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I'm no expert, and have picked this up over the past few weeks.
Having spoken to the surveyor this morning, I believe the owner rather than the builder. And the neighbours (mine in my case) property has to be left as it was, having used the same materials as were there before (e.g. a London stock brick wall has to be extended using London stock bricks - not a cheaper alternative).
I imagine a builders quote will (or at least should) include the fact that they will complete the work in accordance with the Party Wall Act. In practice, and from experience here, I imagine that some builders will try to cut as many corners as possible here, whilst simultaneously painting you as an unreasonably picky, demanding git to your neighbours.
You can ask a survey be done of your property at the project owners request, and that surveyor becomes the adjudicator in any disputes.
christianSpaceman-
diving in a bit late here, but it isn't as simple as the developer paying costs. if it is a prty wall, and the works to the wall benefit both f you, you may need to split costs. this is where most of the disagreements come from. third surveyors get involved, etc...
just to note - it is a party wall issue and they have not obeyed the act, this will be frowned upon, should any dispute arise
BRM
Who is expected to pay/make good in Party Wall situations? The builder or the property owner having the work carried out? If major cost was involved would there be a case for claiming on the builder's insurance?