How Much Can You Build on a Bangalore Plot? Setbacks, Buffers and Checks
Nobody wants to discover after registration that a slice of their new site is off limits. In Bangalore every house must keep open ground along the edges of its plot, and near lakes and drains an even wider zone may be closed to building. Read on for how that open ground is measured, which offices approve it, when inspectors come and what to verify before a plot purchase.
Start With the Water
Land near a lake or drain is where buyers get caught most often. The National Green Tribunal, in 2016, pushed the no-build zone around city lakes out to 75 metres. The Supreme Court cancelled that order on 5 March 2019, and the older Revised Master Plan 2015 figure of 30 metres came back into force.
Later changes followed. An amendment to the tank conservation law, effective 18 February 2026, links the buffer to the size of the lake, so the biggest lakes keep 30 metres while small ones need only a few. In October 2025 drain buffers were trimmed to 15 metres on primary drains, 10 on secondary and 5 on tertiary. Since the numbers keep moving, ask the planning authority for the figure that applies to your lake on the day you buy.
A Khata Is Not a Planning Document
Khata entries record property tax and ownership details, nothing about restrictions. A site can have a spotless khata and yet fall partly inside a buffer. The answer comes only from an architect or planner who finds the survey number on the master plan map.
What an Open Margin Is
Architects call the unbuilt belt between a building's outer wall and the plot line a setback. A plot has a front one on the road side, a rear one, and a pair on the flanks. The house may occupy only the area they enclose.
Such belts bring in daylight and fresh air, give fire tenders and drains room to work, and keep neighbours out of each other's windows. They also leave the street edge clear if the road is widened. In plain terms, the area you buy and the area you may build are different figures.
Rulebooks and Offices
Two sets of rules operate side by side. The bye-laws cover how applications are made and a good many measurements, and the master plan's zoning regulations decide margins for each mix of road width, plot area and permitted use. The 2015 revision of the master plan remains the live one, since the 2031 draft was shelved in 2020.
The offices have changed. A new Greater Bengaluru Authority was formed under the Greater Bengaluru Governance Act, which also led to five city corporations taking over from the BBMP on 2 September 2025. Plots lying beyond those corporations fall under the planning authority of their own area, so identify the sanctioning office first.
Why Two Neighbours Get Different Margins
There is no universal figure, which is why margins vary even inside a layout. The deciding factors are:
- How big the plot is, with large sites asked for deeper clearances
- How wide the road outside is, since broad roads normally demand deeper frontage clearance
- How tall the house will be, because height calls for more surrounding space
- Which land use zone the master plan assigns
- Whether a lake, drain or valley buffer touches the site
- Whether the plot is on a corner and therefore fronts two roads
A local architect should check the latest tables against the actual plot before drawing anything. The single number in a sales leaflet is a starting guess at best.
A 30 by 40 Example
Imagine, only as an illustration, a site of 1,200 sq ft whose clearances are 5 ft in front and 3 ft on the other three sides. The footprint shrinks to 24 by 32 ft, which is 768 sq ft.
FAR, short for floor area ratio, and the height cap then decide how many floors can stack on that footprint. Plots of the same area can end up with quite different homes. Price any plot by what can be built, not just by how big it is.
When Inspectors Arrive
An approved plan lists the clearances the owner has promised, and inspectors hold the structure against it. The first visit arrives once the plinth is complete and before any wall is raised. A building that has strayed into a margin is cheapest to fix at that point, not after the slabs are poured.
The second check comes with the occupancy certificate application. A house that strays from its plan beyond the tolerance can see that certificate held up, and the departure stays in the record for the next buyer or bank. Balconies, sunshades and staircases have limits of their own under the bye-laws, so the architect should measure from the furthest projection that counts.
A Pre-Purchase Routine
Most of this shows up in documents before money moves. Work through the list below with help from an architect and a property lawyer:
- Find out which office will approve a plan for the exact plot.
- Look up the zone assigned to the plot in the 2015 master plan.
- Run the survey number against every kind of buffer.
- Get the architect to derive clearances from planned height, road width and plot area.
- Compute the footprint and the total floor area ahead of price talks.
- Measure the site physically and compare it with the deed and layout plan.
- Carry the approved plan to site visits, especially around plinth stage.
Layouts around Bangalore differ greatly in road width and plot shape, so run the sums for every plot separately. When a builder constructs the home, the clearances are part of the builder's approved plan, and your checks move to the approvals and then the occupancy certificate.
