- Offers more living space.
- Can add in the region of 15% to the value of a typical semi-detached property.
- Create windows that give you access to a different view.
...and it may not even require planning permission!
Do I Need Planning Permission?
Planning Permission may not be required subject to the following limits and conditions:-
- A volume allowance of 40 cubic metres for terraced houses.
- A volume allowance of 50 cubic metres for detached and semi-detached houses.
- If your property fronts a highway, you cannot extend beyond the roof plane which fronts the highway.
- No extension to be higher than the highest part of the roof.
- Materials to be similar in appearance to the existing house.
- No verandas, balconies or raised platforms.
- Side-facing windows to be obscure-glazed; any opening to be 1.7m above the floor.
- Roof extensions not to be permitted development in designated areas*.
- Roof extensions, apart from hip to gable ones, to be set back, as far as practicable, at least 20cm from the eaves.
* Designated areas include national parks and the Broads, Areas of Outstanding Natural Beauty, conservation areas and World Heritage Sites.