Plasterboard is a useful material for both DIY jobs and large-scale projects.

But for the DIY user knowing how to cut plasterboard, how to fix plasterboard and how to get rid of excess plasterboard can be a challenge.

Luckily, at Insulation Superstore we’re here to help!

Read on to learn how to cut plasterboard for a variety of uses and make sure you know how to dispose of offcuts properly.

Table of contents:

How to cut plasterboard step by step

Plasterboard is commonly used in interior construction projects for walls and ceilings, providing a smooth, durable surface for painting or wallpapering. It’s also great for soundproofing and insulation applications due to its ability to be layered and filled with insulating materials.

While you can use an ordinary saw when cutting plasterboard, a saw with fine teeth would be best to ensure a clean cut. Sawing plasterboard is the best way to cut the product, but be prepared for the chosen tool to get blunt and have a spare to hand!

How to cut a straight line in plasterboard

Man cutting a plasterboard with a saw.

Step 1: Measure and mark

Measure the cut you need to make by working out where you need the line and drawing a rough guide with a pencil

Step 2: Secure spirit level

Hold a spirit level over the pencil marking on the plasterboard and push it down firmly so it stays in place

Step 3: Score the plasterboard

Use this straight line to cut a shallow mark into the plasterboard with a Stanley knife or something similar

Step 4: Cut through

Use this as a guideline and cut the plasterboard all the way through with a saw. Check the progress of the cut regularly to ensure it’s staying where you’ve marked out.

And that’s all it takes! But wait – we’re not quite done yet.

How to cut a hole in plasterboard

Fire-resistant plasterboard

Step 1: Measure and mark

Measure the cut you need to make as accurately as you can. Mark out the cut with a pencil.

Step 2: Create starting point

Use a plasterboard hammer to bang 50mm inside one of the cut lines (this line will let you insert the blade of the saw to begin the cut so it’s a crucial step)

Step 3: Insert saw blade and cut

Insert the saw into the 50mm deep line and carefully start cutting through the plasterboard using the saw, following the marked cut line for accuracy. Check the progress of the cut regularly to ensure it’s staying where you’ve marked out.


How to dispose of plasterboard

Even though plasterboard is classed as non-hazardous waste, it cannot be accepted at landfill sites due to the gypsum inside. That’s because gypsum reacts with bio-degradable products to emit a toxic gas.

For large projects, you can get plasterboard-only skips and waste bags where all offcuts can go. If you’re working on a small project at home, you should contact a local waste collection or recycling company. Many of these companies will offer to collect plasterboard, or you could take it to them.


Be sure to check in advance where you can dispose of excess plasterboard in your area, and always choose the option to recycle if you can.

You can find out more about the various types of plasterboard in our in-depth guide.

If you have several sheets of plasterboard left over, why not donate them, put them on a local selling site or offer them for a DIY project to your friends?

Final thoughts

Cutting plasterboard is generally not difficult, but it requires some care and attention to ensure clean, accurate cuts.

Make sure you use the proper tools and techniques to avoid creating jagged edges or damaging the surrounding area. With proper preparation and caution, cutting plasterboard can be done effectively and safely.

And now that you know how to cut plasterboard like a pro, you’re all set to use it various small and large home improvement projects.

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