Unauthorized Construction or Illegal Extra Floor in Your Apartment Building? Action Plan

If a builder or neighbour has put up an illegal extra floor, or your whole building was constructed beyond the sanctioned plan, the construction is not just a paper problem. It can affect your safety, your home loan, your occupancy certificate and the resale value of every flat. This guide explains how to check the sanctioned plan, complain to the right municipal authority, use RTI to get the records, and protect yourself as a resident while the matter is decided.

Reviewed on: 2026-05-29.

This guide is for residents, flat buyers and society members in India who suspect that part of their apartment building is unauthorized. That includes an extra floor added beyond the sanctioned plan, balconies or rooms built over setbacks, terrace flats or penthouses that were never approved, or a building constructed without a valid commencement permission at all. It is also useful for:

• Buyers who were promised one thing in the brochure and now find extra floors or units that do not match the approved plan.
• Society or association members who have noticed new construction on common areas, the terrace or stilt parking.
• Neighbours of a plot where a builder is raising floors that seem to exceed the permitted height or coverage.
• Anyone struggling to get a home loan, occupancy certificate or resale because the building has a deviation on record.

The exact rules — what counts as a deviation, what can be compounded, and what the penalty is — are set by your local building bye-laws and the state Town and Country Planning or municipal law. They differ from city to city. This guide gives you a general action path; always confirm the specifics with your municipal corporation, municipal council, or development authority.

If your concern is more about hidden charges or a builder demanding money for things that were not agreed, see our companion guide on illegal builder demands and hidden charges.

Write down exactly what you think is unauthorized. Be specific: an extra floor above the sanctioned number, a built-up terrace, construction on the setback, or a flat where parking or open space should be. Note the building name, full address, plot or survey number, and the builder or owner's name.

Then start gathering paper. Ask the builder, the society office bearers or your sale agreement file for the sanctioned building plan, the commencement certificate and the occupancy or completion certificate. Buyers are generally entitled to these documents. If anyone refuses, note that refusal in writing — it becomes useful later.

Take dated photographs and short videos of the suspected construction from outside and from common areas. Photos with a visible date help establish when the work existed. Save them in more than one place.

Compare the building you see with the sanctioned plan, if you have it. Count the floors, check the approved height and the number of units, and look at the setbacks marked on the plan. If you do not have the plan, this is the point to prepare an RTI application to the authority that approved the building (see the RTI section below for the exact wording).

Identify the correct authority. For most apartment buildings this is the municipal corporation or municipal council building or town planning department, or a development authority where one controls building permissions in your area. Use your property tax receipt or the builder's sanction letter to find which body approved the plan.

Check for any immediate safety risk. Look for cracks, leaning, water seepage, blocked staircases or fire exits, overloaded electrical wiring, and an over-stressed lift or water tank. An extra floor adds load the structure may not have been designed for. If anything looks dangerous, plan to report it to the fire service and municipal authority on Monday in writing, not just by phone.

Draft your written complaint to the municipal or development authority using the template in this guide. Keep it factual: what you observed, why you believe it deviates from the sanctioned plan, the address and plot details, and a clear request for inspection and action.

Prepare your RTI application in parallel so you can file both early in the week. Index your photographs and any documents you already have. If several residents agree, decide whether to file jointly — a complaint signed by many carries more weight, though one resident's complaint is equally valid.

If your stakes are high — you have already bought a flat, or demolition is being threatened — line up a short consultation with a property lawyer for early next week. Getting the framing right at the start helps in every forum that follows.

You cannot prove a construction is unauthorized until you know what was approved. Get the sanctioned plan, the commencement certificate and the occupancy certificate. Compare the approved number of floors, height, built-up area and setbacks against what stands on the ground. A deviation is the gap between the two. If the builder or society will not share these papers, move straight to an RTI application to the sanctioning authority.

Building permissions in India are granted by local bodies — a municipal corporation, municipal council, nagar panchayat, or a state development or town planning authority, depending on where the property is. Your property tax receipt, the builder's sanction letter, or the RERA project page usually names the body. Sending your complaint to the right authority avoids weeks of it being shuffled around.

Submit a written complaint to the building or town planning department of that authority. Describe the suspected violation, give the address and plot or survey number, attach your photographs, and clearly request a site inspection and action under the building bye-laws. File it at the receiving counter and get a stamped acknowledgement, or use the authority's online grievance or building-violation portal and save the ticket number. Many cities also accept complaints through a citizen app or helpline — but always keep a written, acknowledged copy.

After a complaint, the authority is expected to depute an officer to inspect and record findings. Follow up for the date of inspection. Once it is done, ask for a copy of the inspection report and any notice issued to the builder or owner. If you do not get these, an RTI application is the reliable way to obtain them.

