DIY and builder's liability insurance.
The owners could sue for upto 3 years from discovering the damage
caused by your work - NOT from when you actually did the work.
Successive owners would aquire this right too.
Your household policy would typically cover non-specialist DIY -
including general extension work. Underpinning may be considered
specialist and beyond the scope of normal DIY, so you could be
uninsured.
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