What Is FAR in Real Estate? Meaning, Formula, Calculation & Bengaluru Rules
FAR shows up in building plans, property documents, sometimes buried in a project brochure. Most buyers scan past it. That tends to be a mistake.
It tells you how much floor area can be built on a plot. Straightforward as a concept, but the number alone won't tell you what you can actually construct. Setbacks, height limits, ground coverage rules all cut into that figure. FAR is the upper limit, not the final answer.
What is FAR in real estate?
FAR stands for Floor Area Ratio. It is the ratio between a building's total floor area (counted under applicable rules) and the area of the plot.
Say you have a 2,000 sq. ft. plot and the FAR that applies to it is 2:
2,000 × 2 = 4,000 sq. ft.
That's 4,000 sq. ft. of floor area permitted on that plot. It doesn't all go on one floor. It gets distributed across however many floors you build, and every floor still has to meet the other building rules. 4,000 sq. ft. is the ceiling.
What does this actually mean if you own a plot?
Let's say you have a 30 × 40 ft site, that's 1,200 sq. ft. You want to build a house. Before you decide how many floors to plan for, you need to know what's actually permitted. Setbacks alone will take a bite out of how much ground you can cover. Then there's the height limit, ground coverage, parking requirements. FAR is one piece of all that.
Knowing the FAR tells you the maximum floor area you're working with. The other rules tell you whether you can actually achieve it.
The FAR formula
FAR = Total floor area counted under FAR ÷ Total plot area
Or if you already know the permitted FAR and want to find out your buildable area:
Permitted floor area = Plot area × Permissible FAR
An example
Say the plot is 2,400 sq. ft. and the FAR that applies comes out to 2.25:
Particular | Calculation |
|---|---|
Plot area | 2,400 sq. ft. |
FAR | 2.25 |
Floor area under FAR | 2,400 × 2.25 |
Result | 5,400 sq. ft. |
5,400 sq. ft. of floor area under FAR. Whether you can actually use all of it depends on setbacks, height, coverage, parking. The full set of building rules, not just FAR.
The 2.25 is just to show the math. What's actually permissible for your property is a separate question. It depends on the location and which regulations apply there.
What affects the FAR for a property in Bengaluru?
Bengaluru doesn't run on a single FAR figure. Road width matters, plot size matters, how the land is classified matters. So does which authority covers that area. BBMP has its own norms. BDA layouts work under different rules. A plot on a 60-foot road will often be permitted more floor area than one on a 30-foot road in the same area, even if the two plots are otherwise comparable.
That's why two sites that look alike on paper can end up with very different construction potential. Different road, different jurisdiction. The numbers change. Most buyers skip this check, then find out the hard way.
Corner plots add another layer to this. They often face setback requirements on two road-facing sides, which further constrains what you can actually build. If you're considering one, corner house pros and cons is worth reading before you commit.
A commercial building nearby and your residential plot are operating under entirely different FAR rules. What was allowed there has no bearing on what's allowed on yours.
The building rules that come with FAR
FAR doesn't work alone. Any building in Bengaluru also has to comply with:
Setbacks (mandatory open space on each side of the building)
Ground coverage (how much of the plot can actually be built over at ground level)
Building height, which can also be tied to road width
Parking requirements
Fire safety norms
The sanctioned building plan
If you're planning to construct, don't try to work backwards from FAR to figure out your final construction area. Get an architect who actually knows the building rules for that area. Bengaluru has enough variation across localities that going by what someone built nearby is not a reliable guide.
What is premium FAR?
Sometimes you'll see this mentioned in project brochures or news about real estate development. Premium FAR refers to additional floor area beyond the base permissible limit. It can be used by eligible projects after paying the prescribed charges and getting it formally approved by the relevant authority.
Two things to be clear about here. Paying the premium FAR fee is not the same as getting approval to build more. The extra construction has to be reflected in the sanctioned plan. And if you're buying an under-construction apartment, don't take the developer's word for it. Ask to see the approval documents and check that the additional area actually appears in the sanctioned plan. Under-construction projects in Karnataka are also required to be registered under RERA Karnataka. Checking the project's registration there is a sensible first step before anything else.
