There are benefits to either approach. Sharing a common wall with your house can require some careful soundproofing but can reduce heat loss and exterior finishing costs like siding. A shop located in an addition is more likely to be allowed to have living space or storage space above it, and it may be easier to make use of the existing plumbing and electrical and heating systems of your home to service your shop space. Another advantage of an addition is not having to run to an outbuilding in minus-30-degree weather or a summer downpour.
When you design your workshop setup, climate control often gets ignored — and that’s a huge mistake! If your workshop or hobby room is in an unconditioned space like a garage or basement, you could find that it’s brutally uncomfortable to work in there during warm weather. You’ll be much happier with a solid fan — or several — to keep air moving for your comfort.
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.
Unless you’re a big fan of frequent shop remodeling, planning the layout of your workshop early in its development will save you a lot of time and trouble and also can keep you from spending years in an uncomfortable, poorly organized space. And if you already work in a shop that’s as organized as a trailer park after a tornado, careful planning and a little remodeling is likely to help you make a quantum leap.