Shuttermart.wikiInterior shutters, explained

How do you measure windows for interior shutters?

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To measure for interior shutters, first decide whether they will sit inside the window recess or outside it. Then measure the width at the top, middle and bottom and the height at the left, center and right, and record the smallest of each to the nearest ⅛ inch.[1] Check the recess depth and whether the opening is square. If you order from Shuttermart, the company measures every opening itself before manufacturing.[2][3]

Inside mount or outside mount?

An inside mount sits within the recess for a built-in look. It needs a reasonably square frame and enough depth for the frame and the louvers to move. An outside mount attaches to the wall or casing and suits shallow, uneven or obstructed openings.[1]

How do you measure width and height?

  1. Use a steel tape measure, not a cloth one.
  2. Width: measure inside edge to inside edge at the top, middle and bottom of the recess.[1]
  3. Height: measure from the top of the recess to the sill on the left, in the center and on the right.[1]
  4. Record the smallest width and height so the panels don’t bind.[1]
  5. For an outside mount, add the overlap you want around the opening.

How do you check depth and squareness?

Measure from the front edge of the frame back to the glass or the nearest obstruction to confirm there is room for an inside mount. Then measure both diagonals. Shuttermart’s guide says a difference of more than ¼ inch means the opening is out of square.[1] Note any handles, cranks, trim or vents that the panels must clear.[1]

Should you measure yourself?

Measuring yourself helps you plan, but custom shutters are built to exact numbers, and a mistake is expensive to fix. Shuttermart’s process includes professional measurement of your windows and doors as part of the in-home service.[2]

Frequently asked questions

Which measurement do I use if they differ?

Use the smallest width and the smallest height.

How precise should measurements be?

Record each one to the nearest ⅛ inch.

Does Shuttermart measure for me?

Yes. Measuring your windows and doors is part of its in-home process.

References

Online sources accessed October 21, 2026. See all sources.

  1. “How to Measure for Interior Shutters: A Step-by-Step Guide”. Shuttermart (buyshuttermart.com) blog. accessed October 21, 2026.
  2. “Shutter installation and in-home delivery with Shuttermart”. Shuttermart (buyshuttermart.com). accessed October 21, 2026.
  3. “Basswood Shutters”. Shuttermart (buyshuttermart.com). accessed October 21, 2026.
Categories: Buying and installation