A loft conversion for your house is considered to be permitted development which does not require an application for planning permission

1. THE DEVELOPMENT GUIDE FOR LOFT
CONVERSIONS
www.cityloftslondon.com

2. A loft conversion for your house is
considered to be permitted
development which does not
require an application for planning
permission, that is provided certain
limits and conditions are met. We
have outlined these below:

3. Loft conversions are not
permitted development for
houses on designated land.
1

4. In order to be permitted
development, additional roof space
created must not exceed the
following volume allowances: 50
cubic metres for detached and semi-
detached houses and 40 cubic metres
for terraced houses.
2

5. You need to bear in mind that any
previous roof space additions need to be
included within this volume allowance. So
for example if there was already 20 cubic
meters installed on your roof, you are only
permitted 20 more if you’re in a terraced
house.
3

6. An extension beyond the plane of
existing roof slope of the principal
elevation that fronts a highway is not a
permitted development.
4

7. No part of the extension is to be higher
than the highest part of the existing roof.
5

8. Materials are to be in similar
appearance to the existing house.
6

9. Any side-facing windows must be
obscure glazed and non-opening
unless the parts which can be opened
are more than 1.7m above the floor of
the room in which it’s installed.
7

10. Any verandas, raised platforms or
balconies are not permitted
development.
8

11. Roof extensions – apart from hip to
gable ones – are to be set back as far
as practicable, at least 20cm from the
original eaves. This 20cm distance is
measured along the roof plane.
9

12. WWW.CITYLOFTSLONDON.COM
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