How close is too close to a lake? Bengaluru’s 30 m buffer, explained
PropEnabler.AI · 28 October 2026
Bengaluru was built around its lakes, and many of the city’s best-looking projects sit beside one. A lake view sells. But a project built inside the protected strip around a lake can face stop-work notices, demolition orders and penalties, and the buyer is the one left holding a home that is hard to sell or finance.
This post explains the rule, how it changed, and what our map shows across 255 projects.
The rule today
Bengaluru’s Revised Master Plan 2015 sets a no-construction buffer around water bodies:
| Water body | No-construction buffer |
|---|---|
| Lake | 30 m from the lake’s edge |
| Primary storm-water drain (rajakaluve) | 50 m from the centre of the drain |
| Secondary storm-water drain | 25 m from the centre |
| Tertiary storm-water drain | 15 m from the centre |
The buffer is for green space and to protect the lake. Building inside it is not allowed.
How it changed
In 2016 the National Green Tribunal, hearing a case over projects between Bellandur and Agara lakes, raised the lake buffer to 75 m and the drain buffers to 50, 35 and 25 m, measured from the edge. Karnataka and the builders appealed. In March 2019 the Supreme Court set aside the larger buffers and restored the master-plan distances above, while upholding the penalties and the order to remove encroachments in that case.
What this means for a buyer: the 30 m lake buffer is the line that matters today, and courts have shown they will act against projects that break it.
What our map shows
GroundTruth measures the distance from every project’s map pin to the nearest mapped lake of half a hectare or more (smaller ponds are usually ornamental). Across 255 Bengaluru projects:
| Distance from a lake | Projects | What we show |
|---|---|---|
| 30 m or less | 3 | Caution: possibly inside the buffer, check the survey map |
| 31 to 100 m | 11 | Caution: check the buffer on the survey map |
| 101 to 200 m | 23 | Caution: lake nearby |
| More than 200 m, or none | 178 | Pass |
| Pin is only the locality, not the plot | 40 | Not checked |
We never mark a project as a red flag from the map alone. A listing pin can be tens of metres off, and our lake outlines come from OpenStreetMap, not the government survey. A pin near a lake is a reason to ask questions, not a verdict.
What to ask before you buy near a lake
- The surveyed lake boundary. Ask for the revenue survey map showing the lake’s official edge, not the water line you see today. Lakes shrink in summer; the legal boundary does not.
- Where the buffer falls on the layout. The approved layout plan should mark the 30 m line. Check that no tower, road or clubhouse sits inside it.
- Storm-water drains. Drains often run beside lakes. A primary drain carries a 50 m buffer from its centre, wider than the lake’s own.
- Court cases and notices. Search for the project and the lake by name in the RERA complaints and in news of stop-work or demolition orders.
- Flood history. Low ground near a lake floods first. Ask residents about the last heavy monsoon.
How GroundTruth uses this
The lake check is one of 12 legal and technical checks on every project card. It feeds the legal and technical risk score, which makes up 15% of the decision score. Storm-water drain buffers and flood exposure are next on our list; today they show as not checked.
This post explains a planning rule in plain language. It is not legal advice; confirm any specific property with a lawyer and the survey records.
Sources: Revised Master Plan 2015 zoning regulations; National Green Tribunal order in Forward Foundation v. State of Karnataka (May 2016); Supreme Court, Mantri Techzone v. Forward Foundation, 2019 SCC OnLine SC 322 (March 2019), as reported by LiveLaw and Deccan Herald; lake outlines from OpenStreetMap.