Posted by on 04/02/2017

Loft Conversion Planning Permission

In 2008 the government changed the planning laws for loft conversions in England and Wales. The changes consequently made it easier for more properties to be converted without the need for loft conversion planning permission. Due to the changes the majority of loft conversions carried out today are done so under permitted development rights. Loft conversion planning permission is required when you extend beyond the roof profile. Or if your conversion will exceed set limits and conditions. 

In order for your loft conversion not requiring an application for planning permission with the local council, the following conditions should not be exceeded.

• For terraced houses, a maximum allowance of 40 cubic metres of additional roof space.

• For semi-detached or detached houses a maximum allowance of 50 cubic metres of additional roof space.

• You are not allowed to extend the plane of the existing roof slope, this is from the main elevation that front the road.  

• No part of the loft conversion and exceed the highest part of the roof.

• Material must be similar and be in appearance to the ones on the existing house

• Verandas, balconies and raised platform are not allowed.  

• Roof extensions, apart from hip to gable ones, to be set back, as far as practicable, at least 20cm from the original eaves.

• The roof enlargement cannot overhang the outer face of the wall of the original house.

Loft Conversion Design Service 


Loft Projects offers a full loft conversion design service enabling us to give you a wide range of designs and choices for your loft conversion. Find out more about our design service

 Loft Conversion Costs

small bathroom in loft conversion

Are you interested to find out more about loft conversion costs for your London home? We have put together a short guide that shows you the average costs you can see more here.

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