If extras arise due to deficiencies in the drawings and the contractor does not bring these to the attention of the client before doing the work who pays?
...perhaps you should consider hiring a quantity surveyor to have a look at the final account for you.
I doubt if the builder would agree to this as effectively its an arbitration process, but its really the only way out of the problem.
QS would compare contract with works completed and invoices issued and highlight discrepancies. That could still leave the problem of the "extras" invoiced but not authorised in advance - pay for the authorised extras, don't pay for unauthorised?
I didn't mean to imply that.... Dont see why OP would have to get builders agreement to engage QS
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