A dripping tap, loose trap or slow-draining basin rarely needs a van full of specialist equipment. The best plumbing tools for DIY are the ones that let you isolate the water, remove the fitting cleanly and remake the joint without damaging the pipework. Buy for the jobs you are likely to face, not for a one-off tool collection that sits untouched in the shed.
For most homes, a sensible plumbing kit covers tap repairs, wastes, traps, compression fittings and short runs of copper or plastic pipe. Quality matters where a tool grips, cuts or seals. A cheap adjustable spanner is frustrating; a poor pipe cutter can leave a distorted end that will not seal properly.
Best plumbing tools for DIY jobs around the house
1. Adjustable spanners
Two adjustable spanners are the starting point for almost every domestic plumbing task. Use one to hold the body of a compression fitting steady and the other to turn the nut. This prevents strain on the pipe or fitting, particularly under a sink where there is little room to work.
Choose solid, well-machined jaws with minimal play. A 150 mm and a 250 mm pair will cover most tap tails, isolation valves, traps and compression fittings. Do not use an adjustable spanner on rounded plastic nuts if a hand-tightened fitting is intended. It can crack the fitting or make future removal harder.
2. Water pump pliers
Water pump pliers provide a firmer grip than an adjustable spanner on awkward or larger fittings. They are useful for loosening seized trap connections, turning radiator valve components and holding pipework while another tool tightens a nut.
The trade-off is jaw damage. Bare steel jaws can mark chrome, brass and plastic. Wrap a polished fitting with cloth or tape where appearance matters, and apply pressure steadily rather than crushing the component. For regular plumbing work, pliers with a push-button adjustment are quicker and more secure than basic groove-joint types.
3. Pipe cutter
A proper pipe cutter earns its place as soon as you need to alter copper pipe. It produces a square, neat cut with less mess than a hacksaw, helping a compression or push-fit connection sit correctly. Small rotary cutters are particularly useful in cupboards and beneath basins, where a full-size hacksaw cannot move freely.
Match the cutter to the pipe size you expect to use, usually 15 mm or 22 mm on domestic systems. Turn the cutter gradually and tighten the wheel a little at a time. Forcing it can flatten soft copper tube. If the pipe is close to a wall or another fitting, a compact close-quarters cutter may be the only practical option.
4. Deburring tool and reamer
Cutting pipe leaves a burr on the inside and sometimes a sharp edge outside. A deburring tool or pipe reamer removes this cleanly. It is a small purchase that prevents restricted flow, damaged O-rings and poor-fitting connections.
This matters most with push-fit plumbing fittings. Their internal seals need a smooth pipe end, free from sharp edges. Even when using compression fittings, deburring makes the work cleaner and reduces the chance of a cut finger while assembling the joint.
5. Basin wrench
A basin wrench is made for the job that causes most DIY frustration: reaching the back nut on a tap under a basin. Its long handle and pivoting jaw can grip tap nuts in spaces where ordinary spanners simply will not fit.
It is not an everyday tool, but it pays for itself when replacing a monobloc mixer tap or tightening loose tap fixings. Check the jaw range before buying. Most domestic tap nuts are covered by a standard model, but access can still be limited by pedestal basins, vanity units and closely packed pipework.
6. Plunger and drain auger
Not every blockage needs chemicals or dismantling. A cup plunger is effective on basins, baths and sinks when the blockage is close to the waste outlet. Cover the overflow opening with a damp cloth, add enough water to seal the cup and use short, firm strokes.
For deeper blockages, a hand drain auger gives more reach. Feed the cable slowly, turning it as it meets resistance. It can clear hair, soap build-up and soft debris from waste pipes, but it will not solve a collapsed drain or a serious external blockage. Avoid aggressive force with older plastic wastes, which can be brittle.
7. Screwdriver set and hex keys
Plumbing repairs often begin with a small screw. Tap handles, toilet cisterns, isolation valves and shower fittings may use slotted screws, crosshead screws or hex grub screws. A compact screwdriver set with a good range of tips saves time and reduces damaged screw heads.
Keep a set of metric hex keys with it. Modern tap handles and shower controls commonly hide their retaining screw underneath or behind a small decorative cap. Take photographs as you dismantle parts, especially inside a cistern, so the reassembly is straightforward.
8. PTFE tape, jointing compound and washers
These are consumables rather than tools, but they belong in every practical kit. PTFE tape helps seal threaded metal joints, such as shower arms and certain valve connections. Wrap it in the direction the fitting will tighten so it does not unravel as the thread engages.
Do not use PTFE tape as a cure-all. Compression fittings seal with an olive, while many tap connectors and traps seal with a rubber washer. Adding tape to the wrong joint can stop it seating correctly. Keep a selection of fibre washers, rubber washers, olives and replacement O-rings for common repairs.
9. Junior hacksaw and spare blades
A pipe cutter is preferable for accessible copper, but a junior hacksaw remains useful for plastic waste pipe, threaded rod, brackets and situations where a cutter cannot rotate. Fit a sharp blade and let it cut rather than pushing hard.
After cutting plastic pipe, remove rough edges with a deburring tool or fine abrasive paper. Dry-fit the pieces before applying solvent cement, because once the joint is made there is very little time to correct alignment.
10. Tape measure, marker and torch
Poor measurements cause more wasted fittings than most people expect. A tape measure, permanent marker and bright inspection torch make installation work more accurate, especially inside dark sink units or behind appliances.
Mark pipe insertion depths before assembling push-fit joints. Measure twice before cutting, and allow for the depth of each fitting. A torch also helps identify whether a leak is coming from a compression nut, a tap tail, a trap washer or water tracking down from above.
Choosing tools by the pipework you have
The right kit depends on the system in front of you. Copper pipework benefits from a pipe cutter, deburring tool and two spanners. Plastic push-fit systems need clean, square cuts and properly prepared ends. Plastic solvent-weld waste pipe needs a saw, deburring tool and careful dry assembly before cement is applied.
Older properties may contain a mixture of materials, including copper, plastic and galvanised steel. Do not assume fittings are interchangeable. Measure the outside diameter of pipe, identify the fitting type and check whether the supply is mains pressure, heating water or a gravity-fed system before ordering parts.
Work cleanly and isolate the supply first
Before undoing any fitting, locate the isolation valve or stopcock and test that it actually shuts off the water. Open the tap afterwards to release pressure, then place a bowl and towels beneath the work area. Even a small amount of trapped water can empty across a kitchen unit or bathroom floor quickly.
Avoid working on gas pipework, unvented cylinders or major alterations to a central heating system unless you are competent and understand the relevant requirements. If a leak is concealed, a stopcock will not operate, or pipework is badly corroded, it is usually more economical to call a qualified plumber before damage spreads.
A dependable DIY plumbing kit is built one repair at a time. Start with the tools that cut, grip and measure accurately, keep a few common seals and fittings on hand, and replace worn consumables before the next small leak becomes a larger job.