Finished floor level same as ground level

[pattieG]

Hello.

I am designing my extension and I have come up against a problem. It appears my FFL is the same as ground level outside. Incidentally I've also noticed that on the plans for other houses built at the same time on my road that they show the FFL as 150mm above ground level. I know this is a requirement for current building regulations but I don't see how this will work unless I put a step from the existing house into the extension.

Is there a workaround for this or are my measurements wrong?

[pattieG]

Would the 1200g membrane for the concrete floor be placed up the inside wall leaf and then lapped over the DPC in the wall?

Edited by pattieG on Wednesday 7th February 13:15

[pattieG]

Magenta line is the Membrane going up the wall and lapped with the DPC three courses above ground level.

Or if BCO don't like that then a type A waterproofing barrier.

Edited by pattieG on Wednesday 7th February 13:54