I dare say you have a contract. Master Builders
Quoted from Master Builders Qld
18.1 Owners entitlement to liquidated damages
If the builder fails to bring the works to a practical completion stage by the date for practical completion stage, the builder must pay or allow to the owner liquidated damages at the rate stated in item 18 of the schedule for a period commencing from the date for practical completion stage and ending on the day the works reach practical completion stage, or the date the owner takes possession, whichever is earlier.
18.2 Liquidated damages may be deducted from final payment
Liquidated damages may only be deducted by the owner from the final progress payment. Any deficiency may be recovered by the owner as a debt due to the owner by the builder.
Now if the builder puts in say $50.00 a day for liquidated damages you maybe able to get $4200 for the 3 months of course you will have to weigh this up with a legal fight, is it worth it in the end.
Maybe if you approach the builder and explain your situation and that you understand his however this has cost you x and try and come to a mutual amount, failing that get legal advise and a costing to chase and then double it and get a time frame and see if it is worth it.
I also agree about 3 weeks in hospital and 3 weeks to recover must have been some serious issue he had. Of course this is cold comfort when its costing you heaps of $$$ I am guessing its holding costs and accommodation
that you are talking about.
Brian