They will probably need to move the building with the existing floor system and I suspect you will run into a fair bit of trouble (and expense) if/when you want to remove it from those floor joists. If, however, the contractor is disassembling the old building to move it, then it shouldn't be too much trouble to put on a slab.

I could be wrong and I'm sure some folks with more experience will chime in. Good luck!

It's not being disassembled to move it... it's coming all as one big building. I'm thinking more than not, that we'd really be impacting the structural integrity by trying to change the floor. Just seems such a shame we can't use the building as a garage!

Do you want to keep the wood floor? It is rare to see wood floors as garage floors. I've seen homes like this moved onto pour basement slabs (same concept as pile foundation...but with a basement instead of dirt.

If you want to keep the wood, then there has to be a way to keep the wood off of the concrete. An 18" crawl space (dirt covered with 6mil poly sheeting or cement) is always an option. The 18" crawl space would have to be cross vented/heated properly. This is for "keeping" the wood. Flooring. I'm not sure what has to be done to remove the wood floor and have the building sit (joists and all) on concrete. Remove the joists and you have plenty of stability problems.

You would need to speak with a local architect/building engineer who has some knowledge of what you are trying to do, soil conditions, etc. to get this right. In theory it can be done (we've just landed a small car on a comet...we should be able to put an old building on a cement slab)...I'm wondering about the expense to get it there (excavation + soil stabilization + concrete + piles, etc).

Thank you! I think it's probably a far bigger issue and complicated problem to try to remove the wood floor and put the building on a concrete slab. Unfortunately, we'll probably be "stuck" without being able to use it to park our cars in. It will however make a wonderful (huge) workshop/hobby shed... hardwood floors and all!