Unauthorized construction verification is the process of checking whether a building or part of it violates approved plans, zoning rules, or building bye-laws. According to the Karnataka Municipal Corporations Act 1976 and the RERA Act 2016, buyers can face demolition, fines, and title issues if they purchase such property. In my 20 years of practice, I have seen dozens of clients lose money because they skipped this check.
What is unauthorized construction and why does it matter before you buy?
Unauthorized construction means any structure built without proper approval from the local authority, or built in a way that deviates from the approved building plan. In Bangalore, the Bruhat Bengaluru Mahanagara Palike (BBMP) is the authority that approves building plans and issues completion certificates. If a building has extra floors, extended balconies, or uses a residential plot for commercial purposes without permission, that is unauthorized.
Why should you care? Because you are buying the problem along with the property. The BBMP can issue a notice to demolish the unauthorized portion, impose fines, or even seal the entire building. The buyer is not protected just because the seller hid it. In fact, the buyer inherits the liability.
I remember a client who bought a flat in a so-called 'luxury' project in Whitefield. The builder had added an extra floor without approval. Two years later, the BBMP ordered demolition of that floor. My client was stuck with a property that lost value overnight.
How do you verify unauthorized construction in Bangalore?
Verification is not a single step. It is a combination of document checks, site visits, and official record searches. Here is the process I follow for every client.
Step 1: Check the building plan approval and completion certificate
Ask the seller or builder for the sanctioned building plan, the commencement certificate, and the completion certificate. The sanctioned plan shows what was legally approved. The completion certificate, issued by the BBMP, confirms that the building was built as per that plan. If the completion certificate is missing or the plan does not match the actual structure, that is a red flag.
Step 2: Compare the approved plan with the actual structure
Do not just look at the paper. Visit the site and compare. Check the number of floors, the setback distances, and the total built-up area. Even a small deviation can be a problem. For example, if the approved plan says ground plus three floors, but the building has four, that extra floor is unauthorized.
Step 3: Search for violation notices or orders
The BBMP issues notices when it detects violations. You can file an application under the Right to Information Act to get copies of any notices against the property. Also check if there are any court cases pending related to the building. These records are public, but you have to ask.
Step 4: Check the occupancy certificate
For apartments, the occupancy certificate (OC) is crucial. It is issued only after the building is found to comply with all rules. Without an OC, the building is considered unauthorized for occupation. Many builders in Bangalore hand over flats without an OC, and buyers do not realize the risk until later.
Step 5: Use online portals for preliminary checks
BBMP has an online building plan approval system (BPS) and a property tax portal. You can search for the property's khata number and see if the tax records match the actual construction. A mismatch between the khata details and the physical structure is a warning sign.
What documents do you need for unauthorized construction verification?
To do a thorough check, you need the following documents. Keep them ready before you start.
- Sanctioned building plan from BBMP
- Commencement certificate
- Completion certificate or occupancy certificate
- Khata certificate and latest property tax receipts
- Sale deed and mother deed of the property
- Encumbrance certificate (EC) for the last 13 years
- Approved layout plan or subdivision plan
- Any prior sale agreements or documents showing the history
Do not assume the seller will hand over all these voluntarily. You have to ask, and if they are reluctant, that itself is a red flag.
How long does unauthorized construction verification take?
In my experience, a full verification can take anywhere from 3 days to 2 weeks, depending on the complexity and the cooperation of the seller. The document review is quick, but getting official records from BBMP or the sub-registrar can take time. If you are in a hurry because of a token advance deadline, you can do a preliminary check in 48 hours, but that is not enough. A thorough check is always worth the wait.
What happens if you skip unauthorized construction verification?
I have seen the consequences many times. Here are some of the most common outcomes when buyers skip this check.
Demolition orders
If the unauthorized portion is significant, the BBMP can order demolition. You lose the entire structure or the part that violates the rules. In one case, my client bought a house in a layout that had been built on a storm water drain. The BBMP demolished it within a year, and the bank still wanted its loan back.
