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The material costs include reinforcing mesh, concrete (about 50 square feet per cubic yard), and a bit of utility wire. $2.50 per square foot of garage floor slab. Goldenseal calculates the floor area for the garage, and uses it for this unit cost.
It doesn't include labor, supplies such as reinforcing bar, if needed, or building permit fees. At the time of publication, the average cost of concrete for a 400-square foot slab, the typical size for a two-car garage, ranges between $583 and $637 or between $1.46 and $1.59 per square foot.On average, contractors will put in about 13 hours of labor to finish a two-car concrete garage slab.he total cost for a 400-square-foot garage floor in San Francisco ranges between $3.91 and $4.28 per square foot and between $3.26 and $3.60 per square foot in Atlanta. In suburban Chicago, the same floor will cost between $3.70 and $4.05 per square foot.