If you are planning to construct a home or commercial building in Chennai and need CMDA plan approval, this is the most comprehensive guide you will find. It covers every stage — documents, online portals, common pitfalls, timelines, and fees — so your project never gets stuck in approval limbo.
To speak with our CMDA-experienced architectural team directly, call us at +91 7092166366, +91 7092166266, or +91 7092166177. Our architects have processed approvals across Chennai — from Velachery to OMR to Ambattur — and we know this process inside out.
What Is CMDA and When Do You Need Approval?
The Chennai Metropolitan Development Authority (CMDA) is the statutory planning authority for the Chennai Metropolitan Area — a zone that covers Chennai city and 1,089 surrounding revenue villages. If your site falls within this jurisdiction, all construction above a certain threshold requires prior plan approval.
You need CMDA approval if you are:
- Constructing a new residential building (individual house, apartment, villa)
- Adding new floors to an existing building (extension or additional construction)
- Constructing any commercial or industrial building
- Demolishing and rebuilding an existing structure
Important: If your site falls outside the CMA boundary but within Tamil Nadu, it comes under DTCP (Directorate of Town and Country Planning) jurisdiction instead. Always confirm your site's regulatory jurisdiction before applying.
Step-by-Step CMDA Approval Process in Chennai
Skipping this step is the single most common cause of plan rejection. Many homeowners have architects draw up beautiful plans only to discover the proposed height or FSI exceeds what the zone permits.
Required Documents — Complete Checklist
Owner-Furnished Documents
- Current Patta (updated within 3 months) — confirms ownership
- Sale deed / parent document (registered at Sub-Registrar's office)
- Encumbrance Certificate (minimum 15 years)
- Land survey sketch / FMB (Field Measurement Book) sketch
- Latest property tax receipt
- NOC from Tamil Nadu Housing Board (if applicable)
Architect-Prepared Technical Drawings
Your architect must prepare a complete set of structural design and engineering drawings and architectural drawings that comply with CMDA regulations. These include:
- Site plan (1:200 or 1:500 scale) showing plot boundaries, north direction, road width
- Floor plans of all levels (1:100 scale) with room dimensions and areas marked
- Elevation drawings (all four sides) showing building height and facade
- Section drawings (minimum two — longitudinal and cross-section)
- Area statement (plot area, built-up area per floor, total built-up area, FSI calculation)
- Structural stability certificate (signed by a licensed structural engineer)
- Electrical layout drawings and plumbing & drainage drawings (required for multi-floor residential and all commercial projects)
Struggling with CMDA documents? Buildiyo manages the entire approval process for you. Call +91 7092166366 today.
How to Submit via the CMDA Online Portal
CMDA now processes all plan approvals through its Online Single Window (OSW) system. Here is how the online submission works:
- 1 Register on the CMDA OSW portal with your mobile number and Aadhaar
- 2 Create a new project application and enter site details
- 3 Upload all drawings as DWF or PDF files (drawings must be digitally signed by a licensed architect)
- 4 Upload supporting owner documents as scanned PDFs
- 5 Pay the application fees online (see fee chart below)
- 6 Receive application number and track status online
Note: All drawings submitted to CMDA must carry the digital signature of an architect registered with the Council of Architecture (COA). Buildiyo's architects are all COA-registered and use Class 3 DSC (Digital Signature Certificates) for all submissions.
What CMDA Checks During Technical Scrutiny
After submission, the CMDA technical officer reviews your drawings against the following criteria:
- FSI compliance — built-up area must not exceed the permissible FSI
- Setback requirements — front, rear, and side setbacks must meet minimum norms
- Building height restrictions — especially near airports (within AAI height limit zones)
- Parking requirements — minimum car parking must be provided based on built-up area
- Staircase and corridor dimensions (minimum width norms)
- Rainwater harvesting pit provision (mandatory in Chennai)
Get Your CMDA Approval Done Right — The First Time
Buildiyo prepares complete, regulation-compliant CMDA drawing packages. No rejections, no delays, no hidden charges.
Book a Free Consultation →CMDA Plan Approval Fees — 2026 Reference
| Building Type | Application Fee (approx.) | Timeline (normal) |
|---|---|---|
| Residential (up to G+2) | ₹1,000 – ₹8,000 | 30 – 60 days |
| Residential (G+3 and above) | ₹8,000 – ₹25,000 | 45 – 90 days |
| Commercial (small) | ₹5,000 – ₹20,000 | 45 – 75 days |
| Large commercial / mixed use | ₹20,000 – ₹1 lakh+ | 90 – 180 days |
| Note: These are indicative figures. Fees vary based on plot area, built-up area, and specific CMDA zone. Your architect should calculate the exact fee before submission. | ||
The 7 Most Common CMDA Rejection Reasons
Buildiyo's architects prepare CMDA drawings that systematically check all seven rejection criteria before submission — so nothing is missing when your file goes in.
-
1
FSI Exceeded — Built-up area calculation error or insufficient deduction of car parking/staircase areas.
-
2
Setback Non-Compliance — Building footprint too close to plot boundary; front setback particularly strict on NH/SH roads.
-
3
Missing Structural Certificate — Structural stability certificate must be signed by a licensed structural engineer, not just the architect.
-
4
Outdated Land Documents — Patta older than 3 months at time of submission is not accepted.
-
5
Drawing Scale Errors — Plans must be to stated scale. Inconsistencies between plan dimensions and stated area trigger rejection.
-
6
Missing Rainwater Harvesting Provision — Mandatory for all buildings in Chennai; must be shown in drawings.
-
7
Parking Non-Compliance — Insufficient covered or open parking for the proposed built-up area.
FAQ: CMDA Approval in Chennai
Conclusion
The CMDA plan approval process in Chennai is systematic — but only if you work with architects who truly understand its requirements. Every rejection costs you time, money, and stress. Every month of delay is a month your construction sits idle.
Buildiyo has navigated CMDA approvals for residential and commercial projects across Chennai — OMR, Velachery, Tambaram, Anna Nagar, ECR, and beyond. We prepare every document in-house, digitally sign all drawings, and manage the portal submissions so you never have to.
Start Your CMDA Approval Process with Buildiyo
Our approval specialists are ready. No advance payment required. Complete, compliant drawing packages — prepared, signed, and submitted for you.
Book a Free Consultation →