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If it is straightforward and not a million dollars then no problem.
I kinda disagree with this. It would not have been hidden if it had no bearing on the property, spendy building insurance or not.
The least you need to do - along with insurance cost impact - is find out what was done, when and why.
Howard-
@spenceey will need to know what was done when and why to get the insurance quotes.
I'm of the opinion that properties have histories. The paperwork is often incomplete. There will be things in the past that aren't ideal. As long as it doesn't have a material impact on you when you are living in it then it doesn't matter.
Underpinning is a bit of a mixed bag. In some streets it is good as it means that property has been fixed (assuming it was done right) which is better than the one next door that will need to be done one day. The when can be important too. If it was 30 years ago it is ancient history IMHO, last year not so much.
It's been almost a decade since I bought or sold but I thought underpinned or not was in the property information pack so it seems odd to have come up so late.
jellybaby
Get some building insurance quotes. If it is straightforward and not a million dollars then no problem. If you find you have to spend hours talking to specialist insurers and the premiums are high you might want to renegotiate or walk.
You of course need buildings insurance from exchange day so you need to do this bit anyway.