I take the square foot of the window and add a few inches per side to account for wasted film. Then I have a set per square foot rate for Reflective/Dual Reflective films and the rate increases for more expensive films. Then add on charges if a ladder is required, any equipment rentals are needed, and a driving charge that increases with distance. If the windows are french pane or more difficult than regular windows, the rate increases. I also have a minimum charge depending on the distance. So say someone wants just a door tinted but is 15 miles away, it is an automatic $500 charge. We only do 1-2 flat glass jobs a month since we are pretty expensive which works for me since it is a headache and we stay busy with automotive all year.
