Builder-Buyer Agreement Karnataka: Key Clauses, RERA Rules, and What to Negotiate Before Signing

Published: 12 September 2026 | Updated on: 12 September 2026 | By L K Monu Borkala, CEO & Founder, OneCity Property — 15 years of property consultancy experience and over 20 years in marketing and management at OneCity Technologies Pvt. Ltd.

What Is a Builder-Buyer Agreement?

A builder-buyer agreement (also called a sale agreement for under-construction property, or an agreement for sale) is the contract you sign when booking a flat or villa from a developer. Unlike a sale deed which transfers ownership, this agreement is a promise to sell: the builder promises to construct and deliver the property by a specific date, and you promise to pay the agreed price in instalments linked to construction milestones.

This agreement governs your relationship with the builder for 2-4 years (the typical construction period). Everything from what happens if the builder delays possession to what specifications your flat will have is determined by this document. Once signed and registered, changing its terms requires mutual consent. This is why reviewing and negotiating before signing is critical.

RERA Karnataka: What the Law Requires in Every Agreement

The Real Estate (Regulation and Development) Act, 2016, implemented in Karnataka through K-RERA, mandates specific terms that every builder-buyer agreement must contain. Builders cannot contract out of these requirements, and any clause that contradicts RERA is void:

Carpet area pricing. The agreement must state the price per square foot of carpet area, not super built-up area. This is one of RERA's most important buyer protections because it eliminates the loading factor that builders used to inflate area and price.

Specific possession date. The agreement must include a definite date by which the builder will hand over possession. Vague terms like "approximately 36 months from approval" or "expected completion by 2028" are not RERA-compliant. The date must be a calendar date, with any grace period explicitly stated (maximum 6 months is standard).

Delay penalty at MCLR + 2%. If the builder misses the possession date, the buyer is entitled to interest at the State Bank of India's Marginal Cost of Lending Rate (MCLR) plus 2% per annum on the total amount paid. As of mid-2026, this works out to approximately 10.15% per annum. This rate must be the same for both parties: the builder pays this rate for delays, and the buyer pays the same rate for late payments.

70% escrow requirement. The builder must deposit 70% of all buyer payments into a dedicated escrow account, to be used only for that specific project's construction costs. This prevents builders from diverting your money to other projects or land acquisitions.

5-year structural defect liability. The builder must fix any structural defects or quality issues within 5 years of possession at no cost to the buyer. This covers structural cracks, waterproofing failures, plumbing defects, and electrical issues that arise from construction quality problems.

3% carpet area variation cap. The actual carpet area at delivery cannot differ from the agreed carpet area by more than 3%. If the variation exceeds 3%, the buyer can withdraw from the project with a full refund plus interest. This prevents builders from delivering significantly smaller flats than what was agreed.

12 Clauses You Must Check Before Signing

1. Property description and specifications. The agreement must describe the flat precisely: building number, floor, flat number, carpet area in square feet, UDS allocation, parking slot (covered or open, specific number), and the construction specifications (flooring material, bathroom fittings brand/grade, kitchen platform, doors, windows, painting type). Vague terms like "premium fittings" or "international-standard fixtures" are meaningless without brand names and model numbers.

2. Total price breakdown. The agreement should itemise: base price (rate per sq ft of carpet area x total carpet area), floor rise charges (if applicable), preferred location charges (corner flat, park-facing), car parking cost, amenity charges or club membership, GST (5% for under-construction without ITC, 1% for affordable housing), and any other charges. The total should match what you were quoted. Hidden charges added after signing are a common dispute.

3. Payment schedule linked to construction milestones. Payments should be linked to construction progress: foundation completion, slab completion of your floor, brickwork, plastering, and final handover. Never agree to a front-loaded schedule where 80-90% is paid before the building reaches your floor. A balanced schedule protects you if construction stalls.

4. Possession date with calendar specificity. Look for a specific date, not "36 months from commencement certificate" (because you may not know when the CC was issued). The grace period should be stated and should not exceed 6 months. After the grace period, the delay penalty kicks in automatically.

5. Delay penalty (must be symmetric). RERA requires the same interest rate for builder delays and buyer payment delays. If the agreement states the builder pays 2% for delays but the buyer pays 18% for late payments, this is an unfair asymmetric clause that violates RERA principles. Negotiate symmetry.

6. Cancellation and refund terms. Under RERA, if you withdraw due to the builder's default (delay beyond grace period, misrepresentation), you are entitled to a full refund with interest. If you withdraw voluntarily (change of mind), the builder can deduct a reasonable amount. Check what the agreement defines as "reasonable" and what the refund timeline is. Some builders specify 180 days for refund processing, which is excessive.

7. Force majeure clause. This clause excuses delays caused by events beyond the builder's control: natural disasters, war, government orders, pandemics. Review the scope carefully. Some builders include "labour shortages," "material price increases," or "regulatory delays" as force majeure, which are really business risks the builder should absorb. A well-drafted clause limits force majeure to truly unforeseeable events and caps the extension period.

