what side is your door on, if its on the 30 foot side, you can put three rows of two, if its on the 40 foot side, it would be a little harder to put 2 deep. My buddy has a 28 x 40, with 3 doors on the 40 foot side, and you'd be hard pressed to put more then 3 in there. Of course there is a work bench the runs the entire length of the back wall.
My shop is 30x36. 22x30 has an 8' ceiling, and 14x30 has a 12' ceiling. As you can see, I can pretty easily fit 4 cars with one on the lift. But much of my shop is taking up with equipment, storage, 4 go karts, a motorcycle, a bathroom, a sink and work benches and a nice table and chairs for BS'ing. How many cars would fit would depend highly on how big the cars are and how much other stuff you have. Mine are all fairly small.
What I did in the planning stages was draw a scale plan view of the garage and of the things I wanted to put in it. That would give you a better idea how your items would fit. Also remember that when you say 30x40, unless you specified differently, that's an outside dimension. Since mine is insulated with finished walls, it's a bit smaller than that.
The configuration of your doors will determine how many you can fit in it. I've had a couple of 30X40 buildings, the one with dual overhead doors in the 30' end would fit five comfortably but the one with two doors in the 40' side made it a lot harder.
If you put the doors in the 30' end though you'll have to jockey cars around to get the ones in the back out.
I have a 52x40 pole barn but because of the way I designed it I have a main room that is 32x40.
In that room you can easily put 6 cars with no lift or work benches: 2 rows deep to 40' of 3 rows across simply pulled and parked. If you want to start stacking you could prob get 5 in sideway along one wall and then 2 pulled in straight down the other for a total of 7 crammed in...I have had 5 cars in the garage...2 shells pushed in close to the wall, 2 cars parked, and one car being worked on. Even with a lift you could still fit 6 cars in roughly the same configuration.
However, I said this is without work benches...so if 30x40 is your total working area I would say are looking at 4 (5 if you count putting on the lift and putting it in the air and parking one under it) with workbenches along the 40 foot wall on one side.
2 shells 'stacked' close to the wall
Room for a full size truck plus more in front....(right now I have a boat sitting in this location)
If you look close you will see that I also have 2 other mustangs in the picture.
I'll post up a bunch of pics off various fill levels of cars and stuff in the 32x40 section of my pole barn
The window you see in this photo by the white mustang is at teh 32 foot wide mark...as you can see though I have a 'side room' that is 20x20 that I open up into
The tall poles are the 32 foot mark from the far wall in this one
I would say that on average a car with a 100 [6x17] square foot footprint would need 200 square feet of space to allow for a comfortable working space around the car. On that basis I would expect that with 1200 square feet of space, you could be looking at between 4 and 6 cars more or less, depending upon the configuration of the space and the access. Obviously, other objects will eat into the space and total capacity will depend on what you've got in there besides the cars and the lift.
*67 Vintage Burgundy 390GTA with most of the bells and whistles*
My garage is 24x40, with the doors on the 24' side. If one of the bays didn't have a wall in the middle of it, I could fit 4 comfortably. As it stands, I have 3 cars in there, with the back corner blocked off as work space with my benches and toolbox, etc. in there.
My garage is 40' wide x 28' deep. There are two double doors on the front side. I have one Mustang sideways in the front & five parked side by side -- so six total. There is one parked in the middle between the two doors -- cannot be driven out unless one of the others are moved first. This arrangement is for winter storage only. Five cars wide is pretty tight across the 40'.
'66 Sprint 200 deluxe interior hardtop ( not a coupe ), owned since '84 as first car
'66 factory GT A code 4 speed ( now T5 ) fastback
After calculating the square of the hypotenuse, times a square pie, I can authoritatively state that it will hold one car less than you're going to want to put in it, no matter the size. The calculation equates to n-1 where n is the number you need to fit, and the -1 is how many short you'll be.
72/5.0/Holley Street Avenger 570 4v/3spd
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