The builder-buyer agreement (BBA) — also called the sale agreement or agreement to sell — is the legally binding contract between a home buyer and a developer that governs every aspect of the transaction: what you’re buying, what it costs, when you get possession, and what happens when things go wrong. It is typically 60-120 pages long, written in dense legal language, and handed to a buyer at the developer’s sales office with an implicit pressure to sign quickly.
Most buyers sign. Most haven’t read it carefully. Most don’t know which clauses to challenge and which to accept. The result — delayed possession, disputed refunds, unilateral modifications to the floor plan, and charges that were never mentioned during the booking conversation — has been the defining grievance pattern in Indian residential real estate for three decades.
RERA (Real Estate Regulation and Development Act, 2016) has materially improved the buyer’s position by mandating disclosure, standardising certain terms, and creating an adjudicatory mechanism for disputes. But RERA does not eliminate the need to read and understand the BBA. It creates the framework within which the BBA must operate. The specific terms — particularly on compensation, timelines, and modification rights — still vary significantly between developers, and the terms you accept at signing are the terms that govern your claim if something goes wrong.
| RERA mandates registration of all projects above 500 sq m or 8+ units before any booking is accepted. A builder-buyer agreement cannot override RERA’s minimum protections — but it can define specific terms above RERA’s floor that affect your rights significantly. The clauses below are where the real variation lives. Source: Real Estate (Regulation and Development) Act, 2016; Ministry of Housing and Urban Affairs. |
Clause 1 — Possession Date and the Delay Penalty
The most contested clause in any builder-buyer agreement is the possession date — and more specifically, what happens when the developer fails to deliver on time. Under RERA Section 18, a builder who fails to deliver possession on the promised date must pay the buyer interest at the rate of SBI’s marginal cost of lending rate (MCLR) plus 2% for every month of delay. The buyer can also withdraw from the project and claim a full refund with the same interest.
| WHAT TO CHECK IN THE POSSESSION CLAUSE Is there a grace period? → Most builders include a 6-12 month grace period after the stated possession date before the delay penalty kicks in. RERA permits a reasonable grace period. Check the exact months stated — some builders write 18-24 month grace periods, which is significantly above what most RERA state rules would consider reasonable. Is the delay penalty lower than RERA mandates? → Some pre-RERA or poorly drafted agreements specify a delay compensation rate (e.g., ₹5/sq ft/month or ₹10,000/month flat) that is far below RERA’s interest formula. These clauses are unenforceable under RERA — RERA overrides the contractual rate — but having them in the agreement signals a developer who tried to limit their exposure. Does the date match the RERA portal? → The possession date in the BBA must match the date declared on the state RERA portal (e.g., MahaRERA, UP-RERA, RERA Karnataka). If there is a discrepancy, the RERA-registered date governs for the purpose of penalty calculations. Always verify the BBA date against the RERA portal before signing. Force majeure scope → Most BBAs include a force majeure clause that allows the developer to extend the possession date if events outside their control delay construction. Post-2020, force majeure clauses have become broader. Check whether the developer’s version lists specific, narrow triggers (pandemic, natural disaster, government order) or uses sweeping language that effectively gives them a unilateral extension right. |
Clause 2 — Payment Schedule and Linked Construction Milestones
A builder-buyer agreement typically specifies when and how much you pay — either on a time-based schedule (down payment + EMIs regardless of construction stage) or a construction-linked plan (payments tied to specific construction milestones). The two are fundamentally different in terms of buyer protection.
| Construction-linked plans (CLP) offer better buyer protection: you pay as floors are built, so a stalled project limits your exposure. Time-based plans front-load payment regardless of construction progress, maximising the developer’s cash flow but maximising your risk if the project stalls. RERA recommends CLPs. If a developer is offering a pure time-based schedule on an under-construction project, ask why they need the cash before the floors are built — that question is itself diagnostic. |
Check: Is each payment milestone defined by a specific, verifiable construction event (e.g., “completion of 5th floor slab” not “at the start of interior finishing”)? Is there a mechanism to verify milestone completion independently before releasing the next tranche?
