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I plan on building a large shop building on my property and while I want the main shop area to be a thick concrete slab, it would be great if I can make the adjoining rooms have a crawl space-like foundation to save on the cost of the required concrete. Is this something that is done and would be allowed? I am learning as I go so sorry if this is a stupid question.

  • Are you OK with a step up (or two) into the crawlspace rooms, because the different foundation types will most likely lead to different levels. – JPhi1618 Oct 17 '17 at 16:08
  • Oh really? Why is that? Yes I believe I would be. – user41178 Oct 18 '17 at 2:55
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Certainly. Split-level homes around the world (including my own) have such a scenario. Often it's a full-height basement foundation wall instead of a crawl space, but the general idea is the same. Of course, it's all subject to review and approval by an architect or engineer.

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My home is build this way. Since it is built on a slope the garage located at the lowest level has a solid concrete foundation, however the portion of the house that is not over the garage has a crawl space.

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