Being a carpenter, I've built my share of garages.
- I would definately go 2x6 walls. Not only do you get better insulation, the walls are much stronger. You'll find when you close a door on a 2x4 wall, the wall will shake.
- If possible go with the two doors instaed of one. Its much easier to park two vehicles in the garage and less heat leaves when the door opens.
- An 8' door is nice to have too, but if you don't plan on parking anything bigger than a car and a half ton in the garage, 7' should be fine.
- Put in the extra electrical even if you don't think you'll need it till later.
- If your floor isn't poured yet, put in a floor drain. I never put one in mine and I regret it every winter when my truck thaws out after it's snowed.
- If you are looking to insulate the garage, blow in an extra R20 into the ceiling and make it R60 instead of R40. You'll have less heat loss that way.
- I have a radiant heater in mine and I really like it. Less heat is lost with radiant because it heats the objects instead of the air in the garage. However if your walls are only 8' high, it can damage the paint on cars if it is set too high, so only use it if you build 9 or 10ft walls.
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