Guwahati Air Funnel Zones: Building Height Restrictions

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Guwahati Air Funnel Zones: Building Height Restrictions map

Overview

Guwahati airport funnel zone restrictions apply across a 56 km radius from Lokpriya Gopinath Bordoloi International Airport's Aerodrome Reference Point, because LGBIA operates under Instrument Flight Rules. The governing instrument is the Colour Coded Zoning Map published by AAI under GSR 751(E), 2015. It assigns a Permissible Top Elevation in metres AMSL to every grid square in the zone. The airport sits at Borjhar at an elevation of approximately 49 m AMSL, with a single runway oriented 02/20 (north-south).

The AMSL Trap: Why Guwahati Airport Height Restrictions Catch Buyers Off Guard

Guwahati's terrain is not flat. Plots on slopes in Jalukbari, Azara, or areas toward the Kamakhya hillside sit at higher ground elevations than the airport itself, which means their AMSL building ceiling is consumed faster than buyers expect. The critical number is not floors: it is the Permissible Top Elevation from the CCZM grid minus your plot's own ground elevation in metres AMSL.

Permitted Building Heights by Funnel Zone Surface (Guwahati)

The table below shows how permitted building height works across the key Obstacle Limitation Surfaces around Guwahati airport's runway 02/20.

Inner Horizontal Surface

Distance from Runway

Within ~4 km of runway ends

Height Rule

Max ~45 m AGL

AAI NOC Required?

Yes, if PTE is exceeded

Approach / Funnel Surface

Distance from Runway

Along runway 02/20 axis, up to ~9 km

Height Rule

2% of distance from runway edge

AAI NOC Required?

Mandatory in all cases

Conical Surface

Distance from Runway

4-15 km from ARP

Height Rule

Gradient slopes upward at 5%

AAI NOC Required?

Depends on CCZM grid colour

Outer Horizontal Surface

Distance from Runway

15-56 km from ARP (IFR airport)

Height Rule

Generally permissive; local bylaws dominate

AAI NOC Required?

Required if proposed height exceeds PTE

Zone Type

Distance from Runway

Height Rule

AAI NOC Required?

Inner Horizontal Surface

Within ~4 km of runway ends

Max ~45 m AGL

Yes, if PTE is exceeded

Approach / Funnel Surface

Along runway 02/20 axis, up to ~9 km

2% of distance from runway edge

Mandatory in all cases

Conical Surface

4-15 km from ARP

Gradient slopes upward at 5%

Depends on CCZM grid colour

Outer Horizontal Surface

15-56 km from ARP (IFR airport)

Generally permissive; local bylaws dominate

Required if proposed height exceeds PTE

Guwahati's AAI NOC office is one of only nine designated regional offices in India, meaning all complex height clearance decisions for Northeast India pass through the Borjhar office. AAI takes a median of 25 days to approve NOC applications and approves only 58% of all processed applications nationwide. If your seller or developer has not obtained an AAI height NOC and your plot falls in a red-grid CCZM area, no municipal building permit from Guwahati Metropolitan Development Authority overrides that gap. Confirm the CCZM grid classification before signing anything.

Borjhar, Azara, Jalukbari: Which Guwahati Corridors the Funnel Zone Affects Most

Guwahati's fastest-growing real estate corridors run along the NH27 and NH17 alignments radiating from the city, and the airport's north-south runway orientation means the funnel zone bites hardest directly north and south of Borjhar. Areas east and west of the runway sit under the conical and horizontal surfaces, where height rules are more permissive but still apply.

The table below maps key Guwahati corridors against their funnel zone constraint profile.

Borjhar / Azara

Airport Distance

0–3 km (immediate vicinity)

Constraint Level

Very High (approach funnel)

Growth Driver

Airport-linked demand; T2 terminal commissioned

Key Risk

Severe height caps; multi-storey development constrained

Jalukbari

Airport Distance

~18 km (east-northeast)

Constraint Level

Low-Moderate

Growth Driver

IIT Guwahati proximity; NH27 access

Key Risk

Elevated terrain may reduce AGL allowance; check individual CCZM grid

Beltola / Six Mile

Airport Distance

~20-22 km (east)

Constraint Level

Low

Growth Driver

GS Road commercial spine; Dispur proximity

Key Risk

Beyond critical funnel; local bylaws dominate

Lokhra / Dharapur

Airport Distance

~15-17 km (east)

