Bengaluru is unusual among Indian cities for one reason: it doesn’t have just one aerodrome to check against. It has four. Any project going up in Devanahalli, Koramangala, Yelahanka, or the wider North Bengaluru growth corridor needs to be checked against whichever of these aerodromes governs that specific plot, and sometimes more than one applies at once.

This page covers what an Airport NOC survey Bengaluru project actually needs. That includes the city’s four-aerodrome CCZM structure, the exact AMSL math AAI uses to calculate permitted height, and a real demolition case that shows what happens when that math is submitted wrong.

Bengaluru’s Four-Aerodrome CCZM Structure

Most Indian cities deal with a single airport’s Colour Coded Zoning Map. Bengaluru’s CCZM covers four aerodromes at once, and each has its own Aerodrome Reference Point (ARP) and its own 20 km regulated radius:

• Kempegowda International Airport (KIAL) at Devanahalli — the city’s primary international airport, sitting at 915 m AMSL
• HAL Airport in Koramangala — a legacy commercial and defence-linked airfield inside the city core
• Jakkur Government Flying Training School (GFTS) — a smaller aerodrome with its own regulated zone
• Yelahanka Defence Aerodrome — an Indian Air Force station with independent restrictions

Because these zones overlap in parts of North Bengaluru, a single plot in Yelahanka or Hebbal can fall within both KIAL’s civil zone and Yelahanka’s defence buffer. When that happens, both authorities’ requirements apply, and each follows a different process. For the defence side, see our Defence IAF height clearance NOC page for how that application differs from AAI’s civil route.

The AMSL Mistake That’s Already Cost Bengaluru Developers

Bengaluru’s most expensive airport-zone mistakes haven’t come from developers building too tall on paper. They’ve come from getting the site’s ground elevation wrong.

In the Raheja Vivarea case in Koramangala, the builder submitted an AMSL figure of 870 metres for the site. Karnataka High Court later ordered the developer to remove seven floors from the completed complex, at the developer’s own cost. The lesson isn’t subtle: a wrong AMSL figure on your certificate doesn’t just delay your NOC. It can trigger a demolition order years after the building is occupied.

This is why the underlying site elevation survey matters as much as the NOC application itself. AAI calculates your permitted building height by subtracting your verified ground elevation from the Permissible Top Elevation (PTE) for your grid cell. Get the ground elevation wrong, and every height calculation built on top of it is wrong too.

How Permitted Height Is Calculated in Bengaluru

AAI’s height math around Bengaluru’s aerodromes follows a layered structure, and it changes depending on how close your plot sits to the runway:

• Within 5 km of any aerodrome’s ARP — height is capped at 45 metres above ground level (AGL), roughly 14 floors, regardless of your site’s AMSL
• Beyond 5 km — permitted height increases under the conical surface rule, by approximately 1 metre for every 20 metres of additional distance, still subject to your site’s verified AMSL
• At any distance within the 20 km radius — the formula stays the same: permitted building height = CCZM Permissible Top Elevation (in metres AMSL) − your site’s verified ground elevation (AMSL)

Because KIAL alone sits at 915 m AMSL, small errors in a submitted elevation figure translate directly into large errors in the calculated permitted height. A surveyor’s mistake of even a few metres can be the difference between an approved application and a rejected one.

Which Corridors Are Most Affected

Two funnel zones currently shape development across Bengaluru’s fastest-growing corridors. The KIA funnel zone runs through Devanahalli, Yelahanka, Hebbal, and the outer North Bengaluru growth belt — this is the corridor drawing the most new residential and commercial construction in the city right now. The Yelahanka Air Force Station buffer overlaps part of this same area but operates under a separate, independent restriction.

Buyers and developers in Devanahalli, Hebbal, Yelahanka, and outer Thanisandra need to check which authority’s rules apply to their specific plot before finalising a layout, since the requirements and enforcement paths differ.

How an Airport NOC Survey Works in Bengaluru

1. Aerodrome and jurisdiction check — Confirm which of Bengaluru’s four aerodromes’ zones your plot falls in, and whether it also sits inside Yelahanka’s defence buffer.
2. Site elevation and coordinate survey — A site elevation survey captures WGS-84 coordinates and AMSL elevation to AAI’s accuracy requirements, verified against the applicable CCZM grid cell.
3. PTE comparison — We check your verified elevation against the Permissible Top Elevation for that specific grid cell, using the CCZM downloaded from AAI’s NOCAS portal.
4. Documentation — Certificates, ownership proof, and structure drawings get compiled per AAI’s NOCAS documentation requirements.
5. NOCAS filing or auto-settlement — If your structure’s top elevation stays under the PTE, the case can be auto-settled. If it exceeds the threshold, we file a formal NOCAS application.

