A hole in your ceiling needs patching properly — not just covering. This guide walks through the practical steps for patching small, medium, and large holes in a plasterboard ceiling, and when the right answer is calling a professional.
First — assess the cause
Before patching, find out why there's a hole. A few common causes:
- Removed fixture — old downlight, smoke alarm, fan, or vent. Simple to patch.
- Doorknob impact — door opened too hard and the knob punched through. Simple to patch.
- Foot through the ceiling — someone in the roof space stepped between the joists. Patchable, but check structural integrity around the hole.
- Water damage breakthrough — water-damaged board has failed and dropped. Don't just patch — fix the water source first, then assess whether wider replacement is needed.
- Falling sagging ceiling — pieces of a sagging ceiling have detached. Don't patch — the whole ceiling needs replacement.
How to patch a small hole (less than 50mm)
Small holes — say from a removed fastener, hook, or junction box — patch fast and clean.
What you'll need
- Filler (flexible setting compound, not rigid putty).
- Putty knife.
- Sandpaper (medium 120, fine 240).
- Paintable primer.
- Ceiling paint to match.
Process
- Scrape out any loose material around the hole.
- Apply filler with the putty knife, pressing into the hole and feathering edges flat.
- Let dry per manufacturer instructions — usually 24 hours for a deeper fill.
- Sand smooth with medium then fine sandpaper.
- Prime with paintable primer.
- Paint to match — usually two coats.
How to repair a hole in the ceiling (50–150mm)
Medium holes need a plasterboard patch, not just filler. Filler alone in a 100mm hole sags out and cracks within months.
The "California patch" technique
A clean, durable patch method for medium holes:
- Cut a square or rectangular piece of plasterboard, 25–30mm larger than the hole on each side.
- Score the back of the patch — through the paper backing but not through the gypsum core — defining a piece that matches the hole exactly.
- Snap and remove the gypsum from outside your hole-sized centre, leaving a "flap" of paper extending past the gypsum core on all four sides.
- Apply setting compound to the back of the paper flap.
- Push the patch into the hole — the gypsum core fits the hole, the paper flap sits flat against the ceiling around the hole, bonded by the setting compound.
- Once dry, apply two more coats of compound over the patch, feathering well past the patch edges each time.
- Sand smooth, prime, paint.
Done correctly, a California patch is invisible under paint and lasts as long as the rest of the ceiling.
Larger holes (150mm+)
For holes bigger than around 150mm, the right approach is cutting back to ceiling joists and installing a properly-fixed plasterboard section.
Process
- Cut the damaged area back to a clean rectangle, aligning two opposite sides with the centres of ceiling joists above.
- Install a backing batten on each cut edge to support the new piece.
- Cut new plasterboard to fit the rectangle.
- Screw-fix to joists and battens.
- Tape and three-coat set the perimeter joints.
- Sand to a paint-ready finish.
- Prime and paint.
Water-damaged holes
If the hole is from water damage, don't just patch it. The plasterboard around the hole has almost certainly absorbed moisture too — it might look intact today but it's weakened and will fail in months.
The right approach: identify and fix the water source first, let the area dry fully, then assess the extent. Often the proper repair is removal back to sound material — which may be a wider area than the visible hole suggests.
When to call a professional
- The hole is the result of a sagging or partly collapsed ceiling.
- You see water damage, mould, or soft spots around the hole.
- The hole is on a high or angled ceiling you can't safely reach.
- You've patched and it keeps cracking or showing.
- You want a finish that's actually invisible under raking light.
Tools to have on hand for ceiling patching
- Step ladder or scaffold rated for the height.
- Dust mask and safety glasses.
- Drop sheets — ceiling repair is messy.
- Pencil for marking, tape measure.
- Sharp utility knife.
- Plasterboard offcut for patch material.
- Putty knives in 50mm and 150mm widths.
- Setting compound (premixed for small jobs is easier).
- Paper or mesh tape.
- Sandpaper grades 120 and 240.
- Paintable primer and ceiling paint.
Frequently asked
No. Filler sags out of larger holes and cracks within months. You need a plasterboard patch backed properly.
For most lighting conditions, yes — if the set is feathered properly. Under harsh raking light at low sun angles, even a good patch can show slightly.
Including drying time, a medium patch takes 2–3 days from start to painted finish. Active work time is a few hours.
Yes. Setting compound absorbs paint differently from the surrounding surface. Primer evens out the absorption so the finished paint looks uniform.
Ideally, but even matching paints can read slightly differently due to age, dust, and UV. For best results, paint the whole ceiling — or at least the whole affected zone — rather than just the patch.
Need this work done in Perth?
Gyprock Repairs — specialist team by Ryan Chapman, fully insured, with a written 12-Month Warranty.
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