Two storey rear extensions



For information about the guidance on this page and how it should be applied, visit Using this SPD.

Where proposals deviate from the guidance here, the Council will need to be satisfied that proposals are high quality and not detrimental to neighbourhood amenity. Pre-application submission is encouraged.



Timber-clad two storey rear extension in Southwark, by Proctor & Shaw Architects


7.5 Two storey rear extensions

7.5.1

Proposals for double storey rear extensions must:

  • at first floor level, extend no more than 2m from the original rear wall for terraced properties and semi-detached properties, and no more than 3m for detached properties.
  • not extend beyond the 45-degree line(s) as measured in plan from the middle of the nearest habitable room window(s) on the original rear wall of any neighbouring properties.
  • have eaves at the same level as, or below, the eaves of the original home.




7.5.2

Where homes have already been extended, consideration will be given to the cumulative impact on character and neighbouring amenity. This will not affect permitted development rights.


7.5.3

Biodiverse/green roofs should be considered for any newly introduced flat roof. Read more about green roofs here.


Two storey extension, maximum depth of 2m at first floor level

Two storey rear extension in Walthamstow, by Neil Dusheiko Architects

This extension deviates from the guidance here, as the first floor extends out from the existing house by more than 2 metres. However, this is justified due to the proposal’s exemplar design quality and enhanced building performance. Read more about exemplar design here.

Retrofit considerations for this type of alteration - this can be viewed closer-up in the right-hand side bar



Learn about the retrofit ideas above, and other retrofit measures, using the links below:




For information about the guidance on this page and how it should be applied, visit Using this SPD.

Where proposals deviate from the guidance here, the Council will need to be satisfied that proposals are high quality and not detrimental to neighbourhood amenity. Pre-application submission is encouraged.



Timber-clad two storey rear extension in Southwark, by Proctor & Shaw Architects


7.5 Two storey rear extensions

7.5.1

Proposals for double storey rear extensions must:

  • at first floor level, extend no more than 2m from the original rear wall for terraced properties and semi-detached properties, and no more than 3m for detached properties.
  • not extend beyond the 45-degree line(s) as measured in plan from the middle of the nearest habitable room window(s) on the original rear wall of any neighbouring properties.
  • have eaves at the same level as, or below, the eaves of the original home.




7.5.2

Where homes have already been extended, consideration will be given to the cumulative impact on character and neighbouring amenity. This will not affect permitted development rights.


7.5.3

Biodiverse/green roofs should be considered for any newly introduced flat roof. Read more about green roofs here.


Two storey extension, maximum depth of 2m at first floor level

Two storey rear extension in Walthamstow, by Neil Dusheiko Architects

This extension deviates from the guidance here, as the first floor extends out from the existing house by more than 2 metres. However, this is justified due to the proposal’s exemplar design quality and enhanced building performance. Read more about exemplar design here.

Retrofit considerations for this type of alteration - this can be viewed closer-up in the right-hand side bar



Learn about the retrofit ideas above, and other retrofit measures, using the links below: