How to Measure for Shutters

Tips Before You Get Started

  • Use a steel tape measure for the most accurate measurements
  • If you’re considering an Inside Mount, make sure your window has enough depth to accommodate it
  • Always measure width (left to right) first and height (top to bottom) second
  • Record all measurements to the closest 1/8”, making sure to clearly identify which is your height and which is your width—it is very common to get them mixed up

Determine Inside Mount or Outside Mount

  • Inside mount shutters available with Z-Frame or L-Frame options (requires more depth)
    • Finished, framed look
    • Least energy-efficient mount for shutters
  • Outside mount shutters cover beyond your window opening in width and height, L-Frame only
    • Mounts on trim or wall surface
    • Most energy-efficient mount for shutters

Measuring for Inside Mount

Note: Inside mount shutters will have a small deduction automatically applied by the manufacturer, to ensure proper fit


  • Start measurement at 1 ½” deep inside the window opening
  • Measure width at the top, center and bottom of your window opening, from edge to edge
  • Record the smallest measurement of the three to the closest 1/8”


  • Start measurement at 1 ½” deep inside the window opening
  • Measure height at the left, center and right, from top edge to bottom edge
  • Record the shortest measurement of the three to the closest 1/8”

Measuring for Outside Mount

Note: Outside mount shutters will have no deductions taken at the factory. They will be made according to your exact measurements.


  • Measure the area you want to cover (how far you want the shutters to overlap the window opening); we recommend 1 ½” on both sides
  • Record your measurement


  • Determine where you want the top of your shutter frame to be and mark the spot
  • Measure the height from the spot you marked to the top of the window sill. If there is no sill, measure down the window to your desired length
  • Record your measurement