How Long Does an Airport NOC Take in Bengaluru?

Field survey work for a single plot typically takes a few days. This holds true whether your site sits near KIAL, HAL Airport, or in the Yelahanka corridor.

Certified documentation is usually ready within two to three weeks. AAI’s own review time through NOCAS depends on case load and on how close your site sits to a funnel zone or an overlapping defence buffer.

Sites near Yelahanka often take longer, since they may need sign-off from both AAI and the defence authority. For this reason, it’s worth confirming jurisdiction early and building buffer time into your project schedule, rather than assuming a single, fast approval.

Which Projects in Bengaluru Need This

This requirement extends well beyond high-rise apartments. It applies to:

• Building height clearance for residential towers, IT parks, and commercial complexes anywhere within 20 km of any of the four aerodromes
• Industrial and warehousing structures in the outer growth corridors around Devanahalli and Hebbal
• Solar and wind or hybrid renewable installations being developed in the peripheral zones near KIAL

Why Get Your Bengaluru Airport NOC Survey Done by Surveying India

Our in-house DGPS and Total Station teams deliver WGS-84 coordinates and AMSL elevation certified to AAI’s accuracy standards across Devanahalli, Koramangala, Yelahanka, and the wider Bengaluru growth corridors. We stay directly familiar with all four of Bengaluru’s regulated aerodromes, so we identify which zone or zones actually apply to your plot instead of assuming a single citywide rule.

We treat elevation accuracy as the single most important number in your application, not a formality — the Raheja Vivarea case is exactly the kind of outcome a verified survey is meant to prevent. Because we prepare documentation to AAI’s exact NOCAS format, we reduce the remarks and resubmissions that stall projects in a market with this much overlapping jurisdiction.

Beyond Bengaluru, we’ve delivered survey work for government bodies, PSUs, and private developers across airport-regulated zones in India for over a decade. Our teams also work in Mumbai, Delhi NCR, Jaipur, Lucknow, Chandigarh, Ahmedabad, Kota, and Bhopal.

Planning a project anywhere in Bengaluru? Share your plot location, and we’ll confirm which aerodrome’s CCZM applies, your verified permitted height, and whether Yelahanka’s defence buffer is a factor before you commit to a layout.

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Frequently Asked Questions

How many airports does Bengaluru’s CCZM cover? Four. Kempegowda International Airport at Devanahalli, HAL Airport in Koramangala, Jakkur Government Flying Training School, and Yelahanka Defence Aerodrome each have their own regulated zone, and parts of North Bengaluru fall within more than one.

What is the height limit within 5 km of a Bengaluru aerodrome? Construction within 5 km of any aerodrome’s Aerodrome Reference Point is capped at 45 metres above ground level, roughly 14 floors, regardless of the site’s AMSL elevation.

What happened in the Raheja Vivarea case in Koramangala? The builder submitted an incorrect AMSL figure of 870 metres for the site. Karnataka High Court ordered the developer to remove seven floors from the completed complex at their own cost, showing how a wrong elevation figure can lead to demolition even after construction is finished.

How is permitted building height calculated in Bengaluru? Using the formula: permitted height = CCZM Permissible Top Elevation (AMSL) − your site’s verified ground elevation (AMSL). Beyond 5 km from an aerodrome, permitted height increases by roughly 1 metre for every 20 metres of additional distance, under the conical surface rule.

Do I need a separate NOC for sites near Yelahanka? Possibly. Yelahanka Air Force Station imposes independent height and construction restrictions in addition to KIAL’s civil zoning, so sites in this corridor may need both an AAI NOC and a separate defence clearance.

Where can I find the official Permissible Top Elevation for my Bengaluru plot? The current CCZM, including the PTE for each grid cell, is available on AAI’s NOCAS portal, where you can check your plot’s WGS-84 coordinates against the published zoning data.

Regulatory reference: Height clearance rules for Bengaluru’s aerodromes fall under Gazette Notification GSR 751(E), the Height Restrictions for Safeguarding Aircraft Operations Rules, 2015. The Colour Coded Zoning Map is maintained by the Airports Authority of India on the official AAI NOCAS portal. Always verify the current PTE and zone classification for your specific coordinates before finalising a project.