Standard 2 hole concrete blocks.
FWIW, my 'on grade' (uninspected) choice, on our sandy flat site, was to build a conventional treated 2x4 platform frame, anchored with Simpson Strong Ties, to 4" concrete filled sonotube pads that simply lay atop the ground. The top of the 2x6 decking is a mere 9" above ground level. I anchored each lowest 'cross' of my yurt walls to the 2x6 decking with 3/4" steel angles I custom made. Absolutely bombproof deck and yurt anchorage.
If there is any issue with frost, deal with it. You got your yurt investment to support. I suggest build a free standing wood deck atop concrete filled sonotube piers set down to frost level. Sway brace between your wood posts as the site and deck height dictate. Anchor your yurt to the decking. Preferably like mine. lol
If you need engineered, and inspected, for
and code reasons, tell the engineering firm you plan to anchor your yurt to an affordable conventional free standing deck. I'll bet he will propose the exact platform I described.
Remember YOUR investment rides on that platform. Don't screw around. Good luck.
Re: On grade versus sunken piers
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