When You Need an Emergency Electrician in London

Published August 2026 | When you need an emergency electrician

In the first 10 minutes

The first few minutes of an electrical emergency are about safety, not diagnosis. Here's what to do in order.

1. Cut the power at the consumer unit. Your fuse board or consumer unit is usually found under the stairs, in the hallway, or inside the kitchen cupboard. Flip the main isolator switch to "off." If you're not sure which switch to hit, cut the whole board. This stops electricity flowing to the affected circuit.
2. Get everyone away from the problem area. This includes pets. If you can see smoke, burning, or obvious fire, get outside and call 999. The London Fire Brigade attends electrical fires regularly - don't assume a small spark can't escalate quickly.
3. Stay away from anything electrical near water. If a fault has occurred near a sink, bathroom, or any flooded area, keep your distance from all fittings, switches, and sockets in that zone. Water and electricity are a dangerous combination, even after the main switch is off.
4. Note down what happened. While it's fresh, write down what you were doing when the fault occurred, which circuit or appliance was involved, whether you heard any sounds, and whether you saw sparks or scorch marks. This information saves the electrician significant time when they arrive.

Within the first hour

Once the immediate area is safe, the next step is working out what you're dealing with and making the right calls.

Identify the type of fault

Common electrical emergencies in London homes tend to fall into recognisable categories. A tripped circuit breaker that won't reset usually means there's an active fault on that circuit. An RCD (residual current device) that keeps tripping is often a sign of a leakage fault somewhere in the installation. A burning smell from a socket, consumer unit, or appliance is always serious. Visible scorch marks, melted plastic, or discolouration around any fitting needs professional attention the same day. Complete loss of power that isn't a supplier outage, or exposed and damaged wiring, are both urgent.

In older Greater London properties - Victorian terraces, Edwardian conversions, and postwar housing - our engineers often find outdated wiring that can make faults harder to trace and more likely to recur.

Check for a network outage first

Before calling a contractor, check whether there's a wider outage in your area. For most of London, your distribution network operator is UK Power Networks, which publishes a real-time fault map. If your neighbours are also without power, it's a network issue and no amount of emergency electrical work at your property will fix it.

What to have ready when you call

When you contact an emergency electrician, give them: the full address, a clear description of the fault, the approximate age of your property if you know it, and whether you have a modern consumer unit with RCDs or an older fuse board. This helps them bring the right equipment and give you a more accurate quote before they set off.

Look for contractors registered with NICEIC or NAPIT - these are the main approved contractor schemes in the UK, and registered electricians work to the BS 7671 wiring regulations. This matters for insurance and certification purposes after the work is done.

Same day

Once safety is established, getting a qualified professional to your door is the only priority.

What emergency electrical work costs in London

Emergency call-out fees in London typically range from 80 to 150 pounds just to attend, on top of labour and any parts needed. Hourly rates for emergency work commonly run between 80 and 150 pounds per hour, with out-of-hours rates - evenings, weekends, and bank holidays - sitting at the higher end or beyond. A contained job like replacing a damaged socket or investigating a single tripped circuit might cost 100 to 250 pounds all in. Fault-finding in a complex older Greater London property, where cables run through timber floors and behind original plaster, can take a full day and run to 500 to 700 pounds or more. Agree a call-out fee and hourly rate before the engineer arrives.

Not sure if it's urgent?

If you're uncertain whether your issue needs an emergency call-out or can safely wait until the morning, Voltrade's GoFIX diagnostic tool lets you describe the fault in plain language and get guidance on urgency before you commit to any contractor.

The repair visit

Understanding what happens during the visit means you can ask the right questions and know whether the work has been done properly.

How the inspection works

The electrician will start at the consumer unit and work through the affected circuit systematically. They'll use a multifunction tester to measure insulation resistance, continuity, and earth fault loop impedance. This is precise diagnostic work, not guesswork. Depending on the fault, they may need access to multiple rooms, and they may need to isolate sections of the installation while they test.

