Flat to pitched roof on extension

chripsyduck87

Hi guys,

My first post on this forum! I'm (touch wood) about to move into a semi-detached house (UK-based) which has a one story side extension which has a flat roof. It's quite a high extension, you have to climb a small set of stairs (5 or 6) to get to it, so like a split level off a landing.

I'm waiting for the surveyor report but there don't seem to be any specific problems with the flat roof but some point soon I'd like to convert it to a pitched roof.

From your experience, would I need planning permission to do that? It's way below the main roof so wouldn't be higher than the existing roof on the second story. Lastly, one of the rooms (a bathroom) in the extension doesn't have any windows, so would I need PP to put one in? It would be overlooking a neighbour's property.

Thanks very much in advance!

Doozergirl

Provided that permitted Development rights haven't been removed, the pitch on the roof should be fine. The rules are here:
https://www.planningportal.co.uk/info/200130/common_projects/17/extensions


The bathroom window would need to be obscured glass if it's in a side elevation. Not a problem in a bathroom.
https://www.planningportal.co.uk/info/200130/common_projects/14/doors_and_windows

Furts

Rule of thumb is anything visual, and in particular if visible from the front of the house, needs to be considered for PP. For finer points you need to contact the local authority or planning portal. Your roof and window would fall under this.

Next stage is you will need a design for the pitched roof, and there will be calculations/timber sizes. Likewise the window opening for a lintel. This design will need to go forward for Buildings Regulations. If you are confident then you could omit the design stage for the roof by going to a trussed rater manufacturer, but you will still need the Regulations.

I am uncertain about your stair detail. You might find this does not comply with the Regulations. Without seeing nobody can say, but this would be part of your design anyway so you have covered all bases.