Document Guide · Tamil Nadu
How to Check Building Plan Approval in Tamil Nadu — Complete Guide 2026
Building Plan Approval Tamil Nadu is the sanctioned plan issued by the local body or CMDA under TNCDBR 2019, certifying that proposed construction meets zoning, FSI, and safety norms. Buyers must verify the approved plan matches the on-ground structure exactly. This guide covers the application route, fees, common defects, and red flags.
Quick Reference
Also calledSanctioned Building Plan, Planning Permission, Building Permit, BPA
Issued byLocal body (Corporation, Municipality, Town Panchayat, Village Panchayat) or CMDA for Special Buildings inside Chennai Metropolitan Area
Valid for3 years from date of issue, renewable
Cost₹100/sqft in Greater Chennai Corporation; ₹88/sqft in Coimbatore, Tiruppur, Madurai; ₹84/sqft in Tambaram, Salem, Tiruchy; ₹79/sqft in Avadi, Tirunelveli, Vellore, Thoothukudi, Erode; ₹22 to ₹70/sqft in town and village panchayats
Time taken30 to 60 working days for ordinary buildings; 60 to 120 days for Special Buildings
Online portalonlineppa.tn.gov.in (TNOBPAS)
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What is Building Plan Approval in Tamil Nadu?
Definition
Building Plan Approval Tamil Nadu, also called Planning Permission or Sanctioned Building Plan, is the formal permit granted under Section 49 of the Tamil Nadu Town and Country Planning Act, 1971 and the Tamil Nadu Combined Development and Building Rules (TNCDBR), 2019. It certifies that proposed construction or alteration complies with Master Plan zoning, FSI limits, road set-back, parking, fire safety, and structural norms before any work begins.
The approval is a two-tier process. CMDA grants Planning Permission inside the Chennai Metropolitan Area for Special Buildings (G+4 and above, or height above 15m) and Multi-Storeyed Buildings. The Greater Chennai Corporation, Municipalities, Town Panchayats, or Village Panchayats grant Building Permits for ordinary buildings up to G+3 under CMDA's framework. Outside the CMA, DTCP and the Local Planning Authority operate the same workflow with the local body issuing the building permit.
Buyers of completed buildings must verify the sanctioned plan against the on-ground structure. Sellers commonly add unauthorised floors, encroach on set-backs, or exceed approved FSI. Each deviation is a violation under the T\&CP Act 1971 and exposes the buyer to demolition orders, refusal of utility connections, and rejection of bank loans. The Tamil Nadu Single Window Portal at onlineppa.tn.gov.in (also TNOBPAS) is the only portal where the sanctioned plan can be cross-checked against the application records.
State-specific note: The on-ground structure must match the sanctioned plan exactly. Extra floors, deeper basements, encroached set-backs, or excess FSI are unauthorised under the T\&CP Act 1971 and trigger demolition or paid regularisation under Section 113-C.
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How to Get Building Plan Approval in Tamil Nadu: Step-by-Step on onlineppa.tn.gov.in
Two routes process a Building Plan Approval Tamil Nadu application. The Tamil Nadu Single Window Portal at onlineppa.tn.gov.in handles online filing for CMDA, GCC, and local bodies across Tamil Nadu. Have the Patta, Sale Deed, EC, layout approval (DTCP/CMDA), site plan, and building plan signed by a licensed architect ready before starting.
Online method (recommended)
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Identify the approving authority Inside the Chennai Metropolitan Area: ordinary buildings up to G+3 go to Greater Chennai Corporation or the local body; Special Buildings (G+4 and above, or height above 15m) go to CMDA
Outside the CMA: DTCP via the Local Planning Authority, with the local body issuing the building permit.
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File on TNOBPAS Log in to onlineppa
tn.gov.in. Create a new application under Building Plan Application. Locate the plot on the GIS map interface. The system auto-checks zoning, master plan land use, and CRZ overlay. Upload Patta, EC, sale deed, site plan, building plan, structural drawings, and the architect's signed declaration.
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Pay scrutiny and demand charges Pay the application scrutiny fee online
After technical scrutiny, the local body or CMDA raises a demand for development charges and the per sqft application fee. Greater Chennai Corporation collects ₹100/sqft; lower in other corporations and panchayats.
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Site inspection and sanctioned plan A Building Plan Inspector or Town Planning Officer inspects the site
On compliance, the digitally signed sanctioned plan and the building permit issue together. Construction must complete within 3 years; the permit is renewable on application. * ###
* For plots up to 2,500 sqft with built-up area up to 3,500 sqft, ground or G+1 only, height up to 7m, residential use, the self-certification small buildings route on TNOBPAS skips full scrutiny. Completion certificate is also exempted for these.
