After collaborating with architect Dan Weller, we constructed this ADU (accessory dwelling unit) in the parking area of our homeowner’s lakefront property. A detached two-car garage sits on the ground level. On top is a 528 sq. ft. studio apartment. The finished residence features a modern kitchen, a 3/4 bath, a living space with a built-in Murphy bed — and stunning views of Lake Washington.

Project cost: $130,000

Project duration: 9 months