Between 705 & 1200 SQ/FT Would like to build a 30x30 garage

[NES]

I would like to build a 30x30 garage with a 12 ceiling. The garage door would be 18' wide and 10' tall. The garage door would be on the front on the garage and off to the one side, on the left side

What's the biggest size boat that I could fit in the garage at a diagonal angle?

 

[penutbuter]

30 x 30 will give you about a 40' diagonal inside but you will need to consider trailer length and also door placement. Most buildings you won't get much closer than 2' from the outside wall on a garage door, just because of structural support. so that is going to remove some length. Also the width, if it's a pontoon boat you won't get anywhere near as long as a jet boat or Duckworth because of the interference.

Get an idea of what size boats you would like and draw it out on grid paper, or use google sketchup or On-Shape to model the space and boat.

 

[NES]

Cool thank you there. The beam on the boats that I like are 8' to 8'6" wide. Length of the boat itself would be 20-23'. With the trailer and drive probably 27- 30' long.