While every presale contract is different, typically you have to pay a fixed amount upon signing the purchase agreement. You have 7 days to reconsider if you want to proceed with the purchase. Once you decide to go ahead with the purchase, you will need to put down 5-10% of the purchase price as a deposit, with subsequent payments of 5% of the purchase price over the next 12 to 18 months. The deposit usually adds up to 15-25% of the purchase price. This is considered the down payment of your new home. When your home is built, then you will start paying for the remaining 75-85% of the purchase price.