Builder Buyer Agreement 2026: Clauses to Check Before You Sign
The builder-buyer agreement is the most important document you sign when you buy an under-construction flat. It decides your rights if the builder delays, changes the plan, or adds charges later. Most buyers sign it without reading it. This guide shows you the exact clauses to check in a builder-buyer agreement in 2026, so the deal protects you, not only the builder.
Key takeaways
- The builder-buyer agreement (BBA) is the contract between you and the developer for an under-construction home.
- Under RERA, the agreement must follow a fair, standard format, but builders still slip in one-sided clauses.
- Check the possession date, the penalty for delay, the payment plan, and the carpet area carefully.
- Watch for hidden charges, one-sided penalty terms, and a weak refund clause.
- Never sign until you have read every clause, ideally with a lawyer.
What a builder-buyer agreement is
When you book an under-construction flat, the builder gives you a builder-buyer agreement to sign. It sets out the price, the payment schedule, the possession date, the specifications, and the rights and duties of both sides. It is legally binding. If a dispute arises later, this is the document a court or RERA will look at. So the terms in it matter far more than the brochure or the salesperson's promises.
Under RERA, the agreement must be fair and follow a prescribed model in most states. But builders often add clauses that favour them. Your job is to spot those before you sign.
The clauses to check
1. Possession date
Find the exact date the builder promises possession. It must be a clear date, not a vague phrase. This date is the basis for any delay penalty, so it is the single most important line in the agreement.
2. Delay penalty
Check what the builder pays you if possession is late. Under RERA it should be a fair rate, similar to what you pay the builder for a late payment. Beware of a clause where the builder pays a tiny penalty but charges you heavily for any delay on your side. That is a one-sided term.
3. Payment plan
See how your payments are linked to construction stages. A construction-linked plan protects you, because you pay as the building rises. Be careful with a plan that front-loads most of the money early, before much is built.
4. Carpet area
The agreement must state the carpet area, the real usable area, as RERA requires. Check that the price is tied to carpet area, not on a larger super area. Our carpet vs super area guide explains the difference.
5. Specifications
The agreement should list the fittings, flooring, and materials promised. This protects you from a downgrade at handover.
6. Refund and cancellation
Check what happens if you cancel, or if the project is cancelled. A fair clause returns your money with reasonable deductions. A harsh clause lets the builder keep a large share.
Red flags to watch for
| Red flag | Why it is a problem |
|---|---|
| Vague possession date | No clear date means no enforceable delay penalty |
| One-sided penalties | Builder pays little for delay, you pay a lot |
| Hidden charges | Club, parking, maintenance added later, not in the price |
| Price on super area | You pay for area you cannot use |
| Weak refund clause | You lose most of your money on cancellation |
| Right to change the plan | Builder can alter the layout or size without your consent |
Charges to confirm before signing
Ask for the full, all-in cost in writing. The base price is only part of it. Common extra charges include the club membership, covered parking, power backup, external and internal development charges, and one-time maintenance deposit. Under RERA, many of these should be disclosed upfront. Get the total on paper so there is no surprise at possession. Our 2 BHK cost breakdown shows how these add up.
How RERA protects you
RERA changed the balance in the buyer's favour. Builders must register the project, disclose the plan and timeline, and cannot take more than a small advance without a signed agreement. The agreement must be fair and follow the model form in most states. If a builder inserts a clearly one-sided clause, you can challenge it before RERA. So two things help you: buy only in a RERA-registered project, and read the agreement against the RERA model. Our RERA registration guide shows how to verify the project first.
Before you sign
- Read every clause. Do not rely on the brochure or verbal promises.
- Get a lawyer to review it. The fee is small against the flat's price.
- Match the agreement to the RERA-registered details of the project.
- Confirm the possession date, delay penalty, carpet area, and all-in price in writing.
- Keep a signed copy safely with your other papers.
More clauses that decide your rights
7. Force majeure
This clause lets the builder extend the timeline for events beyond his control, like a natural disaster or a government ban. It is fair in principle, but some builders write it so broadly that almost any delay can be blamed on force majeure. Read it closely, and make sure it covers only genuine, unavoidable events, not routine construction slippage.
8. Termination and forfeiture
Check what the builder can do if you miss a payment. A fair clause gives you notice and a chance to pay before any action. A harsh clause lets the builder cancel your booking and forfeit a large part of your money on a single delay. Balance this against the penalty the builder pays you for his own delay. The two should be roughly even.
9. Interest on both sides
The agreement should charge interest at the same rate to both parties. If you pay late, you are charged interest. If the builder delivers late, he should pay you interest at the same rate. When the builder's rate is far lower than yours, the clause is one-sided.
10. Assignment and transfer
If you may want to sell the flat before possession, check whether the agreement allows you to transfer it, and what fee the builder charges for it. A high transfer fee can trap you.
