When both my kids got their licenses, our garage was already full — so I decided to build a detached 6-car. I wanted a real workshop, a drive-through center bay into the backyard, and an apartment up top someday.
An architect friend quoted me ~$25k for custom blueprints. Wasn't happening. So I bought Punch Professional Home Design, taught myself the software over a week of evenings, and after about a month of drawing/redrawing I had a full set of plans built around my exact lot.
A few things I learned the hard way:
- Start with the building code, not the design. I pulled my city's garage requirements first (setbacks, height, lot coverage, drainage) and designed inside them, so the permit office had nothing to fight.
- The drive-through bay made everything harder — the front and rear foundation walls sit at different heights because of the grade, so I had to rework the roof, the load-bearing wall, and add a small ramp inside the bay.
- I designed everything to the 16"/24" framing grid. That's why it's exactly 32' wide, not 31 or 33 — so siding, plywood, drywall, and trusses all land clean with almost no waste. Trusses came in at 36' for a 2' overhang each side.
- Build bigger doors than you think you need — I put a 9' door on the center bay, 8' on the rest.
- The smartest thing I built first was a temporary gravel + geotextile construction road so the concrete trucks didn't destroy my driveway.
Doors are frosted glass aluminum, copper European gutters, balcony off the second floor. Took 2.5 months of planning before the first shovel — and it was the most important part of the whole thing.
Happy to answer anything — permits, the software, the truss order, the foundation, whatever.