two story side extension - roof pitch wrong way round

bluewater

I'm looking at the possibility of a two story side extension to a detached house which has the gable end of the pitched roof facing the front. So the two story extension (single garage with utility room at back with bedroom and en-suite above) would have a similar but smaller pitched roof with a gully between the two. Overall dimensions about 3.2m wide by 7.6m (7.6m is the depth of the house).

Every two story side extension that I can find is on a house with the pitch front to back (gable ends on each side), so is it much more difficult for a house with the roof the wrong way round? Would it be more costly or would planning permission be more difficult.

Thanks

MX5huggy

The valley between the 2 roofs is a weak point, and will add some cost, it should be well built and lined with lead. Planning wise I can't see why it would make a huge difference.

Done a quick model of the alternative

bluewater

Thanks very much for your reply. Great model - how did you do that?

sunshinetours

I always think that it looks neater when there is a perpendicular roof ie at 90 degrees like the right hand model above.
Can't see why the run of your roof would make any difference to waht you can do though

MX5huggy

bluewater wrote: »

Thanks very much for your reply. Great model - how did you do that?

Google Sketch Up its free and easy, loads of online tutorials.

bluewater

Thanks again. Agree that the perpendicular example on right can look better - although not necessarily from the front which is most on view in this case.

Interesting that you have drawn the other extension as set back from the house. I read on this website http://www.uk-builder.com/planning%20permission/house-extension.htm that: Most councils design guides will not let you build right up to the boundary at the first floor level. This is to prevent 'terracing' of the street scene. This usually means 'insetting' the house extension by at least 1M. The ground floor element can normally go closer. Secondly, is respecting the shape of the existing dwelling. This often means setting back the extension to obtain broken wall & roof lines together with a lower ridge line. Simply adding on a 'block' of same depth extension with flush front elevation wall & roof lines will normally be resisted.

There is only 3.2m between the house and the boundary so if the extension cant go to the boundary it wont be wide enough. As for setting it back - I'm not keen on that either. The house is tile clad and I think it would be better if the extension were flush with the tiles hiding the join.

I dropped in to speak to the duty planning officer but didn't get much from him because they have just introduced a Pre Application scheme which costs £50 and advises whether the council are likely to grant you planning permission for your proposals.