I know this is a nationwide issue, but I had to do something about it," says Hoek, founder and CEO of The Spiral Staircase. That's why she founded The Spiral Staircase; a social club just for women.

The ADU's listing is shown to include one bedroom and a spiral staircase to an optional deck. But the unit will cost more to complete the design with windows, doors, and other finishings.

Need a place for your girlfriends to gather for book club? How about a private workspace to complete tasks away from home? Looking for a safe space to give your children some playtime to wind down ...