Checking the Approved Building Plan Before Buying

Rekha had already picked her floor. The fourth-floor apartment had the best cross-ventilation in the building, the broker was friendly, and the price felt fair for the locality. Then her cousin — an engineer — asked one question that stopped the deal cold: "Is the fifth floor on the sanctioned plan?"

Rekha didn't know. Neither, it turned out, did the seller. The building she was about to buy into had five floors standing, but the plan approved by the local authority years earlier showed only four. Somewhere between approval and completion, an extra floor had appeared — without anyone going back to get it sanctioned.

This is one of the most common and least understood risks in Indian real estate: buying into a structure that doesn't match its approved building plan. It doesn't always mean the building is unsafe or the transaction is fraudulent. But it does mean the buyer is taking on a risk that a home loan officer, a resale buyer years later, or a municipal enforcement drive could eventually surface — often at the worst possible time. This guide walks through what an approved building plan actually is, how to obtain and read one, how to compare it to what's actually built, and when it's time to bring in a licensed professional rather than trying to work it out yourself.

What Is an Approved (Sanctioned) Building Plan?

Before any structure goes up in urban India, the landowner or builder is required to submit a building plan to the local sanctioning authority for approval. This plan specifies the number of floors, the built-up area on each floor, setbacks from the plot boundary, parking layout, and how much of the plot is being used relative to what zoning rules allow.

Two terms come up constantly in this context, and buyers should know both:

• FSI/FAR (Floor Space Index / Floor Area Ratio) — the ratio of total built-up area permitted to the plot area. If a plot's FSI is 1.5 and the plot is 2,400 sq ft, the maximum built-up area sanctioned across all floors is 3,600 sq ft. Building beyond this without additional approval is a deviation.
• Setbacks — the mandatory open space that must be left on all sides of a structure, measured from the plot boundary. Setbacks exist for fire safety, ventilation, and access; encroaching on them (a common deviation) is one of the most frequently cited issues in demolition and regularisation disputes.

The sanctioning authority differs by city. In Bengaluru, plan approvals for most residential plots fall under BBMP (for city-limit properties) or BDA (for BDA-developed layouts). In Pune, it's the PMC or PMRDA depending on jurisdiction. In Hyderabad, it's GHMC or HMDA. Each authority issues its own approved-plan document with a distinct format, but the core information — sanctioned floors, built-up area, setbacks, and parking — is broadly comparable across all of them.

For RERA-registered projects, the sanctioned plan should also match the drawings filed with the state RERA authority at project registration. A mismatch between the RERA-filed layout and the municipal sanction is itself a red flag worth raising with the seller or builder before proceeding.

Step-by-Step: Obtaining and Verifying the Approved Plan

1. Request the sanctioned plan copy from the seller or builder. For an under-construction or newly completed project, this should be readily available — RERA-registered projects are required to make it accessible. For a resale property, ask the current owner; if they don't have it, it can often be obtained from the municipal records office for a fee.
2. Check the sanction number and date. Every approved plan carries a reference number and the date of issue from the sanctioning authority (BBMP/BDA/PMC/GHMC or equivalent). Note these down — they're what you'll cross-check against municipal records.
3. Count the sanctioned floors. Compare the number of floors shown on the plan against what's physically standing. This is the single fastest deviation check a buyer can do without any technical training.
4. Compare built-up area per floor. The plan will show carpet/built-up area for each floor or unit. If the actual construction looks noticeably larger — extended balconies, enclosed terraces, expanded floor plates — flag it.
5. Check setback compliance. Walk the perimeter of the building (where accessible) and see whether the open space around it looks consistent with what the plan specifies. Encroached setbacks are harder to spot without a measuring tape, but obvious cases — a wall built flush to the boundary where a setback should exist — are visible on a simple site visit.
6. Verify parking allocation. Sanctioned plans specify parking layout and count. A shortfall (parking converted into extra saleable area, for instance) is a common and easily observed deviation.
7. Cross-check with the occupancy certificate (OC). An OC is issued only after the completed structure is inspected against the sanctioned plan. If a building has been occupied for years without an OC, that absence is itself informative — it can mean the structure hasn't been certified as matching what was approved.
8. Ask directly about any known deviations. Sellers and builders don't always volunteer this, but a direct, specific question ("Does the built structure match the sanctioned plan exactly, including floor count?") sometimes surfaces information that a passive review won't.

Plan Elements vs Common Deviations vs Buyer Risk

Regularisation Schemes: What Buyers Should Know

Several states have, at various points, introduced regularisation schemes that let owners pay a penalty to bring minor deviations into compliance. These schemes are periodic, discretionary, and not guaranteed to reopen — a buyer should never treat "I'll just regularise it later" as a safe assumption baked into a purchase decision. Regularisation windows can close for years, cover only specific categories of deviation (minor setback encroachment, for example, but not additional unauthorised floors), and vary significantly in scope from one notification to the next. Treat any current or past regularisation scheme as general background information, not a guaranteed remedy for a specific property.

Mini Scenario: A Bengaluru Setback Deviation

Consider a buyer evaluating a G+3 independent house in a Bengaluru suburb. The sanctioned plan, obtained from BBMP records, shows a mandatory 3-foot side setback. On a site visit, the buyer notices the compound wall on one side runs flush with the neighbouring plot boundary — no visible gap. A quick comparison against the plan's setback line confirms the deviation.

This doesn't automatically mean the deal is off. It does mean the buyer now has specific, factual information to act on: ask the seller whether this deviation has been through any regularisation process, get a licensed engineer's written opinion on its severity, and factor the uncertainty into either the price negotiation or the decision to walk away. What it should never mean is proceeding without raising the question at all — which is exactly what happens when buyers don't compare the plan to the built structure in the first place.

