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Not sure if you have had party wall stuff done before, but there are basically 4 options.
- WHATEVER! WE COOL! (not wise for anyone IMO)
- I'm not worried, but lets be sensible... (you hire a surveyor)
- I'm not into this, I want a professional to look at this thoroughly (full surveyor inspection)
- Fuck you and fuck your surveyor, I don't think you should be allowed to do this and I will try to stop you. (2x 3).
FWIW I tried to use her surveyor as she instructed them before we had even instructed our own but they refused. All a bit fishy IMO.
- WHATEVER! WE COOL! (not wise for anyone IMO)
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I'm aware of the options. 4 is not really a thing, though, is it? You cannot prevent someone from doing work on their own property. All the adjacent owner can do is dissent, and employ their own surveyor.
Either way " I tried to use her surveyor as she instructed them before we had even instructed our own but they refused." - Amir-Siddique v Kowaliw suggets that they could be liable for some of your ow surveyor's fees (IANAL though, so pinch of salt).
Why didn't you just use their surveyor?