Okay, so the property we are moving to has LOTS of big sheds. I'm wondering if I could build stables in there? What would the best materials be to use? How big would I need to make them, would it be best to line the bottoms with rubber?
Your buildings definitely look like possibilities. The building sizes would be needed for a good discussion. The size of your stalls will depend on how big your horses are and how much time they'll be spending in their stalls. In my barn, I have 10 ft x 10.5 ft stalls (with rubber mats that I certainly would recommend) as my horses aren't that big (15 hands is the biggest) and they don't spend a great deal of time in the stalls other than their daily grain feed and going in over night in the winter months. A lot of people will put 12 ft x 12 ft stalls in. And, of course, a tack room and/or feed room in the same building as the stalls is always a bonus.
Lotsa good possibilities but I wouldn't use the one off of the ground for horses. I'd geuss it was maybe used for grain storage? Never did any farming so not sure but I think I would maybe use that building for a combination feed/ tack room. Anything ground level just check out really well for any exposed edges of tin that anyone could get cut on.
Second and third ones would make excellent run ins or stalls. The first one? No, just no. As oobie stated, you never want to house horses off the ground. They could break through the flooring.
I have 3 utility bays I turned into stalls. Mine are 10'X24', and I added 10' gates to the entrances. You don't have to get fancy. If the floors are dirt you won't need rubber mats, just keep them bedded down with shavings or sawdust.