DIY Safety Rules
Most DIY is safe when done correctly. These rules will keep you safe while you learn.
Emergency Numbers
Gas emergency
0800 111 999
24 hours
Power cut
105
UK-wide number
Water emergency
Call your supplier
Number on your bill
⚡Electricity Safety
Always turn off at the fusebox first
Find the relevant circuit breaker and switch it off. Then test the socket or light with a plug-in lamp or non-contact voltage tester before touching anything.
Never work live
Even if a switch is "off", the supply cable behind it may still be live. The only safe approach is to isolate at the fusebox.
Test before you touch
A non-contact voltage tester costs £8–15 and could save your life. Hold it near any wire before touching — it beeps or lights up if current is present.
Never work near water with electricity live
Bathrooms and kitchens are danger zones. Electricity and water together are fatal. Always isolate the circuit completely.
Call an electrician for new circuits
Adding sockets, moving wiring, or installing electric showers requires a certified electrician (Part P) in England and Wales. This is the law.
💧Water & Plumbing Safety
Know where your stopcock is
The stopcock (main water shut-off) is usually under the kitchen sink or where the water pipe enters the house. Turn it off before any plumbing work.
Turn off at the isolation valve, not just the tap
Most taps have an isolation valve on the pipe underneath. A flat-head screwdriver turns it 90° to isolate just that tap without cutting off water to the whole house.
Turn on slowly and watch for drips
When you restore water after a repair, turn the stopcock or isolation valve on slowly and watch all connections for at least 60 seconds before turning on fully.
Don't ignore small drips
A slow drip can cause serious damp, mould, and structural damage over months. Fix it early or call a plumber.
Never attempt to fix a burst pipe under pressure
If water is spraying or gushing, turn off the stopcock immediately. Then call a plumber. Don't try to patch it while it's under pressure.
🔥Gas Safety
Never DIY gas work — ever
Gas work in the UK must be performed by a Gas Safe registered engineer. This is a legal requirement, not a suggestion. Illegal gas work kills people every year.
Know where your gas shut-off is
The gas isolation valve is usually next to the gas meter, which is often outside the house or in a meter cupboard. Turning it 90° shuts off all gas supply.
If you smell gas — act immediately
Don't turn any lights or switches on or off. Don't use your phone inside the building. Get everyone out. Open doors and windows as you leave. Call the National Gas Emergency Service: 0800 111 999.
Get a carbon monoxide alarm
CO is colourless and odourless — you can't detect it without an alarm. It's legally required near gas appliances in rental properties and strongly recommended in all homes. Costs £15–30.
Service your boiler annually
An annual boiler service by a Gas Safe engineer costs £60–100 and catches problems before they become dangerous.
🪜Ladder Safety
Never use a ladder alone for roof or gutter work
Always have someone footing the ladder (holding the base). Falls from ladders are one of the most common DIY injuries.
Use the 1-in-4 rule
For every 4 metres of height, the base of the ladder should be 1 metre out from the wall. Too steep = risk of falling back. Too shallow = risk of the base slipping.
Check the ladder before use
Bent rungs, cracked stiles, or broken feet are deal-breakers. Never use a damaged ladder.
Don't overreach
If you're leaning to reach something, your belt buckle should stay within the ladder stiles. Move the ladder instead.
Wear non-slip footwear
Smooth-soled shoes on metal ladder rungs is a recipe for a fall. Wear shoes with rubber soles.
🥽When to Wear PPE
Safety glasses — always when drilling
Masonry dust and fragments travel fast. A £3 pair of safety glasses is cheaper than an eye injury.
Dust mask — when sanding or cutting masonry
Fine masonry and plasterboard dust is bad for your lungs. An FFP2 mask costs £1–2 each. Worth it.
Ear protection — when using power tools for extended periods
Drilling into masonry is loud enough to damage hearing over time. Foam earplugs cost pennies.
Gloves — when handling chemicals or rough materials
Wear nitrile gloves for drain unblockers or pipe cement. Wear work gloves for handling rough wood or metal sheet.
Knee pads — when working on floors for long periods
Optional but your knees will thank you.