Buying Near an Underground Namma Metro Line: The 11-Metre Influence Zone

A Bengaluru family finds an old independent house a short walk from an underground Namma Metro station. The plan is simple: buy it, knock it down, and build three floors with a borewell in the setback. That plan runs straight into a notification most buyers have never read. Since May 2020, a strip 11 metres wide on either side of the metro's underground structures has been the "Influence Zone of Bangalore Metro", and almost nothing can be built, drilled or demolished inside it without the metro corporation's consent.

The short answer. A Karnataka government notification dated 11 May 2020 declares 11 metres in plan from the outer edge of the metro's underground structures (tunnel, ramp or station), on either side and including the width of the structures, as the Influence Zone of Bangalore Metro. In that zone, no new construction, drilling of boreholes, or demolition, modification or alteration of existing structures is permitted without BMRCL's consent, and a BMRCL No Objection Certificate is mandatory before other civic agencies such as BDA, BBMP and BWSSB grant statutory approvals. The trade-off: being close to an underground station is convenient, but a property inside the zone carries an extra approval step for any future rebuilding or borewell.

What exactly is the metro influence zone?

It is a protective strip around the underground parts of the network. The Karnataka Gazette notification published on 12 May 2020, issued by the Urban Development Department, says the government, keeping in view the safety of the structures of Namma Metro, declares that 11 metres of width in plan from the outer edge of the metro underground structures, tunnel, ramp or station, on either side including the width of the structures, is the "Influence Zone of Bangalore Metro".

The notification says it is issued under Sections 20 and 21 of the Metro Railways (Construction of Works) Act, 1978. It applies to underground structures. The BMRCL influence zone page repeats the 11-metre rule for underground sections, links to a map of those sections, and says the NOC from BMRCL is mandatory for undertaking any activity in the zone.

For a buyer, the key fact is the trigger. The zone is defined by distance from the outer edge of an underground tunnel, ramp or station, not by distance from a station entrance. A property can be some way from the nearest entrance and still sit above or beside a tunnel.

What is not allowed inside the zone without BMRCL's consent?

Four kinds of work. The notification states that no new construction of structures, drilling of boreholes, or demolitions, modifications or alterations of existing structures in the Influence Zone of Bangalore Metro is permitted without the consent of BMRCL.

It then adds that a No Objection Certificate shall be obtained from Bangalore Metro Rail Corporation Limited for any activity in the zone, and that this NOC is mandatory for granting statutory approvals from other civic agencies such as BDA, BBMP and BWSSB or any other such agencies.

Read that list against a typical buyer's plans. Rebuilding an old house is new construction and demolition. Adding a floor is a modification. A borewell is drilling. Even a substantial renovation can count as an alteration. Each of these needs BMRCL's consent if the property is inside the zone, and the civic approvals that follow depend on the NOC.

Who is most affected: flat buyers or plot and house buyers?

Plot and independent house buyers carry the most direct risk, because they are the ones who will build, rebuild or drill. If you are buying land or an old house inside the zone with a plan to redevelop, BMRCL's consent is part of your approval path, and the civic approvals depend on it.

Flat buyers in a new project are affected differently. If the project site falls inside the zone, the developer's approvals should already include the BMRCL NOC, because the notification makes it mandatory before other civic agencies grant statutory approvals. Your job is to ask for evidence of it. If the developer cannot produce it, treat that as a question about the project's approvals, and check it against the sanctioned plan.

Resale flat buyers in older buildings near an underground stretch should think about the future. A society that later wants to redevelop, add a lift shaft or make structural changes may need BMRCL's consent if the building is inside the zone. That is not a reason to avoid the flat, but it is a factor in how quickly any future redevelopment could move.

PropNewz has covered the approval side of a project in our guide to what a sanctioned plan means and what to ask.

Does the zone stop you from buying or selling?

Not on the face of the notification. The 2020 text lists the activities that need BMRCL's consent: new construction, drilling of boreholes, and demolition, modification or alteration of existing structures. It also requires a BMRCL NOC for any activity in the zone before other civic agencies grant statutory approvals. It does not mention the sale, purchase or registration of property as such.

