Once again, in your example, demand has not changed. Quantity demanded has, because the price has gone up. From an economic standpoint, there is a distinct difference.

In your example, cost of materials has gone up, increasing the price of the finished home. In that case, the supply curve will move back resulting in a higher price, and a smaller quantity demanded.

If demand had changed, as you are claiming, you would see the price drop and the quantity demanded fall as the demand curve shifted back.

You're mixing your economic terms.