How to Repair Cracks and Holes in Plasterboard Ceilings?

A crack or hole in a plasterboard ceiling is one of the more satisfying DIY repairs to get right. This guide covers the right approach for every type of plasterboard ceiling damage, hairline cracks, larger cracks, small holes, and fist-sized holes that need a full patch, along with when to call a plasterer rather than attempt it yourself.

Table of contents

1. Diagnosing the Damage: What Approach Does Your Repair Need?
2. Tools and Materials You'll Need
3. How to Repair a Hairline Crack in a Plasterboard Ceiling
4. How to Repair a Larger Crack with Joint Tape
5. How to Repair a Small Hole in Plasterboard
6. How to Repair a Large Hole in Plasterboard
7. How to Use Plasterboard Repair Patches
8. How to Skim Coat After a Repair
9. When to Call a Plasterer
10. How to Find a Plasterer for Ceiling Repair
11. FAQs: Plasterboard Ceiling Repairs

The size and type of the damage determines the method. The diagnosis section matches damage to approach so you're not over-engineering a small fix or under-preparing for a larger one.

Diagnosing the Damage: What Approach Does Your Repair Need?

Before selecting tools or materials, spend a couple of minutes establishing what you're actually dealing with. The type and cause of the damage determines both the method and the likelihood of the repair holding long-term.

Hairline cracks (under 2mm wide) in otherwise sound plasterboard are usually caused by normal thermal movement, minor vibration, or minor settling. These are surface-only issues and can be filled directly without reinforcement.

Larger cracks (2mm and above) - particularly those that follow the line of the plasterboard joints beneath - are often caused by the jointing tape or filler between boards failing. Filling over the top without reinforcing the joint will crack again. These need tape and compound.

Cracks following a specific pattern (spiderweb, branching, or running from corners of openings) can indicate structural movement. If the crack has appeared recently, is growing, or is accompanied by other signs of movement (sticking doors, sloping floors), get a structural assessment before any cosmetic repair.

Small holes (up to approximately 75mm) - from screws, hooks, light fittings, or minor impacts - can be filled or backed and filled without cutting out any board.

Larger holes (75mm and above) need a proper patch because most fillers lack the structural depth to bridge a large void without cracking or sinking. A patch repair — either using proprietary repair patches or cutting out to a support bracket — gives the repair a solid base.

Check the ceiling above first. If the damage might be related to a water leak - staining around the crack or hole, or a damp smell - trace and fix the source before repairing the ceiling. See our guide to water stains on ceilings for how to investigate and address water damage before starting any plasterboard repair.

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Tools and Materials You'll Need

Getting everything together before you start matters more for ceiling repairs than most jobs - once filler or compound is mixed and applied, you're working against the clock before it begins to set.

Having to stop and look for a tool mid-repair is how finishes get ruined. The materials needed depend on the repair type, but the basic toolkit is similar across all approaches.

For hairline cracks and small holes:

• Flexible decorator's filler (tube or tub) - pre-mixed, paintable, flexible when dry
• Fine-grit sandpaper (120 grit)
• Damp cloth for cleaning the area
• Putty knife or filling knife

For larger cracks and tape repairs:

• Jointing compound (setting-type for the first coat; all-purpose for finishing)
• Paper jointing tape or fibreglass mesh tape
• Wide filling knife or skimming trowel (150–200mm)
• Sandpaper (80 grit then 120 grit)

For holes:

• Plasterboard repair patches (for small to medium holes) - sold in kits at DIY stores
• Or: new plasterboard off-cut, timber noggins or metal repair clips, plasterboard screws
• Jointing compound
• Mesh tape
• Skim finish plaster

For all repairs:

• Dust sheets - ceiling dust travels further than wall dust
• Safety goggles - working overhead
• Step ladder of the right height - do not work from a chair or improvised platform

How to Repair a Hairline Crack in a Plasterboard Ceiling

A hairline crack in otherwise sound plasterboard is the simplest ceiling repair. The key is surface preparation and using the right filler, one that stays flexible rather than setting rigid, which is more likely to crack again with further movement.

Step 1: Open the crack slightly.

Run the edge of a filling knife along the crack to open it slightly into a V-profile. This sounds counterintuitive but gives the filler more surface area to bond to. A crack filled flush to its surface edges often pops back out as a visible line. Use a vacuum or damp cloth to remove all dust from the opened crack.

Step 2: Apply flexible filler.

Using a filling knife, press flexible decorator's filler firmly into the crack and draw the knife across to leave the surface slightly proud. Work in short sections. Allow to dry fully, typically 2–4 hours for thin applications.

Step 3: Sand and apply a second coat if needed.