The Financing Angle

Lenders routinely commission a technical/legal valuation before disbursing a home loan, and a building with visible deviations from its sanctioned plan can face loan rejection or a reduced loan-to-value ratio. This is a practical reason, independent of any legal risk, why plan-matching matters even to a buyer who isn't personally worried about regulatory enforcement — the bank's risk assessment becomes the buyer's problem the moment financing is involved.

When to Bring In a Licensed Professional

A buyer can do the floor-count and obvious-deviation checks described above without technical training. But some situations genuinely need a licensed architect, structural engineer, or advocate:

• The deviation involves structural elements (an added floor, load-bearing wall changes) rather than cosmetic changes.
• The seller disputes that a deviation exists and the buyer wants an independent measurement.
• The property is in a regularisation grey zone and the buyer needs a professional read on how a specific state scheme applies.
• Legal title or partition questions are intertwined with the plan-compliance question.

DrawMagic does not certify a structure as plan-compliant, and no buyer should treat any online tool, checklist, or platform as a substitute for that licensed opinion when the stakes are this high — a licensed professional's sign-off is what actually protects the buyer in a dispute.

Pro Tips

• Always ask for the sanction number and date in writing, not just a verbal assurance that "it's approved."
• Photograph the building from multiple angles during your site visit specifically to count floors and estimate setbacks — do this before you get emotionally attached to the unit.
• For resale flats within a larger building, check whether the deviation (if any) applies to the whole building or just certain floors/units — this changes who bears the risk.
• If the seller is reluctant to share the sanctioned plan at all, treat that reluctance as information in itself.
• Cross-reference the sanctioned plan's floor count against the RERA project registration filing where the project is RERA-registered.

Common Mistakes to Avoid

• Assuming that because a project has a RERA number, the sanctioned plan and built structure automatically match — RERA registration and plan compliance are related but separate checks.
• Skipping the setback check because it "seems fine visually" — encroachments are often only a foot or two and easy to miss without comparing to the actual plan dimensions.
• Believing a broker's assurance that "everyone regularises it eventually" as a substitute for verifying whether a specific regularisation window currently exists.
• Not asking for the Occupancy Certificate at all, especially for a building that already looks fully occupied.
• Treating plan verification as optional for independent houses — deviation risk is at least as common on individual plots as it is in apartment buildings.

How DrawMagic Fits Into Plan Verification

Buyers doing this kind of due diligence on their own often lose track of which document they've checked, which questions they've asked, and what's still outstanding. DrawMagic's evolving Buyer Intelligence workspace is built to organise exactly this kind of checklist — sanctioned-plan checkpoints, official-record references, and open questions — alongside the other documents a buyer typically has to juggle, so nothing quietly falls through the cracks between a site visit and a purchase decision.

If you're earlier in your search and haven't yet started evaluating specific properties, DrawMagic's buyer-first journey hub is a useful starting point for understanding the full sequence of checks — plan verification being one of several — that a careful buyer works through before signing anything. And because DrawMagic is a software and information platform, not a certifying authority, our responsible AI framing is explicit: we help you organise facts, sources, and as-of dates; we do not certify that any specific structure is plan-compliant. For questions on how any of this works in practice, our help centre is available.

Value Note

Organising your own plan-compliance checklist — sanction number, floor count, setback comparison, OC status — costs nothing and takes a single site visit plus a records request. What it doesn't replace is a licensed architect's or advocate's written opinion once you've identified something specific worth investigating. Use the free checklist approach to know what to ask; use the paid professional opinion to get a defensible answer.

Key Takeaways

• An approved (sanctioned) building plan specifies floor count, built-up area, setbacks, and parking — obtained before construction from the local authority (BBMP/BDA, PMC/PMRDA, GHMC/HMDA, or equivalent elsewhere).
• FSI/FAR determines the maximum built-up area a plot can legally carry; exceeding it is a deviation.
• The fastest deviation check any buyer can do is comparing sanctioned floor count against what's physically built.
• Setback encroachments and enclosed balconies are common, easy-to-miss deviations that show up during a careful site visit.
• An Occupancy Certificate is issued only after the completed structure is checked against the sanctioned plan — its absence on an occupied building is worth investigating.
• Regularisation schemes are periodic and not guaranteed; never treat "we'll regularise it later" as a safe assumption.
• Lenders can reject financing or reduce loan-to-value on properties with visible plan deviations, independent of any legal risk.
• Bring in a licensed architect, structural engineer, or advocate for structural deviations or disputed measurements — DrawMagic organises the checklist but does not certify compliance.
• Ask for the sanction number, date, and RERA-filed drawings in writing rather than relying on verbal assurances.

Frequently Asked Questions

Does every deviation from the sanctioned plan mean a building is illegal or unsafe? Not necessarily. Deviations range from minor (an enclosed balcony) to serious (an unauthorised additional floor). The presence of a deviation is a fact to investigate with a licensed professional, not an automatic disqualifier — but it should never be ignored.

Can I get the sanctioned plan myself if the seller doesn't have it? In most cities, a copy can be requested from the municipal records office for a fee, though the process and turnaround vary by authority. Confirm independently with the specific local authority for your property.

Is a RERA registration the same as plan approval? No. RERA registration confirms the project has been registered with the state real estate regulator and filed certain disclosures, including layout drawings — but the municipal sanctioning authority separately approves the building plan. Both should ideally match; check both.