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You could do the halfway house and look at Oakwood garden Rooms on YouTube/the gram who bed 25mm threaded rod in short concrete piers. I've heard groundscrews take a fair amount of getting into the ground, and theey aren't cheap. Not got round to actually doing anything myself yet. I need to renovate the house and build some garage doors.
Grumpy_Git
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Changing topic, has anyone got experience with installing groundscrews themselves? After seeing @lowbrows garden room being built on them, I fancy those over concrete as if I do it myself, it's about half the cost and I would have thought more environmentally responsible. Also, better airflow etc to help with the wooden workshop/shed going on top not rotting from the ground up.
It doesn't look too hard. Pilot drill with 25mm SDS+ (I'm guessing this is more to check if there's anything too solid in the way - I can source a 1000mm long bit easily enough), then screw in either with a manual tool or one of those big electric braced drill type jobbies (I would start with the former and rent the latter if I find they're not going in). I'm also guessing it might be better to do it over winter when the ground is softer than in summer, or is that a bad idea? Then just stop screwing when level.
Unsure how big to go. As usual, I'm thinking of maybe over engineering it and getting the 1200mm screws. Unless anyone thinks I should go bigger.