FSI and FAR in Bengaluru: What Every Home Buyer Should Know

A buyer we will call Deepa was shown a smart four floor building on a 30 by 40 site in a fast growing Bengaluru suburb, with a flat on each floor and a tidy price. What the brochure did not say was that the sanctioned plan allowed far less built-up area than the building actually had. The extra floor space that made the deal look generous was exactly the part that could invite trouble later, from a stalled loan to a notice for unauthorised construction. The number that would have warned Deepa in five minutes was one most buyers never ask about: the floor area ratio.

The short answer. Floor space index, or FSI, and floor area ratio, or FAR, are the same idea: the total built-up area of all floors divided by the plot area. In Bengaluru a common residential figure is around 1.75, so a 1,200 square foot plot broadly allows about 2,100 square feet of built-up area, though the exact FAR varies with the zone, the plot size and the width of the road. The trade-off is simple to state: a building that exceeds its sanctioned FAR may look like more home for your money, but the excess is precisely what banks, buyers and the authority treat as a risk.

What do FSI and FAR actually mean?

FSI and FAR both describe how much you can build on a plot relative to its size. As the guide at Artscape Developers puts it, FAR is the ratio of the total built-up area of all floors to the size of the plot. Their example makes it concrete: a 1,000 square foot plot with an FAR of 1.5 allows 1,500 square feet of total construction across all floors. So FAR is not about a single floor, it is about the sum of every floor, which is why it directly limits how many floors and how much total space a builder can legally create on a given site.

What is the FAR for a typical Bengaluru plot?

For common residential plots a figure of about 1.75 is widely used in Bengaluru. The 2026 norms compiled by Liza Homes put the residential FAR at 1.75, which means a 1,200 square foot site, the popular 30 by 40, allows roughly 2,100 square feet of built-up area. The same guide sets out how that translates into height and floors, with a 1,200 square foot plot typically permitting a stilt plus three floors within a height limit in the range of 12 to 15 metres, and modest setbacks on the front, rear and side. These figures give a buyer a quick sense of what a plot of a given size should legally carry.

Why does FAR vary from one plot to another?

FAR is not a single fixed number across the city, because it responds to the plot and its surroundings. The allowance can differ with the zone, the size of the plot and, importantly, the width of the road the plot faces. The Artscape guide notes that height and FAR rules are relaxed for plots on wider roads, and that on a 24 metre wide road buildings can reach far greater heights than on a narrow lane. This is why two similar sized plots can support very different buildings, and why you should never assume the FAR of one property applies to another nearby. The sanctioned plan for the specific property is the only reliable source.

There is another reason the number moves, which is that authorities sometimes allow additional or premium floor area on wider roads and in certain zones, over and above the base allowance. That is why you may hear of much taller buildings on arterial roads than the modest figures for a small residential plot would suggest. For a buyer the takeaway is not to memorise every band, but to recognise that FAR is context specific and that only the sanctioned plan for the exact property tells you what was actually permitted. A neighbour's taller building is not evidence that yours can match it.

Are balconies counted in the FAR now?

Yes, balcony areas are now counted within the FAR in Bengaluru. Both the Liza Homes and Artscape guides reference a change, tied to a High Court ruling, that requires balcony areas to be included in the FAR calculation. For a buyer this is significant, because a project designed before the change may have counted balconies differently, and a building that added generous balconies could be closer to or beyond its permitted FAR than it first appears. When you compare the built area on paper with what has actually been constructed, keep balconies in mind rather than treating them as free extra space.

Why should a flat buyer care about FAR?

FAR matters to a flat buyer because a building that breaches it carries real, transferable risk. If a builder has constructed more than the sanctioned FAR allows, the unauthorised portion can attract action from the authority, banks may decline to lend against the property, and a future buyer may hesitate, all of which land on whoever owns the flat. The Artscape guide underlines the point by citing the risks of unauthorised modifications. None of this means every extra square foot is dangerous, but it does mean the gap between what is sanctioned and what is built is a gap you want to understand before you pay, not after.

How FAR connects to the area you are sold

FAR also sits behind the area figures in a brochure. The total built-up area a project can offer is capped by the FAR on its land, so aggressive super built-up numbers across many flats should reconcile with the FAR the plot allows. If the marketed area across all units looks larger than the plot and its FAR could support, that is a reason to ask harder questions and to read the sanctioned plan carefully rather than the glossy brochure. The plan is dull reading, but it is the one document that cannot be dressed up for a sale.

How do I check FAR before I buy?

Ask for the sanctioned plan and compare it against what has actually been built. The authority behind these rules in Bengaluru is the municipal and development machinery, now under the Greater Bengaluru framework, and the sanctioned plan is the document that records the approved built-up area for the property. The checklist below sets out a practical order for a buyer.

1. Ask the builder or seller for the sanctioned building plan.
2. Note the plot area and the approved built-up area on that plan.
3. Divide built-up area by plot area to see the sanctioned FAR.
4. Walk the building and compare actual floors and area with the plan.
5. Check whether balconies and extra structures fit within the FAR.
6. Flag any floor or wing that appears to exceed the sanctioned plan.
7. Confirm the occupancy certificate covers the whole building as built.

What should I do if the building exceeds its FAR?

If the built area clearly exceeds the sanctioned FAR, slow down and get expert advice before committing. An excess does not always mean the deal is impossible, since some deviations can be regularised, but it does change your risk and your negotiating position, and it may affect your loan. Ask the seller to explain the discrepancy in writing, have an architect or lawyer review the sanctioned plan against the construction, and make your decision on facts rather than reassurance. Treating FAR as a routine check, like title and the occupancy certificate, keeps you from inheriting a problem the previous owner or builder created. A little diligence at this stage is far cheaper than a legal fight or a forced correction once you already own the home.

Common questions from Bengaluru buyers

What is the difference between FSI and FAR?

There is no real difference; FSI, or floor space index, and FAR, or floor area ratio, refer to the same measure. Both are the total built-up area of all floors divided by the plot area. A plot of 1,000 square feet with a ratio of 1.5 allows 1,500 square feet of total construction across its floors.

What is the FAR for a 30 by 40 plot in Bengaluru?

A common residential figure is about 1.75, which on a 1,200 square foot plot allows roughly 2,100 square feet of built-up area and typically a stilt plus three floors. The exact FAR can vary with the zone, plot size and road width, so always confirm the figure on the sanctioned plan for that specific property.

Why does FAR matter when buying a flat?

Because construction beyond the sanctioned FAR carries risk that passes to you. An unauthorised excess can attract action from the authority, make banks reluctant to lend, and deter future buyers. Checking the sanctioned FAR against what has actually been built is how you avoid inheriting a problem created by the builder or a previous owner.

Are balconies included in the FAR calculation?

Yes. Guides note that, following a High Court ruling, balcony areas are now included in the FAR calculation in Bengaluru. This matters because a building with generous balconies may be closer to its FAR limit than it looks, so treat balcony space as part of the built area rather than as a free extra when you assess a property.

FAR is one of the technical checks that separate a safe purchase from a risky one. Read it alongside our guide to carpet area versus super built-up area, so the space you pay for is clear, and our explainer on reading a builder cost sheet. If you are evaluating a large project such as Sobha Dream Acres, the sanctioned plan and its FAR are worth asking to see.

Last updated 2026-09-04. PropNewz Team.