For one thing, the rearrange-it-later approach may simply mean that once you’re set up, the haphazard plan becomes the permanent plan, thanks to sheer inertia (it is a pain to move furniture, after all, especially when some of it is as heavy and awkward as workbenches and stationary tools). For another, too little advance planning may mean you buy a power tool that’s too big for your space.
If you want to run a business operated by yourself and more than one employee, you may run into zoning issues if your location is zoned for residential use only. It’s common for municipalities to allow and encourage home-based businesses but there will likely be a maximum area that you will be permitted to add for business purposes. If you try to build a shop that will contribute noise and traffic (from employees or deliveries) to an urban neighbourhood, you run the risk of running into opposition from neighbours concerned by the impact your shop will have. Your municipality will have planners with whom you should consult as you begin to define the possibilities that your property will allow.
Natural Light. Natural light is best, so any windows that offer illumination to the space should be put to good use. If you have little sunlight in your shop, locate your workbench so that its work surface gets whatever there is. Even the best eyesight is made better by good light, so the close work to be done on a benchtop benefits from the natural light.
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.