MOFA Carpet Area vs RERA Carpet Area: What Changed and How to Convert

Q: What do you mean by MOFA carpet area?

MOFA carpet area is the carpet area concept used under the Maharashtra Ownership Flats Act, 1963, the law that governed Maharashtra flat sales before RERA. It generally excludes internal partition walls, and in common builder practice balconies were often counted within it. It appears in pre-2017 Maharashtra agreements.

Q: How much difference is there between RERA carpet and MOFA carpet?

Typically 5-10% for the same flat. RERA carpet area includes internal partition walls, which MOFA carpet area generally does not, while MOFA-era practice often counted balconies that RERA explicitly excludes. There is no fixed legal conversion percentage.

Q: How to calculate MOFA carpet area?

Start from the RERA carpet area in the current disclosure and subtract the internal partition wall area (since MOFA generally excludes internal walls). If the old agreement counted the balcony, add the balcony area. Because practices varied, the reliable method is physical measurement, not a fixed percentage.

Q: How to convert MOFA carpet to RERA carpet?

RERA carpet area is approximately MOFA carpet area plus measured internal wall area, minus any balcony area the MOFA figure counted. Use the MOFA to RERA mode in the RERAExam carpet area calculator for a working estimate, and physical measurement for a final figure.

MOFA carpet area (Maharashtra Ownership Flats Act, 1963) generally excludes internal partition walls, and in common builder practice often counted the balcony. RERA carpet area (RERA Act 2016, Section 2(k)) includes internal partition walls and explicitly excludes external walls, balconies, verandahs, service shafts and open terraces. For the same flat the two figures typically differ by around 5-10%. This page explains both definitions, why the difference exists, and how to convert between them when comparing an old MOFA-era agreement with a current RERA disclosure.

What Is MOFA Carpet Area?

Before RERA came into force on 1 May 2017, flat sales in Maharashtra were governed by the Maharashtra Ownership Flats Act, 1963 (MOFA). MOFA required builders to disclose carpet area, but the definition was looser than RERA's and market practice varied: internal partition walls were generally not counted, and many builders included balcony area in the carpet figure they quoted. If you are reading an agreement for sale registered before mid-2017, or resale documents for an older building, the carpet area stated is almost certainly a MOFA-style figure.

What Is RERA Carpet Area? (Section 2(k))

Section 2(k) of the RERA Act 2016 defines carpet area precisely: the net usable floor area of an apartment, including the area covered by internal partition walls, but excluding external walls, areas under service shafts, exclusive balcony or verandah area, and exclusive open terrace area. Every RERA-registered project must disclose this figure on the MahaRERA portal, and all pricing must be quoted on carpet area basis.

MOFA vs RERA: The Key Differences

Aspect	MOFA carpet area (1963)	RERA carpet area (2016)
Internal partition walls	Generally excluded	Included
Balcony / verandah	Often counted in practice	Explicitly excluded
External walls	Excluded	Excluded
Legal precision	Loose - market practice varied	Statutory definition, uniform disclosure
Where you see it	Pre-2017 Maharashtra agreements	All RERA-registered project disclosures

How to Convert Between MOFA and RERA Carpet Area

There is no fixed legal conversion percentage. The reliable relationship is:

RERA carpet area ≈ MOFA carpet area + internal partition wall area − balcony area (if the MOFA figure counted it)

In practice this works out to a difference of roughly 5-10% for typical flats. For anything that matters - a resale comparison, a redevelopment entitlement, a shortfall claim - measure the internal walls rather than applying a percentage. For a quick working estimate, use the MOFA mode in our RERA carpet area calculator.

Why the Difference Matters

Redevelopment offers, resale listings for older societies, and comparisons between an old agreement and a new RERA disclosure all mix the two definitions. A flat marketed as "650 sq.ft. carpet" in a 2010 MOFA-era agreement and "680 sq.ft. RERA carpet" in a redevelopment offer may be essentially the same usable space, with the gap explained entirely by internal walls. Buyers who do not know this either overestimate what they are gaining or wrongly suspect they are being short-changed. Under RERA, any shortfall against the disclosed carpet area at possession triggers a proportionate refund under Section 14(2) - a right that did not meaningfully exist under MOFA.

Carpet area definitions are a guaranteed MahaRERA exam topic.
Section 2(k), loading percentage and the Section 14(2) shortfall remedy appear in every exam cycle.

Practise carpet area questions in a free mock test

Frequently Asked Questions

What do you mean by MOFA carpet area?
The carpet area concept used under the Maharashtra Ownership Flats Act, 1963 - the law governing Maharashtra flat sales before RERA. It generally excludes internal partition walls, and in common practice balconies were often counted within it.

How much difference is there between RERA carpet and MOFA carpet?
Typically 5-10% for the same flat, driven by internal wall thickness and balcony treatment. There is no fixed legal conversion percentage.

How to calculate MOFA carpet area?
Start from the RERA carpet area and subtract internal partition wall area; add balcony area if the old agreement counted it. Physical measurement beats any percentage estimate.

How to convert MOFA carpet to RERA carpet?
RERA carpet ≈ MOFA carpet + measured internal wall area (minus balcony if counted). Use the carpet area calculator's MOFA mode for a working estimate.

Disclaimer: Area relationships described here are typical market patterns, not legal conversion rules. For disputes or claims, rely on physical measurement by a licensed surveyor and the figures in your registered agreement. RERAExam is not affiliated with any government authority.