Tamil Nadu CRZ
Tamil Nadu State Coastal Zone Management Authority
Overview
The Tamil Nadu CRZ layer plots the Coastal Regulation Zone footprint along the state's 1,076 km coastline, the second longest in India. It mirrors the approved Coastal Zone Management Plan prepared by NCSCM in 117 maps and notified by the Department of Environment in November 2018, governed by CRZ Notification 2019. The CRZ extends 500 metres landward from the High Tide Line and up to 100 metres along tidal creeks. This page shows what falls inside CRZ-I, II, III A, III B, and IV across all 14 coastal districts, and where construction is restricted.
Regulatory Red Flags Inside the No Development Zone
Tamil Nadu's coastal belt is the most actively litigated CRZ zone in the country right now. The Madras High Court, in February 2026, gave the state until May 31 to dispose of 440 pending appeals on CRZ violations Chennai ECR, tied to 798 notices issued by Greater Chennai Corporation in 2018-19 between Neelankarai and Uthandi.
Most violations sit inside the 500-metre belt from the High Tide Line, with 50+ structures reportedly inside the 200-metre No Development Zone (NDZ). The NGT has separately taken cognisance of beach encroachment near Besant Nagar, and ordered demolition at Radisson Blu Mamallapuram for structures inside the 200-metre belt.
The fact-pack on what each zone permits, drawn from CRZ Notification 2019 and TNSCZMA classification.
CRZ-I A
Permitted Use
Mangroves, sand dunes, turtle nesting, reserve forests
Requires CRZ Clearance?
No new construction; only strategic/utility
Prohibited Without?
Any building
Commonly Misrepresented?
Sold as "sea view plots"
CRZ-I B
Permitted Use
Inter-tidal area (LTL to HTL)
Requires CRZ Clearance?
Pipelines, transmission, salt works only
Prohibited Without?
Houses, resorts
Commonly Misrepresented?
Marketed as "beach plots"
CRZ-II
Permitted Use
Built-up urban municipal areas
Requires CRZ Clearance?
Yes, via TNSCZMA
Prohibited Without?
New construction without CZMP layer reference
Commonly Misrepresented?
Confused with CRZ-III rural
CRZ-III A
Permitted Use
Densely populated rural; NDZ 50 m from HTL
Requires CRZ Clearance?
Beyond NDZ only
Prohibited Without?
Construction inside 50 m
Commonly Misrepresented?
Quoted as "approved layout"
CRZ-III B
Permitted Use
Sparse rural; NDZ 200 m from HTL
Requires CRZ Clearance?
Beyond NDZ only
Prohibited Without?
Anything inside 200 m
Commonly Misrepresented?
Sold without disclosure
CRZ-IV A/B
Permitted Use
Sea up to 12 NM and tidal water bodies
Requires CRZ Clearance?
Fishing, traditional use
Prohibited Without?
Solid waste, mining
Commonly Misrepresented?
Not applicable to plots
Zone Code
Permitted Use
Requires CRZ Clearance?
Prohibited Without?
Commonly Misrepresented?
CRZ-I A
Mangroves, sand dunes, turtle nesting, reserve forests
No new construction; only strategic/utility
Any building
Sold as "sea view plots"
CRZ-I B
Inter-tidal area (LTL to HTL)
Pipelines, transmission, salt works only
Houses, resorts
Marketed as "beach plots"
CRZ-II
Built-up urban municipal areas
Yes, via TNSCZMA
New construction without CZMP layer reference
Confused with CRZ-III rural
CRZ-III A
Densely populated rural; NDZ 50 m from HTL
Beyond NDZ only
Construction inside 50 m
Quoted as "approved layout"
CRZ-III B
Sparse rural; NDZ 200 m from HTL
Beyond NDZ only
Anything inside 200 m
Sold without disclosure
CRZ-IV A/B
Sea up to 12 NM and tidal water bodies
Fishing, traditional use
Solid waste, mining
Not applicable to plots
If a seller cannot show you the survey number marked on the approved CZMP map, that plot does not have a clear CRZ status. Walk away.
Growth Corridors and Micro-Markets Along the Tamil Nadu Coast
Coastal value in Tamil Nadu is uneven. Some stretches are investable with full CRZ clearance Tamil Nadu in place. Others are speculative and trade entirely on the gamble that violation appeals will be regularised through post-facto clearance, a route the Centre opened in 2022 but that is being actively challenged in court.
The corridors land buyers ask about most, mapped against their CRZ exposure.
