I am in the process of completeing my "man cave" 30 x 48 X 13" 18 foot front, one man door and 10 foot rear door with a 10 x15 concrete pad. Lighting I put in 8 of the 8 foot dual bulb flor, 200 amp service, concrete floor with vapor barrier, just put in a wood stove for heat. Mine is a "pole barn" style, metal sides and roof, with insulation. Since it is out in the country, no building codes to deal with. Doing a lot of the work myself we built it for less than 20K. I paid for it as I went over the past year, I am sure you can find an out of work or under worked construction crew or individual. Get for ready for this. My total labor cost was only $3,000. I paid for all of the materials, my concrete floor, vapor barrier, steel, smooth finish, stress cuts was only $3000.00 Good Luck, PS it is already too small, 1 47 Sedan, 1 49 Coupe, 1 48 Dodge, 1 67 Massey Ferguson tractor, golf cart, riding lawnmower and my 02 Ford Pickup