Getting the size wrong means a return trip and wasted time. Measuring for bathroom vanity cabinet doors takes about five minutes with a tape measure, and one wrong number means the new door won’t fit. Here’s the process that gets it right the first time, plus the math for both overlay and inset styles.
Which Type of Cabinet Door Do You Have?
Before measuring, identify how the door sits on the cabinet frame—this detail changes every number you write down.
- Overlay doors sit on top of the cabinet face frame, covering the opening entirely. Most bathroom vanities use this style.
- Inset doors sit flush inside the cabinet opening, level with the frame. They need clearance gaps on every side.
- Full overlay vs. partial overlay describes how much of the frame the door covers — full overlay hides nearly all of it, partial leaves more exposed.
Frameless cabinets and face-frame cabinets also calculate differently. Open the door and look at the edge: a frame around the opening means face-frame; if the door sits almost flush with no visible lip, it’s frameless.
Measure the Existing Door or the Opening
Both reliable methods start with removing the door when you can—a flat door is far easier to measure accurately than an opening with hinges and stops in the way. Open the door fully and lift it off the hinge pins, or unscrew the hinges. Lay it flat and measure width from left to right, then height from top to bottom, recording both to the nearest 1/16 inch. Mark hinge locations with tape before removing the door to confirm your overlay when ordering.
When removal isn’t possible, measure the cabinet opening from inside edge to inside edge, then apply the math below.
- Overlay doors:
Common Measuring Mistakes That Ruin the Fit
Most ill-fitting replacements trace back to four errors, each easy to avoid. First, measuring a single point on a warped opening—bathroom humidity warps frames, so check width at top, middle, and bottom, then use the largest reading. Second, forgetting overlay math—ordering a door matching the opening exactly leaves it too small for an overlay cabinet. Third, skipping the inter-door gap on double doors causes collisions. Fourth, measuring from the outer cabinet face instead of the opening’s inside edges.
Door thickness matters less for sizing than hinge compatibility.
Sizing the Replacement and What to Order
Record width and height to the nearest 1/16 inch, then bring those numbers plus the door style (overlay or inset), hinge hole pattern, and right- or left-handed orientation to your supplier. Our tested roundup of quality bathroom vanity cabinet doors helps compare materials and finishes once your measurements are locked in.
When numbers don’t match a standard size, custom doors are the answer—suppliers routinely cut to any dimension, and the extra cost is modest compared with a door that doesn’t fit.
FAQs
What’s the standard gap between double cabinet doors?
Double cabinet doors typically need a 1/8-inch gap between them so they swing freely without colliding. To size each door, measure the full opening width, subtract that 1/8-inch gap, then divide the remainder by two.
Should I measure the door or the opening for replacement cabinets?
Measure the existing door whenever you can remove it, since a flat door gives the most accurate reading. If removal isn’t possible, measure the cabinet opening from inside edge to inside edge, then add overlay or subtract clearance based on your style. Both methods work; the door method is simply more forgiving.
How much overlay should a bathroom vanity door have?
Full overlay uses a larger spec, so verify your existing door’s coverage before ordering.
References & Sources
- Home Depot. “How to Measure for a Bathroom Vanity.” Covers standard vanity widths and measurement basics.
- Cabinet Doors. “How to Measure Cabinet Doors: The Full Guide.” Details overlay and inset measurement formulas for replacement doors.
- Eagle Woodworking. “Cabinet Door Measuring Instructions.” Provides step-by-step guidance for measuring existing doors and openings.