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.
Your sense of space and how to use it will be slightly different depending on the focus of your craft. If you are building furniture with hand tools, you will be able to make do with less space (under 300 sq ft.) than if you’re using mainly power tools and building sets of cabinets (over 400 sq ft.). Some 3D mod­elling with a program like Sketch-Up or some 2D layouts on graph paper with scaled cutouts can allow you to experi­ment with arranging your space and how much of it you will need. You should include not only the tools, benches and storage that you currently possess but also enough room to tackle new types of projects and new tools that you antici­pate needing down the road. When you think you have a layout that works, test it out by mentally working through a range of different projects you might tackle and the needs you will have for material storage, assembly and finishing. Then revise as necessary; this process will allow you to hone in on a general square footage and layout ideas that will set you up to move forward.
One of the challenges in building a cabinet for hand tools, is that as soon as you define a place for each tool in your custom cabinet, you find that you need more room to store the must have tools you just bought. I decided to make a couple of open cabinets, and employ the use of inserts that can be replaced or modified as my tool collection grows. Part of the goal was to make a clean, efficient shop, while keeping to a budget. I bought paint grade maple plywood and made the cabinets. Applying a solid maple face frame to the cabinet makes a clean looking cabinet from sheet goods purchased at $50/sheet.
A few months ago Dave Heller, a custom furniture maker and Marquetry expert, reached out to me about teaching at the Wood and Shop Traditional Woodworking School. When he brought over some of his fine furniture, I was really impressed. He's truly an artist, and way better than me! (You can see his furniture here on his website and here on his Instagram account). Like many woodworkers, Dave first pursued woodworking as a hobby. He
My advice here is to make a detailed list of what the various parts of the build will be (drawings, permits, foun­dation, framing, electrical, etc.) and decide what you would like to do yourself and what you will need to hire others to do. Get quotes on the work that you would like to hire out and estimate the materials you will need to do your por­tion. You may want to factor in your time into the cost as well, especially if you will be passing up other income to work on the project. At some lumberyards, you will be able to give detailed drawings to an estimator on staff who will do a material takeoff list for you of what you’ll need and what it will cost. When all the numbers come in, you can put together a budget and plan for an overrun allowance of around 15 percent. If you keep track of the materials and subcontract costs as you go, you can stay on track and make decisions as you go about the latter stages of the project without regretting it later. If it is challenging to obtain fund­ing for a complete build, you may want to stage the build so that initially the frame goes up and the exterior is finished, and then you finish the interior work as you have time or as funds become available.
Clamping up four mitered corners is tricky. You can buy specialty clamps for this, but I make my own. Here’s how to do it. Start with a long 1×4, as it’s easier (and safer) to clamp for making the angled cuts than a short piece. Mark out the blocks, and then drill a 1-in. diameter hole in the center of each one. The hole prevents the blocks from getting glued to your project. Cut 45-degree angles tangent to the hole, and then cut the blocks free from the long board. We’ll walk you through how to make one for your home shop.
If your table saw is near a wall and your shop is fairly narrow, positioning the jointer and planer against the opposite wall is reasonable, as shown in option 2 in the illustration. If the shop isn’t long enough to accommodate long workpieces, try to put these machines near an operable doorway, as shown in the illustration and in the photo of Doug Warren’s shop.
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.