Reading a Plot’s Area Off the Document, Not the Brochure

SUYUG Infra
Short briefing · 1,135 words · 5 min read · 3 questions answered
In this article · 7 sections
Working out the area of a plot sounds like multiplication and turns out to be document work. The multiplication takes a few seconds. Establishing that the two numbers you are multiplying are the ones the state has recorded takes rather longer, and it is the only part that protects you.
Start with the arithmetic, because it is short
A rectangular plot of 30 feet by 40 feet is 1,200 square feet. A plot of 40 by 60 is 2,400. Convert before multiplying if the two dimensions are in different units, and convert to a single system before comparing two plots.
| Dimensions | Square feet | Square metres | In local units |
|---|---|---|---|
| 20 ft × 30 ft | 600 | 55.7 | 1.38 cents |
| 30 ft × 40 ft | 1,200 | 111.5 | 2.76 cents |
| 33 ft × 33 ft | 1,089 | 101.2 | 1 guntha |
| 40 ft × 60 ft | 2,400 | 223.0 | 1 ground |
Those last two rows are worth keeping: a guntha is a 33-foot square, and a ground is the area of a 40 by 60 plot. The land area converter on this site will run the same arithmetic against your own figures, in both directions.
Where the area is actually written down

Four documents carry an extent, and they carry it for different reasons.
- The registered instrument. The sale deed states the extent conveyed, along with the survey number and the boundaries. This is the operative statement — it is what was transferred.
- The revenue record. In Karnataka, the record of rights for agricultural land records the extent against the survey and hissa number. The record-of-rights provisions of the Karnataka Land Revenue Act, 1964 are sections 127 to 129, and section 133 attaches a presumption of correctness to an entry, which stands until the contrary is proved.
- The survey sketch. Where only part of a survey number is sold, a sketch prepared by the survey department fixes which part. Extent tells you how much; the sketch tells you where.
- The approved layout. For a plotted development, the layout approved by the planning authority carries each plot’s number, dimensions and area, along with the roads and open space.
A brochure is not on that list, and a listing site is not on it either.
The shape problem
Multiplying frontage by depth only works on a rectangle. Corner plots, plots on a curve, plots against a nala or a road widening line, and plots created by subdivision are frequently not rectangles — and a brochure showing two dimensions for a plot with four unequal sides is describing a plot that does not exist.
Two consequences follow. First, take the extent from the record rather than from multiplication whenever the shape is irregular. Second, look at the sketch. A plot with the same area as its neighbour can be far less usable if the buildable envelope inside the setbacks is an awkward shape.
The extent, the built envelope and the usable plot
A plot’s recorded extent is not the area you can build on. Setbacks take a margin off each boundary, and what is left is the buildable envelope. Two plots with the same extent can leave very different envelopes once the setback rules for their respective road widths and plot sizes are applied.
So a plot comparison has three numbers in it, not one: the recorded extent, the shape, and the envelope that survives the setbacks. Only the first appears on a brochure.
When the documents disagree
They sometimes do, and small differences are common in older parcels where the extent has been carried forward through several instruments. The order of authority is what matters.
| Source | Weight |
|---|---|
| Registered instrument | Operative. It states what was conveyed |
| Revenue record | Presumed correct until the contrary is proved |
| Survey sketch | Fixes the position and shape on the ground |
| Approved layout | Governs the plot as a unit of the layout |
| Brochure, listing, hoarding | None. Not a record |
An unregistered document is worth remembering here for a separate reason: section 49 of the Registration Act, 1908 provides that a document required to be registered shall not affect any immovable property comprised in it, nor be received as evidence of any transaction affecting such property, unless it has been registered. An extent written into a paper that was never registered does not become an extent by being written down.
Measure it, then reconcile it
On site, a plot should be measured against the sketch rather than against the boundary wall, because a wall is somebody’s decision and a sketch is the record. Pace the boundaries, check the corner markers against the sketch, and confirm the plot number on the layout matches the plot number on the document.
Then reconcile the three numbers in writing.
- The extent in the registered instrument.
- The extent in the revenue record for that survey and hissa number.
- The area shown on the approved layout for that plot number.
If all three agree, you have a plot. If they do not, the gap has to be explained by a document, not by a person.
What to ask for, in order
- The survey number and hissa number, so everything else can be looked up against it.
- The extent as the revenue record states it, in its own words.
- The survey sketch, where the plot is part of a larger survey number.
- The approved layout drawing showing this plot number and its dimensions.
- The encumbrance record for the parcel. Under section 57 of the Registration Act, 1908 the registering officer’s books and indexes are open to inspection and copies may be obtained, which is what makes an independent check possible at all.
The purchase sequence these documents belong to, stage by stage, is set out in the buyer guide, and each term is defined in the glossary. For plotted land specifically, the jurisdiction, regulator and register that apply on the Tamil Nadu arm of the corridor are on the villa plots page — which register applies changes the moment the state line does.
Frequently asked questions
Multiply the two dimensions after converting both to the same unit. A plot of 30 feet by 40 feet is 1,200 square feet. The arithmetic is the easy part; confirming that those are the dimensions the documents record is the work.
Then the dimensions on a brochure cannot give you the area, and the survey sketch is the only document that describes the shape. Take the extent from the record and the shape from the sketch, rather than multiplying two frontage figures.
The registered instrument and the revenue record are what a court and a registrar work from. A brochure and a layout drawing are not records of anything. Where a document states an extent, that stated extent governs.
Was this useful?
Comments
Was this useful?
Schedule a site visit
Leave your details and the team will call back to fix a convenient date.
