DPM higher than DPC - possible?

21 Oct 2014
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West Midlands
United Kingdom
The current DPC on my house sits a brick below FFL. When extending should I continue the DPC at the same level?The ground level outside is flat and 220mm below DPC.

If so, when I pour my floor slab and lap the DPM into the internal leaf, that will be a brick higher than the DPC....

What's the right way to do this?
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Keep the DPCs level with the new floor level. Step the external DPC down where it joins the the house and lap it with the existing
I asked (or tried to) very similar a couple of weeks ago. I've since moved on a bit and the extension dpc level will be a bit higher than the existing house one, and they will be linked via a (small) vertical dpc after advice on here and the bco has also said that's fine.
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Sorry I didn't see the reply, I guess I gave a "worse" version of Woody's answer lol

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