Thanks to ummm for pointing me here.
I can't say I've ever heard of rabbit damage to building foundations, even though they can burrow to between 3 and 4 metres down, well below average foundation depth.
Cloverjo makes a good point - badgers are much more of a problem. Their tunnelling is much bigger. There are several cases of imminent foundation damage by encroaching burrowing.
Damage seems to be confined to garden vegetation, but there are chemical solutions available, or more natural, rabbit-friendly methods if you'd rather.
You could ask the opinion of a surveyor, but I doubt if they would have much experience of this either.