I had 10' before...and it's tight. 12' is the perfect height...but with an 1800 SQ FT garage, you can easily fit 6-8 cars on the ground if you build it right.

I'm in 1000...with a lot of useless lost space and I have 3 on the ground. Had I built from scratch...It'd be an easy 6 cars in 1400 SQ FT...

Lifts are a huge PITA and a last resort... I have 2...and would rather have a larger garage.