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Foundation for garden room/office

Hello All,

I was after some advice please. I have my design in place for a new summer house, which incorporates a small brick wall; maybe 3/4 brick high then timber structure onto of that. but I am unsure on foundations and whether to:

a) Do a whole pad foundation.
b) Do a strip foundation.

And if you were to recommend a pad foundation would you put hardcore, sand, DPM, insulation then concrete? I would like to put underfloor heating in room.

Or do I do a strip foundation, if so, what depth, then excavate the floor and then add insulation, dpm etc?

Any advice would be welcomed.

The size would be 5m x 5m.

Many Thanks,

Richard.

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