Sand lightly with 120-grit paper when fully dry. Filler often shrinks slightly as it dries, leaving a shallow dip. A second thin coat fills this. Sand again once dry to a smooth, flush surface.

Step 4: Prime and paint.

New filler is more absorbent than surrounding painted surfaces, a spot primer or diluted first coat ensures the painted finish is even rather than showing a dull patch where the filler sits.

How to Repair a Larger Crack with Joint Tape

Larger cracks, particularly those running along plasterboard joints, need reinforcing with tape before filling, otherwise the repair cracks again as the underlying board continues to move slightly.

Step 1: Prepare the surface.

Remove any loose filler, flaking paint, or debris from around the crack. Widen the crack slightly with a filling knife if needed and vacuum clean.

Step 2: Apply a thin bed coat of jointing compound.

Apply a thin layer of jointing compound along and either side of the crack, approximately 50–75mm either side. This gives the tape something to bed into.

Step 3: Bed the tape.

Press fibreglass mesh tape (or paper tape, both work, though mesh is more forgiving for beginners) into the wet compound along the crack, pressing it flat with your knife. Avoid wrinkles or bubbles in the tape, these show through the final finish.

Step 4: Apply the first coat over the tape.

Cover the tape with a full coat of jointing compound, feathering the edges outward to blend into the surrounding ceiling. Allow to dry fully before the next coat.

Step 5: Apply a second (and possibly third) coat.

Each coat should be wider and thinner than the last, feathering the edges to create an imperceptible transition to the surrounding surface. Sand lightly between coats once dry.

Step 6: Skim and finish.

Once the compound is fully dry, a thin skim coat of finishing plaster over the repair (see the skim coat section below) produces the flattest and most invisible result. Alternatively, sand to a smooth finish with 80 grit then 120 grit, prime, and paint.

How to Repair a Small Hole in Plasterboard

Small holes, from screws, hooks, or minor impacts, are straightforward to fill provided the surrounding plasterboard is sound and the hole doesn't extend all the way through to open space above.

For holes under approximately 25mm:

A direct fill with pre-mixed filler or patching compound is sufficient. Apply with a filling knife, press firmly to fill the hole completely, and draw the knife flat across the surface to leave it slightly proud. Allow to dry, sand flush, and apply a second coat if any shrinkage is visible.

For holes up to approximately 75mm:

Holes of this size need some form of backing to prevent the filler from sinking or cracking into the void. Options include:

• Crumpling a small piece of damp newspaper and pushing it into the hole as a temporary backing, then filling over it
• Using fibreglass mesh patch tape applied over the hole (it bridges the gap and the compound bonds to the mesh)
• Using a proprietary repair patch kit (see the repair patches section)

Once backed, build up the fill in thin layers rather than one deep application - thick filler is more prone to cracking as it dries.

How to Repair a Large Hole in Plasterboard

Large holes, from door handles, structural access, removed light fittings, or damage, need a proper patch with a solid backing support. Attempting to fill a large void with filler alone will result in sinking, cracking, and a visible repair.

Method 1 - Cut to timber supports:

• Step 1: Cut the damaged area back to a clean rectangle or square using a plasterboard saw. Make the cuts to the nearest available joists or noggings so the new patch has solid fixing points at its edges.

• Step 2: If the cut doesn't reach joists on all sides, fit timber noggings, short pieces of 50×50mm timber fitted between joists at the cut edges, secured with timber screws from above if the loft is accessible, or from the side if not.

• Step 3: Cut a new piece of plasterboard to fit the opening precisely. Fix to the joists and noggings with plasterboard screws at 150mm centres.

• Step 4: Tape the joins between the new patch and the existing ceiling with jointing tape and compound, following the larger crack method above.

Method 2 - Metal repair clips:

Proprietary metal repair clips are inserted through the hole and clipped to the back of the existing board, creating a fixing point for a new patch without needing to access the joists above. These work well for medium-sized holes and are considerably easier than cutting to joists in an inaccessible ceiling.

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How to Use Plasterboard Repair Patches

Plasterboard repair patch kits are available from most DIY stores and are specifically designed for holes up to approximately 1500200mm. They provide a quick solution that bridges the hole without cutting back to joists, useful for accessible single-skin plasterboard ceilings.

Most kits include a mesh or metal patch that sticks to the existing ceiling, bridging the hole, and jointing compound to fill and finish over the patch.

• Step 1: Clean and dry the area around the hole and remove any loose material.

• Step 2: Peel the backing from the adhesive patch and press firmly over the hole, centring it. Smooth out any bubbles.

• Step 3: Apply jointing compound over the patch, feathering the edges outward 75-100mm. Allow to dry.

