That is a common tactic that builders do CP, but it is very frustrating for you I am sure. It is so exciting to buy your first home and when this happens it does take some of the excitment and turn it into frustration.

They secure the sale of X number of houses and work on them until they are all ready for completion at or about the same time. This means the closing dates of the people who purchase first are moved to later dates, with a block of houses closing in a very short time span.

You should have gone to a lawyer before hand and had it written into your offer that you would be guaranteed(unless by an act of God) a closing date or the builder must pay a penalty to the purchaser. I bet your builder is running out of building supplies because he is using them on other homes.

Also new home buyers should make sure they get the builder to put their down payment into an interest bearing account ,whereas any accrued interest be payable towards the purchase of the said home.