MOFA Carpet Area vs RERA Carpet Area: Which Is Larger, and Why
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 |
Want the number rather than the explanation? The carpet area calculator has a MOFA-to-RERA mode that does the arithmetic for you.
Which Is More, MOFA or RERA Carpet Area?
RERA carpet area is normally the larger number. Because RERA counts the internal partition walls and MOFA did not, the same physical flat measures bigger under RERA. A flat sold as 600 sq ft MOFA carpet commonly lands somewhere around 630 to 660 sq ft RERA carpet.
Nothing was built and nothing was gained. The walls were always there; they are simply inside the figure now. The one thing that can push it the other way is a balcony the old MOFA figure counted, because RERA excludes balconies entirely.
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.
Does RERA Override MOFA?
Partly, and the distinction matters if you are arguing about an older agreement. Section 88 of the RERA Act says the Act is in addition to, and not in derogation of, any other law in force. Section 89 says RERA has effect notwithstanding anything inconsistent in any other law. Read together: MOFA was never repealed and still operates, but wherever the two conflict, RERA prevails.
For carpet area that means an agreement signed under MOFA is not rewritten retrospectively. A registered project marketed today must state RERA carpet area, while an older MOFA figure in an existing agreement stays what it was. When both numbers appear in a redevelopment discussion they are usually describing the same flat under two definitions, not two different entitlements.
You can read both provisions in full on our RERA Act 2016 reference.
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 MOFA to RERA carpet area calculator 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.