Pipe Cutters: Types, Technique, and What to Buy for Copper and Plastic
The UK guide to pipe cutters for extension plumbing. Copper vs plastic types, proper cutting technique, deburring, common mistakes, and what to buy from £5-35.
You've measured and marked your copper pipe. You reach for the hacksaw, clamp the pipe in a vice, and start sawing. The blade wanders. The cut comes out angled. You file it flat, push the pipe into the fitting, and the compression olive won't seat properly because the end isn't square. Water test, drip, tighten, still drips. A pipe cutter would have given you a clean, square cut in ten seconds. It costs less than a takeaway.
What it is and when you need one
A pipe cutter is a small handheld tool that scores a groove around a pipe and cuts through it by rotating. You place the cutter around the pipe, tighten it so the cutting wheel bites into the surface, and spin the tool around the pipe. Each rotation deepens the cut until the pipe separates cleanly.
The result is a square, burr-free cut (or close to it) that slots straight into compression fittings, push-fit connections, or soldered joints without filing or fettling. That's why plumbers use them instead of hacksaws for almost every cut. A hacksaw can cut pipe, but the finish is rougher, the cut is rarely perfectly square, and the edges need more work before you can make a joint.
On any extension or renovation project, you'll cut pipe constantly during plumbing work. Every radiator connection, every tap feed, every waste pipe run under the floor needs pipes cut to length. A 15mm and 22mm copper pipe cutter will handle all standard domestic hot water, cold water, and central heating pipework. A separate plastic pipe cutter handles the push-fit barrier pipe and waste pipe.
Types of pipe cutter
There are four types you'll encounter for domestic plumbing. They're not interchangeable, and using the wrong one on the wrong pipe material is one of the most common beginner mistakes.
| Type | Pipe material | Size range | Best for | Price range |
|---|---|---|---|---|
| Fixed-size pipe slice (autocut) | Copper | One size per tool: 15mm, 22mm, or 28mm | Tight spaces, speed, beginners. Spring mechanism prevents over-tightening. | £5-25 per size |
| Adjustable wheel cutter | Copper | 3-28mm or 3-35mm (covers multiple sizes) | Occasional use, varied pipe sizes, workbench cutting | £5-50 depending on quality |
| Scissor/ratchet cutter (plastic) | Plastic pushfit pipe, barrier pipe | Up to 28-42mm depending on model | Speedfit, Hep2O, and other plastic pushfit systems | £8-15 |
| Rotary slice cutter (plastic waste) | Plastic waste pipe | 32-42mm | Kitchen and bathroom waste pipes | £18-30 |
Fixed-size pipe slice: the one to buy
This is what professional plumbers carry and what you should buy. It's a compact cylinder, usually zinc or aluminium, that clamps around a pipe of one specific diameter. You place it on the pipe and rotate. A spring-loaded cutting wheel does the rest, automatically applying the right pressure with each turn.
The pipe slice is beginner-proof. Because the spring controls the cutting pressure, you can't over-tighten the wheel (the number one cause of botched cuts with adjustable cutters). It's small enough to work in tight spots between joists, against walls, and inside cupboards where a hacksaw frame won't fit. A typical pipe slice needs about 60-70mm of clearance around the pipe to rotate.
The downside: you need one per pipe size. For a typical extension, that means a 15mm and a 22mm. If you're running 28mm central heating mains, you'll need that size too.
Adjustable wheel cutter
The traditional pipe cutter with a screw-down handle. You open the jaws, place the pipe between the cutting wheel and two guide rollers, tighten until the wheel touches, and rotate. After each full rotation, you tighten the screw a little more.
These cover a range of sizes with one tool, which sounds appealing. But they need more skill. Over-tighten the screw and you deform the pipe. Under-tighten and the wheel skates without cutting. For beginners, the fixed-size pipe slice is a safer bet. Keep an adjustable cutter for odd sizes outside the 15/22/28mm standard range.
Plastic pipe cutter: a separate tool entirely
This is critical. Do not use a copper pipe cutter on plastic pipe.
A copper rotary wheel cutter scores the outside surface of plastic pipe instead of cutting through it cleanly. Those score marks sit exactly where the O-ring seats inside a push-fit fitting. The result is a slow leak that may not show for days or weeks after the system is pressurised. Speedfit's own instructions state: do not use damaged or scored pipe. Buy a dedicated plastic pipe cutter.
Plastic pipe cutters for push-fit pipe (15-28mm barrier pipe, Speedfit, Hep2O) use a scissor or ratchet action with a curved blade. You squeeze the handles and the blade shears through the pipe. Clean, square, no scoring. They cost £8 – £15 and last years.
For larger plastic waste pipe (32mm and 40mm from sinks, baths, and showers), you need a rotary slice cutter designed for plastic. Ratchet-style cutters struggle with 40mm pipe because the jaw doesn't open wide enough or the blade can't generate enough force. A dedicated rotary slice like the Rothenberger Plasticut Pro handles 32-40mm waste pipe cleanly.
