A 23-storey tower in north Bengaluru raises a question almost no buyer asks: who signs off on how tall a building near an airport can be? The answer is the airport authority, through a height clearance process, and it is one of the approvals most likely to change a project after you have seen the render.
Key takeaways
- Buildings near an airport need height clearance from the airport authority.
- Clearance depends on distance from the runway and position under the approach path.
- It is granted as a maximum permitted elevation, not a floor count.
- A project can be redesigned if the clearance comes in lower than planned.
- Ask whether clearance is in hand or applied for before you buy a high floor.
Why this comes up: Embassy Astra — a reported four towers of two basements, ground and 23 floors in north Bengaluru. Our listing page marks what is official and what is reported.
What the clearance actually is
Aircraft approaching and departing a runway follow a defined path that descends and climbs at a shallow gradient. Anything protruding into that path is an obstacle.
To manage this, the airport authority assesses proposed buildings within a defined radius of an aerodrome and issues a no-objection certificate specifying the maximum permitted height.
Two things determine the answer: how far the site is from the runway, and where it sits relative to the approach and take-off paths. A site directly under an approach path is constrained far more than one to the side at the same distance.
The clearance is expressed as a maximum elevation above mean sea level, not as a number of floors. That is an important distinction, because it means site ground level matters — a site on higher ground gets fewer floors from the same permitted elevation.
The process sits alongside the ordinary municipal and planning approvals rather than replacing them. A project needs both.
Why this matters to a buyer specifically
Three practical consequences, and the third is the one that catches people.
Tower height can change. If clearance comes in lower than the design assumed, floors get removed. That changes unit count, unit mix and sometimes which units exist at all.
Your floor might not exist. If you have expressed interest in a high floor on a pre-launch project without clearance in hand, that floor is conditional.
Timelines move. Height clearance is a separate approval with its own process, and a project waiting on it is a project that has not finalised its design.
None of this is unusual or improper. It is simply an approval that sits between the render and the reality, and the render is usually drawn before the approval arrives.
Which is why the question “is height clearance in hand?” belongs in any pre-launch conversation about a tall building near an airport.
How to check the position on a specific project
You do not have to take a verbal answer. There are documents, and asking for them is reasonable.
- Ask whether height clearance has been obtained or is still applied for.
- Ask for the maximum permitted height in the clearance, if it exists.
- Ask what the design assumes, and whether the two match.
- Check the sanctioned plan — a sanctioned plan reflects approvals actually granted.
- Check the RERA filing, which states the number of floors and units per block.
- Ask what happens to your unit if the design changes, and what the agreement says about it.
The fifth point is the strongest check available to you. A RERA filing declaring a specific number of floors per block means the design has passed the approvals needed to declare it.
Conversely, a pre-launch project with no registration has declared nothing, and its tower heights are an intention. Our guide to buying before registration exists covers what else that means.
Why tall buildings appear near airports at all
It is worth understanding that a height-constrained zone is not a no-build zone, or even a low-rise zone necessarily.
The permitted elevation depends heavily on exact position. Sites a few kilometres apart, both within the same radius, can have very different allowances if one sits under an approach path and the other does not.
So a 23-storey tower and a four-storey restriction can coexist in the same general area entirely legitimately. Geometry, not distance alone, decides it.
What this means for a buyer is that you cannot infer a project’s permitted height from its general area, and you should not assume a neighbouring tall building implies yours is allowed.
Equally, do not assume proximity to an airport means a project is constrained. Ask for the specific clearance and let the document answer.
What a height constraint does to the product
Where a site is genuinely constrained, developers respond in predictable ways, and each has consequences for you.
More towers, fewer floors each. This spreads footprint across the site, which reduces open ground. A height-constrained project often has less usable open space than an unconstrained one at the same density.
Larger floor plates. More units per floor to recover the unit count, which means more homes sharing each lift core and each corridor.
Basement expansion. Parking goes down instead of up, which is fine but adds cost that lands in your price.
So a height restriction does not necessarily reduce density; it changes its shape. Our guide to what open space percentage actually counts explains why footprint and height are the two variables that matter.
The practical question to ask is homes per lift core, not floors per tower. That is what you experience at 8:45 on a Monday.
There is one genuine upside to a height-constrained site worth naming. A permitted elevation that everyone must respect means your own view is less likely to be built out later, because the constraint applies to your neighbours too.
In an unconstrained area, a mid-floor view can disappear behind a taller tower a few years on. Under a height cap, the sky above a certain line stays open for everyone.
Common questions
Do apartment towers near airports need special approval?
Yes. Buildings within a defined radius of an aerodrome require height clearance from the airport authority, issued as a no-objection certificate specifying a maximum permitted elevation. It sits alongside ordinary municipal and planning approvals rather than replacing them.
How is airport height clearance decided?
By distance from the runway and position relative to the approach and take-off paths. A site directly under an approach path is constrained far more than one to the side at the same distance, so geometry rather than distance alone decides it.
Can a project lose floors after launch?
It can, if height clearance comes in lower than the design assumed. That changes unit count and mix, and a high floor you expressed interest in pre-launch may not exist. A RERA filing declaring floors per block means approvals supporting it have been granted.
How do I check a project’s permitted height?
Ask whether clearance has been obtained or applied for, ask for the maximum permitted height in it, check the sanctioned plan which reflects approvals actually granted, and check the RERA filing which states floors and units per block.
Does a height restriction make a project less dense?
Not necessarily. Developers respond with more towers on larger footprints, larger floor plates with more homes per lift core, or deeper basements. Density often stays similar while open space reduces, so ask homes per lift core rather than floors per tower.
Buying a high floor pre-launch?
Send us the project and we will check what the sanctioned plan and any RERA filing actually declare for tower heights, so you know whether your floor is approved or aspirational. No charge.
This describes the general shape of airport height clearance in India rather than the position on any specific site; permitted heights are site-specific and only the clearance document for a given project is authoritative. Figures above are drawn from published project information and are indicative. Verify any registration yourself on the Karnataka RERA portal before paying a booking amount.
