This is for you and for some others that may not have thought of it, but after you get it built, make sure you get it, and your house appraised so you get the equity that you just built up. on paper. A garage will add a few bucks to your taxes for the year, but you want to be sure that if anything happened (God forbid) you get what you deserve. You can build something like that for say, $20,000.00 if you DIY, but you want it on paper what it is actually worth if someone else would have to build it turnkey. That $20,000.00 building may add another $40,000.00 or more in equity to your home.
Don't get so excited with your new garage that you fail to notify your insurance company what you now have. I know that with my garage, if I add a 24'x24' addition to it, it only raises my insurance by around $120/year, but it would be covered.
To the OP....if you haven't bought any insulation, doors, or windows, you may want to see if you can get that done before years end so that you can get any tax breaks on the energy items if there are any. Just a suggestion.
And for everyone on here, the new year will be coming up shortly, make sure your Smoke Detectors in the house are up to par, any security cams and such are up to par, and notify your insurance company of any changes made or large purchases bought so that they be covered in the event that something would happen. I get in touch with my Insurance Agent every year to go over things to make sure we are up to date and covered.