Out-of-Square Windows
Very few windows are perfectly square. Small variations are common, especially in older homes, and plantation shutters may often disguise those irregularities extremely well when measured and framed properly.
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I think my windows are out-of-square. Can I still install shutters?
Yes. Measure the width at the top, middle and bottom, then measure the height at the left, centre and right. Record every dimension instead of assuming the opening is square.
You can also compare the two diagonal dimensions as an additional check, but the three-width and three-height dimensions are still needed when planning the shutter.
If there’s a difference of up to 10mm between your dimensions, get in touch with us so we can discuss the best shutter option for the window opening. If the difference is more than 15mm, we’ll typically recommend an outside mount L-frame — more on this below.
If the dimensions vary noticeably, contact trade support before releasing the order so the frame and mounting method can be considered. A Z-frame can be especially effective at hiding small bows because its front lip overlaps the edge of the recess.
Where the opening is significantly out-of-square or unsuitable for an inside fit, an outside L-frame can create a visibly square shutter in front of the irregular opening.
The key isn’t to force a perfectly rectangular shutter into a recess without allowing for the smallest dimensions and the amount the opening varies.
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Need trade support?
Send our trade team the window opening dimensions and photos if anything is unclear about the right shutter setup.