So the influence zone is best understood as a condition on what you can do with the property after you buy it, not a bar on owning it. That distinction matters for price. A house that its buyer intends to live in as it is may be little affected. A plot bought purely to build on, or an old house bought to demolish and rebuild, depends on BMRCL's consent for the plan that justified the price.

If the seller's pitch is built on redevelopment potential, ask how that potential was assessed and whether BMRCL was consulted. A seller who has already obtained an NOC for a proposed plan is in a stronger position than one who has not, and the difference should show up in the negotiation.

The same logic applies to lenders. A bank's technical valuation of a plot inside the zone may reasonably ask whether the intended construction can be approved. Have your BMRCL correspondence ready when the valuer visits.

How do you check whether a property is inside the zone?

Start with BMRCL's own map. The notification says the Influence Zone of Bangalore Metro is made available on the BMRCL website for public access, and the BMRCL influence zone page links to a map of the underground sections. Locate the property on it and note how close it is to the marked tunnel, ramp or station.

If the property is near the line, ask BMRCL directly. The influence zone page lists pd@bmrc.co.in as the contact for the zone. A written reply confirming whether the plot falls inside the 11-metre strip is better evidence than a seller's assurance or a broker's guess.

Then check the paperwork. For a new project inside the zone, ask the developer for the BMRCL NOC alongside the building plan approval. For a house or plot, ask the seller whether any past construction, borewell or alteration had BMRCL consent, especially if the work happened after May 2020.

Does this matter for the next metro phase?

It could, once tunnels are built. The notification is framed around the metro's underground structures. BMRCL's upcoming projects page lists Phase 3A from Sarjapura to Hebbal at 36.59 km, of which 14.45 km is shown as tunnel and 22.14 km as elevated, with 11 underground and 17 elevated stations, and notes that the detailed project report is being prepared.

Because Phase 3A is still at the DPR stage on BMRCL's page, nobody can yet point to a final underground alignment for it. A buyer looking along that corridor, for example near DNR Sarjapur on Sarjapur Road, should not assume either way. Ask BMRCL whether any notified alignment or zone affects the property, and recheck once the DPR is approved. Our coverage of the Pink Line's safety inspection tracks the line that is closest to opening.

What should a Bengaluru buyer do before signing?

Work through this list for any property near an underground metro section.

1. Locate the property on the influence zone map linked from BMRCL's influence zone page.
2. Measure, or ask a surveyor to confirm, its distance from the outer edge of the nearest tunnel, ramp or station.
3. If it may be within 11 metres, write to pd@bmrc.co.in for confirmation.
4. For a new project, ask the developer for the BMRCL NOC alongside the sanctioned plan.
5. For a house or plot, ask whether any construction, borewell or alteration after May 2020 had BMRCL consent.
6. If you plan to rebuild, add floors or drill a borewell, budget time for the BMRCL NOC before civic approvals.
7. Keep BMRCL's reply and the NOC, if any, with your title documents for future resale.

Frequently asked questions

How wide is the Namma Metro influence zone?

The Karnataka notification of 11 May 2020 sets it at 11 metres of width in plan from the outer edge of the metro's underground structures, meaning the tunnel, ramp or station, on either side and including the width of those structures. It is called the Influence Zone of Bangalore Metro and applies to the underground parts of the network.

Can I drill a borewell near an underground metro line in Bengaluru?

Not inside the influence zone without BMRCL's consent. The 2020 notification says no drilling of boreholes, new construction, or demolition, modification or alteration of existing structures is permitted within the Influence Zone of Bangalore Metro without the consent of Bangalore Metro Rail Corporation Limited.

Is a BMRCL NOC needed for building plan approval?

For activity inside the influence zone, yes. The notification says a No Objection Certificate shall be obtained from BMRCL for any activity in the zone, and that this NOC is mandatory for granting statutory approvals from other civic agencies such as BDA, BBMP and BWSSB or any other such agencies.

How can a buyer find out if a property is in the metro influence zone?

The notification says the zone is published on the BMRCL website for public access, and BMRCL's influence zone page links to a map of the underground sections. Locate the property on that map and, if it is close, write to the contact listed on the page, pd@bmrc.co.in, for written confirmation.

Last updated 2026-10-24. PropNewz Team.