We included firms replacing consumer units in Greater London and judged them on five points: response time stated, out-of-hours cover, certification, pricing basis and guarantees. Research was desk-based on 27 October 2026, using company pages, Checkatrade, Companies House and published guides. Response times are company statements, not tested.
Capital Electrician is first as a publisher-selected featured pick. The others are unranked. Speed has limits: an emergency visit can make a board safe, but a full replacement still needs the right unit and testing time.
Comparison at a glance
| # | Company | Strongest fit | Main differentiator | Pricing basis | Consider |
| 1 | Capital Electrician | Quick planned replacement in working hours | Two-hour response, same day where stock allows | Quote after survey; not publicly listed | 18 Google reviews so far |
| 2 | Pimlico Plumbers | Night and weekend emergencies | 24/7 call centre, one-hour target | Estimate within 48 hours | Guarantee on “most” jobs |
| 3 | Fantastic Services | Short-notice booked visits | Published out-of-hours rates | £87 first half hour out of hours | Materials extra |
| 4 | Housekeep | Short-notice online booking | Arrival window given | Hourly; first hour upfront | Board cost added later |
| 5 | Sky Electrical | South-west London | Six-year workmanship warranty | Free estimate; not publicly listed | Response time not stated |
1. Capital Electrician | Our pick for a quick, certified replacement in working hours
Overview
Capital Electrician, trading name of CAPELEC GROUP LTD (company number 17180050), offers consumer unit replacement across Greater London and runs a same-day emergency call-out line. Its page says it typically replies to quote requests within two hours during working hours.
Its page summary mentions same-day fitting where stock allows; the normal process starts with an assessment visit.
Key details
- Core offering: old board removed, metal-clad RCD or RCBO unit fitted
- Coverage: all Greater London boroughs
- Customer fit: homeowners and landlords with a failed or condemned board
- Pricing and terms: quoted after survey; not publicly listed
Where Capital Electrician stands out
It pairs speed with full paperwork. Even quick jobs, it states, end with circuit testing, labelling, an Electrical Installation Certificate and Building Control notification.
What to consider
Same-day fitting depends on stock and the survey. Its review base is 18 Google reviews at 5.0, shown on its site on 27 October 2026, and no guarantee period is stated.
Best fit
Londoners who need a board replaced within days, with certification, during working hours.
2. Pimlico Plumbers | Best for night and weekend emergencies
Overview
Pimlico Plumbers is a London maintenance firm whose electrical team covers emergency repairs, fuse box replacements and tripping circuits in every London borough.
Its emergency service operates around the clock, 365 days a year.
Key details
- Core offering: emergency electrics, board replacement, repairs
- Coverage: London boroughs plus parts of Surrey
- Customer fit: households and businesses
- Pricing and terms: estimate within 48 hours of visit, valid 30 days
Where Pimlico Plumbers stands out
Its London call centre runs 24/7, and it aims to respond to emergencies within an hour, subject to availability. Electricians are NICEIC approved, it states.
What to consider
A planned replacement still follows an estimate, so the emergency visit may only make things safe. The 12-month guarantee covers “most” jobs.
Best fit
Households with no power at night or at the weekend.
3. Fantastic Services | Best for short-notice visits with known rates
Overview
Fantastic Services books trades within the M25 and advertises short-notice and emergency visits for fuse box replacement. Its standard process starts with an inspection.
Out-of-hours rates are published, and an Electrical Installation Certificate is issued on completion.
Key details
- Core offering: inspection, replacement, certificate
- Coverage: within the M25
- Customer fit: households booking online or by app
- Pricing and terms: out of hours £87 first half hour, £75 per half hour; weekday daytime £61 then £49
Where Fantastic Services stands out
You know the urgent rate before booking. Club members get priority booking for a one-off £89 fee.
What to consider
A replacement normally waits for a written quote 48 hours after inspection. Materials and £52-an-hour shopping time are extra.
Best fit
Buyers who need a visit soon and want rates published.
4. Housekeep | Best for short-notice online booking
Overview
Housekeep is a London platform booking NICEIC Approved tradespeople for fuse box repair or replacement. It says it has electricians available for emergency repairs.
You pick a slot and pay the first hour.
Key details
- Core offering: fuse box repair, replacement, fault finding
- Coverage: London regions
- Customer fit: households wanting to book without calls
- Pricing and terms: hourly; first hour upfront
Where Housekeep stands out
Short-notice slots and an arrival window are bookable online. Problems reported within 72 hours are fixed free if its work caused them.
What to consider
Support runs 08:00 to 18:00 on weekdays and to 17:00 at weekends, so it is not a 24/7 line.
Best fit
Households wanting a soon-as-possible slot booked online.
5. Sky Electrical | Best for south-west London buyers who can wait a little
Overview
Sky Electrical Limited is a Twickenham contractor incorporated in 1999 (Companies House). Its Checkatrade profile lists fuseboard installation and repair and mentions a call-out service.
One 2025 review reports a visit within 48 hours of request. Engineers are directly employed and DBS checked, it says.
Key details
- Core offering: fuseboard replacement, repair, rewiring
- Coverage: London and surrounding areas, mainly south-west
- Customer fit: homeowners and businesses
- Pricing and terms: free estimate; not publicly listed
Where Sky Electrical stands out
A six-year workmanship warranty and directly employed engineers make it strong on long-term cover. It has 624 Checkatrade reviews since 2013.
What to consider
No guaranteed response time is published. Its current 9.89/10 uses 12 recent reviews.
Best fit
South-west London buyers who prioritise warranty over same-day speed.
Before you call
- Is it an emergency? Burning smells, scorch marks or a hot board need urgent help.
- Make safe first: a quick visit may isolate a fault before a full replacement.
- Ask about stock: same-day fitting depends on the unit being available.
- Insist on paperwork: speed should not skip the certificate.
FAQs
Can a board be replaced the same day? Sometimes, if the survey is quick and a suitable unit is in stock.
Is out-of-hours work more expensive? Usually. Fantastic Services, for example, charges £87 rather than £61 for the first half hour.
What if the electrician finds faults? Faulty circuits may need repair or temporary disconnection first.
Should I wait for a planned replacement after an emergency visit? If the electrician has made the installation safe, a planned replacement a few days later is often sensible. It gives time to source the right board and test circuits properly.
What should I do while waiting? Leave tripped devices off, avoid resetting a board that smells of burning, and keep the electrician’s report for the replacement quote.
Conclusion
Capital Electrician is our featured pick for Londoners who need a certified replacement quickly during working hours. For a night-time emergency, Pimlico Plumbers’ 24/7 line is better suited, and Sky Electrical offers the longest stated warranty.