Evening,purchasing a property in the mid- lands .. Appreciate legal, engineer, and other advice! I have paid deposit and signed contracts (not returned) on a property. I have been asking questions with reference to a large extension at the rear since the first day we went to view.. Auctioneer assured me that planning was not necessary as it fell below the threshold of 40sqmt. There is also an pantry and utility room on the back which ( this is the first problem!) she assured me were part of the original build. I suspected not! Today as we are about to exchange contracts the vendors solicitors advised that ..... You guessed it... Planning was required. So now vendor/purchaser have to apply for retention planning. Vendor wants us to complete sale but with hold €5k until grant is issued. We do have good chances of getting retention according to our engineer.... But there is a chance that we wouldn't... What do we do?... What are our options re compensation for inconvenience, change of not getting planning, reducing pp to reflect issues .. I, sure there are more I'm bit thin king of. Advice appreciated..