From what I heard, from an architect friend, the difference in price between a builder and custom home is 10% premium. Because whatever economy of scale saved b

From what I heard, from an architect friend, the difference in price between a builder and custom home is 10% premium. Because whatever economy of scale saved by the build is taken up in profit. To the buyer prices are just about the same. And conveniently, the commission for an architect is also 10%. So if you can design and self certify you also save a bit.