I live in a condo with a garage that is generously listed at 20'x20'. Actual measure from the back wall to the lip on the garage door is 19'4". My boat is just under 17' feet and, as noted above, measures just about 23' at full flower. I have a swing tongue and that, along with some creative angling, allows me to get my boat in the garage. Even the salesman at the marina expressed doubt I could get it in. I told him I could get it in but I wasn't sure I could still get my Jeep in. Worked out good.
I back it in to a marked spot on the floor, drop the motor down and turn it full port, swing the tongue and push it back while pushing the bow toward the wall. When I'm done, the engine cowling is barely touching the back wall and the forward part of the tongue is about an inch behind the door track.Still plenty of room for the Jeep.