More cabinet door orders go wrong at the tape measure than anywhere else in the process. A door built to the wrong number is scrap — there's no sanding a door bigger. The good news is that nearly every measuring mistake is predictable and avoidable once you know what to watch for. Here are the errors we see most often, why they happen, and exactly how to keep them off your order.
Reversing width and height
Cabinet doors are always written width × height (W × H), in that order. Swapping the two is the single most common measuring mistake, and it turns a tall pantry door into a squat wide one. It's an easy slip when you're working fast across a whole kitchen.
Write every size the same way, every time — W first, H second — and double-check tall doors and drawer fronts, where a reversal is most obvious and most costly. If you send an order to a manufacturer, label your columns clearly. Our measuring guide shows the standard notation.
Copying the old door instead of measuring the opening
Old doors warp, swell, and get sanded over years of use, so copying their exact dimensions carries forward decades of error. For overlay doors, the reliable method is to measure the cabinet opening — the actual hole in the face frame — and then add your overlay.
For a standard ½" overlay on all sides, add 1" to the opening's width and 1" to its height. A 12" × 24" opening becomes a 13" × 25" door. If you'd rather not do the math, give the manufacturer the opening size and the overlay you want and let them calculate it — that's routine work for a door shop. See our replacement measuring guide for the full walkthrough.
Not accounting for out-of-square openings
Face frames are rarely perfectly square, especially in older homes. If you measure width in just one spot, you can miss a frame that's ⅛" wider at the top than the bottom. Measure width in two or three places (top, middle, bottom) and height on both sides, then use the smallest reading for a safe fit.
This matters most for inset doors, which live inside the opening with a tight reveal all around. Two openings labeled '24 inches' in the same run can differ by an eighth of an inch or more, so measure every opening individually rather than assuming they're identical.
Forgetting the gap between paired doors
When two doors share a single wide opening, they need a small gap between them — typically about ⅛" — so they don't rub or bind when both are closed. Measuring each door as if it had the full opening to itself produces a pair that overlaps in the middle.
Split the opening, apply your overlay to the outside edges, and subtract the center gap between the pair. If you're unsure how to divide it, tell the manufacturer it's a double-door opening and give the total opening size — they'll split it correctly.
Ignoring hinge bore, thickness, and drawer fronts
If you're reusing concealed cup hinges, the doors need a 35 mm bore in the right location for your hinge brand and overlay. Ordering doors without specifying the bore — or with the wrong bore spec — means they won't hang correctly. Confirm thickness too; most doors are ¾", and hinge cups depend on it. Note the hinge brand and model on the order, or ask our hinges team what to specify.
Don't forget drawer fronts. They follow the same overlay logic as doors but are measured to the drawer opening, and their overlay should match the doors so the run looks uniform. Mismatched overlays are a classic DIY eyesore. When your list is complete, send it over — request a quote and we'll double-check the numbers before production.
Frequently asked questions
Should I measure the opening or the old door? For overlay doors, measure the opening and add your overlay. Old doors distort over time, so copying them carries forward errors. Inset doors are measured to the opening minus the reveal.
How much do I add for overlay? For a standard ½" overlay on all four sides, add 1" to both the opening width and height. If your overlay differs, adjust accordingly, or give the manufacturer the opening size and overlay amount.
What gap should paired doors have? Typically about ⅛" between the two doors so they don't rub when closed. Split the opening, apply overlay to the outer edges, and subtract the center gap.
What if my openings aren't square? Measure width and height in multiple spots and use the smallest reading. Measure every opening individually rather than assuming a run is uniform, especially for inset doors.