A builder's below-market rate almost always comes out of their profit margin, and the sticker price stays intact on purpose. Production builders carry a healthy margin on each home (often in the low-to-mid 20s percent range, though it moves with the cycle), and most large national builders own or partner with an affiliated mortgage company. That combination lets them spend a few points of that margin buying your rate down through their captive lender while the list price never moves. They protect the sticker price for a reason. A price cut angers everyone who already bought in the community and sets a lower comp for the next sale, while a rate buydown moves the home without touching the list price. Builders also carry real costs on finished, unsold inventory, so moving a unit quickly is worth money to them. On a home with, say, $90,000 of built-in margin, giving up several thousand dollars to buy the rate down is a small cost of doing business. A few things to watch: - Builders dial these incentives up or down purely to move inventory, so a rich buydown usually signals slower sales rather than generosity. - The buydown is often done on an FHA loan, which is cheaper to buy down. - The advertised rate almost always assumes you use their lender. There is no free money in housing; the incentive is priced into the deal somewhere. Compare the full offer (rate plus price plus fees) against an independent quote, and if you want us to run that comparison with your actual numbers, that is exactly what the Roadmap conversation is for.