A domestic electrical safety check is a visual inspection where you look at accessible equipment, without tools and without removing any cover. A homeowner can carry out these checks themselves, and most of the useful ones take under a minute. You can inspect plugs, sockets, flexes and extension leads. You can press the test button on your RCD. You can notice warmth, discolouration, buzzing and burning smells, and you can look at the outside of your consumer unit.
What you cannot do is open an enclosure, work on fixed wiring, or decide what a repeated fault means.
This guide covers each of those checks in the order a homeowner would work through them:
- The legal boundary first,
- Then a checklist with intervals,
- Then plugs, fuses and flexes,
- Then the warning signs that something behind the wall has already overheated,
- Then extension leads and cable reels,
- The RCD test button,
- The consumer unit and EICR intervals, and
- Finally outdoor and bathroom sockets.
Some checks belong to a routine. Others are one-offs triggered by buying a property or an appliance.
What Electrical Safety Checks Can a Homeowner Legally Do Themselves?
A homeowner can legally carry out any check that does not involve opening an enclosure, altering a circuit, or connecting anything to fixed wiring. That covers looking, listening, smelling and pressing a test button. It covers nothing that requires a screwdriver going into a live installation.
The rule that sets the boundary is Part P of the Building Regulations, which classifies certain electrical work as notifiable. In England, notifiable work is a short list: installing a new circuit, replacing or upgrading a consumer unit, and any work in a location containing a bath or shower. Wales retains a broader list that includes outdoor wiring. Notifiable work must be carried out by an electrician registered with a competent person scheme, or notified to building control before it starts.
Everything in this guide sits outside that list, because none of it is work. It is inspection. The technical standard those installations are built to is BS 7671, and its requirements are the reason several of the checks below have a defined interval rather than a vague “occasionally”. Where a check turns up something, the next step is nearly always the same one: stop using the item and speak to a qualified electrician.
Which Electrical Safety Checks Require a Qualified Electrician?
The criterion is simple. If a task involves the inside of an enclosure, the fixed wiring, or the issuing of a certificate, it belongs to a qualified electrician. That list is:
- Anything inside a consumer unit or fuse box
- Fixed wiring in walls, floors and ceilings
- Rewiring, in part or in full
- Diagnosing why a circuit breaker trips repeatedly
- Installing or altering outdoor sockets
- Installing or altering bathroom sockets and fittings
- Issuing an Electrical Installation Condition Report
- Investigating suspected faulty wiring
None of these are grey areas, and none of them become homeowner tasks because the fault looks small. A socket that has scorched is a fixed-wiring problem until an electrician says otherwise.
The Home Electrical Safety Checklist: What to Check and How Often
The table below sets out a home electrical safety checklist for a UK property, with the interval for each item. Intervals matter more than thoroughness here, because the failures these checks catch develop gradually.
| Check | What you are looking for | How often |
|---|---|---|
| Plugs and sockets | Cracks, discolouration, warmth, loose fit | Every few months, and whenever something feels wrong |
| Appliance flexes | Splits, brittleness, exposed conductors, taped repairs | Before each use on anything moved regularly |
| Extension leads and adaptors | Total load, damage, daisy-chaining | Every few months |
| Cable reels | Fully unwound before any load | Every use |
| RCD test button | Trips and resets correctly | Every six months |
| Consumer unit exterior | Condition, labelling, presence of test buttons | Annually, by eye only |
| Second-hand appliances | Plug, flex, casing, fuse, rating plate | On purchase, before first use |
| Full inspection (EICR) | Condition of the whole installation | Every ten years for owner-occupiers |
Most of that list happens with an item in your hand.
How Do You Check Plugs, Sockets and Cables by Eye?
Unplug the item, then look at three things in order: the plug body and pins, the point where the flex enters the plug, and the socket you took it out of. The IET Code of Practice calls this a user check, and it is the same first stage that a trained tester performs before any instrument is connected.
On the plug: look for cracks in the casing, brown or black discolouration around the pins, pins that are bent or loose in the body, and any sign of melting. On the flex where it enters the plug: the cable should be held by the cord grip on the outer sheath, not by the coloured conductors inside. If the sheath has pulled back and you can see coloured insulation at the plug entry, the grip has failed.
