The airport overlay in the City of Austin is made of a controlled compatible land use area that is broken into the following airport overlay zones: airport overlay zone one (AO-1), airport overlay zone two (AO-2), airport overlay zone three (AO-3).

The following table prescribes the land uses permitted under certain conditions, including noise reduction measures.

In the Airport Overlay Table:

• P = Permitted
• X = Prohibited
• P-25db means the land use and related structures are permitted, but measures to achieve a minimum outdoor-to-indoor noise level reduction of 25 decibels are required for a structure.
• P-30db means the land use and related structures are permitted, but measures to achieve a minimum outdoor-to-indoor noise level reduction of 30 decibels are required for a structure.
• P-sound system means the land use and related structures are permitted, but a special sound reinforcement system is required.
• P-25db certain areas means the land use and related structures are permitted, but measures to achieve a minimum outdoor-to-indoor noise level reduction of 25 decibels are required for a portion of a building that is a public reception area, an office, a noise sensitive area, or an area where the normal noise level is low.
• P-25db residential means the land use and related structures are permitted, but measures to achieve a minimum outdoor-to-indoor noise level reduction of 25 decibels are required for a residential building.

Residential and school uses in airport overlay zone three, AO-3, are permitted only on property that is included in a final plat that was recorded on August 20, 2001, is located in a municipal utility district on December 31, 2001, or located in a neighborhood plan combining district on December 31, 2001.

In addition to land use restrictions, the following airport hazards are described and prohibited: any structure or object of natural growth: exceeds the height limits of Section 25-13-22; interferes with visual, radar, radio, or other systems for tracking, acquiring data relating to, monitoring, or controlling aircraft; interferes with a pilot’s ability to distinguish between airport lights and others lights, results in glare in the eyes of a pilot, or impairs visibility in the vicinity of the airport; creates a wildlife hazard, as defined by the Code of Federal Regulations Title 14, Part 139; or otherwise endangers or interferes with the landing, taking off, or maneuvering of an aircraft.

Please see Chapter 25-13 – Airport Hazard and Compatible Land Use Regulations in the City of Austin Code of Ordinances for more information.

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