For 110mm soil pipe (the large pipe from your toilet), you're into specialist territory. A chain cutter or a hacksaw with a mitre box is the standard approach. Wrap a sheet of paper around the pipe, align the edges, and mark along the paper edge with a felt pen to get a square line. Chamfer the cut end with a file so it doesn't tear the rubber seal in the socket fitting.
How to use a pipe cutter properly
Cutting copper with a pipe slice
The technique is simple, which is the point.
Mark your cut length on the pipe with a pencil or felt-tip pen. Place the pipe slice over the pipe at the mark. The tool should feel like it clicks or grips into position. Rotate the slice around the pipe in one direction. Keep rotating. The spring mechanism increases cutting pressure automatically with each turn. After 8-15 rotations (depending on pipe wall thickness), the pipe separates.
That's it. No adjustment, no tightening, no judgement calls about pressure. This is why the pipe slice is the right tool for a homeowner.
Cutting copper with an adjustable wheel cutter
Open the jaws by turning the screw handle anti-clockwise. Place the pipe between the cutting wheel and the two guide rollers. Tighten the screw until the wheel just touches the pipe surface. You should feel slight resistance, nothing more.
Rotate the cutter around the pipe one full turn. The wheel scores a light line. Now tighten the screw a quarter turn. Rotate again. Another quarter turn. Rotate. Repeat this cycle until the pipe separates. On 15mm copper, this takes 6-10 full rotations.
The quarter-turn rule is the single most important technique. Beginners crank the screw down hard to speed things up. Don't. Each quarter turn deepens the cut by roughly 0.3-0.5mm. Forcing it deeper deforms the pipe into an oval or the distinctive three-lobed clover shape that won't accept any fitting. Patience costs nothing. A replacement length of pipe and two new fittings costs £5 – £10.
Deburring after cutting
A pipe slice leaves a very slight inward lip (burr) on the inside edge of the cut. An adjustable cutter leaves more burr, and a hacksaw leaves the most. This burr matters for two reasons: it restricts water flow slightly, and on compression fittings, it stops the olive seating squarely.
Most adjustable pipe cutters have a small triangular deburring blade that folds out from the body. Insert it into the pipe end and rotate two or three times. The blade shaves the burr flat.
If your cutter doesn't have a built-in reamer (pipe slices generally don't), use a half-round file. Insert the rounded side into the pipe, angle it against the inner edge, and rotate the pipe while pressing lightly. Five seconds cleans it up.
For soldered (capillary) joints, also clean the outside of the pipe with wire wool or fine emery cloth. Solder won't flow onto dirty or oxidised copper. The outside surface needs to be bright and shiny for about 20mm back from the cut end.
If you're cutting into a live system (altering existing pipework with residual water), push a ball of cotton wool into the pipe just past the cut line before you start. It catches the copper filings that would otherwise fall into the system. Retrieve it with a piece of hooked wire afterwards. Copper filings in a combi boiler heat exchanger are bad news.
How to check your pipe cutter is working
The cutting wheel
Hold the cutter up and look at the cutting wheel edge-on. It should be sharp, with a clean V-profile. If the edge looks rounded, flat, or has visible nicks, the wheel is dull. A dull wheel requires more pressure to cut, which means more pipe deformation. Replace the wheel before it causes problems.
Replacement wheels cost £3 – £8 depending on brand. Monument and Rothenberger both sell them. Keep a spare in your toolbox. A plumber doing a full first-fix will get through two or three wheels; a homeowner managing an extension will likely need one replacement over the whole project.
The rollers
On adjustable wheel cutters, the two guide rollers opposite the cutting wheel keep the pipe centred. If these rollers seize (common when flux or water contaminates them), the pipe won't rotate smoothly and the cut spirals instead of tracking in a straight line. Spin each roller with your finger. They should turn freely. A drop of light oil sorts most seized rollers.
The spiral test
If your finished cut shows a spiral groove instead of a single clean line around the pipe, something is wrong. Either the cutting wheel is dull, the rollers are seized, or you didn't keep the cutter aligned during rotation. A spiral cut means the pipe end won't be square, and the joint will leak.
What to buy
For copper pipe: the twin pack
The best value for an extension project is a 15mm + 22mm twin pack of fixed-size pipe slices. This covers the two standard UK domestic pipe sizes: 15mm for individual tap feeds, radiator connections, and branch runs; 22mm for main hot and cold feeds and longer heating runs.
Three brands dominate the UK market, all widely available at Screwfix, Toolstation, and plumbing merchants.
| Brand/Product | What you get | Price (2026) | Notes |
|---|---|---|---|
| Monument Autocut 15mm + 22mm twin pack | Two fixed-size pipe slices, zinc diecast body, made in UK | ~£28-30 | Slightly better blade quality than Rothenberger according to trade reviews. All-metal construction. The safe recommendation. |
| Bahco 306-PACK | Two fixed-size pipe slices (15mm + 22mm), titanium-coated blade | ~£28 | Excellent blade longevity from titanium coating. Well-regarded by plumbers. |
| Rothenberger PRO-Cut 15mm + 22mm twin pack | Two fixed-size pipe slices | ~£35 | The other big name. Reliable. Marginally more expensive for equivalent quality. |
| Wickes/Screwfix own-brand 15mm autocut | Single fixed-size pipe slice | ~£10 | Perfectly adequate for a single project. Won't last as long as Monument or Rothenberger but at this price, it doesn't need to. |
Pipe cutter twin pack (15mm + 22mm, named brand)
£28 – £35
If budget is tight, a single own-brand 15mm pipe slice at TBC from Wickes or Toolstation handles the most common cuts. Add a 22mm later if you need it.
