my wife and I are designing a rear single story extension. Does anyone have the dimensions for a BISF house we can use for the design.

Also bit cheeky but might as well ask, if anyone actually has the design layout I can use to apply the new extension to and an idea of the best software to use for it?

Kind Regards


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Hi Peter
Sounds like an exciting project and we look forward to hearing how you get on with it. It would be great if you could keep a photo diary perhaps and share it with us for the benefit of all our users, especially those considering a similar project.

We do have original copies of floor and building plans in our archives but the drawings are so large that as yet we haven’t been able to find a copier large enough in order to have them copied and scaled down for viewing.

We do have several other plans of lower quality that I hope will be of use to you. The quality is not the best because they were taken from a photograph, although I do have an architect working on a new drawing for this plan as we speak.

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