Wait, what? Why wouldn't you want to have a basement down there instead of all that huge wasted crawl space and ridiculous number of 4x4 posts? This is very odd to see while sitting here in climate and ground-stable Michigan.
Which raises another question for me: It looks like if you just slid the house back 20 feet, you basically could have filled the dirt in and not really been "building on a slope". What would the foundation requirements in WA be like in that case?This is the norm on the west coast, especially when building on a slope. The whole crawl space will be insulated, vapor barrier, sealed, and conditioned.