Visit site with a really good builder
Would any be willing to even do this? How much might they charge for such a service?
Depends - if they have a good prior relationship with you they are effectively quoting for future work.
That's the thing. I only know builders in NI, none in London. Well, I worked as a labourer with a builder back when I did a job for Fiddy. But he was not a "really good" builder. Fiddy was far too trusting.
@Bainbridge started
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Would any be willing to even do this? How much might they charge for such a service?