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Yeah this is my view also - I've a lot of respect for SPAB. Always useful and good to hear this from someone else - when purchasing the rose tinted spectacle effect can be all too real.
What I don't have any experience of is whether it affects the mortgage lending. We shall see.
Edit: I'd read this previously but forgotten about this specific document - good to see I recalled the right actions to take :)
In the SPAB’s experience, mortgage lenders
can demand unnecessary damp-proofing work
during house purchases. Although mortgage
valuers have a duty to follow a trail of suspicion,
some simply pass all responsibility onto remedial
treatment contractors with a vested commercial
interest encouraging over-specification. It is
worth challenging any diagnosis you believe is
questionable and, if necessary, seeking a second
opinion in writing from an independent chartered
building surveyor or consultant (note, not
contractor). -
Most damp issues are related to thinks like gutter/pipe/tile/flashing leaks/inadequate ventilation that simply need fixing, or modern materials (cement instead of lime) being applied
This needs to be printed onto a length of 2x4.
[Edit] One other cause is DPCs being breached by new building work / building waste.
If you're buying a house >100 years old letalone 240 years (!) I'd recommend doing some reading on SPAB/Historic England/Cadw or whatever the equivalent is where you are, or buying the "old house handbook" or similar books
Most damp issues are related to thinks like gutter/pipe/tile/flashing leaks/inadequate ventilation that simply need fixing, or modern materials (cement instead of lime) being applied