Raising the roof.

Adding new dwellings on the roof of a block of flats.

Class A was introduced in an update to permitted development in 2020 and took effect from 1st August 2020. It allows for the construction of up to two additional floors on a purpose built detached block of flats. This is best described as the upwards extension of two storeys of residential flats on a current block within the airspace.

The flats must have been constructed between 1st July 1948 and 5th March 2018. This is not available  on conversions created under the GPDO Part 3 in Class M. In other words not a conversion unless full planning has been obtained and the works were completed before March 2018.

Importantly the new dwellings must be C3 flats only. They cannot be converted to HMOs

The current block must be detached and so not connected to one or more other buildings, even if these are flats.  The current building must be at least three storeys high and by adding the new storeys you do not exceed 30 metres in height. Although plant and machinery may be higher than this.

You cannot use this scheme for listed buildings or those within a conservation area. 

If you have a suitable site then there will need to be a prior approval application with the Council. They will  consider factors including transport & highways, air traffic and defence assets, contamination, flood risk, external appearance, natural light in all habitable rooms, impact upon amenity space of the existing building and neighbouring ones as part of the application determination

January 2024

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