Loft conversions Adding a loft conversion to your home


Loft conversions are very popular.

They are the least disruptive of all bigger improvements to your home, you won’t need to move out as the majority of the work can be done from the exterior.

 ” Is my loft convertible? “

Good question! You will need to check the height of your loft ceiling. In our experience you should ask your structural engineer or architect to calculate how much head height you will have when the loft is converted. You need these calculations to give you a realistic expectation of what can be achieved.

To help you we have prepared our Ultimate Guide To Loft Conversions with all the information you’ll need. 

Of course, we are just a phone call away to answer any queries you may have.

Loft conversions under Permitted Development

You can convert your loft under permitted development within these limitations:

  • Any additional roof space cannot exceed 40 cubic metres for terraced houses or 50 cubic metres for detached and semi-detached houses. 
  •  An extension beyond the plane of the existing roof slope of the principal elevation that fronts a highway is NOT granted under permitted development.
  •  Materials should be similar in appearance to the existing house.
  • No part of the extension to be higher than the highest part of the existing roof.
  •  Verandas, balconies or raised platforms are NOT granted under permitted development.
  •  Any side-facing windows must be obscure glazed and non-opening unless the parts which can be opened are more than 1.7 metres above the floor of the room in which it is installed, for example a velux window in the roof. 
  • Roof extensions  should be set back as far as is practicable, at least 20cm from the original eaves. The 20cm distance is measured along the roof plane. The roof enlargement cannot overhang the outer face of the wall of the original house. 
  • You need to consider protected species when planning your loft conversion. A bat survey may be needed, and if bats are using the building, a licence may be required.

Loft conversions under permitted development are not possible in designated areas such as National Parks, Areas Of Outstanding National Beauty, Conservation Areas, World Heritage Sites and the Broads. If you are planning to do a loft conversion and your house is on designated land, you will have to apply for planning permission.

Planning permission is also required if you live in: 

  • Flats
  • Maisonettes
  • Converted houses
  • Houses created through the permitted development right to change use
  • Other non-dwelling buildings

Even if you are converting your loft under permitted development, we strongly recommend you apply for a lawful development certificate.