8. Common areas and amenities. The agreement should list every amenity promised: swimming pool, gym, clubhouse, children's play area, landscaped gardens, jogging track, power backup coverage, and water supply source. If the brochure shows a rooftop infinity pool but the agreement says "amenities as per sanctioned plan," the pool may never materialise and you have no legal recourse.

9. Maintenance charges and corpus fund. Check the monthly maintenance rate per square foot and the one-time corpus fund contribution. Builders typically manage the building for 1-2 years after completion before handing over to the residents' association. The agreement should specify the maintenance rate during the builder-management period, and the corpus fund amount should be proportional to the building size.

10. Transfer and assignment rights. Can you sell or assign the flat before possession? Some agreements restrict pre-possession transfers or charge a hefty transfer fee (2-5% of the sale value). If you might need to exit before possession, negotiate this clause upfront.

11. Governing law and dispute resolution. The agreement should specify Karnataka as the governing jurisdiction and K-RERA as the first forum for disputes. Some builders insert arbitration clauses that name a specific arbitrator (often one friendly to the builder). RERA complaints are faster and cheaper than arbitration for most buyer disputes.

12. Indemnity and representations. The builder should indemnify you against title defects, encumbrances on the land, and third-party claims. The agreement should include the builder's representation that the land title is clear, all approvals are in place, and the project is registered with K-RERA.

Red Flags in Builder-Buyer Agreements

Asymmetric penalties. The builder pays 2% for delay but charges you 18% for late payment. RERA mandates symmetry. Reject any agreement with asymmetric rates.

Unlimited force majeure. If the force majeure clause includes "any cause beyond the builder's control" without specific enumeration, it effectively gives the builder unlimited time extensions. Insist on a defined list and a cap on the total extension period.

Super built-up pricing. If the agreement prices the flat on super built-up area despite RERA requiring carpet area, the builder is not RERA-compliant. This is not just a pricing issue; it signals broader non-compliance.

One-sided cancellation. The builder can cancel for 30-day payment delay, but you cannot cancel even after 12 months of possession delay. This is unfair and potentially RERA-violating.

No RERA registration number. If the agreement does not mention the K-RERA registration number, the project may not be registered. Verify on the Karnataka RERA portal before signing.

Modification rights. Some agreements give the builder the right to modify the layout, floor plan, or specifications "as deemed necessary." This effectively lets the builder deliver something different from what you agreed to buy.

What Happens If the Builder Delays Possession

Under RERA Section 18, you have two options when the builder misses the possession date (after any agreed grace period):

Option A: Continue and claim interest. You stay in the project and claim monthly interest at SBI MCLR + 2% on the total amount paid. This interest accrues from the promised possession date until actual possession. For a Rs 80 lakh flat where you have paid Rs 70 lakh, the monthly compensation is approximately Rs 59,000 at current MCLR rates.

Option B: Withdraw and claim refund. You exit the project entirely and claim a full refund of all amounts paid, with interest at SBI MCLR + 2% from the date of each payment until the refund date.

To enforce either option, file a complaint on the K-RERA portal. Attach the registered agreement, all payment receipts, and any correspondence with the builder. K-RERA complaints are typically heard within 60 days.

Stamp Duty on Builder-Buyer Agreements in Karnataka

Builder-buyer agreements in Karnataka attract stamp duty. The stamp duty rates for sale agreements are lower than for sale deeds: typically 0.1% of the property value or a fixed amount (whichever the Sub-Registrar applies). The agreement must be registered at the Sub-Registrar's Office to have full legal validity. An unregistered agreement has limited evidentiary value in court.

The final sale deed registration at the time of possession attracts the full stamp duty (5% for properties above Rs 45 lakh) and registration fee (2%). The stamp duty paid on the agreement is typically adjusted against the final sale deed duty. Verify this adjustment clause in your agreement.

Documents to Collect Before Signing

Before signing the builder-buyer agreement, collect and verify: the project's K-RERA registration certificate (verify on the RERA portal), the sanctioned building plan from BBMP or BDA, the builder's land title documents and EC, the project brochure (compare every promise against the agreement text), the approved floor plan for your specific flat, the guidance value for the project location, and the builder's track record of past project deliveries (check for RERA complaints against the builder).

Negotiation Tips for Bangalore Buyers

Builders present the agreement as a standard document that cannot be modified. This is not true. Here is what you can negotiate:

Payment schedule: Push for a construction-linked plan where at least 40% of the payment falls after the building reaches your floor level.

Specifications upgrade: If the standard specifications are basic, negotiate upgrades (better flooring, modular kitchen, premium bathroom fittings) in writing within the agreement, not as a verbal promise.

Possession penalty symmetry: If the builder insists on 18% for your late payment, demand the same 18% for their delay (or bring both to MCLR + 2%).

Cancellation refund timeline: Negotiate a 45-day refund timeline instead of the 180 days some builders propose.

Transfer fee waiver: If you might sell before possession, negotiate a waiver or cap on the transfer fee.

After Signing: What Happens Next

Once the agreement is signed and registered, you make payments according to the milestone schedule. The builder provides construction updates (RERA requires quarterly updates on the RERA portal). At completion, the builder obtains the Occupancy Certificate from BBMP, applies for the Khata, and sends you a possession notice.

