Here are my requirements for the project:
At least 2 bays with 16 foot wide door, the height of at least 11 ft, since I want to park the boat in there too. (That boat is another story...wifey none too happy.)
I need enough space for my woodworking machinery with the table saw being the center of the bay with at least 8 ft clearance on every side, so I can rip 8 ft sheets.
You know I have the black car trailer, that is 23 ft long or so, don't want to have to keep that outside.
Lots of room for storage racks, If these go upstairs, a really big stairwell and heavy duty floor to hold more weight than I would ever imagine.
Lots of insulation, since I must have it heated in the winter, I spent an entire winter in the old garage with a torpedo kerosene heater, really didn't heat the space but did catch my pants on fire more than once.
Bathroom, preferably with shower.... getting older, can't get too far...tired of using the woods...another minor thing the wifey is unhappy about.
Originally I had planned the upstairs finished space to be pre-plumbed so that I could later turn it into a guest apartment, but the health department nixed that. The building would have to b e non living space, since my septic was grandfathered and any changes in the load would require an entire new system. $80,000 is not in the budget. Interestingly, as long as you don't add a bedroom you can add as many bathrooms as you want, supposedly because no change in the number of people able to live there. Well, I did stub out the sewer riser in the utility room, so in the future....someone could...
One bathroom on the main floor should suffice...
We went back and forth with this as a connected v.s. freestanding building, but the health department again said if it was free standing, I couldn't connect into the house sewer line.
Then it was just a matter of how to connect to the house. The zoning folks said as long as there was a physical connection, such as a breezeway or covered walk, that counted. I wondered why there were so many houses in my neighborhood with unattached secondary garages with covered breezeways.
I didn't want to go outside in crappy weather to get to my shop anyway, so connected it was. A badly photoshopped mockup:
Just enough overlap for the stairwell and door to the old garage. I wanted a straight shot up the stairs for big stuff, I learned my lesson in MIchigan, a 90 degree landing is a pain.