HI Andi C,
I work for in a solicitors and we get clients with problems like this all the time.
DON'T SIGN until such a time as you are fully satisfied that the problem has been rectified. Anyway, if there is a rush on it, at least insist that yoru solicitor gets some sort of undertaking from the builder that the problem will be remedied by the time you get your keys etc.
Good luck!
Anyway, if it's a new house and there is problems structurally with it later, it should be covered by Homebond/Premier Guarantee!
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