I’m a DIY homeowner who’d like to get feedback on this idea: I’d like to build a small 1- or 2-bedroom guest cottage on my property, maybe 900 sq. ft. in size. For simplicity and cost savings I am interested in using a post-and-pier foundation.
My rural county’s building code may or may not allow this. Also I know that in earthquake country (I am in Kitsap County, WA) you need to watch out because a quake can make the posts of such a structure “walk” off the piers and wreck the building, unless additional strengthening measures are taken.
Aside from those two concerns, what else would be a problem with my plans? I understand that this is a more antiquated building style, but I read that it was commonly used for most small and medium homes built before World War II. Aside from quakes, what “killed off” the popularity of the post-and-pier foundation?