However, if you don’t have that information on hand, use a ruler or tape measure to measure the length and width of the home/room. You can enter this into an online calculator to determine the square footage.
As a general estimate, you can subtract about 20 square feet per door and 15 square feet per window. Say a 700 square foot room has one door and two windows. You would subtract 20 for the door, and 30 for the window, resulting in a square footage of 650.
Say you want two coats of a decent quality paint for a 650 square foot room, which requires six gallons of paint. If you plan to buy paint at $30 a gallon, expect to pay around $180 for paint.
Find the average cost of these supplies by visiting local suppliers and adding up the total. For example, say the masking plastic costs $25, the masking paper costs $15, the tape costs $10, the caulking costs $15, and the primer costs $20. This means cost of supplies is around $115.
For a small room, such as the 650 square foot example, it should only take a few hours. Divide 650 by 2,500 to get roughly . 25. This means you will probably only pay a quarter of the cost of a full day’s worth of work, meaning the paint job will be roughly $200.
Whether or not you need big ladders or scaffolding. If you have to paint overnight. Whether or not there are any wall repairs.
