Full Electrical Rewiring In London

Diligent Electrical Contractors is your trusted electrician in London.

NICEIC & Part P certified

25 years of experience

Commercial & Residential cover

Electrical Rewiring Services Across London
Domestic & Commercial

Got an old building in London that’s struggling with modern electrical demands? You’re not alone. From Victorian terraces in West Norwood to 1960s office blocks in the City, many properties still run on electrical systems that predate the internet age.

Our NICEIC registered electricians work across all London boroughs, handling both domestic and commercial electrical rewiring including Wimbledon, Dulwich, Brixton, Streatham, Crystal Palace, Croydon, Purley, Sutton, Norwood and surrounding areas. Whether it’s a family home , a shop, or an office building, our team brings up to 25 years of experience to every project.

You’ll get the same quality service we’ve done for London Underground, the Metropolitan Police, and major housing associations. We know London properties inside and out. Free quotes arrive within 24 hours, and we’ll tell you exactly what needs doing – no surprises, no hidden costs.

What Is Full Electrical Rewiring?

Full electrical rewiring means replacing every cable, socket, switch, and consumer unit in your property. We strip out old rubber or fabric cables and install new PVC cables that meet BS7671 regulations. Consumer units get upgraded to include RCD protection and modern circuit breakers. Here’s what happens during a complete rewire:

New cable installation runs through walls, under floors, and in ceiling spaces.
Socket and switch replacement brings everything up to current building regulations.
Consumer unit upgrade adds RCD protection and surge protection devices.
Full electrical testing confirms everything works safely.
Electrical installation certificate proves the work meets Part P building regulations.

Most properties need rewiring every 25-30 years. Buildings constructed before 1990 often need updating to handle modern electrical demands. Your new system will support everything from electric car chargers to smart building technology.
Domestic rewiring takes 2-3 days for a small flat, up to 7-10 days for a large house. Commercial projects vary from days to weeks, depending on size and complexity. We work around you and minimise disruption to homes and businesses.

Signs Your Property Needs Rewiring

Old wiring types

Old wiring types tell the story immediately. Black rubber cables, fabric-covered wiring, or lead sheathing mean your system predates modern safety standards. Round light switches and wooden consumer units with rewirable fuses scream 1960s technology.

Performance problems

Performance problems happen daily in old systems. Circuit breakers trip constantly. Fuses blow when you plug in equipment. You get mild electric shocks from light switches. Sockets feel warm to touch. Extension leads snake across rooms because you don’t have enough outlets.

Visual warning signs

Visual warning signs appear around electrical fittings. Burn marks around sockets show overheating. Discolored switch plates indicate sparking behind the wall. Crackling or buzzing sounds from the consumer unit mean loose connections.

Age matters

Age matters more than you think. Properties built before 1980 likely need rewiring. The 1960s and 70s saw some questionable electrical work. DIY alterations from previous owners often create safety hazards.

Insurance and compliance issues

Insurance and compliance issues can force your hand. Some insurers won’t cover properties with old wiring. Mortgage surveys flag electrical problems. Commercial property owners must meet stricter safety standards. Rental property landlords need EICR certificates.

What's Included in Our Quotes

First fix work includes all cable installation, consumer unit positioning, and circuit design.

Second fix work covers socket and switch installation, light fitting connections, and appliance circuits.

Three-phase installation for commercial properties needing heavy machinery power.

Full testing confirms everything meets BS7671 standards.

Certification includes your electrical installation certificate and building regulations notification.

Free quotes arrive within 24 hours. We'll visit your property, assess the work, and give you a fixed price.

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Why Trust Diligent's Full Electrical Rewiring in London?

We’ve rewired hundreds of London properties – from Victorian terraces to modern office blocks. Each project teaches us something new. Here’s why customers keep recommending us:

Fully Qualified and Insured

We’re NICEIC-approved, hold full insurance, and follow the latest UK regulations.

Fast Quotes, Transparent Pricing

No surprises. Get a clear quote and timeline before we begin any job.

Commercial and Residential Projects

From small domestic jobs to corporate electrical services in London, we handle them all.

Whether you’re a landlord needing regular inspections or a homeowner planning a full rewire, our team offers a practical, no-nonsense service backed by real expertise.

Worked for Hundreds of Satisfied Customers

Diligent Electrical Contractors

5.0

Based on 51 reviews

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   Jenny Clarke 
 
 
 
  Chose Diligent Electricals because of excellent reviews. I was not disappointed. Ishmael came at short notice for a trip switch issue. Excellent service, very professional, friendly and informative. Will definitely use again.
  
 
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   Barney Woodbridge 
 
 
 
  Have used DEC twice in the past couple of months - great service, communication and both jobs completely extremely quickly. Don’t need to look anywhere else for an electrician in the area (live around Gipsy Hill station!)
  
 
      Posted on Google  
   
   Monica Fyfe 
 
 
 
  Have used Diligent a handful of times now. Ishmael has always been  professional, reliable and we feel reasonably priced. Highly recommend  and we will continue to use!
  
 
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   Tony Gough 
 
 
 
  Ishmael and Russel connected our garden room to the mains, with lighting, sockets, outside light and external power point. In the house they installed 4 additional sockets and a porch light, and replaced the bathroom light. They worked hard and completed everything in a day. I am confident that the work complies with the regulations. Their quote was very reasonable. Recommended, especially if you want work carried out promptly and efficiently.
  
 
      Posted on Google  
   
   Daniel 
 
 
 
  Ishmael assessed the job, gave good advice, had expert knowledge and completed the job to a high standard for a good price. I recommend his work
  
 
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   Anna Lubelska 
 
 
 
  Very efficient and professional. I’m a satisfied customer!
  
 
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   Emma Turner 
 
 
 
  Fantastic service, prompt response, diligent approach - respectful and professional. Problem identified, solved, rectified and concluded within a short time frame. Would be happy to recommend based on my experiences.
  
 
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   Niall McDonald 
 
 
 
  Excellent service from start to finish. Ishmael came out to inspect and fix an issue with our fuse box very quickly and diligently. His communication was excellent throughout. A seamless experience, would recommend.
  
 
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   David Pribil 
 
 
 
  Ishmael was professional, efficient, and a pleasure to work with. Excellent service and highly recommended!
  
 
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   Jack Stookes 
 
 
 
  Very impressed with the service provided by Diligent Electrical Contractors! Ishmael was friendly, super helpful and fitted our new bathroom extractor fan quickly and efficiently. Would definitely recommend!