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Thanks for your replies all. The 150mm I quoted was what our surveyor told us was building regulations. Woody, my next port of call was to ask what to paint the wall with. I was advised to paint 150 mm from the DPC upwards with bituminous paint. I’m wondering is that recommended or could I use...

Hi Woody. The height may look ok, but the DPC is only a few mm above the ACO drain in the pictures. Building regulations state that the ground level and drainage should be a minimum of 150mm below the DPC.

Hi. The ground level came up to the bottom of the subfloor vent and there was decking on top of that, level with patio door sill. It had been there for about 15 years or more, I think.

Hi Woody. Please see attached. You can just make out the thin line with appears to be the lower DPC, with the ACO type drain just below it. I've attached another one so you can see the old air brick. Thanks.

Many thanks for your reply Justin. As far as I know, the lower DPC is to protect the wall and the higher one is to protect the floorboards. There's a 'floating floor' downstairs in the house.

Hello everyone. I just had a patio installed. The pavers agrgued with me at the outset when I told them that it must be a minimum of 150mm below the DPC. They said 75mm was sufficient, but I insisted on 150mm. Eventually they conceded and went ahead with the work. However, I did not know that...