Clause 3 — Super Built-Up Area, Carpet Area, and the Loading Factor
Under RERA, all project marketing must disclose carpet area — the area within the walls of your apartment that you actually occupy — and pricing must be on carpet area. However, the total price in a builder-buyer agreement is often calculated on super built-up area (SBA), which includes a loading factor for common areas, lobbies, lifts, walls, and other shared spaces. The loading factor typically ranges from 15% to 40% depending on the developer and project type.
What to check: Does the BBA specify both carpet area and super built-up area clearly? Is the loading factor disclosed as a percentage? Has the carpet area been cross-checked against the RERA registration for that unit? Under Section 12 of RERA, if the developer delivers less carpet area than specified, the buyer is entitled to a proportionate reduction in sale price or a refund. But you can only enforce this if the carpet area was clearly specified in your agreement.
Clause 4 — Specifications, Amenities, and Modification Rights
The BBA will contain a specifications schedule listing the flooring, fittings, fixtures, external finishes, and amenities (club, pool, gym, landscaping) that constitute the product you are buying. It will also, typically, contain a clause granting the developer the right to “make minor modifications” to specifications if required.
“Minor modifications” is where significant disputes originate. Buyers have found that granite in the brochure became vitrified tile at possession, that the promised club facility was reduced in size, or that the swimming pool was replaced by a smaller feature. Under RERA Section 14, a developer cannot make any structural or specification changes without the consent of two-thirds of the allottees. But this protection only activates after a significant number of units have been sold and allottees are organised enough to object collectively.
What to check: Is the specifications schedule annexed to the BBA as a schedule and incorporated by reference? Is the modification rights clause limited to minor structural adjustments or does it extend to finishing specifications and amenities? If the latter — negotiate or flag the risk.
Clause 5 — Cancellation and Refund Terms
| Scenario | What RERA Provides | What to Check in the BBA |
|---|---|---|
| Buyer-initiated cancellation | Developer may deduct booking amount; rest refundable within 45 days | What % is defined as “booking amount”? What is the deduction ceiling? |
| Developer delays beyond agreed threshold | RERA S.18: full refund + MCLR+2% interest from date of payment | Does the BBA try to limit the refund or interest rate below RERA? |
| Payment default by buyer | Developer may charge interest; after due process, may cancel | What is the interest rate on defaults? What is the cure period before cancellation? |
Source: Real Estate (Regulation and Development) Act, 2016, Sections 12, 14, 18, 19.
Clause 6 — Additional Charges Not in the Base Price
The base sale price in a developer’s brochure is rarely the total amount you pay. The BBA will contain — often in a schedule deep in the document — a list of additional charges that are payable separately. Common items include: car parking (priced separately), infrastructure development charges (IDC/EDC — government levies passed through to buyers), maintenance deposit (often 2-3 years upfront), club membership fee, power backup installation charges, and GST (5% on under-construction properties above affordable housing threshold).
| The practical check: before signing, ask the developer for the complete “cost sheet” — the full breakup of every amount payable from booking through possession. A reputable developer provides this immediately. If the salesperson redirects to the brochure price, the charges schedule in the BBA will contain surprises. The BBA itself should match the cost sheet; if it doesn’t, the BBA governs. |
Clause 7 — Transfer and Assignment Rights
Can you sell your under-construction property to someone else before possession? The BBA’s transfer clause governs this. Some developers allow transfers after a specified period with an administration fee. Others restrict transfers entirely until possession, or charge a transfer fee of 2-5% of the sale price. For investors, this clause determines whether the asset is liquid during the construction period — which in India can be 3-7 years. Read: Before You Show the Property: The Verification Checklist Every Broker Should Follow.
Clause 8 — Dispute Resolution Mechanism
Post-RERA, buyers are entitled to file complaints with their state RERA authority for most disputes related to an under-construction project. The BBA cannot legally override this right. But developers sometimes include arbitration clauses or exclusive jurisdiction clauses that, while unenforceable for RERA-governed disputes, can create confusion and pressure a buyer toward a slower, more expensive process. What to check: If the BBA mandates arbitration for all disputes, this may still be overridden for RERA-covered complaints — consult a property lawyer.
