The build

Big IF, I know, and I don't expect you to know the answer, but, instead of digging down further (if you have too) could you raise the platform up by 75cms?

Generally not an option as your planning application will have an elevation drawing showing lie of the land and the house located in it. I’ve seen roofs removed that have exceeded height. Grumpy neighbours and general busybodies love nothing more than to find an error in your construction to beat you with.

Very true on all counts. We don’t want to upset (most) people in the village. Especially as a lot of them are the reason we’re able to build at all. Selling us the land in the first place very very cheaply. We also realise it’s a big change in the village as it’s the first house to be built for over 65 years! There have been complete renovations (3 I think ) and extensions but no new builds.