On the socket: look for cracks in the faceplate, discolouration around the pin holes, and a loose or wobbly fit when a plug goes in. A plug that will not sit firmly is not a minor annoyance. It means the contacts inside are not gripping properly, and poor contact generates heat.
Two contexts need slightly different attention. An appliance in constant use gets checked for wear at the flex. An appliance that has been in storage gets checked for brittleness and for damage caused by whatever was stacked on top of it.
What Does a Damaged Flex or Frayed Appliance Cable Look Like?
A damaged flex shows cracked, brittle or split outer insulation, coloured conductor visible anywhere along its length, or a previous repair covered in tape. Any one of those means the appliance stops being used.
Look also at the two points where flexes fail first: where the cable enters the appliance, and where it enters the plug. Both take repeated bending. A kink that has set into a permanent fold has already stressed the conductors inside, even when the outer sheath still looks intact.
Tape is not a repair. It hides the damage without restoring the insulation, and it keeps a fault in service. A damaged flex is either replaced by someone competent to replace it, or the appliance goes out of use.
Plug Fuse Rating: 3A or 13A, and How to Choose
The fuse in a UK plug protects the flex, not the appliance. That is the principle behind every rating decision, and it is why fitting a larger fuse to stop one blowing is dangerous rather than practical. UK plug fuses are made to BS 1362, and manufacturers have standardised on two ratings for domestic use. The table sets out which applies where.
| Fuse rating | Colour | Appliance power | Typical appliances |
|---|---|---|---|
| 3A | Red | Up to 700W | Table lamps, standard lamps, televisions, computers, soldering irons |
| 13A | Brown | 700W to 3,000W | Kettles, toasters, irons, microwaves, washing machines, dishwashers |
The working rule is the 700W rule: at or below 700W fit a 3A fuse, above 700W fit a 13A fuse. Published example lists disagree on some borderline items … Electrical Safety First groups fridges and freezers with the 13A appliances, while London Fire Brigade’s guidance groups them with the 3A ones. Where lists disagree, the appliance settles it. The rating plate gives the wattage, and the manufacturer’s marking on the plug or in the instructions gives the specified fuse. Fit the rating specified, and replace like for like.
A fuse that blows repeatedly is reporting a fault in the appliance or its flex. The answer is to stop using the appliance, not to fit a bigger fuse. What that fuse is preventing is heat.
What Are the First Warning Signs of Faulty Wiring in a House?
The first signs are heat and noise: a socket or switch plate that feels warm, a burning or fishy smell near a fitting, and buzzing or crackling from behind a faceplate. Scorch marks, repeated tripping and flickering across several rooms follow.
The full set worth acting on:
- Socket or switch faceplates that feel warm to the touch
- Brown, yellow or black discolouration around sockets and switches
- A persistent burning, acrid or fishy smell near electrical fittings
- Buzzing, crackling or humming from a socket, switch or the consumer unit
- Scorch marks anywhere on a faceplate or the consumer unit
- Circuit breakers that trip repeatedly without an obvious cause
- Lights flickering in more than one room at once
These are symptoms, not diagnoses. They tell you something needs attention; they do not tell you what.
Faulty electrical appliances are one common origin, and the pattern of which appliance types dominate house fire statistics is worth knowing if you want to understand where the risk concentrates in a home … a house fire that starts at a socket and one that starts inside a machine are different failures with different warning signs, and we cover the appliance side in our guide to the electrical appliances that cause house fires.
Why Is My Plug Socket Warm to the Touch?
A socket faceplate that is warm indicates resistance at a connection behind it, which generates heat where no heat is designed to go.
There is a benign version worth distinguishing. A plug body can feel slightly warm after a high-load appliance such as a kettle or heater has been running, because the plug and fuse carry that current. That warmth is in the plug, it is mild, and it fades. The reportable version is different: the socket faceplate itself is warm, or the warmth persists after the appliance is unplugged, or the same socket is consistently warmer than others in the house.
Stop using that socket and arrange for an electrician to inspect it. Do not remove the faceplate to look.
Scorch Marks Around a Plug Socket: What to Do
Stop using the socket, switch that circuit off at the consumer unit, and book a qualified electrician. That is the whole homeowner action.
A scorch mark is not a warning of something that might happen. It is evidence that overheating has already happened at that point, at a temperature high enough to mark the surface. A socket showing scorch marks can still work perfectly, which is precisely why the mark gets ignored. Cleaning it off removes the evidence and leaves the fault.