Fines and penalties
Even if demolition is not ordered, the BBMP can impose hefty fines. The penalty is calculated based on the extent of violation and the property value. In 2025, the BBMP revised its compounding fees, which can run into lakhs for even minor deviations.
Difficulty in getting a loan or selling later
Banks and financial institutions do a due diligence check before approving a home loan. If they find unauthorized construction, they will reject the loan application. Even if you manage to buy, the next buyer will face the same problem, making it hard to sell.
Legal disputes
You may end up in court, fighting a demolition order or a dispute with the seller. Court cases in Karnataka can take years. According to the National Judicial Data Grid, civil cases in Karnataka courts take an average of 3 to 5 years to resolve. That is a long time to live with uncertainty.
How much does unauthorized construction verification cost in Bangalore in 2026?
The cost depends on whether you do it yourself or hire a professional. Here is a rough breakdown.
- Self-verification: You only pay for the EC (around 200 rupees per copy) and RTI fees (minimal). But your time and the risk of missing something are high.
- Lawyer-led due diligence: At Legal Brigade, we charge a flat fee that is a fraction of what large firms quote. For a standard apartment purchase, it is usually between 10,000 and 25,000 rupees, depending on the complexity. This includes title verification, EC search, khata check, and an unauthorized construction assessment.
Compare that to the cost of losing your investment. A single mistake can cost you lakhs. In my view, the fee is a small price for safety.
Self-verification vs lawyer-led due diligence: which is better?
You might think you can do the verification yourself. Let me be honest: you can, but you will likely miss something. Here is a comparison.
| Aspect | Self-Verification | Lawyer-Led Due Diligence |
|---|---|---|
| Cost | Low (around 500 rupees) | Flat fee, usually 10k-25k |
| Time | 1-2 weeks of your time | 48-72 hours, urgent same day |
| Risk of missing issues | High | Low, due to experience |
| Knowledge of legal nuances | Limited | 20+ years of practice |
| Ability to catch hidden problems | Low | High, e.g., unreleased mortgages |
Takeaway: If you are spending your life savings on a property, do not gamble on self-verification.
What is a khata and how does it relate to unauthorized construction?
Khata is the property tax account maintained by the BBMP. It shows who is responsible for paying property tax on the building. There are two types: A khata and B khata. A khata is issued for properties that comply with all regulations. B khata is for properties that have some violation, like being on a revenue site or having unauthorized construction. Many buyers do not understand the difference.
If the property has a B khata, it is a clear indication that something is wrong. Banks usually do not lend on B khata properties. And the BBMP can refuse to convert it to A khata unless the violation is rectified.
A khata vs B khata
| Feature | A Khata | B Khata |
|---|---|---|
| Eligibility for bank loan | Yes | No |
| Legal status | Compliant | Non-compliant |
| Scope for future sale | Easy | Difficult |
| Property tax rate | Standard | Higher, if accepted |
Takeaway: Always insist on an A khata before you buy. If the seller offers a B khata at a discount, remember why.
How does RERA help you check unauthorized construction?
The Real Estate (Regulation and Development) Act, 2016, requires builders to register their projects with the state RERA authority. For projects that are registered, the builder must upload the approved plans and updates on the RERA website. You can check if the project is registered and if the plans match what is being built. RERA also provides a complaint mechanism. According to the Karnataka RERA, there are over 3,000 registered projects in the state as of 2025. But not all projects are registered, and even some that are have violations. So RERA is a useful tool, but not a guarantee.
What are the common red flags during verification?
Over the years, I have learned to spot problems quickly. Here is a list of red flags that should stop you from proceeding.
- Missing completion certificate or occupancy certificate
- Building plan does not match the actual structure
- Khata is B type or not in the seller's name
- EC shows a mortgage that is not released
- Seller is reluctant to provide documents
- Property is on a revenue site (not a BBMP-approved layout)
- Building is on a storm water drain or lake bed
- There is a court injunction against the property
If you see any of these, do not pay a rupee more until you get clarity.
