The Emergency Electrician Guide
Your complete guide to emergency electricians
in London & the South East
Everything you need to know before you call: when an electrical fault is genuinely an emergency, what an honest 24-hour electrician charges, how the response works, and what happens once we're on site. Written by Steve Green, NICEIC-approved contractor with 25+ years of after-hours experience across South London, Surrey and Kent.
What does a 24-hour emergency electrician actually do?
An emergency electrician is a fully qualified, accredited contractor who responds to unsafe or urgent electrical faults outside the normal booking window — overnight, on weekends, on bank holidays, and within an hour during the working day. The job isn't simply "fixing electrics fast". It's making your property safe, then making it permanently compliant under BS 7671 (the IET Wiring Regulations) and Part P of the Building Regulations.
At 24/7 Electrical Ltd, every emergency call-out is attended by a NICEIC-approved engineer with calibrated test equipment. We diagnose the root cause, isolate the dangerous circuit, repair the fault using parts that meet current standards, and issue an Electrical Installation Certificate or Minor Works Certificate before we leave. That paperwork is what protects your insurance, your tenancy compliance and — if you're a landlord — your statutory obligations under the Electrical Safety Standards Regulations 2020.
We've been answering emergency calls across Croydon, Bromley, Sutton, Lewisham, Streatham, Dulwich and the wider South London and Surrey area for more than two decades. The most common 3am calls we get are: a consumer unit that won't reset after a shower trip, a burning smell from a kitchen socket where an appliance has overheated, or a complete loss of power in part of the home after a faulty extension lead has damaged a ring main. None of these are jobs that should wait until Monday.
When should you call an emergency electrician?
Not every electrical problem is an emergency — but several are, and waiting can turn a minor repair into a fire-damage insurance claim. Call an emergency electrician immediately if you notice any of the following warning signs:
Burning smell from a socket, switch or consumer unit — stop using the circuit and call us immediately.
Sparks, arcing or visible scorch marks around an outlet, fuse box or light fitting.
Repeated RCD or breaker trips that won't reset, or that trip again within minutes.
Total power loss to part of the property when neighbours still have supply (i.e. it's not a UK Power Networks outage).
Lights flickering, dimming or pulsing across multiple rooms, especially when appliances cycle on.
A small electric shock from a tap, appliance or metal fitting — a sign of a serious earthing fault.
If you're unsure whether what you're seeing is an emergency, err on the side of caution — switch off the main isolator at your consumer unit (the large switch at the very top), keep clear of the affected area and call us on 0203 576 6961. We'll talk you through it in plain English on the phone, free of charge, and tell you honestly whether you need an immediate visit or whether it can safely wait until morning.
How our emergency electrician service works — step by step
Most homeowners have never had to call an out-of-hours electrician before, so the process is unfamiliar and the stress amplifies it. Here's exactly what happens from the moment you ring us, so there are no surprises:
-
01
Call answered in under 20 seconds
Steve or a senior engineer picks up — never a call centre or answering service. We'll triage your problem on the line, give you safe steps to take while we travel, and confirm an exact arrival window before we hang up.
-
02
Engineer dispatched within minutes
We have NICEIC-approved electricians on the road across London and the South East day and night. The closest available van is rerouted to you immediately — typical on-site arrival is under 60 minutes for most postcodes.
-
03
Diagnose the fault safely
We isolate the affected circuit, test with calibrated meters (insulation resistance, loop impedance, RCD operation, polarity) and identify the root cause — not just the symptom. You'll see exactly what we find.
-
04
Fixed price agreed before any work
Once we know what's wrong, we quote a single fixed price in writing. No hourly creep, no padded materials, no surprise add-ons. If you don't want to proceed, you only pay the call-out fee.
-
05
Repair, test and certify
We fix the fault using parts that meet or exceed BS 7671. Every repair is then re-tested and you receive an Electrical Installation Certificate or Minor Works Certificate, plus our 12-month workmanship guarantee.
Common emergency electrical faults we fix every week
Roughly 80% of the emergency calls we attend in any given week fall into one of six recurring problems. Knowing what they look like — and what causes them — often helps you describe the symptoms accurately on the phone, which gets the right engineer to you faster.
1. Consumer unit / fuse box repeatedly tripping
By far the most common emergency. The RCD (residual current device) trips because it has detected current leaking to earth — usually from a faulty appliance, a damaged cable, or moisture in an outdoor circuit. Forcing the switch back up doesn't fix it; it just delays the diagnosis. We isolate each circuit in turn, identify which one is at fault, and either repair the cable or replace the offending accessory. See our consumer unit replacement page if yours is an older split-load board that keeps failing.
2. Burning smell from a socket or switch
Almost always caused by a loose terminal — the cable behind the faceplate hasn't been screwed down tightly enough (often an issue with badly fitted DIY work or historic builder's wiring), the connection arcs, and the heat melts the plastic insulation. Never keep using a socket that smells of burning plastic. We replace the accessory, test the upstream cable for damage, and check the rest of the ring main for the same fault.
3. Total loss of power to one room or floor
A circuit breaker has tripped and the cause needs to be identified before it's re-energised. Sometimes the cause is obvious (a kettle that's started leaking, for example); sometimes the cable itself has failed inside a wall and needs replacing. We use insulation resistance testing to find the exact location of the break.
4. Hot light fittings, ceiling roses or downlights
Usually caused by the wrong wattage bulb fitted in an enclosed fitting, or a halogen downlight installed too close to insulation. The risk is real — overheated ceiling roses are a common ignition source for loft fires. We fit appropriate fire-rated replacements and confirm the loft insulation is correctly cut back. Browse our lighting installation service for permanent fixes.
