The need for planning permission for commercial air conditioning in the UK depends on several factors, including: Size of the System: Smaller air conditioning systems generally fall within permitted development rights, meaning you don’t need planning permission. However, larger, more complex systems may require permission. Type of Building: Listed buildings or those in conservation areas may have stricter regulations regarding external installations, including air conditioning units. Location of External Units: The placement of external units must adhere to certain guidelines. Units should be at least one meter away from property boundaries and a similar distance from the edge of flat roofs. They cannot be installed on pitched roofs. Noise Levels: The external unit’s noise level should not cause disturbances to neighbour’s.