For a mid-range single-size cutter from Monument, Rothenberger, or Bahco, expect to pay TBC per size.
If you need 28mm for central heating mains, buy that size individually. Monument Originals 28mm is the better choice here because it's all-metal construction, unlike the Rothenberger 28mm which uses a plastic body that some plumbers dislike. Expect to pay £24 – £40 for a 28mm cutter.
For plastic pipe
Buy a dedicated scissor or ratchet cutter for push-fit pipe. Wickes sells one for about £8 that handles up to 36mm. Toolstation and Screwfix stock similar from Faithfull, Todays Tools, and Magnusson in the £8 – £15 range. Any of these will do the job for the amount of plastic pipe cutting on a typical extension.
If you're running 40mm waste pipe (from a kitchen sink or bath), a rotary slice type like the Rothenberger Plasticut Pro (around £20 – £25) is worth the extra. Ratchet cutters at this diameter are reported as ineffective by multiple plumbers.
What you actually need for an extension
A complete pipe cutting kit for a kitchen extension costs £36 – £50:
- 15mm + 22mm copper pipe slice twin pack: TBC
- One plastic pipe cutter for Speedfit/barrier pipe: £8 – £15
- Total: roughly £36 – £50
That's it. You don't need the Milwaukee M12 cordless at £115 or the Knipex TubiX at £60. Those are professional tools for plumbers cutting pipe all day, every day.
Alternatives
A hacksaw cuts pipe. It's slower, the finish is rougher, and you'll spend more time deburring and filing. But it works, and sometimes it's the only option.
When a pipe runs tight against a wall or between joists with less than 50-60mm of clearance around it, a pipe slice can't rotate. A hacksaw (or junior hacksaw for very tight spots) is the correct tool here. Cut, deburr thoroughly, chamfer the edge, and the joint will be fine. This is a workaround, not a substitute for a cutter on open pipework.
See the hacksaw guide for blade selection and proper cutting technique on copper pipe.
Where you'll need this
- Drainage - cutting drainage pipes to length for fittings and junctions
- First fix plumbing - cutting copper and plastic pipes for hot water, cold water, and waste runs
- Underfloor heating - cutting UFH pipe loops to length at manifold connections
- Second fix plumbing - cutting final pipe lengths for taps, appliances, and radiator connections
Pipe cutters appear at every plumbing stage of any extension or renovation project. You'll reach for them during groundwork drainage, first-fix pipe runs, and again when connecting final fittings at second fix.
UK pipe sizes: quick reference
Understanding which pipes you're cutting helps you buy the right cutters.
| Pipe size | Material | What it's for | Cutter needed |
|---|---|---|---|
| 15mm | Copper | Individual tap feeds, radiator connections, short branch runs | 15mm copper pipe slice |
| 22mm | Copper | Main hot and cold feeds, longer heating runs | 22mm copper pipe slice |
| 28mm | Copper | Central heating main flow/return on larger systems | 28mm copper pipe slice (buy only if needed) |
| 15-22mm | Plastic barrier pipe | Push-fit alternative to copper (Speedfit, Hep2O) | Plastic scissor/ratchet cutter |
| 32mm | Plastic waste | Basin waste, overflow pipes | Plastic pipe cutter or hacksaw |
| 40mm | Plastic waste | Kitchen sink, bath, shower waste | Rotary slice plastic cutter |
| 110mm | Plastic soil pipe | WC connection, soil/vent stack | Chain cutter or hacksaw with mitre box |
Common mistakes
Using a copper cutter on plastic pipe. Covered above. The scoring damages O-ring seats in push-fit fittings. Use a dedicated plastic pipe cutter.
Over-tightening an adjustable cutter. Quarter turns between rotations. If you crank the screw down hard, the pipe deforms. An ovalised pipe won't accept a compression olive or push into a fitting. The pipe slice eliminates this mistake entirely.
Skipping the deburr. A small internal burr looks harmless. On a compression fitting, it stops the olive seating flat, and you get a slow weep that shows up weeks after the plumber has been paid. On a soldered joint, the burr prevents solder wicking into the joint properly. Ten seconds with a deburring blade prevents a callback.
Forgetting the spare wheel. A dull cutting wheel doesn't cut. It crushes. You end up applying more pressure to compensate, which deforms the pipe. Keep a spare wheel in the toolbox. They're inexpensive and take two minutes to swap.
Cutting without marking. "Measure twice, cut once" exists for a reason. Mark the cut line with a pencil or felt pen. Wrap a piece of tape around the pipe at the mark if you want a visual guide. An unmarked cut that's 3mm too short means a new piece of pipe and two more fittings.