5. Shower or cooker circuit failure
High-load circuits (showers, ovens, hobs, EV chargers) are the most prone to terminal failure because they carry the most current. A failed shower isolator or a burnt-out cooker connection unit is a frequent late-night emergency. We replace the failed component with a properly rated MCB and isolator, and certify the circuit back to BS 7671 standards.
6. Smoke alarms chirping or false-triggering at night
Mains-wired smoke alarms are required to be interlinked under current Building Regulations. When one fails, the whole system can false-trigger or chirp. We replace the failed unit on the same visit and verify all interlinks are functioning. Battery back-up units are upgraded to 10-year sealed lithium where appropriate.
Where we cover — emergency electrician postcodes
We're based on the South London / Surrey border and our overnight cover stretches across the whole of South London, the immediate South East, and the North Surrey and North Kent commuter belt. Click any area below to see local response times, postcode-specific information and dedicated emergency electrician pages:
Croydon
CR0, CR2, CR5, CR9
Bromley
BR1, BR2, BR3
Sutton
SM1, SM2, SM5
Lewisham
SE13, SE14
Streatham
SW16
Tooting
SW17
Dulwich
SE21, SE22
Sydenham
SE26
Beckenham
BR3
Penge
SE20
Orpington
BR5, BR6
Mitcham
CR4
Caterham
CR3
Oxted
RH8
Edenbridge
TN8
Westerham
TN16
Why customers choose us over other 24-hour electricians in London
There are dozens of emergency electrical contractors advertising in London. Most outsource their out-of-hours calls to a national lead-generation firm, which then subcontracts the job to whichever electrician happens to be free — frequently someone you've never spoken to, with no accountability if the work isn't right. The engineer who arrives is rarely the engineer who'll come back if there's a problem.
We work differently. Every call rings directly to Steve Green, our founder and lead engineer (MIET, EngTech, LCIBSE), or to one of his three senior engineers. The person who quotes you is the person who attends, signs the certification and stands behind the 12-month workmanship guarantee. That accountability is why our Google rating sits at 4.9 out of 5 across more than 180 reviews and our Checkatrade score is 9.8 out of 10.
We carry £5 million public liability insurance, every engineer is Part P registered and NICEIC-approved, and we hand over full paperwork on completion of every visit — even a 20-minute socket repair gets a Minor Works Certificate. If you're a landlord, that documentation is your defence against the Electrical Safety Standards (England) Regulations 2020. If you're selling, it's the paperwork your conveyancer will ask for.
Other electrical work we cover
Emergency call-outs are roughly half of what we do. The other half is planned work — most of which gets booked in by customers who first met us at 11pm with a tripped board and a kettle that wouldn't boil. If you've been thinking about any of the following, we offer free written quotes with no pressure:
Emergency electrician FAQs
How quickly can a 24/7 emergency electrician get to me in London?+
For most London and South East postcodes our average emergency response time is under 60 minutes from the moment your call is answered. We have NICEIC-approved engineers on rotating overnight cover, so calls placed at 2am are handled exactly the same as calls placed at 2pm. When you ring 0203 576 6961 we'll tell you the realistic arrival window before we end the call.
What counts as an electrical emergency?+
Any situation where the electrics are unsafe, smoking, sparking, scorching, shocking, repeatedly tripping the consumer unit, or where you've lost power to part of the property and your neighbours still have supply. Burning smells from sockets, switches or fuse boxes are always treated as an emergency. If in doubt, switch off the main isolator at the consumer unit and call us — we'll talk you through it.
Will I know the cost before any work starts?+
Yes. After the diagnostic visit we agree a single fixed price for the repair in writing before any further work — no hourly creep, no padded materials, no surprise add-ons. If you don't want to proceed, you simply pay the call-out fee and we leave the property safe.
Are you NICEIC approved and insured?+
Yes. We are NICEIC-approved contractors and Part P registered, which means every job is signed off to BS 7671 (the IET Wiring Regulations) and notified to your local building control where required. We carry £5 million public liability insurance and issue full Electrical Installation Certificates or Minor Works Certificates on completion.
Will you charge a call-out fee if you can't fix the fault on the same visit?+
No. If we genuinely can't repair the fault — for example because a specialist part needs ordering, or the supply itself has failed and is the responsibility of UK Power Networks — you only pay the call-out diagnostic fee. There is no charge for the additional time we spend on site, and the call-out fee is deducted from the final bill if you ask us to return and complete the work.
Do you cover commercial properties as well as homes?+
Yes. We respond to emergency electrical faults in offices, shops, restaurants, salons, gyms, warehouses and small industrial units across London and the South East. Commercial out-of-hours response is prioritised and we issue compliant certification and Electrical Installation Condition Reports on completion. See our commercial electrical services for details.
What postcodes do your emergency electricians cover?+
We cover the whole of South London, South East London and the immediate Surrey and Kent commuter belt — including CR (Croydon, Caterham, Mitcham), SM (Sutton, Carshalton), SW (Streatham, Tooting, Wimbledon), SE (Dulwich, Sydenham, Lewisham, Penge), BR (Bromley, Beckenham, Orpington), RH (Oxted), and TN (Edenbridge, Westerham). If you're outside these postcodes, call us anyway — we often travel further for genuine emergencies.
What should I do while I wait for the electrician to arrive?+
If you can smell burning, switch off the main isolator at the consumer unit (the big switch at the top) — this kills power to the whole property and makes everything safe. Unplug high-load appliances like ovens, kettles and space heaters. Don't try to reset a tripped RCD repeatedly — if it won't stay on, there's a real fault and forcing it can damage circuits. Stay clear of any sparking outlet or fitting, and keep children and pets away from the affected area until we arrive.
On-site within 60 minutes
Got a live electrical emergency?
Call now — Steve or a senior engineer answers in under 20 seconds, day or night. No call centre, no triage queue, no surprise charges.
0203 576 6961
