Picture the house first. You walk in past the front porch, drop keys on the kitchen island, and the dining room catches the late light because the builder finally got the floor plan you wanted. New construction at the end of a quarter means the salesperson on site is trying to hit a number on a whiteboard, not just sell you a house. That timing is the whole reason this plan works.
Now the money. New builds are usually priced around $395,000 in much of the US, and the deposit, the upgrades, and the closing costs all hit before you ever make a mortgage payment. The plan below uses a 0% intro APR window on a Discover card to space the deposit and pre-closing costs, so you keep more cash in the bank for the actual move and the surprises that come with it.
The 15-month intro window is a deadline, not free money. If the balance is still on the card after month 15, interest starts accruing at the card's standard APR, so set a payoff date a month or two before the window ends and treat that as the real deadline.