In 2026, CMDA has been shifting away from direct construction activity to focus squarely on its core mandate: planning, approvals, and enforcement. For property buyers, this points toward tighter scrutiny of unauthorized and deviated construction across Chennai, not less. If you're buying a flat or independent house, here is what a mismatch between the approved plan and the actual structure means for your loan, your resale value, and your valuation report.
A deviation is any meaningful difference between what the CMDA or local body approved on paper and what actually exists on the ground. In Chennai, the most common examples are:
CMDA's move to step back from direct construction work and concentrate on planning, approvals, and enforcement means more of its administrative capacity is going toward exactly this: checking whether existing structures match what was sanctioned. For buyers, this changes the risk calculation. A deviation that quietly existed for years without attracting attention is more likely to surface now, whether through a routine inspection, a neighbour's complaint, or a bank's due diligence.
Key fact for buyers: CMDA's enforcement toolkit includes Locking, Sealing, and Demolition (LSD) notices for buildings found to be unauthorized or seriously non-compliant. A property under an active or even a past LSD notice carries a legal cloud that a purchase agreement alone will not resolve.
Deviations come to light in several ways, and none of them are things a buyer can fully control after the purchase:
The consequences scale with the severity of the deviation. At the milder end, a bank may simply lend against the approved area only, treating the excess construction as having no collateral value. At the more serious end, a building can be issued a Stop Work Notice, sealed, or ordered for demolition under the Tamil Nadu Town and Country Planning Act. In between, an owner may face refusal of a Completion Certificate, inability to get a fresh electricity connection in their name, or difficulty securing any bank loan at all.
A registered valuer's job in a bank valuation is not just to state a market price but to state it against a verified legal position. If a flat has ten percent more built-up area than the sanctioned plan, a properly prepared report values the approved area at market rate and either excludes the excess or flags it explicitly as unauthorized. Banks then structure the loan around the approved, lower figure, not the larger structure the buyer may believe they are purchasing.
The same logic applies when computing capital gains on a later sale. A fair market value that ignores an undisclosed deviation is not a defensible number. If the Income Tax Department or a bank later discovers the mismatch, a valuation that priced the entire structure as fully compliant can be challenged, potentially reopening a settled tax computation or a completed loan file.
| Scenario | Likely Impact |
|---|---|
| Minor deviation (small setback encroachment, cosmetic change) | Usually manageable; valuer notes it, bank may still lend against most of the property |
| Unauthorized extra floor or major built-up area excess | Excess area excluded from valuation and loan; resale value materially reduced |
| Active CMDA notice (locking, sealing, or demolition) | Severe risk; most banks will decline to lend, and resale becomes very difficult |
| Fully approved structure matching sanctioned plan | No deviation-related impact; valuation proceeds on standard terms |
Get a certified valuation that verifies the approved plan against the actual construction, so your loan, resale, or tax filing doesn't run into problems later.