1930's foundation depth

[NorthWest1]

Hi,
I'm planning on replacing my lead water mains for MDPE. My water authority says I have to dig down to a min of 750mm, this sounds quite deep to me and I'm trying to get some idea of what I'll find at that depth considering my house is solid brick, 1930's....is this likely to take me under the bricks or should I have a core bit ready to go through the wall ( I imagine removing bricks in a small trench will be impractical ) ? I was under the impression that houses of this era only had very shallow foundations and I'm trying

 

[blup]

Mine were 20” but you wont have a dpm so the pipe will come straight up through whatever’s there.

 

[NorthWest1]

It'll be a lot easier if I don't have to go through bricks, 20''would be fine.. Coming up I have to go through concrete, my DPM is bitumen under parquet, possibly containing asbestos, I'm not looking forward to drilling through it.

 

[mikeey84]

I'd be surprised if you had foundations 750mm down, but ground levels may have changed, and builders back then did what they thought was best, so there is a lot of variation!

I've seen 8 courses underground a 1920s terrace, and further down the street 3 courses then earth!

 

[^woody^]

The foundation depth with depend on the local ground. The same type of house in a different location may have a different foundation depth.