Why apartment buyers should care about FAR
If you're buying a flat, you probably won't calculate FAR yourself. That's fine. But understanding it helps you ask better questions. In Bengaluru's apartment market, asking the right questions is worth a lot.
The permitted floor area on a project's land shapes everything: the number of towers, the number of units, how the site is laid out. In a large project, it helps you understand the scale of what the developer is actually allowed to build, not just what they're promising.
More practically, it helps you verify the sanctioned plan. Don't rely on the brochure or the sales presentation. Ask to see the approved building plan, the one the authority has signed off on. Going through site visit dos and don'ts in Bengaluru before your visit helps you know what to look for on the ground. If what's going up on site doesn't match what was approved, that's a serious red flag. Genuine projects generally have no problem showing you the documents.
For people buying plots, FAR matters most directly. A site can look big enough for your plans while the building rules allow significantly less construction than you're imagining. Find out those limits before you buy.
FAR and ground coverage: people confuse these
They're related but different.
FAR | Ground coverage |
|---|---|
Total floor area across all counted floors vs plot area | The building's footprint on the ground vs plot area |
Controls how much total floor space gets built | Controls how much of the plot gets covered at ground level |
A building can sit on a relatively small footprint but go many floors up, which is why both limits exist independently. You have to meet the ground coverage requirement and the FAR requirement. One doesn't substitute for the other.
FAR and FSI: are they the same thing?
Mostly. FAR is Floor Area Ratio; FSI in Bangalore real estate goes by Floor Space Index. In practice, people use them interchangeably to describe the ratio of permitted floor area to plot area. A 1,000 sq. ft. plot with a ratio of 2 gives you 2,000 sq. ft., regardless of which term is used.
Which term you'll see depends on the location and the regulations. Some regulations use one, some use the other. Check how the rules for your property define it.
Does FAR affect property value?
It can, though indirectly. FAR determines how much can be developed on a piece of land, which affects how useful that land is to a builder or owner. A plot with a higher permissible FAR can generally support more construction than an otherwise similar plot with a lower one, and that can be reflected in price.
That said, FAR alone shouldn't drive an investment decision. Where the property is, what's around it, whether the title is clean, what the market actually wants. FAR is one variable in a much longer equation.
What to actually verify before buying
If FAR matters to your purchase (and for most plot buyers it should), don't stop at the number the seller gives you.
For an apartment, ask for:
The sanctioned building plan
Project approvals
Approved number of floors and units
Construction area as shown in the approved plan
Occupancy Certificate (if the project is complete or near completion)
Documents for any revisions to the original sanctioned plan
For a plot, check:
Land-use classification
Road width (it affects permissible FAR directly)
Permissible FAR for that specific plot
Setback requirements
Ground coverage limits
Height restrictions
Any other applicable construction requirements
If the plot is on B Khata, that has its own implications for what you can build and what approvals you can get. B Khata to A Khata conversion in Bangalore explains what that classification means and what the conversion process involves.
For a broader document checklist that goes beyond FAR, documents to check before buying a home in Bangalore covers the full picture.
If any of this is unclear for the property you're looking at, have an architect who knows Bengaluru's building rules go through it, or go directly to the authority. Not someone who'll give you a rough estimate. Someone who'll actually check.
What alldoors suggests
When buying property in Bengaluru, judge by the sanctioned documents, not by what you can see on site or what the brochure says.
If you're buying a plot, confirm the FAR and all the applicable building rules before you decide what you want to build on it. A plot that looks right for a G+3 house might only permit a G+1 under the rules that apply to it.
Buying an apartment? Cross-check what's going up on site against what was actually approved. Any significant difference needs an explanation and supporting documents.
FAR tells you what can be built. The sanctioned plan and approvals tell you what's actually been permitted for that specific property.
