How to Install an Internal Door: Complete DIY Guide

Price Cart UK
2026-03-14T11:34:45+00:00

Learning how to install an internal door is a rewarding DIY project that can save you hundreds of pounds in fitting costs. With the right tools and this step-by-step guide, you can hang a new door in just a few hours.

Tools You Will Need

Tape measure

Pencil

Spirit level

Saw (circular or hand saw)

Wood plane or electric planer

Chisel set

Hammer or mallet

Drill with wood bits

Screwdriver

Workbench or sawhorses

Materials Required

Internal door

3x door hinges (76mm recommended)

Door latch

Door handles

Wood screws

Wood filler (optional)

Step-by-Step Installation Guide

Step 1: Measure the Door Opening

Measure the height and width of your door frame at multiple points. The door should be 2-3mm smaller than the opening on all sides for clearance.

Step 2: Mark and Cut the Door

If your door needs trimming, mark your cut lines with a pencil and straight edge. Score along the line with a sharp knife to prevent splintering, then cut with a saw.

Important: Most doors can only be trimmed by 10-15mm. Check manufacturer guidelines before cutting.

Step 3: Mark Hinge Positions

Standard hinge positions are:

Top hinge: 150mm from the top

Bottom hinge: 225mm from the bottom

Middle hinge: Centred between top and bottom (recommended for heavier doors)

Step 4: Cut Hinge Recesses

Use a chisel to cut recesses for the hinges on both the door edge and frame. The hinge should sit flush with the wood surface.

Step 5: Attach Hinges to Door

Fix the hinges to the door first using the screws provided. Pre-drill pilot holes to prevent splitting.

Step 6: Hang the Door

With help, hold the door in position and mark the hinge positions on the frame. Cut recesses, then attach the other side of each hinge to the frame.

Step 7: Check and Adjust

Open and close the door several times. Use a plane to trim any areas that stick. The door should have even gaps all around.

Step 8: Install Latch and Handles

Mark and drill the holes for your latch and handles. Follow the manufacturer instructions for correct positioning.

Pro Tips

Work with the door on its side when marking and cutting

Always use 3 hinges for solid or heavy doors

Leave a 10mm gap at the bottom for carpeted floors

Apply a coat of primer to cut edges to prevent moisture absorption

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