Welcome to Tiny Homes, an idea that is more popular with minimalists than with neighborhood associations and zoning boards. We'll point out the fun parts. You'll have to check out the logistics and legalities - but this one's probably older than some of the ordinances.
Here's a list of words that rarely describe a house in Western Washington: waterfront, tiny, concrete. Waterfront houses are a small portion of local listings, but they're common enough. Tiny houses aren't as common, but they attract their own audience. Concrete houses - well - they're out there, but there aren't many of them. There's a concrete tiny house on Flowing Lake in Snohomish that has an asking price of $314,950, which includes 50 foot of waterfront property, the 1 bedroom, 1 bath, 356 square foot house, and 0.62 acres of land. There isn't much that is more solid than a concrete house (except one made of stone.) On the outside it looks like it is built for wildfires or hurricanes, and looks a bit unconventional in the Pacific Northwest. On the inside, it looks conventional and minimalist, the type of aesthetic tiny home folks appreciate. The appliances all may be a bit smaller than average, but they fit the space; rather than making the house fit the appliances. Enough space for a small, frugal household; a bit more space for projects and playing outside; and then if you want some more, go play on a lake that's big enough for water skiing.