Sirf Broker POV
The builder-buyer agreement is routinely treated as a formality in India’s residential real estate market. The developer’s legal team has spent years optimising it. The buyer has 48 hours and no legal support. This asymmetry produces agreements that are technically RERA-compliant but structurally tilted toward the developer on every margin — in the grace period length, the additional charges schedule, the modification rights scope, and the cancellation penalty quantum.
The broker who advises a buyer to read and understand the BBA before signing is adding genuine advisory value — the kind that protects a client’s crores rather than just closing a commission. But that advisory capability requires knowing what to look for. The eight clauses above are not an exhaustive legal checklist. They are the high-leverage points: the clauses where the developer’s version is most likely to differ from what the buyer expects, and where the difference has the largest financial consequence.
Our specific position: any buyer committing more than ₹50 lakh to an under-construction project should have a property lawyer review the BBA before signing — not after booking. A property lawyer review costs ₹5,000-₹25,000 depending on document complexity. Against a ₹50 lakh-₹5 crore commitment, that is the cheapest risk management available. The broker who makes this recommendation is the broker the buyer remembers when they refer the next client.
Conclusion
A builder-buyer agreement governs your entire under-construction property purchase. The eight clauses that most determine your risk: possession date and delay penalty, payment schedule type, carpet area vs. super built-up area, specifications and modification rights, cancellation and refund terms, additional charges beyond base price, transfer and assignment rights, and dispute resolution mechanism. RERA provides a floor — but the specific terms above that floor are what you’re signing. Read them.
Frequently Asked Questions
1. What is a builder-buyer agreement (BBA) in India?
A builder-buyer agreement is the legally binding contract between a home buyer and a developer for an under-construction or newly completed property. It specifies what the buyer is purchasing, the price, payment schedule, possession date, specifications, and rights of both parties. Under RERA, the BBA must be registered and conform to minimum buyer protection standards.
2. Is the builder-buyer agreement the same as the sale deed?
No. The BBA (agreement to sell) is signed at booking, creating an obligation to transact. The sale deed transfers legal title at possession after OC is obtained and is registered at the sub-registrar’s office. Until the sale deed is registered, legal title remains with the developer.
3. Can a builder-buyer agreement be changed after signing?
Once signed, it can only be amended by mutual written consent. Under RERA Section 14, a developer cannot make structural changes or change amenities without consent of two-thirds of allottees. However, modification rights clauses may grant developers discretion for “minor” changes — which is exactly why this clause requires review before signing.
4. What protection does RERA give home buyers in the builder-buyer agreement?
RERA minimums that cannot be waived: project must be RERA-registered before bookings; delay compensation at MCLR+2% per month; buyers can exit and claim full refund with interest if developer delays; carpet area must be specified; no changes to plans without buyer consent. The BBA defines specific terms within this framework.
5. What is the difference between carpet area and super built-up area?
Carpet area is the space within your apartment walls that you actually use. Super built-up area adds a loading factor (15-40%) for common areas, lobbies, lifts, and shared spaces. RERA mandates carpet area pricing disclosure. Always verify the carpet area in your BBA against the RERA portal registration for that unit.
6. What additional charges should I look for beyond the base price?
Car parking (₹3-10 lakh separately), maintenance deposit (2-3 years upfront), club membership, power backup installation, infrastructure development charges (IDC/EDC), and GST (5% on under-construction properties above affordable housing threshold). Always request a complete cost sheet before signing the BBA.
Sources and References
- Real Estate (Regulation and Development) Act, 2016 — Sections 12, 13, 14, 18, 19. legislative.gov.in
- Ministry of Housing and Urban Affairs — RERA Guidelines — mohua.gov.in
- MahaRERA — Model Agreement for Sale — maharerait.maharashtra.gov.in
Disclaimer
| This article is published by Sirf Broker for educational and informational purposes only. This is not legal advice. Consult a qualified property lawyer before signing any builder-buyer agreement, particularly for transactions above ₹50 lakh. |