One look at this simple bath house, and we see a completely different purpose: a perfect, one-bedroom tiny cottage. Located in Pt. Reyes (CA), the bath house is used for summer fun at a seaside family compound.
Fortunately, architect Heidi Richardson creates flexible designs so you may re-arrange this tiny cottage with a larger great room, smaller bathroom and separate bedroom or sleeping area. Her building plans are for sale, with customizations extra, through houseplans.com.

This tiny place is inviting and simple. It’s 150 sq. ft. for the main room, plus another 70 sq. ft. for storage or internal expansion. (Houseplans.com)