Two apartment projects on the same Bengaluru arterial can look identical in a brochure and yet be very different buildings, because one sits on a wider road and is allowed far more floor area than the other. That single planning number, the floor area ratio, decides how tall and how dense a project can legally be, and whether the extra floor a developer is selling you actually exists on the sanctioned plan. Understanding it is one of the least glamorous but most protective things a buyer can learn. The floor area ratio Bengaluru rules assign to a plot quietly govern the whole shape of a project, long before the show flat is built.

Here is the quick fact worth keeping: in Bengaluru the floor area ratio, or FAR, is governed by the BDA and BBMP under the Revised Master Plan 2015, and the base FAR broadly ranges from about 1.25 to 4.0 depending mostly on the width of the road your plot faces.

The short answer. The floor area ratio Bengaluru authorities allow on a plot is the ratio of total built floor area to plot area, and it decides how much can legally be constructed. The benefit of understanding it is that you can tell whether the density you are buying into is sanctioned or stretched. The trade-off is real, a higher FAR means more saleable flats and often a lower price per unit, but also more families per acre, more pressure on parking, water, and lifts, so more FAR is not automatically better for the people who live there.

What is floor area ratio, and why should a Bengaluru buyer care?

Floor area ratio is the ratio of a building's total floor area to the area of the plot it stands on, and it is the main lever a city uses to control density. In India, FAR and FSI, the floor space index, mean the same thing. A plot of 1,000 square metres with a FAR of 2.0 can carry 2,000 square metres of built floor area, spread across whatever number of floors the rules and setbacks allow. The higher the FAR, the more can be built, and the denser the development.

A buyer should care because FAR quietly shapes daily life and value. It determines how many flats share the same land, the lifts, the parking, and the water supply, and it affects the open space around you. It also decides whether the top floors a developer is selling are legitimately sanctioned or an over built excess. A project that has quietly exceeded its permitted FAR carries real risk, so reading this number is part of judging both the living experience and the legal safety of a home.

How is FAR determined in Bengaluru?

FAR in Bengaluru is determined mainly by the plot's zone under the master plan and the width of the road it faces, with wider roads allowing a higher FAR. The city's planning area is broadly split into ring zones, a core area, an inner urban band, and an outer urban band, and the Revised Master Plan 2015 sets the base FAR for each situation. Road width is the single biggest swing factor, which is why two adjacent plots can carry very different permissions if one faces a wide road and the other a narrow lane.

Because so much depends on the specific plot, the survey number, the zone, and the exact road classification, the base range of roughly 1.25 to 4.0 is only a guide, not a promise for any given site. The rules also change, a Karnataka gazette notification amended FAR provisions in February 2025 and drew formal objections from citizen groups, and a draft Revised Master Plan 2031 is under preparation. For any real plot, the only safe figure is the one confirmed with the BDA or BBMP for that survey number.

What are premium FAR and TDR?

Premium FAR and TDR are two legitimate ways a developer can build beyond the base FAR, and both should show up on the sanctioned plan. Premium FAR is additional floor area ratio granted over the base, in return for paying premium charges to the authority, and it is generally available where a wider road can support the extra density. The Revised Master Plan 2015 zonal regulations were amended to add a dedicated chapter on premium FAR granted by levy of premium charges.

Transferable development rights, or TDR, are the other route. When land is surrendered for a public purpose such as road widening, the owner can receive development rights that can be loaded as extra FAR onto another eligible plot. For a buyer, neither premium FAR nor TDR is a problem in itself, they are how many legitimate towers reach their height. The question to ask is simply whether the extra density was properly sanctioned and paid for, or whether the additional floors are unauthorised, because only the sanctioned version protects you.

What do changing floor area ratio Bengaluru rules mean for buyers?

Changing floor area ratio Bengaluru rules mean a buyer cannot rely on a figure heard a few years ago, because the permissions themselves move. The February 2025 gazette notification amended FAR provisions, citizen groups filed formal objections to it, and a draft Revised Master Plan 2031 is being prepared that could reset the bands again. In a city that keeps revisiting how much density to allow, the safe assumption is that the rule you half remember may no longer be current.

For a buyer, the practical response is simple, treat FAR as a live figure to confirm rather than a constant to assume. When a developer cites a generous FAR to justify extra floors, ask which notification and which master plan provision it rests on, and confirm that the sanctioned plan reflects it. The point is not to master planning law, but to refuse to let a shifting number be used as a vague justification for density you cannot see approved on paper.

What happens if a building exceeds its sanctioned FAR?

A building that exceeds its sanctioned FAR is in plan deviation, and that is where the real risk to a buyer sits. Unauthorised floor area is not a paperwork detail, because it can block the occupancy certificate, invite penalties, and in serious cases expose the excess construction to demolition. A flat that sits within an over built portion can be harder to finance, harder to insure, and harder to resell, since the problem travels with the property rather than the developer.

This is why FAR reading and plan compliance go together. You can explore the practical consequences in our explainer on plan deviation risks in Bengaluru, and on why the occupancy certificate and completion certificate matter so much, since a building that has quietly overshot its FAR often struggles to obtain them. The lesson is not that density is bad, but that density must be sanctioned, and the sanctioned plan is the document that tells you which it is.

How do you check FAR and the sanctioned plan before buying?

You check by asking for the sanctioned building plan and reading it against what is actually built, rather than taking the marketing floor count on trust. The sanctioned plan names the approving authority, the permitted floors, and the built area, and a compliant project will have nothing to hide in producing it. Where the built form looks denser than the sanction suggests, or where extra floors appeared late, that gap is the finding worth chasing before you pay.

When you evaluate a specific home, such as a project like SNN Raj Azaleas on Haralur Road, treat FAR and the sanctioned plan as part of the same check as title and RERA. You can also read the underlying rules yourself through public records such as the Bengaluru FAR rules notification of 2025. Use the seven point routine below to keep the check disciplined.

1. Ask for the sanctioned building plan and note the approving authority, BDA or BBMP.
2. Confirm the plot's ring zone and the road width used in the sanction.
3. Check whether the number of floors and the built area match the sanctioned FAR.
4. Ask whether premium FAR or TDR was used to reach the built density.
5. Verify the current FAR rules for that survey number with BDA or BBMP.
6. Treat any floor or area beyond the sanction as a plan deviation risk.
7. Confirm the occupancy certificate, which a compliant FAR helps the project secure.

What is FAR or FSI in Bengaluru?

FAR, or floor area ratio, is the ratio of a building's total floor area to its plot area, and FSI, the floor space index, means the same thing in India. It controls how much can be built on a plot, so a higher FAR allows more floor area. In Bengaluru it is set by the BDA and BBMP.

How is FAR decided for a Bengaluru plot?

FAR is decided mainly by the plot's ring zone under the Revised Master Plan and the width of the adjacent road, with wider roads generally allowing a higher FAR. Base FAR in Bengaluru broadly ranges from about 1.25 to 4.0, but the exact figure depends on the specific plot, so verify it with the BDA or BBMP.

What is premium FAR in Bengaluru?

Premium FAR is extra floor area ratio a developer can obtain above the base by paying premium charges to the authority, usually where a wider road allows it. Transferable development rights, or TDR, are another way extra FAR is loaded onto a plot. Both must be reflected in the sanctioned plan to be legitimate.

Why should a buyer check FAR before buying?

Because a building constructed beyond its sanctioned FAR is in plan deviation, which can block the occupancy certificate, invite penalties, and even risk demolition of the excess. Confirming that the built floors and area match the sanctioned FAR protects your title, your home loan, and your resale value.

Last updated 2026-07-09. PropNewz Team.