Depending on the bye-laws and the severity of the deviation, the authority may issue a show-cause notice, order the work to stop, allow a minor deviation to be compounded on payment of a penalty, or direct demolition of the unauthorized portion. Major violations — a full extra floor, breach of fire safety, structural or setback norms — are generally not regularisable. The decision is the authority's, guided by the law; it is not something you or the builder can simply settle privately.

If the authority takes no action despite an inspection, keep a clear paper trail. Send reminders quoting your complaint reference number. File RTI applications to learn what the file actually shows — whether a notice was issued, whether it was complied with, and what the officer recommended. Inaction by a public authority is itself a fact you can place before higher officers or a court.

If the local department sits on the matter, escalate within the same body to the Commissioner or head of town planning, and through the public grievance system. Where there is a clear safety risk or the authority simply refuses to act, residents have approached the High Court through a writ petition to direct the authority to do its duty. This is not a do-it-yourself stage — retain a lawyer experienced in property and municipal matters.

If you already own a flat in the building, gather your sale agreement, payment proofs and any builder assurances. Where the builder concealed a violation, you may have remedies before the consumer forum or your state RERA authority for the registered project. Keep paying your dues and follow lawful process; do not take the law into your own hands against the construction.

Replace the text in square brackets with your own details before sending.

To, The Commissioner / Head, Town Planning & Building Department [Name of Municipal Corporation / Municipal Council / Development Authority] [Address of the Office]

Date: [DD/MM/YYYY]

Subject: Complaint regarding suspected unauthorized construction /

       deviation from the sanctioned plan at [Building Name and Address]

Respected Sir / Madam,

1. I am [Your Name], a resident / flat owner / neighbour at

 [Your Address, with flat number if applicable].

2. I wish to report suspected unauthorized construction at

 [Building Name], situated at [Full Address], Plot / Survey No.
 [Number], constructed / extended by [Builder or Owner Name, if known].

3. The suspected violation is as follows:

 [For example: an additional floor above the sanctioned number of
 floors; construction over the setback area; a built-up terrace /
 penthouse that does not appear in the sanctioned plan].

4. I believe this deviates from the sanctioned plan because

 [state your reason — e.g. the visible number of floors exceeds the
 approved number; the structure covers the open / setback area].
 Dated photographs are enclosed.

5. There is / may be a safety concern, namely

 [e.g. visible cracks; blocked staircase or fire exit; overloaded
 electrical lines; over-stressed lift or water system]. [Delete if
 not applicable.]

6. I therefore request you to:

 (a) depute an officer to inspect the said building;
 (b) verify the construction against the sanctioned plan and the
     commencement and occupancy certificates;
 (c) take appropriate action under the applicable building bye-laws
     and municipal law; and
 (d) inform me in writing of the action taken.

7. Kindly treat this as urgent in view of the safety considerations and

 provide me an acknowledgement of this complaint.

Yours faithfully,

[Your Full Name] [Address] [Mobile Number] [Email Address]

Enclosures: A — Dated photographs / videos of the construction B — Copy of sanctioned plan / sale agreement [if available] C — Any earlier complaint or correspondence [if available]

The Right to Information Act, 2005 applies to public authorities. A municipal corporation, municipal council, nagar panchayat, development authority and town planning department are all public authorities. That makes RTI a powerful tool in a building-violation matter, because the records you most need are held by them. RTI can help you in these specific ways:

• Get the sanctioned plan and certificates: If the builder or society will not share them, ask the Public Information Officer for a certified copy of the sanctioned building plan, the commencement certificate and the occupancy or completion certificate for the specific plot or building.
• Find out the approved limits: Ask for the approved number of floors, building height, floor space index or coverage, and setbacks recorded for that plot. This lets you compare approval against what was built.
• Obtain the inspection report: After you complain, ask for a copy of the inspection report and any show-cause notice or order issued to the builder or owner.
• Track your complaint and the file: Ask for the current status of your complaint, the action taken, the name and designation of the dealing officer, and the file notings on the matter.

To file an RTI, see our step-by-step RTI filing guide. The Public Information Officer must respond within the timeline set by the RTI Act. If you get no reply or an unsatisfactory one, use our guide on filing a first appeal under RTI Section 19, and for the full appeal route see the RTI first and second appeal guide. For research-grade strategies on using RTI against public authorities, The RTI Playbook is a useful next read.

