How to Replace Bathroom Cabinet Doors | Measure First, Order Once

Replacing bathroom cabinet doors is a measure-and-order job: measure the opening, add one inch for a standard overlay, then order matching doors that fit.

Getting new cabinet doors for a dated bathroom vanity is one of the fastest ways to refresh the space short of a full remodel. The catch: you only order once, so the measuring has to be right the first time. Replacing bathroom cabinet doors comes down to three numbers—opening width, opening height, and the overlay you need. Get those right and the rest is straightforward. Get them wrong and you’re paying return shipping or waiting another week for a corrected order. Here’s the measuring method that works for any framed cabinet opening.

Measure the Cabinet Opening, Not the Door

The most common mistake is measuring the visible face of the existing door. That number only helps if you’re ordering an exact duplicate from the same manufacturer. For replacement doors ordered to fit an opening, you measure the opening itself. Start with the door removed or fully open so nothing blocks the frame.

For width, measure from the inside edge of the left stile—the vertical frame piece—to the inside edge of the right stile. For height, measure from the inside edge of the bottom rail to the inside edge of the top rail. Record both to the nearest 1/16 inch. Lowe’s installation guides use exactly these reference points, and they apply to any standard framed cabinet where the face frame sits flush around the opening.

This method works only for framed cabinets. If your vanity uses a frameless or European-style construction, the measurement logic changes, so confirm the cabinet style before you order anything.

Add the Overlay to Get Your Door Size

A cabinet door sits on top of the face frame, covering the opening plus a margin of frame on all sides. That margin is the overlay. For a standard 1/2-inch overlay—the most common style in production cabinets—you add 1 inch to both the measured opening width and height. An opening that measures 14 inches wide by 30 inches tall takes a door roughly 15 inches by 31 inches.

Door thickness matters too. One manufacturer’s listings specify a standard door thickness of 13/16 inch, with 3/4 inch available on request. Thicker doors need different hinges or deeper recesses, so match the thickness to your existing hinge hardware whenever possible.

• Single door: opening width + 1 inch, opening height + 1 inch.
• Double doors: total opening width + 1 inch, divide by 2, then subtract 1/16 inch per door for the center gap.
• Existing hardware: match hinge style (surface-mount vs. concealed European) and door thickness to what you already have.

For double doors on one opening, the 1/16-inch reveal keeps the two doors from rubbing when they swing. Skip it and you’ll hear it every time you open the vanity.

Confirming Overlay and Hinge Style Before You Order

If you’re replacing doors but keeping the existing cabinet boxes, verify the overlay before ordering. One straightforward method from professional cabinet shops: with the door closed, place a strip of masking tape on the face frame right at the edge of the door, then open the door and measure from the tape mark to the inside edge of the opening. That distance is your actual overlay. Do this on both a hinge side and the top or bottom to confirm the overlay is consistent.

If your cabinets use concealed European hinges, the hinge itself usually allows a few millimeters of side-to-side adjustment after installation. That adjustment range can forgive small measuring errors on width, but it won’t fix a door that’s undersized by half an inch. The height still needs to be right.

Replacement costs vary widely. Ordering doors yourself and installing them drops that number to just the materials, which is exactly why measuring matters—the money you save on labor goes straight back out the window if you order wrong.

If you’re comparing options or want to see what’s available without the measuring headache, our replacement bathroom cabinet doors roundup covers tested sources that fit standard openings.

Common Mistakes That Waste Time and Money

Three errors account for most botched replacement-door orders. First, measuring the visible door face rather than the opening you’re covering—the door is already bigger than the opening by design, so copying its dimensions gives you a door that won’t fit. Second, forgetting the overlay applies to both sides and the top and bottom, which produces doors undersized by exactly the margin you skipped. Third, skipping the reveal gap on double doors, which causes rubbing and damaged edges over time.

One more: assuming every cabinet uses the same construction. Face-frame cabinets measure one way; frameless cabinets measure another. A replacement door from a refacing supplier assumes a face-frame cabinet with a 1/2-inch overlay. If your vanity is frameless, standard replacement listings won’t fit.

Replacement bathroom cabinet doors range from budget spares to custom-milled panels depending on the supplier and material. Door thickness, hinge compatibility, and finish matching all factor into the final choice. Measure twice, confirm the overlay, and match the hardware—then order.