Carpet, Built-Up and Super Built-Up Area: What You Actually Pay For

Why it matters on a fit-out project

This is the most common source of budget confusion on Indian office projects, and it usually surfaces at the worst moment — when a fit-out quote arrives and appears far higher per square foot than expected.

Often nothing is wrong with the quote. The tenant is comparing a rate priced on carpet area against a floor plate they think of in super built-up terms. On a 30% loading factor, the same total cost looks 30% more expensive per square foot simply because of which denominator is used.

How it is specified in practice

Loading factor is the gap between carpet and chargeable area, expressed as a percentage. A 10,000 sq ft chargeable floor at 30% loading gives roughly 7,700 sq ft of carpet — and that smaller number is what your fit-out, your workstation count and your HVAC tonnage are all actually based on.

Common mistakes

• Comparing two fit-out quotes on different bases. If one contractor prices on carpet and another on chargeable, the cheaper-looking rate can be the more expensive job. Always confirm the denominator before comparing.
• Planning headcount from chargeable area. Seat counts come from carpet area. Using the leased figure overstates capacity by the whole loading factor.
• Assuming loading is standardised. It is not. It varies building to building and is a negotiable lease term.
• Sizing HVAC on the wrong number. Cooling load follows the space you actually occupy and condition. Using chargeable area oversizes the plant and wastes both capital and running cost.
• Not getting the definition written into the lease. Terms vary between landlords. The lease should define exactly what is included, not rely on the common meaning.

Standards referenced

RERA 2016, Section 2(k), gives the statutory definition of carpet area: the net usable floor area within a unit, excluding external walls, service shafts, balconies and verandas, but including internal partition walls.