Common builder tricks to watch for
- Selling on super area. The brochure quotes a big super area, but your usable carpet area is much smaller. RERA requires pricing on carpet area, so insist on it.
- Charges added at possession. Club, parking, and infrastructure charges appear at the end, not in the base price. Get the all-in cost upfront.
- Verbal promises. A pool, a school, or a park promised by the salesperson but missing from the agreement is not binding. Only what is written counts.
- A vague possession date. Phrases like "expected by" or "tentatively" leave you with no enforceable date. Demand a firm one.
- Changing the layout. A clause that lets the builder alter the plan or your unit's size without consent can shrink what you bought.
What the RERA model agreement includes
Most states have a model builder-buyer agreement under RERA that sets a fair baseline. It fixes the carpet area basis, a clear possession date, equal interest for delay on both sides, a defined payment schedule, and limits on one-sided cancellation. When a builder gives you his own agreement, compare it against the state's RERA model. Any clause that is worse for you than the model is worth questioning. You can raise it with the builder, and if needed, before the RERA authority. This is why buying in a RERA-registered project matters so much, it gives you a fair template and a place to complain.
A quick example
Anil booked a flat and almost signed an agreement that promised possession "tentatively within 42 months" with a builder delay penalty of ₹5 per square foot a month, while charging him 18% interest for any late payment. His lawyer flagged both. They got the date fixed to a firm calendar month and the delay interest matched to what Anil would pay. Two years later, when the project ran late, that fair clause meant Anil received real compensation instead of a token amount. A few hours of legal review protected lakhs.
Frequently asked questions
What is a builder-buyer agreement?
It is the binding contract between you and the developer for an under-construction home, setting the price, payment plan, possession date, specifications, and both sides' rights.
What clauses should I check in a builder-buyer agreement?
The possession date, the delay penalty, the payment plan, the carpet area, the specifications, and the refund and cancellation terms.
Is a builder-buyer agreement mandatory under RERA?
Yes. A builder cannot take more than a small advance without a signed agreement, and the agreement must follow a fair, prescribed format in most states.
Can I change clauses in a builder-buyer agreement?
You can negotiate, especially on one-sided terms, and challenge unfair clauses before RERA. Builders may resist, but a clearly unfair clause is not always enforceable.
Should a lawyer review the agreement?
Yes. A lawyer's review is a small cost against the flat's price and can catch one-sided clauses and hidden charges before you sign.
What is a force majeure clause in a builder agreement?
It lets the builder extend the timeline for events beyond his control, like a natural disaster or a government order. Make sure it covers only genuine, unavoidable events, not routine delays.
Should the price be on carpet area or super area?
On carpet area, the real usable space, as RERA requires. A price quoted on a larger super area means you pay for space you cannot use.
Can I sell an under-construction flat before possession?
Often yes, but check the assignment clause and the transfer fee the builder charges. A high fee can make an early exit costly.
Can I negotiate the builder-buyer agreement?
You can, especially on one-sided clauses like the delay penalty, the possession date, and hidden charges. Builders may resist, but a clearly unfair term is not always enforceable, and raising it before signing is your best moment of leverage.
What to do after you sign
Signing is not the end of your job. Keep the process tight through to possession.
- Store the signed, stamped agreement safely with your other papers.
- Track construction against the promised stages, and pay only as each stage is reached.
- Keep every payment receipt and demand letter.
- Watch the possession date, and note any delay in writing so your penalty claim is clean.
- At handover, demand the occupancy certificate before you take the keys. See our OC and CC guide.
Is a builder-buyer agreement the same as a sale deed?
No. The builder-buyer agreement governs the under-construction stage and your booking. The sale deed, executed and registered at possession, is what actually transfers ownership to you.
When do I pay stamp duty on an under-construction flat?
The full stamp duty is paid at the sale deed or conveyance, usually near possession, not at the builder-buyer agreement stage. Budget for it separately from the price.
What if the builder delays possession beyond the agreed date?
Under RERA, you are entitled to the delay compensation set in the agreement, and you can approach the RERA authority if the builder does not pay. A firm possession date is what makes this claim enforceable.
The bottom line
The builder-buyer agreement is where your rights are won or lost. The brochure and the sales pitch mean nothing next to what is written and signed. Read every clause, especially the possession date, the delay penalty, the carpet area, and the refund terms. Compare it against your state's RERA model, and get a lawyer to check it before you sign. A few hours of careful review, and a small legal fee, protect a purchase worth tens of lakhs or more. Buyers who skip this step are the ones who end up with a tiny penalty for a two-year delay, or a pile of charges they never agreed to. Do not be one of them.
Booking an under-construction home in NCR and want the agreement checked before you sign? Tell us the project and we will help you review it. Browse our new launches to start.
