Confirm society consent, the bank guarantee, and a registered development agreement exist as required.
7. Have a property lawyer read the development agreement and your individual agreement before you commit.

Is a redevelopment flat a smart buy or a risk you should avoid?

Neither label fits every case, and the honest answer is that a redevelopment flat is a higher diligence purchase that can reward the careful and punish the casual. The upside is real: you often pay less than for an equivalent fresh launch in the same pocket, and you get a new building with modern amenities in an established, well located neighbourhood that a greenfield project cannot offer. The risk is equally real: your possession is tied to a project that must clear demolition, construction, and the developer's own finances, and your protection depends on documents you must actually read. A buyer who verifies the registered agreements, checks title and solvency independently, and treats the MahaRERA number as a floor rather than a guarantee is buying with open eyes. A buyer who trusts the brochure alone, and skips the registered agreements and the independent title check, is not buying a home, but a hope dressed up as one. The society structure behind it, including matters like a completed deemed conveyance, is part of the same picture.

Is the PAAA compulsory when buying a redevelopment flat in Mumbai?

For a rehab member's replacement flat, the Permanent Alternate Accommodation Agreement is the core protective document and must be registered. According to The Propertist, it secures the specific new flat, carpet area, transit rent, and possession date, with a nominal registration stamp duty around 100 rupees. A buyer taking that position should see the registered agreement before paying anything.

Does MahaRERA registration guarantee my redevelopment flat will be built?

No. MahaRERA registration compels disclosure and gives a complaint route, but redevelopment guidance is clear that it guarantees disclosure and compensation, not construction success. It also does not validate land title or the developer's solvency. Verify the MahaRERA entry, then run your own title and developer checks on top before committing money.

What is transit rent in a Mumbai redevelopment?

Transit rent is the amount the developer agrees to pay society members for temporary accommodation during construction, so residents are not left bearing housing costs while their building is rebuilt. The PAAA specifies this amount and period. Confirm the figure, the payment schedule, and the penalty if the developer stops paying before you rely on it.

Should the society agreement and my PAAA be one document?

Keeping them separate is generally safer. Redevelopment commentary warns that merging the society development agreement and the individual PAAA can dilute individual rights into collective ones, since society interests and member interests are not identical. Ask a property lawyer to review both documents, and be cautious if a developer pushes to combine them into a single agreement.

Last updated 2026-07-11. PropNewz Team.