More money is lost in Indian real estate to a misunderstood area definition than to almost anything else. A buyer compares two projects at ₹9,000 and ₹13,500 per sq.ft., concludes the first is cheaper, and never asks the only question that matters: per square foot of what? The rate is not a price. It is a fraction, and the denominator is chosen by the seller. This page sets out the definitions, works a real example, and gives you a short checklist for taking apart a quotation.

The Four Numbers

Plot area

The land. A rectangle with dimensions, a survey number and boundaries, described in the sale deed. At Nambiar Beverly Park a 40 × 63 ft plot is 2,520 sq.ft. and a 35 × 55 ft plot is 1,925 sq.ft. This is the least ambiguous number in the transaction and the one buyers pay least attention to.

Carpet area

The only area with a statutory definition. Section 2(k) of the Real Estate (Regulation and Development) Act, 2016 defines carpet area as the net usable floor area of an apartment, excluding the area covered by external walls, areas under service shafts, and exclusive balcony, verandah or open terrace areas — but including the area under internal partition walls. It is the floor you can actually stand on. Under RERA, apartments must be sold and quoted on this basis.

Built-up area

Carpet area plus the walls themselves and, usually, the balcony. Not statutorily defined, and used loosely.

Saleable or super built-up area

The commercial number. It takes built-up area and loads a proportional share of common elements onto it. RERA does not define it. In an apartment it typically runs 25 to 35% above carpet area. In a villa scheme it is defined by the developer, and the definition varies from project to project — which is precisely why rates across projects are not comparable until you have both definitions in front of you.

One important caveat for villa buyers: RERA's carpet-area mandate was written for apartments. A villa on its own plot is a different product, and schemes of this type are commonly quoted on a developer-defined saleable area. That is not improper, but it does mean the number is not standardised, and it puts the burden of asking on you.

What the Ratio Does to a Quote

Here is the arithmetic on the actual configurations at Nambiar Beverly Park.

• A 40 × 63 plot of 2,520 sq.ft. carries a saleable area of 4,627 sq.ft. east facing or 4,638 sq.ft. west facing — a ratio of about 1.84×.
• A 35 × 55 plot of 1,925 sq.ft. carries 3,732 sq.ft. west facing or 3,782 sq.ft. east facing — about 1.94× to 1.96×.

Now apply the indicative rate of ₹13,499 per sq.ft. of saleable area to the larger villa. Against saleable area: 4,638 × ₹13,499 ≈ ₹6.26 Cr. Against plot area, if you had wrongly assumed the rate applied to land: 2,520 × ₹13,499 ≈ ₹3.40 Cr.

Same rate, same villa, a difference of roughly ₹2.9 Cr — because the denominator changed. That is the entire lesson. Nothing about the ratio here is unusual: a G+2 house on a compact plot is expected to have a saleable area close to twice its land, because it has three levels. But if you carry a rate from one project to another without carrying its definition, your comparison is meaningless.

The reverse error is just as common and works in the seller's favour. A project quoting a low headline rate may be applying it to a generously defined saleable area; a project quoting a higher rate may be applying it to a tighter one. The only reliable comparison is total price against total delivered house — not rate against rate.

How to Take a Quotation Apart

1. Ask which area the rate applies to, and get the definition in writing. "Saleable area" on its own is not an answer. Ask what is included in it and in what proportion.
2. Ask for the plot area separately, with dimensions and the survey number, and check it against the plan and eventually the deed. This is the number your land value rests on.
3. Ask for carpet or built-up area as well. If a developer can state saleable area to the square foot but cannot state carpet area, that is informative in itself.
4. Recompute the rate yourself against each denominator. Total price divided by plot area, and divided by saleable area, gives you two very different rates. Compare projects only on the same one.
5. Separate the rate from the charges. A quotation is rarely just area × rate. At this project the basic sale value is built as saleable area × rate, plus a development and infrastructure charge, plus a preferential-location charge where one applies, with 5% GST on the total. Registration, stamp duty and maintenance are outside that figure. Ask for each line separately, and ask which are already inside the headline number — assuming a charge is extra when it is already included overstates your cost, and assuming the reverse understates it.
6. Check the numbers survive into the documents. The areas in the cost sheet should match the areas in the allotment letter, in the agreement to sell, and — once a project is registered — in its filings on the Karnataka RERA portal. If they diverge, the document governs, not the cost sheet.

Two Things Saleable Area Does Not Drive

First, stamp duty and registration are computed on the consideration or the applicable guidance value for the property, not on a saleable-area figure invented for pricing. Second, property tax is assessed by the local authority on its own basis. So a high saleable-area multiple does not mechanically raise those costs. It does, however, raise anything charged per square foot of saleable area — and at this project maintenance is charged that way, at ₹48 per sq.ft. for the first year including 18% GST, with a deposit of the same amount. On a 4,638 sq.ft. villa, that is a recurring cost worth modelling before you sign.

The Short Version

A rate is a claim about two numbers. Never accept the first without the second. Ask what the denominator is, get the definition in writing, recompute the rate both ways, and compare only total price against total house. That single habit will tell you more about a project's pricing than any market report.

Where to Go Next

The full cost stack for this project, including what the headline figure already absorbs, is on the Nambiar Beverly Park price page; plot sizes and saleable areas by configuration are on the villas page. Other explainers are indexed on the blog. All figures quoted here are indicative and subject to change.