Can anyone tell me roughly how much underpinning can cost please? It is a bog-standard brick 1930's house, 3-bed detached. The previous owners told me that it had been 'monitored' but nothing was found. A couple of the walls are a little out of true, but not massively so. Plus there are no significant signs of cracking (though it looks to have been pointed in the last 10 years). The area has other houses with significantly more obvious signs of subsidence (clay soil).

The valuation report said that there appeared to be signs of historical movement, but nothing on-going, which would be consistent with the off-level floors (very slight, but just noticeable).

I'm getting the property cheap, so can allow for any future cost of under-pinning if not too prohibitive. Alternatively, I could give up and walk away from the deal. TIA.