How can you get help with unauthorized construction verification in Bangalore?
If you are not confident about doing this yourself, you can hire a professional. At Legal Brigade, we have been doing this for over 20 years. We usually return a title opinion in two to three days because we have a process that works. Our fees are transparent and flat, and we have saved many clients from bad deals. You can check property document verification in Bangalore to see how we work. We can also help if you have already signed an agreement and want a quick check.
In the end, unauthorized construction verification is not a luxury. It is a necessity. Do not let a seller's urgency push you into skipping it. Take your time, do the checks, and if you are unsure, ask a professional. You will thank yourself later.
What are the legal consequences for buyers of unauthorized construction?
Beyond demolition and fines, there are long-term legal consequences. The BBMP can refuse to issue a khata, which makes it impossible to get a loan or sell the property. You may also face criminal proceedings under the Karnataka Municipal Corporations Act for continuing the violation. In extreme cases, the property can be confiscated. I have seen buyers who thought they got a bargain, only to lose everything in court.
What is the role of the encumbrance certificate in unauthorized construction verification?
An encumbrance certificate (EC) is a record of all financial transactions related to the property. It shows if there is any outstanding loan or mortgage. While an EC does not directly show unauthorized construction, it can reveal if the property was used as collateral for a loan that was not repaid. If the EC shows a mortgage that is still active, the bank has a claim on the property. This is a separate but equally important check. In 20 years, I have seen clients almost lose their homes because of an unreleased mortgage.
How to check if a property is on a revenue site or a B khata?
Revenue sites are plots that have not been approved by the BBMP. They are typically in areas that were originally agricultural land. You can check the khata type and also the layout approval status. The BBMP has a list of approved layouts. If your property is not in that list, it is likely on a revenue site. Also, the property tax receipt will show the khata type. In 2026, the BBMP has been strict about B khata properties, and there is talk of phasing them out. So buying a B khata property is a big risk.
What is the difference between a sale deed, mother deed, and title deed?
These terms confuse many buyers. The mother deed is the oldest document that establishes the ownership of the land. The sale deed is the document that transfers ownership from the seller to you. The title deed is a general term for any document that proves ownership. In verification, you need to trace the chain of ownership through the mother deed and subsequent sale deeds to ensure there are no breaks or disputes. This is part of title verification, which is often done along with unauthorized construction checks.
How long does it take to get a completion certificate or occupancy certificate from BBMP?
Getting a completion certificate from BBMP can take months, even years, especially if there are deviations. In 2025, the BBMP introduced an online system to speed up the process, but it is still not quick. If the builder has not obtained the OC, that is a warning sign. Do not accept excuses like 'it is in process'. In many cases, it is in process because the building does not meet the rules.
What are the penalties for unauthorized construction under Karnataka law?
Under the Karnataka Municipal Corporations Act, the BBMP can impose a fine that is a percentage of the property value. In 2025, the compounding fee for deviations was revised. For example, for a building with an extra floor, the fee can be 10% to 50% of the guidance value of that portion. The BBMP can also order the demolition of the unauthorized part. In serious cases, the builder or buyer can face imprisonment. The law is clear: unauthorized construction is a punishable offense.
How to use the BBMP website to check unauthorized construction?
The BBMP has a 'Building Plan Approval' portal where you can search for the status of a building plan. You need the application number or the property's khata number. The portal shows if the plan was approved, if there are any deviations, and if a completion certificate was issued. This is a quick way to get a preliminary idea. However, the information on the portal may not be up to date. So use it as a starting point, not as the final word.
What should you do if you discover unauthorized construction after buying?
If you already bought and found out later, do not panic. The first step is to get a legal opinion. In some cases, you can approach the BBMP to regularize the construction if it is a minor deviation. The Karnataka government has had regularization schemes in the past. But for major violations, you may have to approach the court. In my experience, early action is better than waiting. The longer you wait, the more penalties you may face.
How can Legal Brigade help with unauthorized construction verification?
