How to Patch a Hole in Plasterboard

2026 Guide

Fix a damaged wall cleanly and invisibly — no plasterer required.

Quick Answer

To patch a hole in plasterboard, cut the damaged area square, fit a backing patch or repair plate, cut a matching piece of plasterboard, screw it in place, apply joint compound in thin coats, sand smooth, then prime and paint. Most repairs take two to three hours.

Before

After

Difficulty

Beginner

Time

2–3 Hours

Cost

£15–£30

Tools Needed

Padsaw or plasterboard saw
Utility knife
Screwdriver or cordless drill
Plasterer’s trowel or broad knife
Sanding block
Tape measure and pencil

Materials

Plasterboard offcut (matching thickness)
Plasterboard repair plate or timber batten
Plasterboard screws
Joint compound or finishing plaster
Fibreglass mesh tape or paper jointing tape
Fine sandpaper (120 grit)
Plasterboard primer or PVA diluted solution
Emulsion paint to match

How To

Step-by-Step Guide

Mark and cut a clean square around the damage

Use a tape measure and pencil to draw a neat rectangle around the hole, then cut along the lines with a padsaw. A clean, straight-edged opening is far easier to patch accurately than a ragged irregular hole — this step determines how invisible the finished repair looks.

Fit a backing support behind the opening

For holes up to roughly 150 mm, a proprietary repair plate works well — slot it through the opening and tighten the wings behind the board. For larger holes, cut two timber battens slightly longer than the opening, insert them vertically behind each side edge, and screw through the existing plasterboard to hold them firm. The backing gives the patch something solid to fix to.

Cut and fit the plasterboard patch

Cut a piece of plasterboard offcut to match the opening exactly, using a utility knife scored deeply and then snapped cleanly. Fit the patch into the opening and drive plasterboard screws through it into the backing at roughly 150 mm intervals — countersink the screws just below the surface without tearing the paper face.

Tape the joints and apply the first coat of compound

Bed fibreglass mesh tape or paper jointing tape over all four joints, pressing it flat with a broad knife. Apply a thin, even coat of joint compound over the tape and across the screw heads, feathering the edges outward at least 75 mm beyond each joint. Thin coats dry without cracking — resist the urge to build it up in one pass.

Sand, prime, and apply finishing coats

Once the first coat is fully dry (typically two to four hours), lightly sand with 120-grit paper, wipe away dust, and apply a second thin coat, feathering wider than the first. Repeat if necessary until the surface is flush. Sand smooth, then apply a coat of plasterboard primer or diluted PVA to seal the compound before painting — skipping this step causes paint to absorb unevenly and highlights the repair.

Paint to match the surrounding wall

Once the primer is dry, apply two coats of emulsion in the existing wall colour, blending slightly beyond the repair area. If the wall colour has aged or faded, painting a full wall section rather than spot-painting produces a cleaner match.

Watch Out

Common Mistakes to Avoid

How long does plasterboard joint compound take to dry?

Standard joint compound dries in two to four hours under normal conditions, but allow it to dry fully between coats — rushing this step is the single most common cause of cracking.

Do I need to use mesh tape or paper tape?

Both work. Fibreglass mesh tape is easier to apply and self-adhesive, but paper tape bonded into compound is stronger and less prone to cracking on larger repairs — either is fine for standard patches.

Can I use filler instead of joint compound on a plasterboard patch?

Will the patch show through paint once finished?

A properly feathered and primed repair should be invisible under flat emulsion. Sheen or silk finishes are less forgiving — if you are using a sheen paint, take extra care feathering compound well beyond the repair edges and consider lightly sanding the surrounding wall to blend the surface texture.

Pro Tip

Before applying your final coat of compound, hold a work light at a very low angle to the wall — raking light reveals any ridges or hollows that normal overhead lighting hides completely. Fix them at the compound stage, not after you’ve painted.

Sources

HSE — Plastering and associated trades: health and safety guidance — hse.gov.uk
Which? — How to repair plasterboard — which.co.uk
GOV.UK — Building regulations: walls and ceilings — gov.uk

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This guide is for general information only. Always work safely and follow manufacturer instructions. DIYnut accepts no liability for injury or damage arising from DIY work.

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