RTI has clear limits in this situation:

• RTI cannot demolish or regularise anything: It only gets you information. The power to stop work, compound a deviation or order demolition lies with the municipal authority, and ultimately the courts. RTI supports your complaint; it does not replace it.
• It does not bind a purely private builder's internal papers: A private builder or society is not generally a public authority, so RTI does not compel disclosure of their private accounts or internal documents. Ask the builder directly, or pursue the consumer or RERA route.
• It will not force a faster enforcement decision: RTI gives you the record within its own response window. To actually compel action, you rely on the complaint, internal escalation, the grievance system, and if necessary a writ petition.

• Complaining before you have the sanctioned plan: Without knowing what was approved, you cannot show a deviation clearly. Get the plan first, through the builder, society or RTI.
• Relying on phone calls and verbal assurances: Always put your complaint and reminders in writing and keep acknowledgements. Verbal promises by an officer or builder are almost impossible to enforce.
• Sending the complaint to the wrong body: A complaint to the wrong department gets shuffled for weeks. Confirm whether the corporation, council or a development authority sanctioned the building.
• Ignoring the safety angle: An extra floor adds load the structure may not have been designed for. If you see cracks, blocked fire exits or overloaded services, flag the safety risk to the fire service and authority in writing immediately.
• Assuming every deviation can be regularised: Minor deviations may be compoundable, but a full extra floor or a breach of fire and structural norms often cannot be. Do not let a builder talk you into believing regularisation is automatic.
• Taking the law into your own hands: Do not block, damage or self-demolish the construction. Use the legal process; unlawful action can expose you to liability.
• Not checking your own paperwork as a buyer: If you have bought a flat, keep your sale agreement, brochure and payment proof safe. If the builder concealed the violation, these are your evidence before the consumer forum or RERA.
• Giving up after one round of silence: Authorities sometimes act only after sustained, documented follow-up. Keep escalating with reference numbers and RTI-backed facts.

For related disputes with builders and societies, see our guides on apartment society maintenance overcharging and, for NRI owners facing illegal sale or mutation problems, NRI property disputes in India.

• Ministry of Housing and Urban Affairs (mohua.gov.in) — Urban development policy, model building bye-laws and urban local body information
• RTI Online (rtionline.gov.in) — File RTI applications to central public authorities; many states have their own RTI portals
• CPGRAMS (pgportal.gov.in) — Public grievance portal for central government bodies; states run their own grievance systems

Building permissions are sanctioned by your municipal corporation, municipal council or state development authority. Search for your specific city's municipal or town-planning portal to file building-violation complaints and access local building bye-laws.

Unauthorized construction means building without any sanctioned plan at all, or after the permission has expired. A deviation means a plan was sanctioned but the builder constructed something different from it, such as an extra floor, larger coverage, or fewer setbacks. Both are violations of the local building bye-laws, but the exact treatment, compounding option and penalty differ by municipal authority and state.

Ask the builder or your society for the approved plan first, as buyers are usually entitled to it. If they do not share it, file an RTI application with the Public Information Officer of the municipal corporation, development authority or town planning department that approved the building. Ask for a certified copy of the sanctioned plan, the commencement certificate and the occupancy or completion certificate for that specific plot or building.

Sometimes. Many states allow minor deviations to be compounded by paying a penalty if the deviation is within the limits set in the building bye-laws. Major violations, such as an entire extra floor or construction that breaches fire safety, structural or setback norms, are generally not regularisable and may face demolition. Whether regularisation is possible depends entirely on the local bye-laws and the authority's discretion, so confirm with the municipal authority.

No. RTI is a tool to obtain records such as the sanctioned plan, inspection reports and the status of your complaint. It cannot order demolition or regularisation. The power to act lies with the municipal authority and, if needed, the courts. RTI strengthens your complaint by exposing what the authority did or failed to do, but the enforcement decision is separate.

Risks can include difficulty getting a home loan or resale, denial or delay of the occupancy certificate, demolition of the unauthorized portion, sealing, or higher insurance and safety exposure. Keep your sale agreement, payment proof and any builder assurances. If the builder concealed the violation, you may have a claim before the consumer forum or RERA authority. Consult a property lawyer about your specific facts.

Practice varies by authority. Many municipal bodies accept anonymous or confidential complaints about building violations, and some online portals allow you to file without revealing your identity to the builder. If you fear harassment, ask the authority about confidential filing and keep your own dated copy and acknowledgement of every complaint you submit.

Treat structural and fire safety as urgent. Note visible cracks, water seepage, overloaded electrical lines, blocked fire exits or staircases, and an over-stressed lift or water system. Report any immediate danger to the local fire service and municipal authority in writing. Avoid storing heavy loads on the unauthorized portion and keep escape routes clear until the authority inspects the building.