Kottivakkam, Palavakkam, Neelankarai
Zone (CZMP 2018)
CRZ-II (urban)
Growth Driver
Chennai ECR, 8-9k/sqft apartments
Known Risk
798-notice belt; appeals pending
Uthandi, Kanathur, Akkarai
Zone (CZMP 2018)
CRZ-II to CRZ-III boundary
Growth Driver
DTCP/RERA gated layouts
Known Risk
Mixed CRZ-II/III parcels; verify via TNSCZMA
Mamallapuram (Chengalpattu)
Zone (CZMP 2018)
CRZ-III + CRZ-I A pockets
Growth Driver
UNESCO heritage, ECR widening
Known Risk
Radisson-style demolition orders
Marakkanam, Poonjeri
Zone (CZMP 2018)
CRZ-III B largely
Growth Driver
Resort plots near backwaters
Known Risk
NDZ 200 m enforced strictly
Cuddalore-Nagapattinam belt
Zone (CZMP 2018)
CRZ-III B + CRZ-I A mangroves
Growth Driver
Industrial backbone
Known Risk
Pichavaram mangrove buffer 50 m
Gulf of Mannar (Ramanathapuram)
Zone (CZMP 2018)
CVCA + CRZ-I A
Growth Driver
Pearl coast tourism
Known Risk
CVCA blanket restriction
Kanyakumari coast
Zone (CZMP 2018)
CRZ-III B + CRZ-I A
Growth Driver
Tourism, fisheries
Known Risk
High erosion; PWD CRZ disputes
Corridor / Locality
Zone (CZMP 2018)
Growth Driver
Known Risk
Kottivakkam, Palavakkam, Neelankarai
CRZ-II (urban)
Chennai ECR, 8-9k/sqft apartments
798-notice belt; appeals pending
Uthandi, Kanathur, Akkarai
CRZ-II to CRZ-III boundary
DTCP/RERA gated layouts
Mixed CRZ-II/III parcels; verify via TNSCZMA
Mamallapuram (Chengalpattu)
CRZ-III + CRZ-I A pockets
UNESCO heritage, ECR widening
Radisson-style demolition orders
Marakkanam, Poonjeri
CRZ-III B largely
Resort plots near backwaters
NDZ 200 m enforced strictly
Cuddalore-Nagapattinam belt
CRZ-III B + CRZ-I A mangroves
Industrial backbone
Pichavaram mangrove buffer 50 m
Gulf of Mannar (Ramanathapuram)
CVCA + CRZ-I A
Pearl coast tourism
CVCA blanket restriction
Kanyakumari coast
CRZ-III B + CRZ-I A
Tourism, fisheries
High erosion; PWD CRZ disputes
The most misunderstood corridor is the Uthandi-Akkarai stretch. Buyers assume DTCP or RERA approval clears the CRZ question. It does not. TNSCZMA clearance is a parallel approval, and a layout sanctioned in the 1980s before the 1991 notification does not exempt fresh construction inside today's NDZ.
Frequently Asked Questions
What is CRZ in Tamil Nadu and how does it apply to my plot?
Tamil Nadu CRZ** covers the land area within 500 metres of the High Tide Line and 100 metres along tidal creeks, governed by CRZ Notification 2019 under the Environment (Protection) Act 1986. It applies to any plot in 14 coastal districts.
How do I check if my plot is in CRZ?
Match your survey number against the approved CZMP map uploaded by the Tamil Nadu Department of Environment in 117 sheets. The plot's classification will read CRZ-I, II, III A, III B, or IV. Anything within 500 m from HTL is in CRZ.
Can I build a house within 500 metres of the sea in Tamil Nadu?
Yes, but only beyond the NDZ. In CRZ-III A and CRZ-III B, that means 50 m or 200 m from HTL respectively. In CRZ-II urban areas, construction is allowed on the landward side of existing approved roads, with TNSCZMA clearance.
Who gives CRZ clearance in Tamil Nadu?
The Tamil Nadu State Coastal Zone Management Authority (TNSCZMA) clears CRZ-II and CRZ-III projects. CRZ-I and CRZ-IV proposals go to MoEFCC at the Centre, on TNSCZMA recommendation. District authorities recommend at the first level.
What is the No Development Zone in CRZ-III?
NDZ in CRZ-III A is 50 metres from HTL, applied where rural population density exceeds 2,161 per sq km as per Census 2011. In CRZ-III B, NDZ is 200 metres. Inside NDZ, only repairs and traditional dwellings are allowed.
Are ECR plots affected by CRZ?
Yes. Most ECR villages from Kottivakkam to Mamallapuram fall in CRZ-II or CRZ-III. The Madras HC has 440 pending appeals against ECR construction inside the 500-metre belt, set for disposal by 31 May 2026.
What is the difference between CRZ-III A and CRZ-III B?
CRZ-III A and CRZ-III B split rural CRZ areas by 2011 Census density. CRZ-III A is densely populated rural with 50 m NDZ. CRZ-III B is sparsely populated rural with 200 m NDZ. The classification is fixed in the approved CZMP map Tamil Nadu**.
Can old houses on the beach be repaired in CRZ?
Yes. Repair or reconstruction of existing authorised structures is allowed without expanding plinth area, FSI, or density. Traditional fishing community dwellings get specific protections. Anything beyond repair needs fresh TNSCZMA clearance.
Disclaimer
Data Source & Verification
Source
Official Tamil Nadu State Coastal Zone Management Authority documents
Official Website
tnsczma.tn.gov.in
Coordinate Reference System
EPSG:4326 (WGS 84)
Geometry Type
Polygon / MultiPolygon
Data Format
Vector (GeoJSON) + Raster Tiles
Last Verified
2026
Status
Active