Cost for free standing 2 car garage

[Track Junky]

I'm in Nor Cal and if I were to build a detached garage for someone I would charge in the ball park $60 per s.f. assuming the lot was flat, grading and clearing at a minimum, and no retaining walls to build. Permits shouldn't be an issue but the percentage of structural coverage allowed on a residential lot will have its limits so it might be wise to speak with someone at your local building department before committing. The cement siding you are refering to is called Hardi Plank.