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The valuer sent on behalf of the mortgage lender should be able to tell.
Exactly this.
I wonder whether this is exactly what happened with the previous buyer who couldn’t get a mortgage. And possibly why they’ve lopped a big chunk off the price, because the surveyor said it’s worth less because of the build type.
Mortgages can be got on non-trad construction houses, so long as they’re not on a list of defective types, but not all lenders like them so you need a broker who knows what’s what.
It’s probably more likely to be trad cavity built and the EPC is wrong but there are a few warning signs so I’d check before committing.
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