It's all about comprehension! Builders and Consumers.
Building contracts are trying to be more weighted in favour of 'everyone understanding' not weighing towards builder or consumer. You would be suprised how many builders don't understand all of the clauses and the circumstances in which they...
What type of contract did you sign. One supplied by one of the building industry associations (MBA or HIA etc)? Within the clauses of an industry written contract will be a clause worded similar to this " Agreed damages for late completion of the Building works" if nothing is stated in the space...