Do not remove the faceplate to see how bad it is underneath. What caused the mark is on the other side of it.
When a Circuit Breaker Keeps Tripping
The homeowner action is to identify which circuit trips, unplug everything on it, and report the pattern to an electrician. Nothing beyond that.
Note which breaker moves, what was running at the time, and whether the trip repeats when the circuit is loaded again. That information is useful to whoever investigates. Working out the cause is an electrician’s job, because the possibilities include the appliance, the socket, the cable and the breaker itself, and separating them needs instruments and isolation. Repeatedly resetting a breaker that keeps tripping is not a fix; it is the removal of a warning. Often the trigger is simply what has been plugged into the circuit.
Extension Leads and Cable Reels: The Rules That Matter Most
A standard UK extension lead is rated at 13A in total, shared across all of its sockets, not 13A per socket. Thirteen amps is roughly 3,000W at UK mains voltage, and that ceiling applies to everything plugged into the lead at once.
The rating is printed on the lead, usually on the face of the plug or the moulded body. Older leads exist rated at 5A or 10A, and those limits are lower again. Use a fused inline lead rather than a block adaptor that stacks plugs in a wall socket, because the block adaptor puts the mechanical load of several plugs onto one set of socket contacts. UK extension lead safety rules come down to three things: know the rating, add up the load, and keep the lead undamaged and uncovered.
How Many Appliances Can I Safely Plug Into One 13A Socket?
Count is the wrong measure. The limit is 13A, or about 3,000W, across everything drawing from that socket at the same time. Six phone chargers are fine. Two kettles are not.
Work it in watts. A kettle draws around 2,000W to 3,000W on its own. A fan heater is similar. A toaster sits around 1,000W. Put a kettle and a heater on the same extension lead and the total exceeds what the lead is built to carry, even though only two things are plugged in. Overloaded socket warning signs follow quickly: warmth in the lead body, a hot plug, or a smell of hot plastic. High-load kitchen appliances belong in wall sockets of their own.
Is It Safe to Plug One Extension Lead Into Another?
No. Chaining leads does not add capacity. Every lead in the chain still draws through one 13A supply, and each additional connection adds another set of contacts that can loosen and heat up.
If a lead does not reach, the answer is a single longer lead rated for the load. If the same spot needs power permanently, the answer is an additional socket installed by a registered electrician, which is a small job and removes the trailing cable at the same time.
Why Does a Cable Reel Overheat When It Is Not Fully Unwound?
A wound cable reel cannot shed the heat its cable generates, so its safe load while wound is a fraction of its unwound rating. Reels carry two figures on the drum label for exactly this reason: an unwound rating, commonly 13A, and a much lower wound rating, commonly a few amps.
The physics is straightforward. A conductor carrying current produces heat. Laid out flat, air circulates around the whole length and the heat disperses. Wound on a drum, every turn sits against warm turns on either side, with the drum body behind it. The heat has nowhere to go, so the temperature climbs until the PVC insulation begins to soften … and it can do that while the current is still inside the number printed on the label.
Most reels sold in the UK include a thermal cut-out that trips if the drum overheats. Treat it as a backstop, not as permission. Unwind the reel completely before connecting anything, regardless of how much cable you actually need. Where a load is high and sustained, such as a heater, use a wall socket instead. That heat problem is one of two the installation guards against; the other is what an RCD exists to catch.
How Often Should I Press the Test Button on My RCD?
Press the RCD test button every six months. BS 7671:2018 sets the interval at six months in Regulation 514.12.2, changed from the quarterly interval required by earlier editions, and the label on the consumer unit states the interval that applies to your installation.
An RCD, or residual current device, is the protective device in a consumer unit that disconnects the supply when it detects current leaking to earth … the fault condition that causes electric shock. It is the device that protects people rather than cables.
The check takes under a minute:
- Find the button marked T or Test on the RCD or RCBO in your consumer unit.
- Press it firmly. Power to the protected circuits will drop, so save anything open on a computer first.
- Confirm the switch has moved to the off position.
- Move it back to on to restore power.
Some manufacturers specify a shorter interval than six months on their own devices. Where the label on your consumer unit says something different from six months, follow the label.
A useful memory anchor is the clock change, which puts the test on a twice-yearly rhythm without needing a reminder.
