Bathroom Vanity Hinge Replacement: Step-by-Step

Vanity door hinges take a steady beating in a bathroom: humidity swings, repeated opening and closing, and the weight of a solid door pulling on the same few screws day after day. Eventually a hinge sags, squeaks, or fails outright, letting a door hang crooked or drop off the cabinet. Replacing a hinge is genuinely one of the easier cabinet repairs, but getting the wrong part because of a mismatched bore size or mounting style is the most common way this simple job goes wrong.

This guide covers identifying your current hinge type, adjusting before replacing, and the full replacement process for both concealed and exposed hinge styles.

Concealed vs. Exposed Hinges: Which Does Your Vanity Use?

Quick Identification Checklist

• Door overlaps the cabinet frame and no hardware is visible from the front: concealed cup hinge.
• Small decorative hinge visible on the door face near the edge, door overlaps the frame: surface-mount exposed hinge.
• Door sits flush inside the frame opening (inset) with a visible hinge along the door's edge: butt hinge.
• Door slides on a track rather than swinging: not a hinge issue; this is a different hardware system entirely.

Try Adjusting Before Replacing

How to Adjust a Concealed Cup Hinge

1. Open the door and locate the hinge's mounting plate on the cabinet frame side. Look for two or three small screws, each controlling a different axis of movement.
2. The depth screw (usually closest to the door) adjusts how far in or out the door sits relative to the cabinet frame. Turn it to fix a door that sticks out too far or sits too far in.
3. The height screw (running vertically) raises or lowers the door slightly. Use this to fix a door that is higher or lower than an adjacent door.
4. The side-to-side screw adjusts the gap between the door and the cabinet frame or adjacent door. Use this to even out an uneven gap.
5. Make small adjustments, a quarter turn at a time, and close the door to check progress after each adjustment before continuing.

If adjustment alone does not fix a sagging door, and the hinge feels loose or the spring no longer holds the door open or closed with proper tension, replacement is the next step.

Matching Bore Size Before You Buy a Replacement

Overlay Type Also Matters

Beyond bore size, concealed hinges are made for a specific overlay, meaning how much the door covers the cabinet frame edge. The three common types are full overlay (door mostly covers the frame, typical on modern frameless vanities), half overlay (used when two doors share one frame opening), and inset (door sits flush within the frame, using a different hinge style entirely). Buying a full-overlay hinge for a half-overlay application, or vice versa, results in a door that either binds against its neighbor or leaves an oversized gap.

Step-by-Step: Replacing a Concealed Cup Hinge

1. Support the door (a helper or a soft wedge underneath works well) and remove the screws holding the mounting plate to the cabinet frame.
2. Detach the hinge arm from the mounting plate, usually by releasing a small clip or lever built into the hinge, then set the door aside.
3. If the hinge cup itself is failing and needs replacing (not just the arm), remove the two small screws holding the cup inside the door's bore and lift it out.
4. Install the new cup into the existing bore using the same screw holes if they are not stripped, or offset slightly and use fresh screw locations if they are.
5. Reattach the arm to the mounting plate on the cabinet frame, then support the door while clipping the hinge arm back onto the mounting plate.
6. Test the door through a full range of motion, then fine-tune with the depth, height, and side adjustment screws until it sits flush and even.

Step-by-Step: Replacing an Exposed Hinge

1. Support the door and remove the screws from both the door-side and frame-side leaves of the hinge.
2. Remove the old hinge completely and check whether the new hinge's screw holes align with the existing holes, since exact matches simplify the swap considerably.
3. If screw holes do not align or are stripped, fill them with a wood glue and toothpick or matchstick plug, let it set, and drill fresh pilot holes for the new hinge.
4. Mount the new hinge to the door first, then hold the door in position and secure the frame-side leaf.
5. Check the door swings freely and sits flush before fully tightening every screw.

What to Do About Stripped Screw Holes

Stripped screw holes are the most common complication in a hinge replacement, especially on particleboard or MDF cabinet frames where the original screws have been removed and reinstalled multiple times. Fill the stripped hole with a wood glue-coated toothpick or wooden matchstick, let the glue set for several minutes, then reinsert the screw into the same spot for a fresh grip. For a hole that is too far gone to hold even with this method, relocate the mounting plate slightly and drill a new pilot hole in solid material nearby, understanding this may require a small adjustment to the hinge's alignment afterward.

When a Hinge Failure Points to a Bigger Cabinet Problem

If the frame shows swelling consistent with water exposure, see our guide on bathroom vanity water damage repair to determine whether that section needs replacing before the new hinge goes in. If the swelling is concentrated at the cabinet base rather than at the hinge itself, our guide to bathroom vanity cabinet swelling causes and fixes covers tracing that separately.

Maintaining Hinges After Replacement

• Apply a small amount of dry lubricant to the pivot point once or twice a year to prevent squeaking and reduce wear on the spring mechanism.
• Avoid overtightening mounting screws during installation, since this can crack the plastic housing on some concealed hinge cups.
• Check adjustment screws periodically, especially after seasonal humidity changes, since wood movement can shift a previously well-aligned door slightly.
• If a vanity door feels heavy for its size, consider whether an upgraded hinge rated for higher weight capacity is a better long-term fit than a standard-duty replacement.