• Step 4: Apply a second coat, wider than the first, and feather further. Repeat if needed until the surface is flush with the surrounding ceiling.

• Step 5: Sand smooth once dry, prime, and paint.

Note: Repair patches are designed for single-skin plasterboard and work well on ceilings with solid plasterboard above. They're not suitable for hollow partitions or ceilings where the patch needs to support any weight.

How to Skim Coat After a Repair

For a truly invisible repair, particularly on a ceiling where raking light from a window will show any imperfection, a thin skim coat of finishing plaster over the repaired area is the best final step.

Once jointing compound is fully dry and sanded smooth, apply a thin skim of finish plaster (Thistle Multi-Finish or similar) over the repaired area. Work it flat with a plastering trowel, feathering the edges into the surrounding ceiling. As the skim begins to stiffen (10–20 minutes), tighten it with a damp trowel in overlapping passes.

The skim must be thin - 2-3mm maximum. Too thick and it will crack.

Allow to dry fully (typically 3-5 days for a ceiling), apply a mist coat of diluted emulsion, then top coat. See our guide to replastering for more detail on skim coat technique and drying times.

When to Call a Plasterer

Ceiling repairs are unforgiving - small imperfections that would be invisible on a wall become obvious on a horizontal surface in natural light. There are specific situations where a professional plasterer is the right call.

When the damage is extensive.

A ceiling with multiple large holes, widespread crack networks, or significant areas of blown plasterboard is more efficiently and better addressed by a plasterer who can carry out the full repair in a single session.

When the ceiling has a skim finish.

If the existing ceiling has a smooth skim rather than bare plasterboard, achieving an invisible join between a local repair and the existing skim is very difficult. A plasterer can re-skim the full ceiling face for a uniform result.

When cracks indicate possible structural movement.

If the crack pattern suggests something other than normal thermal movement - running from load-bearing points, following structural junctions, or appearing suddenly alongside other symptoms - get the structure assessed before any cosmetic repair.

When working overhead is a limitation.

Ceiling work overhead is physically demanding and requires a stable, properly elevated working platform. If you don't have appropriate access equipment, professional work is safer.

See the MyBuilder plastering cost guide for typical repair and replastering costs, and the ceiling plastering cost guide for ceiling-specific pricing.

Find a Plasterer for Ceiling Repair on MyBuilder

You can find and compare available plasterers near you on MyBuilder. Post your job with details of the size and location of the damage - plasterers in your area will respond with their approach and quotes.

All tradespeople on MyBuilder undergo checks at registration - such as ID documents, company details, certifications for regulated jobs and skill assessments - allowing you to hire with confidence.

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FAQs: Plasterboard Ceiling Repairs

Why Does My Ceiling Filler Keep Cracking?

Filler cracks for three main reasons: the crack it was filling is still moving (thermal movement or structural), the filler was applied too thickly in one coat (thick filler cracks as it dries), or the wrong type of filler was used (rigid filler on a joint that moves slightly).

For recurring cracks on plasterboard joints, tape the joint before filling rather than attempting to fill it directly.

Can I Paint Over a Ceiling Repair Straight Away?

Wait until the filler or compound is fully dry - typically 2-4 hours for thin applications of pre-mixed filler, up to several days for jointing compound.

New filler is more absorbent than painted plasterboard around it; apply a spot primer or diluted first coat (mist coat) over the repair before top coating, otherwise the repaired area will look different to the surrounding ceiling through the final paint.

How Do I Repair a Ceiling After a Water Leak?

Fix the source of the leak and allow the ceiling to dry fully before any repair. See our guide to water stains on ceilings for how to identify the source, dry out the ceiling, and apply stain-blocking primer before redecorating. Attempting to fill or skim a ceiling that's still damp produces a repair that will fail quickly, the drying timeline is the constraint, not the technical difficulty of the repair itself.

Can I Use Normal Filler to Repair a Large Hole in the Ceiling?

Not effectively. Standard pre-mixed filler used to fill a large void (anything over about 25mm) shrinks significantly as it dries, sinks into the void, and cracks. It also has no structural strength when dried unsupported in a large hole.

For holes above 25mm, use the mesh tape, repair patch, or cut-and-fill methods covered in this guide. You can browse completed plastering and ceiling repair projects on MyBuilder to see what professional results look like.

Do I Need a Permit to Repair Plasterboard?

No. Plasterboard repairs are standard cosmetic maintenance work and don't require any permits, building control notifications, or planning applications. The exception is if the repair is part of structural work, for example, if a hole was cut to access pipework or structural members that were then modified, in which case the structural work may need building control sign-off, but the cosmetic ceiling repair itself does not.