Offline method (Sub-Registrar Office)
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Visit the right counter Local bodies (GCC, Municipal Corporation, Municipality, Town Panchayat, or Village Panchayat) accept Form B and Form C applications for ordinary buildings
CMDA accepts Form B directly for Special Buildings at Thalamuthu-Natarajan Maligai, No. 1, Gandhi-Irwin Road, Egmore, Chennai-600 008.
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Submit forms and plans Form B duly signed by the owner and the licensed architect, Form C undertaking from the owner, plus Patta, EC, sale deed, site plan, building plan with structural drawings, and Aadhaar
Pay the admission fee and scrutiny charges at the counter.
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Technical scrutiny and site inspection The plan is scrutinised against the Master Plan, Detailed Development Plan, and TNCDBR 2019 norms
A Building Plan Inspector or Town Planning Officer inspects the site. Deficiencies are issued for revision; expect one or two rounds for complex applications.
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Demand notice and sanction On compliance, a demand for development charges issues
After payment, the sanctioned plan and the building permit are released with the digital approval reference. Construction must follow the approved plan; deviations are unauthorised. *
* Demand a copy of the sanctioned plan with the approval reference. Do not start construction or pay an advance to a builder before this digital sanction is in hand.
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What Does the Sanctioned Building Plan Contain in Tamil Nadu?
Each sanctioned plan is the legal blueprint of the approved structure. Mismatch on any field against the on-ground build is a violation under the T\&CP Act 1971.
| Field | What it means | What to check |
|---|---|---|
| Approval Number and Date | Unique sanction reference | Verify on onlineppa.tn.gov.in or with the issuing authority |
| Approving Authority | CMDA, GCC, DTCP, or local body | Must match the parcel's jurisdiction and building category |
| Plot Details | Survey number, sub-division, extent | Match against Patta, FMB, and sale deed |
| Approved FSI | Floor Space Index sanctioned for the build | On-ground built-up area must not exceed |
| Set-back Distances | Front, rear, side set-backs | Confirm physical compliance on site |
| Number of Floors and Height | Approved storeys and total height | Extra floors are unauthorised under TNCDBR 2019 |
| Use Category | Residential, commercial, mixed-use, institutional | Cannot be changed without fresh sanction |
| Validity Period | 3 years from date of issue | Construction must complete within this window |
Good sign: A clean sanctioned plan shows a verifiable approval number on the Single Window Portal, FSI and set-backs matching the on-ground build, the correct issuing authority for the zone, and a digital signature from the local body or CMDA.
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Common Issues With Building Plan Approval in Tamil Nadu
Each sanctioned plan is the legal blueprint of the approved structure. Mismatch on any field against the on-ground build is a violation under the T\&CP Act 1971.
On-ground structure does not match sanctioned plan
The Buyer Warning is direct: verify plan matches structure. Sellers add an unauthorised floor, deeper basement, or larger built-up area than the sanctioned plan allows. Each deviation is unauthorised construction under the T\&CP Act 1971 and triggers demolition orders, refused utility connections, and bank loan rejection. *
Fix: * Match the on-ground built-up area, set-backs, height, and number of floors against the sanctioned plan field by field. Walk away from any unit beyond the approved FSI.
No sanctioned plan produced by the seller
Some sellers offer apartments or houses without producing the digitally signed sanctioned plan, claiming "approval is in process" or "completion certificate later". Without a sanctioned plan, the construction is unauthorised. Banks refuse loans, the Sub-Registrar may flag the deed, and resale stalls. *
Fix: * Demand the sanctioned plan and the approval number. Verify on onlineppa.tn.gov.in. No verified approval number, no advance, no registration.
Approval expired without renewal
Building Plan Approvals are valid for 3 years from the date of issue. Builders occasionally start construction before approval, finish after expiry, or never apply for renewal. The sanction loses force on expiry; ongoing or post-expiry construction is unauthorised. *
Fix: * Confirm the approval is current or has been renewed. Check the issue date and validity period on the sanctioned plan and verify renewal entries on the portal.
Approval issued by wrong authority
Inside the CMA, Special Buildings (G+4 and above, or height above 15m) need direct CMDA approval. A local body cannot sanction these. Sellers occasionally show a local body permit for a Special Building. The permit is non-applicable and the construction is unauthorised. *
Fix: * Match building category against the approving authority. Special Buildings inside CMA require CMDA. Outside CMA, DTCP via LPA. Wrong-authority permits are non-actionable.
FSI exceeded or set-backs encroached
TNCDBR 2019 fixes FSI by zone and use; set-back distances by plot size. Builders carve open balconies into rooms, build into front set-backs, or push the rear into common land. Each is a violation that surfaces during loan inspection or completion certificate filing. *
Fix: * Pace front, rear, and side set-backs on site against the sanctioned plan. Refuse possession of any unit with FSI or set-back violations until rectified or regularised.
