Before: Sunny bungalow addition

Owners Gus and Stephanie Koven wanted to find a cost-effective way to unite the original 1,000-square-foot bungalow and its backyard. "You literally had to duck through a tunnel-like door and meander down steps to access the garden," says Gus, a sound designer and avid gardener. "The only view of the yard was through a small window in the bedroom."