Guides & Advice

New permitted development rights | Additional storeys can be built on top of existing blocks of flats

New permitted development rights | Additional storeys can be built on top of existing blocks of flats

From 1 August 2020, a new permitted development right is being introduced, allowing an additional one or two storeys to be constructed on top of existing blocks of flats.

This is alongside engineering operations, replacement or installation of additional plant, construction of safe access and egress and construction of ancillary facilities, where necessary.    

The ‘upward extension’ measure is being introduced with the aim of increasing housing delivery across the country in a bid to protect ‘greenfield’ land.  

What are permitted development rights? 

Permitted development rights allow you to make certain changes to a building without needing to apply for planning permission.  

Are there any restrictions? 

The permitted development right is limited in the buildings in which it can be applied to. The right will only apply to blocks of flats that: 

  • are detached; 
  • are at least 3 storeys in heightand 
  • were constructed between 1 July 1948 and 5 March 2018. 

It is important to note that the right does not apply to listed buildings, scheduled monuments or buildings within the curtilage of such. Nor does it apply to buildings within Conservation Areas, National Parks and the Broads, areas of outstanding natural beauty, or sites of special scientific interest.  

If buildings do fulfil all of the criteria above, then an ‘upward extension’ can be built under permitted development. There are, however, still restrictions on what can be built out.  

A full copy of the legislation can be found here. 

To summarise, the restrictions are as follows: 

  • The extension has to be constructed on the principal part of the building; 
  • The extension cannot exceed 30 metres in height;
  • The overall roof height of the extension cannot be more than seven metres higher than the highest part of the existing roof; and 
  • The internal ceiling height of each storey cannot exceed three metres, OR more than the floor to ceiling height of any of the existing storeys (whichever is the lesser height). 

Prior approval 

 An application for prior approval will have to be made to the Council, accompanied by comprehensive floor plans and elevations. Submitting these details will satisfy the council that the design of the proposals is acceptable, in addition to adequate light being achievable. The council will then have eight weeks to determine the prior approval application. 

Contact us

For advice and support on the new ‘upward extension’ permitted development rights, or any other planning query, contactBrian Mullin orLizzie Beresfordin our planning consultancy team,Marrons Planning. 

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