David... first..calculate how large in your wildest imagination you think it has to be... now double that and it will be almost big enough... also when you calculate the cost do the same thing but instead of double use square...now.. lighting is one of the most important things... flourescents are cheap but depending on climate don't give the best output in cold buildings..metal working and wood working need a lot of light to keep all your fingers attached and do good work.. plan a light over each stationary machine and at least one for every 20 sq ft of work area i.e. bench, layout table etc. I've got a mixture of 4' and 8' depending on area. My shop is only 25x25 and I have 4 8' 2bulb units and 4 4' 2 bulb and 2 4' 4 bulb units.. there is also 2 300 watt flood lights in the front area where I weld, cut etc and adjustable floods outside the shop for late afternoon evening light. can you tell I like light... don't put all of them on the same circuit... divide your circiuts by the work or area you are doing.. i.e. wood work on one , lathes and presses on one... that way you don't have to run all at once. outlets.. mine are every 4 feet on the wall, about 4' above the floor. on all walls ! with several multi plug strips over benches. Again divide the circuits..some folks even go so far as every other one on a different circuit.. that would be convenient.. I've been in a shop where the only light was a drop light... drilling and blew a fuse and you're in the dark ...can be scary finding the fuse box.. If you plan on stationary tools...saws, planers, lathes...each ought to be on seperate circuits.. vacuum system for wood work would be a nice addition... When you pipe for air... pipe overhead and bring your drops down the wall.. slope your main header toward one end with a drain to remove condensation. there is a really good schematic for shop plumbing in the TipTools site... the outside drop is a good idea, but put one out front also..nice to be able to blow off debris after working without dragging a hose across the shop. I'd seriously consider heating especially if you are in the colder areas.. I'm in alabama and I'm putting in a forced air unit this summer.. gonna find a take out furnace from one of the A/C companies and install it...plan to keep the shop around 50� in the winter... keeps down the humidity and the condensation on parts and tools, plus it's easy to warm it up quick.. that brings up insulation... put in all you can afford... ceiling first and walls next if you have to do it in pieces.. I finished my walls/ceiling with 1/4 plywood and painted white... amazing how much light it added over studded walls..... my brain is tired now... I'll think of more later and I'm sure there are some other good ideas coming... you're doing right to plan first..it will save you time and money.. gud luck john
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