Constraint Level

Low-Moderate

Growth Driver

Affordable residential; expanding urban fringe

Key Risk

Verify CCZM grid; spot variation possible

Narengi / Garchuk

Airport Distance

~12-14 km (northeast)

Constraint Level

Moderate

Growth Driver

NH17 / Ring Road alignment; industrial growth

Key Risk

Conical surface applies; height cap depends on site elevation

Corridor / Locality

Airport Distance

Constraint Level

Growth Driver

Key Risk

Borjhar / Azara

0–3 km (immediate vicinity)

Very High (approach funnel)

Airport-linked demand; T2 terminal commissioned

Severe height caps; multi-storey development constrained

Jalukbari

~18 km (east-northeast)

Low-Moderate

IIT Guwahati proximity; NH27 access

Elevated terrain may reduce AGL allowance; check individual CCZM grid

Beltola / Six Mile

~20-22 km (east)

Low

GS Road commercial spine; Dispur proximity

Beyond critical funnel; local bylaws dominate

Lokhra / Dharapur

~15-17 km (east)

Low-Moderate

Affordable residential; expanding urban fringe

Verify CCZM grid; spot variation possible

Narengi / Garchuk

~12-14 km (northeast)

Moderate

NH17 / Ring Road alignment; industrial growth

Conical surface applies; height cap depends on site elevation

Borjhar is the most misunderstood corridor. Brokers marketing plots in Azara and Garal within 2–3 km of the runway ends promote them as airport-facing growth plays without disclosing that the 2% funnel slope formula limits buildings within 1,000 m of the runway edge to just 20 m of height above ground, roughly five to six floors. At 2,000 m from the runway edge, the ceiling rises to 40 m. These are hard limits enforced by GSR 751(E), not municipal discretion.

Frequently Asked Questions

What is the Guwahati airport funnel zone and does it affect my plot?

Yes, it can. The funnel zone runs along runway 02/20's north-south axis and caps height at 2% of distance from the runway edge. Every plot within 56 km of LGBIA's ARP falls under AAI's IFR airport jurisdiction and requires a CCZM height check via NOCAS.

Do I need an AAI NOC to build near Guwahati airport?

Yes, if your proposed building's top elevation in AMSL exceeds the CCZM grid's Permissible Top Elevation. Below that ceiling, Guwahati Metropolitan Development Authority can approve directly. Above it, apply through AAI's NOCAS portal before beginning any construction work.

How is AMSL height calculated for a plot near Guwahati airport?

Subtract your plot's ground elevation in metres AMSL from the CCZM Permitted Top Elevation for your grid square. Guwahati's hilly terrain means ground elevation varies sharply between plots. Get site elevation certified by a licensed surveyor before submitting any NOC application.

What is the maximum building height within 4 km of Guwahati airport?

Within the Inner Horizontal Surface, roughly 4 km from runway 02/20's ends, the cap is approximately 45 m AGL. In the approach funnel directly north or south of the runway, permitted height equals 2% of distance from the runway edge: 1,000 m away allows only 20 m of height.

What happens if a building near Guwahati airport violates height restrictions?

Courts can mandate demolition of non-compliant floors under the Aircraft (Demolition of Obstructions) Rules, 1994. A Karnataka High Court order required removal of 7 floors for an identical violation. No construction should begin near LGBIA before AAI issues a valid height NOC.

Can I buy land near Borjhar or Azara without facing construction restrictions?

No plot within 56 km of Guwahati airport's ARP escapes IFR airport AMSL height rules. Land near Borjhar and Azara faces the strictest funnel zone limits. Buying land is unrestricted; what you build on it is governed by the CCZM Permissible Top Elevation for your specific grid square.

Where can I view the official CCZM map for Guwahati airport?

The AAI CCZM grid for Guwahati is published on the NOCAS portal and was loaded on 20 March 2017. Heights shown are in AMSL. Deduct your certified site elevation from the permitted top elevation to find your actual permitted building height above ground.

Disclaimer

Air funnel zone boundaries and height restrictions shown here are indicative. Users should verify details with the Airports Authority of India (AAI) via the NOCAS portal (nocas.aai.aero) or relevant defence authorities before any construction or development decision.