Building Control Regulations
This is mainly to do with the health and safety of the build. Your loft conversion specialist would normally sort all of this out for you so you would not have to worry about this. This will just cover:
- If there is sufficient structural strength in the new floor
- Structural stability is not endangered (included the existing roof)
- There is a safe fire escape route
- The stairs leading to the new loft space are safe
- Sufficient sound insulation between loft space and the floors below.
This is slightly more complicated. Since 2008 the permitted development rights were extended meaning that loft conversions rarely needed planning permission. However, there are several conservation areas in London which means that you might need planning permission. You can get a good indicator of whether you would be able to get planning permission by having a look down the street to see if anyone else has had the same work done.
Other times that you will need planning permission is:
- The extension on a terraced house exceeds 40 cubic metres
- The extension on a detached house exceeds 50 cubic metres
- If the extension goes beyond the current roof slope on the side that faces the highway
- If the extension is planning to go higher than the highest part of the current roof
- If you are planning to use materials that are different in appearance to the current structure
- If you are going to include a balcony, veranda or raised platform
- You live in a conservation area of London
Local London builders will know if you live in a conservation area and also how likely your plans will be approved and even if they are needed.