09/08/2026
Three 20-footers welded side by side, and the middle walls came out entirely
This is the bit people underestimate. A single container gives you a room 7'9" wide β fine for an office, useless for a car. Weld three together and cut the shared walls out and you're at roughly 23 feet across, which is a proper double garage.
But those side walls were doing structural work. Take them out and the roof over that span has nothing holding it up, so a steel beam has to go in along each cut line before the wall comes out. Look at the ceiling in the interior shot and you can see where they run.
That beam work is most of the cost. Three used 20 ft boxes land somewhere around $6,000β10,500 delivered. Cutting, beams, welding, insulation, lining, electrics and the roller door push the finished figure to somewhere near $25,000β40,000 depending on spec.
Worth noting what they didn't skip. The whole inside is lined and insulated, there's a split system on the wall, and the roller door is full width instead of the standard container doors. Those three things are the difference between a garage you use in February and a metal box you avoid.
The interlocking floor tiles are the cheap bit β about $3β5 a square foot and they drop straight onto the container floor.
Would you have gone three wide, or built two containers with a gap and roofed the middle instead?
Cost figures are rough estimates and vary by location and project.