Unauthorised construction offered with "regularisation pending"
The 2017 Regularisation of Unauthorised Buildings Rules under Section 113-C of the T\&CP Act 1971 offer a paid scheme for some violations. Sellers market unauthorised buildings as "regularisation pending". Many applications stall or are rejected; the buyer carries the risk. *
Fix: * Demand the regularisation reference number and check status on the portal. Buy only after the regularisation order is issued, not on the promise of one.
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Why Building Plan Approval Matters for Land Buyers in Tamil Nadu
The sanctioned plan is the single document that decides whether a building is legal, financeable, and resaleable in Tamil Nadu.
Legalises the structure under the T\&CP Act 1971 Building Plan Approval is the statutory permit for any new construction, extension, or alteration in Tamil Nadu
Without it, the structure is unauthorised. The local body issues stop-work orders, refuses water and electricity, and may proceed to demolition.
Mandatory match between sanctioned plan and on-ground build The Buyer Warning is explicit: verify plan matches structure
Tamil Nadu's TNCDBR 2019 treats every deviation, extra floor, breached set-back, exceeded FSI, as a separate violation. Buyers who skip the field-by-field match inherit the violation and the regularisation cost.
Required for bank home loans and insurance Banks and housing finance companies pull the sanctioned plan and the approval number before sanctioning home loans
Property insurance underwriters also require it. Unauthorised or unmatched buildings get rejected at the credit and underwriting stages.
Tamil Nadu-specific: Two-tier authority structure Tamil Nadu uses Planning Permission (CMDA, DTCP, LPA) plus Building Permit (GCC, Municipality, Town Panchayat, Village Panchayat) under the same TNCDBR 2019 framework
Special Buildings inside the CMA need direct CMDA sanction. Buyers must confirm jurisdiction before checking any approval number.
Red flag: If a seller in Tamil Nadu cannot produce the digitally signed sanctioned plan, claims "completion certificate later", or shows a local body permit for a Special Building inside CMDA limits, walk away.
Browse verified land in Tamil Nadu
Browse Verified Tamil Nadu LandsFrequently Asked Questions
What is Building Plan Approval Tamil Nadu?
Building Plan Approval Tamil Nadu is the sanctioned plan and permit issued under Section 49 of the T\&CP Act 1971 and TNCDBR 2019. It is granted by CMDA, the Greater Chennai Corporation, Municipality, Town Panchayat, or Village Panchayat depending on the parcel's jurisdiction and building category.
How do I apply for building plan approval online in Tamil Nadu?
Log in to onlineppa.tn.gov.in (TNOBPAS), create a building plan application, locate the plot on the GIS map, upload Patta, EC, sale deed, site plan, building plan, and architect declaration, pay scrutiny fees, and the system routes the file to the correct authority.
What are the fees for building plan approval in Chennai and Tamil Nadu?
Greater Chennai Corporation charges ₹100/sqft. Coimbatore, Tiruppur, and Madurai charge ₹88/sqft. Tambaram, Salem, Tiruchy charge ₹84/sqft. Avadi, Tirunelveli, Vellore, Thoothukudi, Erode charge ₹79/sqft. Town panchayats range from ₹45 to ₹70/sqft; village panchayats charge ₹22 to ₹27/sqft.
How long does building plan approval take in Tamil Nadu?
Ordinary residential buildings typically take 30 to 60 working days. Special Buildings requiring direct CMDA approval take 60 to 120 working days. Incomplete documents and FSI non-compliance are the two most common causes of delays beyond these standard timelines.
Is self-certification available for small residential buildings in Tamil Nadu?
Yes. Plots up to 2,500 sqft with built-up area up to 3,500 sqft, residential use, ground or G+1 only, height up to 7 metres, qualify for self-certification on TNOBPAS. Completion certificates are also exempted for these self-certified small buildings.
What is the validity period of Building Plan Approval Tamil Nadu?
The Planning Permission is valid for 3 years from the date of issue under the CMDA framework. Construction must complete within that window. Extensions are possible through a renewal application before expiry. Construction beyond expiry is unauthorised under the T\&CP Act 1971.
What happens if the on-ground structure does not match the sanctioned plan?
The deviation is unauthorised construction under the T\&CP Act 1971 and TNCDBR 2019. The local body issues stop-work or demolition notices. Bank loans are rejected. Resale value drops. Regularisation under Section 113-C is paid and uncertain.
What is the difference between Planning Permission and Building Permit?
Planning Permission is the zoning and FSI clearance issued by CMDA, DTCP, or LPA confirming the proposed development fits the Master Plan. The Building Permit is issued by the local body (GCC, Municipality, Town Panchayat) authorising actual construction. Both must be in hand before work starts.