Along any fast-growing corridor like GST Road, approved and unapproved layouts tend to sit side by side, often at similar-looking prices, which is exactly what makes the distinction easy to miss and expensive to get wrong. DTCP (Directorate of Town and Country Planning) approval means a layout has been reviewed and cleared against Tamil Nadu's planning regulations — road widths, park space, drainage, and infrastructure standards among them — before a single plot is sold.
An unapproved layout can look identical from the road. The difference shows up later: getting a bank loan against an unapproved plot is difficult or impossible, since most lenders require DTCP (and where applicable, RERA) approval before they'll finance a purchase. Building a house later can also run into approval problems with the local authority, since construction permits typically depend on the underlying layout being legally recognized. And resale — the moment most buyers actually think about what they own — is where an unapproved plot's lower price often turns out not to have been a discount at all.
Three checks worth making on any plot purchase in this corridor, not just at Growth Town: ask for the DTCP approval number and verify it rather than accepting "approved" as a description; ask whether RERA registration applies and what its status is; and get the layout plan and confirm the specific plot number and boundaries match what's being sold, not just the project name.
A DTCP-approved, bank-loan-eligible layout costs more upfront than an unapproved one nearby for exactly this reason — the risk has already been cleared before you buy, not left for you to discover later.