The standard option for a shop floor is a concrete slab. You’re probably not going to go to the trouble of creating a basement beneath your shop, although it is possible. The weight of most woodworking machines suggests that a concrete floor is the most solid and durable substrate available. It has the potential to be used as thermal mass to store heat from your heating system or from the sun, but it can be tiring and hard on your body to be standing on concrete all the time. You can add a vapour barrier, 2x4 sleepers and a wooden floor above the concrete to ease the tendency of the floor to strain your feet and back, or you can add anti-fatigue mats in key areas where you’ll be standing for longer periods.
If you have a fixed-in-place cutoff saw (a radial-arm, miter saw, or sawbuck, for example), it can, unlike the table saw, be conveniently positioned against a wall. Don’t set it in a corner, however, as you’ll need space on either side of the blade. Figure into your plan a two-foot-deep, three-foot-wide space for the saw itself and tables or other supports flanking the tool. Allow enough space directly in front of the saw for the operator to be able to comfortably line up and operate the saw.
Before you bid in an online auction, check the site’s rules of operation. At some sites, a winning bid is a binding contract, which can be a problem if you can’t inspect the tool before you purchase it. Don’t forget shipping costs. In some cases they can exceed the cost of the tool. Also, make sure the tool you’re buying will run on the power you have in your shop. Many former industrial tools run on 240v single-phase power. If your shop doesn’t have 240v service, you’ll need to factor in the cost of upgrading before deciding to buy. You don’t want to saddle yourself with a tool you can’t use, no matter how good the price.
As the comic George Carlin might say, a shop is mostly just “a place to put your stuff.” The physical aspect of a shop is indeed simply a space of some kind — a garage, a barn, a teepee — that keeps the rain, rust, and robbers away and houses a collection of implements needed to saw, plane, slice, sand, and pound raw wood into useful objects. But just like the difference between a house and a home, what transforms a building full of tools into a comfortable workshop goes beyond the mere physical aspect.