Homeowner Guide
Electrical work you can do yourself in the UK
A plain-English summary of minor, like-for-like electrical repairs that UK homeowners can legally carry out under Part P of the Building Regulations — and the important jobs that must be left to a registered electrician.
Important caveat
Electricity can kill, burn down a home or invalidate your insurance. The information below is general guidance only and is not a substitute for proper training. If you are in any doubt about your ability, the condition of the wiring, or whether the work is notifiable, stop and contact a qualified, registered electrician. All Cabling© Limited accepts no liability for work carried out by others based on this guide.
Basic home repairs (like-for-like)
In England and Wales, Part P of the Building Regulations allows householders to carry out minor, non-notifiable electrical work — essentially replacing an existing accessory with one of the same type and rating. Scotland and Northern Ireland have their own building-control regimes, so check locally if your property is outside England and Wales.
Replacing sockets & fused connection units
You may replace an existing socket outlet or fused connection unit (FCU) with a new one of the same type and rating, provided the circuit itself is not altered. Always turn off the power at the consumer unit, verify the circuit is dead with a suitable voltage indicator, and note the exact terminal positions before disconnecting anything. Loose terminations are a leading cause of overheating and fire.
Changing light fittings
An existing ceiling rose or pendant can usually be swapped for a new fitting of equivalent rating without notifying building control. Strip back only enough outer sheath to reach the terminal block, connect brown (Live), blue (Neutral) and green/yellow (Earth) to the corresponding terminals, and make sure the earth tail is long enough to be the last conductor to break if the fitting is pulled.
Like-for-like accessories
Other minor replacements — such as switches, dimmers, cooker control units and pull-cords — are generally allowed on a like-for-like basis, provided no new circuit is created and the rating is not increased. If you are unsure which conductor goes where, stop and call a qualified electrician.
Selecting the correct fuse
Every UK plug contains a BS 1362 cartridge fuse. Choosing the right rating protects the appliance flex from overheating if a fault occurs. The fuse rating is matched to the appliance, not to the socket.
| Fuse rating | Typical use |
|---|---|
| 3A fuse | Low-wattage appliances up to about 700 W — table lamps, radios, TVs, computers, phone chargers and small electronics. |
| 13A fuse | High-wattage appliances from about 700 W up to 3,000 W — kettles, toasters, irons, heaters, microwaves and vacuum cleaners. |
If the appliance rating plate specifies a fuse, use that value. Never replace a blown fuse with a nail, foil or a higher-rated fuse — it removes the protection and is a common cause of electrical fires.
Before you start any DIY electrical job
- 1.Switch off the circuit at the consumer unit and label it so nobody turns it back on.
- 2.Prove the circuit is dead with an approved voltage indicator and a proving unit — do not rely on a wall switch.
- 3.Photograph the existing terminals before disconnecting anything.
- 4.Use the correct screwdriver, check terminations are tight, and never leave copper strands showing.
- 5.If anything looks damaged, burnt, cracked or you smell fish/urine-like odours, stop and call an electrician.
Important boundaries: what NOT to do
Never attempt notifiable electrical work without using a registered electrician or signing the work off via your local council's building control. Doing so can be dangerous, may invalidate your home insurance and could create problems when you sell the property.
- ✕Installing a completely new circuit, such as adding an outdoor socket from scratch or running a new radial to a garden office.
- ✕Any work in a special location, particularly bathrooms, which are governed by strict IP zoning rules under BS 7671 Section 701.
- ✕Modifying, altering or testing the consumer unit (fuse board), including fitting new protective devices or reconfiguring circuits.
- ✕Altering the earthing or bonding arrangements of the installation.
- ✕Adding or moving fixed electrical equipment that requires a new dedicated circuit, such as an electric shower, cooker or EV charge point.
Still unsure? Ask a professional
If a job feels beyond your comfort zone, it almost certainly is. Paul is NAPIT registered and qualified to 18th Edition standards, so any notifiable work can be self-certified and a compliance certificate issued.