One limit is worth knowing. The push-button test confirms the mechanism still moves. It does not measure how fast the device disconnects. Measured trip time is instrument work, carried out during a full inspection.
What Should I Do If My RCD Does Not Trip When I Press the Test Button?
Call a qualified electrician promptly. Do not investigate it, and do not assume the button is stiff.
An RCD that does not trip on test will not trip on a fault. That is the whole significance of the result: the device fails silently, it gives no indication in daily use, and the installation carries on looking normal while the shock protection is absent. Until it is replaced or repaired, the circuits it covers have no residual current protection.
Consumer Unit and EICR Checks a Homeowner Can Make
This is a look-only check. The consumer unit stays closed, the cover stays on, and nothing is touched beyond the test button described above.
From the outside you can note several useful things. Whether the unit uses modern circuit breakers or older rewirable fuse carriers with fuse wire. Whether any device carries a button marked T or Test, which indicates RCD protection is present. Whether the RCD test label is fitted and what interval it states. Whether the circuits are labelled clearly enough that you know which breaker serves which part of the house. And the general condition of the enclosure … discolouration, scorching or a smell of hot plastic around a consumer unit is a call-an-electrician-today situation, not an observation.
A consumer unit fuse box safety check for homeowners ends there. Everything behind the cover carries the incoming supply, which remains live when the main switch is off.
Is an EICR a Legal Requirement for Homeowners in the UK?
No. An Electrical Installation Condition Report is not a legal requirement for an owner-occupier in the UK. It is recommended at a maximum interval of ten years, and that recommendation comes from the IET’s consumer guidance and from the electrical safety charity Electrical Safety First.
An EICR is a full inspection and test of the fixed installation, carried out by a qualified person, which grades what it finds … C1 for danger present, C2 for potentially dangerous, C3 for improvement recommended, and FI where further investigation is needed. It results in a satisfactory or unsatisfactory outcome for the installation as a whole.
The position differs for rented property, and the difference is worth understanding precisely because so much online guidance blurs the two. A landlord letting a property in England has a legal duty under the Electrical Safety Standards in the Private Rented Sector (England) Regulations 2020 to have the fixed installation inspected at least every five years, or at change of occupancy, and to give the tenant a copy. That duty carries enforcement behind it, and the scale of it is set out in our guide to landlord electrical safety penalties. None of those obligations transfer to a homeowner living in their own house.
Ten years is a ceiling rather than a target. Buying a property, inheriting one, or moving into a house whose inspection history is unknown are all sensible triggers to book one sooner.
How Old Does House Wiring Have to Be Before It Needs Replacing?
Age alone does not decide it. Condition does, and condition is assessed at an EICR rather than estimated from a build date. A well-maintained older installation can be satisfactory, and a neglected newer one can fail.
What age does give you is a set of indicators worth noticing:
- Rubber or fabric-insulated cable, which was in use until around the 1960s and becomes brittle as it ages
- Round-pin sockets
- A rewirable fuse board with fuse wire rather than circuit breakers
- No device anywhere in the consumer unit carrying a test button, indicating no RCD protection
- Sockets with no earth connection
Any of these justifies booking an inspection rather than waiting for the ten-year mark. Note that an installation showing all five can still power the house perfectly well. Working and satisfactory are different judgements, and only one of them is a homeowner’s to make.
Outdoor and Bathroom Sockets: What Correct Installation Looks Like
This section is about recognising correct provision, not creating it. Both locations are governed by specific requirements, and work in either is notifiable under Part P.
Outdoors, equipment needs a weather rating. IP44 is the minimum for outdoor use, meaning protection against solid objects above 1mm and against splashing water from any direction. Ordinary indoor extension leads carry no IP rating at all and are not suitable outside, even briefly. BS 7671 Regulation 411.3.3 requires 30mA RCD protection for socket-outlets rated up to 32A and for mobile equipment used outdoors. So the recognisable pattern of a correct outdoor socket is: weatherproof enclosure, marked IP rating, and RCD protection upstream.
Bathrooms are governed by Section 701 of BS 7671, which divides the room into zones by proximity to the bath or shower. Zone 0 is the interior of the bath or shower tray and requires IPX7, meaning immersion-proof. Zone 1 runs above it to 2.25m and requires IP65. Zone 2 extends 0.6m beyond zone 1 and requires IP44. Every circuit serving the location must have 30mA RCD protection under Regulation 701.411.3.3. Standard 13A socket-outlets are not permitted within 3m horizontally of the zone 1 boundary; the one permitted exception is a shaver supply unit with an isolating transformer.
