Shale infill

[needsleeptoday]

We are in the process of buying a house and paid to have a shale infill test as it in a known problem area.

We paid as the seller didn't want to.

It has come back with a problem and now we don't know what to do

Does anyone have any experience with this?

We are going to ask them to fix it but I'm unsure if they will as it's expensive

Aibu asking them to fix it? That's really the only option as far as we can see (a quick talk with a builder priced it up at 30k plus a new kitchen and downstairs toilet)

Do we have to share the report even though we paid for it?

30k?! Walk away?

Yep!
It involves digging up the floor (in the whole of downstairs) and replacing it hence the new kitchen too as the one there has to come out!
It's a large house and he said it's around £240 per square meter plus vat

You may find the house is unmortgageable until this is fixed in which case the sellers are going to have to deal with it before you buy in any case.

We have had our mortgage offer already, the mortgage company didn't even want to do the test even when we specifically asked

Find a different house? Or tell their estate agent what the report showed they will have to disclose it to any future buyer, then day you are willing to buy for 40k less to cover the costs and the inconvenience of major works.

Tell the sellers either they pay for the works, or knock the cost off of the selling price. If they refuse to do either, walk away from the sale.

Walk away, seriously.
And congratulate yourselves on paying for the test. What an escape.