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Thanks Jeds Currently we have 160-170 of clear gap, so I'll pull up all the bits of various building rubbish, to dig it down a little for DPM and concrete. Would need some levelling off for DPM anyway. Mike

Ooh, quick response, thanks John! DPM straight onto the ground? The extension is 3m out from the building, 6m along it, with 3 airbricks on the single new 6m wall. Is that enough? No airbricks in the existing house due to solid concrete floors. Yep, plans show a solid concrete floor...

Err, 6x2 joists 400mm centres, 3m span.

Hey all, I was hoping someone could clear up some confusion on the construction of suspended timber ground floors. Does the ground surface underneath *have* to be concreted? If so, what are the depths required? My builder has put in this floor to our extension, with the correct sized...

Thanks guys, have had building control round now, and have a much simpler plan of action set out. I can dig out and connect to the previously covered kitchen drain. Mike

Hey all, We're almost finished getting an extension built. It extends off the side of the house, over a drain at the rear of the house, that the sink/dishwasher/washing machine waste drained into (I've already moved those), which the builder has covered. The extension is to have a bathroom...