How to Build and Hang Cabinet Doors: A Complete Fitting Guide

Updating or building custom fronts for existing cupboards is one of the most cost-effective ways to refresh a kitchen, bedroom, or utility room. Understanding how to build cabinet doors properly comes down to precise measurement, accurate drilling for hardware, and choosing the correct concealed hinges to ensure smooth operation.

1. Measuring and Sizing Your Cabinet Doors

Before cutting any board or ordering timber, you must determine whether your cabinets use full overlay, half overlay, or inset doors. The vast majority of modern British modular units rely on full overlay hinges, where the door covers almost the entire front edge of the 18mm carcass side.

• Full Overlay: Deduct 3mm to 4mm from the total external height and width of the carcass opening. This provides a standard 2mm expansion gap around all edges to prevent rubbing.
• Twin Doors (Pair): Measure the total width, subtract 6mm (allowing 2mm at each outer edge and 2mm between the doors), then divide by two.
• Inset Doors: Measure the internal opening precisely and subtract 4mm from both height and width to maintain an even 2mm reveal all the way around.

2. Material Selection and Cutting

When learning how to build cabinet doors, sheet materials such as moisture-resistant MDF (MR-MDF) or veneered ply offer the best stability. Solid timber looks fantastic but requires traditional rail-and-stile joinery to prevent warping across the grain over time.

Cut your panels using a guide rail and circular saw to ensure edges are square. Sand all edges thoroughly, seal them, and apply your primer and topcoat before installing any metal hardware. Fitting hardware to freshly finished panels prevents paint build-up in hinge cups and screw holes.

3. Drilling 35mm Concealed Hinge Cups

Concealed European-style hinges require a 35mm circular pocket (the hinge cup) drilled into the rear face of the door. The precision of these holes dictates how well the door will hang.

1. Mark the Height: Standard practice is to mark the centre of the hinge cup 100mm from the top and bottom edges of the door. For taller pantry doors, add a third hinge in the centre, or closer to the top hinge to support extra weight.
2. Set the Backset (Edge Distance): For standard full overlay hinges, the edge of the 35mm hole is typically 4mm to 5mm from the door edge (making the centre point 21.5mm to 22.5mm in from the edge). Always check the specification sheet for your chosen hinge.
3. Drill to Depth: Use a sharp 35mm Forstner bit in a pillar drill or with a drill guide. Most hinge cups require a depth of 11.5mm to 12.5mm. Take care not to drill straight through the face of an 18mm door panel.

4. Mounting Plates and Hanging the Door

Concealed hinges attach to the carcass via mounting plates. On standard 32mm system carcasses, mounting plates line up with pre-drilled system holes set 37mm back from the front edge of the cabinet side.

If you are retrofitting into an un-drilled carcass, measure carefully from the top and bottom internal edges so your mounting plates mirror the positions of the hinges on the door. Fasten the mounting plates using wood screws or Euro screws, clip or screw the hinge arms into the plates, and test the swing.

5. Adjusting Hinges and Fitting Handles

Once hung, modern concealed hinges provide three-way adjustment via integrated screws on the hinge arm:

To finish the installation, measure and drill for your cabinet handles. Always use a scrap piece of wood clamped tightly to the front face when drilling through to eliminate breakout on the decorative side.