How to Read Your Sanctioned Building Plan Before You Buy or Build

A "sanctioned plan" (also called an approved plan) is the official document that a planning authority — DTCP, CMDA, or the local Corporation — has reviewed and approved for a specific plot. It's a genuinely different document from a builder's marketing brochure floor plan, and the two can differ in ways that matter a great deal, which is exactly why learning to read the sanctioned version yourself is worth the effort.

What a sanctioned plan actually shows

• ✦The approved building footprint and setbacks (mandatory open space around the structure on each side) as measured against the plot's actual survey dimensions
• ✦The approved number of floors and the total built-up area permitted, based on the plot's Floor Space Index (FSI/FAR) allowance
• ✦Parking allocation as approved — how many vehicles the plan accounts for and where
• ✦The approval number, issuing authority, and date, which you can independently verify with that authority

How it can differ from the marketing brochure

A builder's brochure floor plan is a sales document, and it's not unheard of for it to show a layout, amenity, or floor count that's aspirational rather than exactly what's approved — sometimes because the brochure was prepared before final approval and never updated, sometimes because it reflects a later, unapproved modification. Comparing the two directly, room by room and floor by floor, is the only reliable way to catch a discrepancy before you've committed money.

Red flags that signal unauthorized construction risk

• ✦An additional floor built beyond what the sanctioned plan shows — a common way developers add saleable area without going back for re-approval
• ✦Structures built into the mandatory setback space (the open area required around the building), reducing what's actually approved open space
• ✦A significantly different unit configuration on-site than what the sanctioned plan describes
• ✦No willingness from the seller or builder to show you the actual sanctioned plan, only the marketing version

Why this matters beyond the purchase itself

Buying a unit or house that deviates from its sanctioned plan creates real downstream risk: banks can refuse to finance a purchase where the structure doesn't match approved documents, a future sale can hit the same obstacle with the next buyer's bank, and in serious cases, local authorities can order unauthorized construction to be demolished or regularized at cost. None of this is a risk you can fully see just by walking through a finished, furnished unit — it only shows up when you compare the physical structure against the actual sanctioned paperwork.

How to verify independently

The approval number on a sanctioned plan can be verified directly with the issuing authority (DTCP, CMDA, or the local Corporation/Municipality, depending on the plot's location) rather than trusting the paperwork a seller hands you. This is the same verification discipline covered in our documents guide — a sanctioned plan is one more document in the same category as the encumbrance certificate and patta: worth confirming with the source, not just accepting at face value.