Typical repair timescales

• Replacing a damaged socket or light fitting: 30 to 60 minutes
• Tracing and repairing a fault on a single circuit: 1 to 3 hours
• Replacing a consumer unit: typically 4 to 8 hours - this is rarely same-day emergency work
• Full fault-finding in a complex older property: can take a full day

Certification and paperwork

Ask the engineer whether they noticed anything else during the visit. In London's older housing stock, it's common to find rewirable fuses, poorly sleeved earth wires, or wiring that's well past its useful life. A good electrician will flag these even if they're not the immediate cause of the callout.

The following week

The emergency is resolved, but a few steps in the days after help make sure it doesn't happen again.

Test your RCDs

Your consumer unit should have RCD protection on most circuits. Each RCD has a test button - press it to confirm the device trips correctly, then reset it. If it won't trip or won't reset after testing, call an electrician. RCDs are your primary protection against electrocution; a faulty one is not something to leave uninvestigated.

Work out what caused it

Was it an overloaded circuit? A failing appliance? Old wiring that finally gave out? Understanding the root cause prevents a repeat. If a specific appliance was involved - washing machines, tumble dryers, electric showers, and immersion heaters are common culprits in London homes - have it inspected or replaced before you use it again. Don't plug it back in and hope for the best.

Tell your insurer

Even if you didn't make a claim, notify your home insurer about the incident. Many policies require you to report electrical faults within a set timeframe. Failing to report can affect your ability to claim later if related damage appears.

Test your smoke alarms

Any electrical fault involving burning or scorching is a prompt to test all smoke alarms in the property. The London Fire Brigade recommends testing alarms weekly. If any alarm is over ten years old, replace it.

Long term

Preventing a repeat starts with understanding the actual condition of your electrical installation - not just the circuit that failed.

Book a periodic inspection

An Electrical Installation Condition Report (EICR) is a full inspection of your wiring, earthing, bonding, and distribution system. For owner-occupied homes, this is recommended every ten years. For rented properties in England, landlords are legally required to carry one out every five years and provide the report to tenants. In London, a typical EICR costs between 150 and 300 pounds for a standard house, depending on the number of circuits and the age of the installation.

Consider upgrading an old consumer unit

If your property still has an older fuse board with rewirable fuses and no RCD protection, upgrading to a modern consumer unit is the single most effective safety improvement you can make. The typical cost in London runs between 500 and 900 pounds, including certification. It's not a minor expense, but it significantly reduces the risk of electrocution and electrical fire.

Don't overload circuits

A high proportion of electrical emergencies in Greater London homes come down to overloading - too many high-draw appliances running on one circuit. Use extension leads with surge protection rather than daisy-chained block adaptors. Be particularly careful in kitchens, where multiple high-wattage appliances often share limited socket positions.

Keep your certificates

Store all electrical certificates - EICs, MEIWCs, and EICRs - in one place with your property documents. If you're buying a home in London, ask the vendor to provide these during conveyancing. Missing certification often signals unlicensed work, which can affect insurance, mortgage valuations, and the cost of future repairs.

Timeline questions

How quickly can an emergency electrician reach me in London?

Most emergency electricians in London aim to attend within one to four hours of a call, though this varies significantly by location and time of day. Central London boroughs typically have more contractors available and shorter response windows. Outer Greater London areas, particularly during evenings and weekends, can see longer waits. Always confirm an estimated arrival time when you call, and ask the contractor to ring ahead if their timing changes.

What electrical faults count as a real emergency?

Burning smells, visible scorch marks, sparking sockets, complete loss of power that isn't a network outage, exposed or damaged wiring, and any electrical fault near a water source all warrant an emergency call-out. A single tripped breaker that resets and stays on is not typically urgent. If it keeps tripping, that changes the picture and you should call a qualified electrician to find the underlying cause rather than continuing to reset it.

Can I reset my fuse box myself?

You can reset a tripped MCB or RCD by flipping it back to the "on" position. If it trips again immediately or won't reset at all, there's an active fault on that circuit and you should leave it off and call an electrician. Do not attempt to replace fuses, open the consumer unit enclosure, or interfere with any wiring yourself. The internal components of a consumer unit remain live even when the main isolator switch is turned off.

Does emergency electrical work in London require a permit?