At possession, verify: the carpet area matches the agreement (within the 3% tolerance), all specifications match, all amenities listed in the agreement are complete, and the OC has been obtained. If the builder demands additional charges not in the agreement (a common tactic), you are within your rights to refuse and escalate to K-RERA.

After taking possession, the builder executes the sale deed, which transfers legal ownership. You then complete BBMP property tax registration, utility connections, and society formation. If the property value exceeds Rs 50 lakh, TDS at 1% applies on the consideration paid to the builder.

Frequently Asked Questions

What is a builder-buyer agreement in Karnataka?

A legally binding contract between a developer and a property buyer that specifies the price, payment schedule, possession date, construction specifications, delay penalties, and both parties' rights and obligations. It must be registered and RERA-compliant for projects registered with K-RERA.

What are the RERA rules for builder-buyer agreements in Karnataka?

RERA mandates: carpet area pricing, specific possession date, delay penalty at SBI MCLR + 2%, 70% escrow on buyer payments, 5-year structural defect liability, 3% carpet area variation cap, and symmetric penalty rates for both parties.

What penalty does a builder pay for delayed possession in Karnataka?

Interest at SBI MCLR + 2% per annum on the total amount paid by the buyer. As of mid-2026, this is approximately 10.15% per annum. The penalty runs from the promised possession date until actual possession or refund.

Can I negotiate clauses in a builder-buyer agreement?

Yes. Payment schedule, specifications, possession penalties, cancellation terms, and transfer fees are all negotiable. The builder drafts the agreement in their favour; your lawyer's job is to restore balance. RERA-mandated terms cannot be waived by either party.

Is stamp duty payable on a builder-buyer agreement in Karnataka?

Yes. Sale agreements attract stamp duty (typically lower than sale deeds). The agreement should be registered at the Sub-Registrar's Office for full legal validity. Stamp duty paid on the agreement is usually adjusted against the final sale deed duty.

What happens if the builder cancels my booking?

Under RERA, the builder cannot cancel without giving you a reasonable opportunity to cure the default (for example, 30 days to make a late payment). If the builder cancels unfairly, file a K-RERA complaint for refund with interest. Unilateral cancellation for minor delays is not RERA-compliant.

Should I register the builder-buyer agreement?

Yes. An unregistered agreement has limited legal value. Registration creates a public record of the transaction and strengthens your position in any future dispute with the builder. The registration cost is minimal compared to the protection it provides.

What documents should I verify before signing?

K-RERA registration, sanctioned building plan, builder's land title and EC, approved floor plan for your flat, project brochure vs agreement comparison, builder's track record, and any RERA complaints filed against the builder.

How to Verify a Builder Before Signing

The agreement is only as good as the builder behind it. Before committing, run these checks on the developer:

K-RERA track record. Search the builder's name on the Karnataka RERA portal. Check how many projects they have registered, how many are completed on time, and whether any complaints have been filed. A builder with multiple delayed projects and unresolved complaints is a high-risk partner regardless of how attractive the price looks.

Past project visits. Visit at least two of the builder's completed projects. Talk to residents about construction quality, maintenance handover, amenity delivery versus brochure promises, and how responsive the builder was to post-possession defect complaints. The 5-year structural warranty is worthless if the builder ignores repair requests.

Financial stability. For listed builders, check their annual reports and debt levels. For private builders, ask about their banking relationships and whether the project has received bank funding approval. A builder who cannot secure project finance from banks may struggle to complete construction.

Land title independent verification. Do not rely on the builder's lawyer's title opinion. Engage your own lawyer to independently verify the builder's title to the project land. Check the mother deed, development agreement (if the builder acquired rights from a landowner), EC on the land, and any pending litigation. This Rs 10,000-15,000 investment can save you from a Rs 80 lakh mistake.

Builder-Buyer Agreement vs Sale Deed: Key Differences

Buyers often confuse these two documents. The builder-buyer agreement is signed at booking and governs the construction period. The sale deed is executed at possession and transfers legal ownership. You cannot skip either. The agreement protects you during construction when the builder holds all the power. The sale deed protects you permanently as the legal proof of ownership.

A critical point: the agreement should explicitly state that the builder will execute the sale deed within a specified period after obtaining the Occupancy Certificate (typically 3-6 months). Some builders delay the sale deed execution for years after giving possession, leaving buyers in legal limbo where they occupy the flat but do not legally own it. This delay affects your ability to resell, mortgage, or even claim full ownership rights.

GST on Under-Construction Properties in Karnataka

Under-construction flats attract GST at 5% (without input tax credit) for properties above Rs 45 lakh, and 1% for affordable housing (up to Rs 45 lakh). The builder-buyer agreement should clearly state whether the quoted price is inclusive or exclusive of GST. Some builders quote "plus GST" prices, which adds 5% to your total cost. Others include GST in the quoted price. Confirm this before comparing prices across projects.

GST is payable only on under-construction properties. Once the builder obtains the Occupancy Certificate, the flat is treated as a completed property and GST no longer applies. If you book a ready-to-move flat (OC already obtained), no GST is charged. This is one financial advantage of buying completed inventory over under-construction units.