London Borough Of Harrow – 3m Maximum rear extension
Harrow Planning have a 3m rule of thumb for the maximum you can extend a single story extension to the rear:
If you have already extended, then you can only extend up to 3m.
Harrow considers this to be ‘generally acceptable’.
In at least one case this 3m rule has been cited to bring enforcement on unauthorized developments. One such project extruded 7.1m beyond the rear!
All extensions should be subordinate features, and the Council particularly looks at the increased size in footprint to determine whether it is a dominant structure. 7.1m extension increases the footprint of the dwelling by approximately 70%.
The main concern is that developments do not become unacceptable on amenity grounds and ‘detrimental to the character and appearance of the Site and the locality.’
Tags: Harrow Planning, home extensions, London Borough of Harrow, property extensions, rear extensions
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