While an angled bay that's large and can be walked into will work magic in a home, a small, preassembled angled bay above a kitchen sink will totally change the dynamics of a kitchen.Budget: While site-built, custom angled bays can cost well into five figures, a smaller, preassembled bay can be a cost-effective way to get some extra space and light into your home. Many preassembled angled bays sell for less than $1,000, so it won't take much to change your interior with one of these.