Finished internal door hung in an old frame with level, plane, chisel and HIP Toolbox style tools nearby

How to Hang a New Internal Door in an Old Frame

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Finished internal door hung in an old frame with level, plane, chisel and HIP Toolbox style tools nearby

Replacing an internal door sounds simple until the frame tells the truth. Older frames are often slightly twisted, out of square, painted over many times or worn around the hinge positions. The safest route is to measure carefully, trim slowly and keep checking the actual opening.

Safety noteWear eye protection and a dust mask when cutting, sanding or planing. Support the door properly on trestles or padded blocks. If the frame is structural, damaged, rotten, part of a fire-door setup or part of a rented/shared property requirement, get suitable advice before altering it.

Tools

  • Tape measure, pencil, masking tape and straight edge
  • Long level, square, wedges and clamps
  • Plane, sharp chisels and mallet
  • Drill, pilot bits and screwdriver bits
  • Saw with guide if larger trimming is needed

Materials

  • Internal door sized for the opening
  • Hinges, screws, handle and latch set
  • Wood filler for old fixing holes if needed
  • Primer, paint or sealant for cut edges
  • Dust sheet and small timber offcuts for supports

1. Measure the Opening Before Cutting

Measuring an old internal door frame before fitting a new door

Measure the opening at the top, middle and bottom, then measure both sides for height. Check the frame with a long level and mark the hinge side and latch side on the door. Do not assume the frame is square, especially in older houses.

  • Use the old door only as a rough reference.
  • Check floor clearance for carpet, thresholds and door swing.
  • Mark cut lines lightly and clearly before removing any timber.

2. Trim Slowly and Test Fit Often

Trimming and planing a new internal door on trestles before fitting

Trim small amounts at a time, then offer the door back into the opening with wedges underneath. Aim for even practical gaps rather than a perfect theoretical measurement. It is much easier to remove a little more timber than to repair a cut that went too far.

3. Mark and Cut the Hinge Recesses

Chiselling hinge recesses into a new internal door before hanging

Transfer hinge positions from the frame to the door. Score around each hinge leaf with a sharp blade, then chisel gradually so the hinge sits flush. Drill pilot holes before fitting screws to reduce splitting and make adjustment easier.

4. Hang the Door, Then Fit the Latch

Finished internal door hung in an old frame with level, plane, chisel and HIP Toolbox style tools nearby

Hang the door on the hinges and check the swing before fitting the latch and handle. If the door rubs, mark the contact point with pencil and remove only a small amount. Once the fit is right, seal or paint any freshly cut timber edges so they do not absorb moisture unevenly.

Open the checklist builder | Estimate fixings | Plan the budget

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