At Legal Brigade, we have a dedicated team for property due diligence. We do a thorough check that includes unauthorized construction, title, encumbrance, khata, and more. We have seen it all, and we know where to look. We usually return a report in two to three days, and we keep our fees affordable. If you are buying property in Bangalore, do not take risks. Book a free property consultation with us, and we will guide you. You can also read more property buying guides on our blog. In 20 years, I have never seen a client regret doing due diligence. But I have seen many regret skipping it.
Frequently Asked Questions
What is unauthorized construction verification?
It is the process of checking whether the building on a property was constructed in compliance with the approved plan, zoning regulations, and bylaws of the local authority. In Bangalore, this means verifying with the BBMP or the relevant panchayat that the structure has not deviated from the sanctioned plan. I have seen many buyers discover too late that a third floor was added without approval, leading to penalties or even demolition orders.
Why does unauthorized construction matter when buying property?
If you buy a property with unauthorized construction, you inherit the legal risk. The municipal authority can issue a notice to demolish the illegal portion, impose hefty fines, or refuse to provide a khata or occupancy certificate. In my 20 years of practice, I have handled cases where buyers were stuck with a property they could not sell or mortgage because the illegal construction was flagged during resale. It can also affect your eligibility for a home loan, as banks often refuse to finance such properties.
How can I check if a property has unauthorized construction?
First, obtain a copy of the sanctioned plan from the local authority and compare it with the actual structure on site. Then, check the khata and occupancy certificate, if available, to see if they reflect the current status. You should also visit the BBMP office or their website to see if there are any violation notices or complaints against the property. However, these steps can miss subtle deviations, which is why a professional verification is advisable.
What is the cost of unauthorized construction verification in Bangalore?
For a thorough verification that includes checking the sanctioned plan, khata, EC, and site inspection, a professional lawyer or a due-diligence firm typically charges between Rs 5,000 and Rs 15,000 in Bangalore, depending on the property value and complexity. At Legal Brigade, we offer a flat fee of Rs 9,999 for a complete title and construction verification report. This is a small price compared to the potential loss if you buy a property with illegal construction.
How long does the verification process take?
A standard verification, including checking documents with the sub-registrar and local authority, usually takes 2 to 3 working days. In my experience, if the documents are in order and the authorities are responsive, we can often deliver a report within 48 to 72 hours. For complex cases involving multiple properties or litigation, it might take a week. I always advise buyers to factor in this time before signing an agreement or paying an advance.
Can I do unauthorized construction verification myself?
You can attempt it, but there are many pitfalls. A layperson might not know where to look for violations, how to interpret the sanctioned plan, or how to detect if the EC has been fabricated. I have seen buyers rely on a broker's assurance and later discover that the property had a court injunction or a violation notice that the broker never mentioned. A lawyer brings legal expertise and experience in reading these documents critically, which can save you from a costly mistake.
What happens if I buy a property with unauthorized construction by mistake?
If you discover it after purchase, you may have to regularize the construction by paying a penalty, if the deviation is minor and within the permissible limit. In serious cases, you might have to demolish the illegal part at your own cost. You could also face legal action from the municipal authority. I have seen buyers fight for years to get a khata or occupancy certificate. In some cases, the buyer can go back to the seller for breach of contract, but that is a lengthy and uncertain process.
If you are about to buy a property and want to be sure it is not carrying unauthorized construction, do not leave it to chance. I have seen too many buyers lose their hard-earned money because they skipped this step. At Legal Brigade, we can run a full verification of the property's title and construction status, and we usually deliver the report in two to three days at a transparent flat fee. Send us your documents and we will tell you exactly where you stand, so you can book a free property consultation and make an informed decision.
Written by Advocate Raghavendra S C, a Bangalore-based property lawyer with 20+ years of practice in property title verification, due diligence, registration, and civil litigation across Karnataka courts and sub-registrar offices. For a property title check or due-diligence opinion in Bangalore, contact Legal Brigade at legalbrigade.co.in.