If a bathroom in your home has a standard 13A socket close to the bath, or an outdoor socket with no weatherproof enclosure, that is something to raise with a registered electrician. It is not something to correct yourself.
Do I Need PAT Testing for Appliances in My Own Home?
No. There is no legal duty to have appliances tested in a home you own and occupy. The duty arises when you supply appliances to someone else, which is a different situation with different rules.
That said, the user check described earlier and instrumented testing are not the same thing, and it is worth being clear about the gap. A visual check finds most of the dangerous faults, which is why it is the first stage of any proper testing regime. It does not find the faults that sit inside the casing. Whether a homeowner should go further than looking is a separate question, and one we answer in detail in our guide to PAT testing for homeowners.
The place that gap matters most is with an appliance whose history you do not know.
Second-Hand Appliances: What to Check Before You Plug One In
An appliance bought second-hand arrives with no service history, no record of how it was stored, and no assurance about what has been done to its plug. Before first use, check four things: the plug body and pins for cracks and discolouration, the flex along its whole length for splits and brittleness, the casing for cracks or missing screws, and the rating plate for the appliance wattage. Then check the fuse fitted matches what the wattage calls for, because a previous owner replacing a blown fuse with whatever was to hand is common, and a 13A fuse in a 300W lamp gives that flex no protection at all.
An appliance with no legible rating plate cannot be assessed this way at all. PAT testing second-hand appliances bought for the home exists precisely because these items skip the checks a new appliance has already passed at the factory. What a visual check will not reveal is insulation resistance or earth continuity … both are internal, both are measured with an instrument, and both are the difference between an item that looks fine and one that is proven safe.
What Testing Costs, and What Learning to Test Costs
If you decide instrumented testing is worth having, there are two routes, and the arithmetic between them is the whole decision. Paying a contractor is a recurring cost: a per-item rate plus a minimum charge each visit, repeated every time you want appliances checked. The current UK figures are set out in our breakdown of PAT testing cost. Learning to test is a one-off cost, after which the recurring part is your own time. The range of course prices, and what drives the gap between the cheapest and the most expensive, is covered in how much a PAT testing course costs.
Be clear about what training buys, because this is where a lot of marketing overstates. A one-day PAT testing course teaches appliance testing: visual inspection, instrument use, interpreting results, and record keeping. It does not qualify anyone to work on fixed wiring, to touch the inside of a consumer unit, or to issue an EICR. Those remain the work of a qualified electrician, and no amount of appliance training changes that. What training changes is the appliance side … the checks you already do by eye, extended to the tests you currently cannot do at all.
GET QUALIFIED
Every figure on this page starts with the certificate
One day, no electrical experience needed, and a UKRS-accredited Certificate of Competence at the end of it. Three formats, so you can pick the one that fits how you work.
Electrical Safety Checks That Are Not a Homeowner’s Job
The boundary this guide opened with is the same one it closes on. Looking, listening and pressing a test button are a homeowner’s job. Opening an enclosure, altering a circuit, diagnosing a fault or certifying an installation is not, and the reason is not bureaucratic. Fixed wiring stays live when appliances do not, and the faults that matter most are the ones behind a surface that still looks normal.
Can I Replace a Socket Faceplate Myself?
Replacing a faceplate means disconnecting conductors from fixed wiring, which is work rather than inspection. Use a registered electrician. If the existing faceplate is cracked, scorched or warm, that is a fault to report, and swapping the cover would hide it rather than fix it.
Does a Warm Plug Always Mean a Fault?
No. A plug body can warm slightly while a high-load appliance such as a kettle or heater is running, and that warmth fades after use. A warm socket faceplate, or warmth that persists once the appliance is unplugged, is a different matter and needs an electrician.
Is a Fuse Box the Same Thing as a Consumer Unit?
They serve the same purpose, but the terms usually signal different generations of equipment. “Fuse box” commonly describes an older board with rewirable fuse carriers. “Consumer unit” describes a modern enclosure with circuit breakers and, in current installations, RCD protection. Either way, the outside is a homeowner’s to look at and the inside is not.
