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300mm depth as in the depth of the trench. Then maybe 50mm hardcore and 250mm of concrete as per the above mix. So I'd bring it to ground level and then put a layer of bricks with the DPC material above.

Thanks for responding. I think this would be classed as trench fill foundations and I was advised to just fill it with mixtures of ballast, cement and building sand. Then do my a couple layers of bricks with DPC. Would this not be the best way then?

Hi all, I hope you are well. I'll try to keep this short. I am building an outbuilding (hopefully to use as an office / gym). The size is approx. 7m by 4m. It is being built on the boundary so within 1m. I plan to build it all of the light breeze blocks (except two rows of bricks at the...