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For decades before 2016, the single largest grievance among Indian home buyers was the discrepancy between the square footage advertised on glossy marketing brochures and the actual usable floor area handed over on possession day. ### The Historical Abuse of "Super Built-Up Area" Developers routinely applied "loading factors" varying from 25% to as high as 45%. A buyer paying for a "1,800 sq.ft 3BHK" frequently discovered their physical living space was barely 1,150 sq.ft, with the remaining 650 sq.ft attributed to lift lobbies, staircases, generator rooms, and security kiosks. ### Statutory Definition Under RERA Section 2(k) The Real Estate (Regulation and Development) Act 2016 definitively standardized carpet area as: > *"The net usable floor area of an apartment, excluding the area covered by external walls, areas under services shafts, exclusive balcony or verandah area and exclusive open terrace area, but including the area covered by internal partition walls of the apartment."* ### Why the Distinction Dictates Your Real Per-Sq-Ft Cost Consider a flat priced at ₹1 Crore: - **Quoted Super Area**: 1,800 sq.ft @ ₹5,555/sq.ft - **Actual RERA Carpet Area**: 1,200 sq.ft - **Real Effective Price Paid**: ₹1,00,00,000 / 1,200 = **₹8,333/sq.ft** EstateOS automatically audits and calculates the true RERA carpet area and circle-rate parity for every listing on the marketplace, preventing hidden loading markups.

Carpet Area vs Super Built-Up Area: Statutory RERA Calculation & Loading Guide

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