Cost to Paint a Room per Square Foot Size of Room (Sq.Ft.)Average Cost to Paint Walls Only (Labor Included) 100 sq.ft. (10' x 10')$150 - $350 120 sq.ft. (10' x 12')$180 - $420 144 sq.ft. (12' x 12')$215 - $505 200 sq.ft. (14' x 14')$300 - $700 4 more rows