Let’s face it, one of the most significant costs of your shop will be its foundation. While you’re at it, what about adding space above your shop? There may be regulations preventing you from building living space above your shop if it is in an urban setting or in an outbuilding, but there may be some flexibility depending on where you live. It is in the municipality’s interests to encourage infill housing that uses existing infrastructure. At a minimum, think about including attic trusses to create some space above your shop for drying lumber or storing equipment. Access could be from simple pull-down attic stairs or from the exterior if you don’t want to lose floor space to a stair or ladder. If you’re creating an addition to your house, you may be able to add a couple of rooms you’ve always wanted, such as a family room, office or in-law suite.
I have never worked with my bench up against the wall, because I like to work from all 4 sides of my bench. I do like my machines pushed up against the wall and a large open space in the middle of the shop to facilitate easier movement. I have a Minimax combination machine so by necessity my tablesaw and jointer/planer are bundled together but I would actually prefer they not be (like a Felder machine that breaks apart). I would never put my tablesaw central in my shop, always at one end with a clear entry and egress for the sliding table, space permitting. Putting a tablesaw in the middle always struck me as one thing I’d always have to walk around and/or fight the temptation to stack stuff on it.
In general, a table saw requires at least eight feet in front and behind to accommodate standard sheet goods and four feet side to side. A work table should provide four feet clearance on all sides, and pathways between tables, benches and storage units should be three feet wide. Proper clearance will allow you to move about with ease while you work.
Some of the most important decisions in laying out a shop involve the placement of basic machines, such as the table saw and jointer. Deciding where to put them depends in part on the scale of woodworking you do, which determines the clearance area around these machines if you need to handle long stock or large sheet goods. You’ll also want to consider work flow to avoid an excess amount of running around the shop to accomplish tasks, as well as how to power your machines without turning your shop into a snakepit of extension cords.