Consumer Unit
Consumer Unit Upgrade, Cardiff Bay
Replaced an old fuse board with a modern dual-RCD consumer unit. Notified to building control via NAPIT same day, certificate issued on completion.
NAPIT Certified Electricians · Cardiff & South East Wales
Electricians in Cardiff
You Can Actually Rely On
Domestic, commercial, or industrial work across Cardiff and South East Wales. We show up when we say and charge what we quoted. No call-out surprises.
NAPIT Certified
Same-Day Response
30+ Years Combined Experience
Free Quotes
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Years Combined Experience
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Jobs Completed
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Google Reviews
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Areas Covered
What We Do
Domestic, Commercial & Industrial Electrical Services
Home or business, we do the job right the first time and keep to the schedule we gave you.
Full & Partial Rewires
Old wiring causing problems or failing an EICR? We rewire to the 18th Edition wiring regulations and issue a full Electrical Installation Certificate on completion.
- Full house rewires
- Partial rewires & upgrades
- Kitchen & bathroom circuits
- Installation certificate on completion
Consumer Unit Upgrades
Old fuse board or running out of ways? We replace it with a modern 18th Edition consumer unit with full RCD or RCBO protection and sort the building regs notification.
- Fuse board replacements
- RCD & RCBO protection
- Additional circuit installation
- NAPIT certified & notified
Commercial & Industrial
Schools, offices, warehouses, hospitals, retail units. We know the commercial regs and work around your hours so you're not losing business.
- Single & three-phase installations
- LED lighting fit-outs
- Testing & inspection (EICR)
- Factory & school maintenance
Testing & Inspection
Landlord certificates, pre-purchase surveys, periodic inspection and testing. We report to BS7671 and issue your EICR the same day where possible.
- Domestic & commercial EICR
- Landlord electrical certificates
- Pre-purchase electrical surveys
- Emergency lighting testing
Lighting & Garden Power
Indoor lighting upgrades, LED retrofits, garden lighting, exterior power. We'll plan it out, get your sign-off, then do the install.
- LED lighting installations
- Garden & exterior lighting
- Exterior socket outlets
- Dimmer & smart controls
Smart Home Automation
Smart lighting, heating, security, and home cinema. We advise on Google, Amazon, and Apple systems and handle all the electrical side.
- Smart lighting & heating
- Security cameras & doorbells
- Multi-room audio & AV
- Hub setup & commissioning
Why CMJ
Proper Electricians.
Get a Free Quote
Proper Electricians.
Every Job Certificated.
CMJ Electrical was founded by Chris Jones, who started his career as an apprentice with Cardiff Council before going on to work across domestic, commercial, and industrial sites throughout South Wales. Between our team we have over thirty years of hands-on experience.
We're NAPIT certified, which means our work is independently inspected and notified to your local authority. No cowboy sign-offs. Every job comes with the right paperwork.
We cover all areas of Cardiff: Bay, Canton, Cathays, Cyncoed, Roath, Grangetown, Llandaff, Fairwater and more, as well as Penarth, Barry, Newport and the Vale of Glamorgan.
Upfront pricing. You approve the number before we touch anything
We handle Part P notifications and all the paperwork
Same electrician from quote to completion
All work NAPIT notified and certificated
We clean up before we leave. Every time.
NAPIT Certified
Approved contractor, notified work
Fully Insured
Public liability cover
CSCS, IPAF & PASMA
Accredited for commercial sites
Free Surveys
No-obligation quotes, no call-out fee
Recent Jobs
Work We're Proud Of
A few jobs we finished recently. Nothing staged, nothing stock. Just the work.
LED Lighting
LED Fit-Out, Roath Office Block
Strip-out of old fluorescent fittings across three floors, replaced with LED panels on a presence-detection system. Done over a weekend, no disruption to tenants.
Smart Home
Smart Home Install, Cyncoed
Full smart lighting, heating, and security camera install for a new-build in Cyncoed. Google Nest system integrated throughout, all electrical work NAPIT notified.
Commercial
Warehouse Upgrade, Cardiff Industrial Estate
Three-phase distribution upgrade for a logistics warehouse. New sub-distribution boards, LED high-bay lighting, and full EICR on completion.
Reviews
What Customers Actually Say
We don't cherry-pick. These are from Google. Search us there if you want the full picture.
"Had a strange burning smell coming from a socket late on a Friday night. Called CMJ and someone was at my house within 90 minutes. Fixed the issue, checked the consumer unit and all the circuits, and didn't charge me an arm and a leg for the emergency call. Really impressed."
"Used CMJ for a full consumer unit upgrade on my house in Roath. The electrician walked me through everything before starting, the NAPIT notification was handled the same day, and it passed inspection first time. The work area was cleaner when they left than when they arrived."
"We hired CMJ for the electrical fit-out of our new office. They were on time every day, communicated any changes immediately, and came in under the original estimate. We'll be using them for our second location without question."
100+ Google reviews. See all reviews →
Where We Work
Areas We Cover
Based in Cardiff CF3, covering Cardiff and South East Wales. Click your area for local information.
Common Questions
Questions We Get Asked
Do I need to be at home during the work?
For most jobs, yes. We'll need access to the property and to the consumer unit. For larger jobs like rewires, someone needs to be available or we can agree arrangements for access. We'll confirm what's needed when we do the quote.
How long does a consumer unit upgrade take?
A standard consumer unit replacement on a typical three-bedroom house takes a full day. There will be a period without power while the new board is fitted, usually a few hours. We'll give you a clear time estimate before we start and work to it.
What is an EICR and do I need one?
An EICR (Electrical Installation Condition Report) is a formal inspection and test of a property's electrical installation. Landlords in Wales are legally required to have one every 5 years under the Renting Homes (Wales) Act 2016. Homeowners should have one if the property is more than 25 years old and the wiring hasn't been inspected, or before buying or selling. We carry them out and issue the report the same day where possible.
How quickly can you come out?
For non-urgent jobs, we can usually give you a date within a few days. For faults or urgent issues, call us and we'll do our best to get to you the same day. We're based in Cardiff CF3 so we're close to most of the areas we cover.
Is your work guaranteed?
All our electrical work is NAPIT certified and notified to building control. NAPIT membership requires our work to be independently inspected and to meet the current 18th Edition wiring regulations. Every notifiable job gets the right certification on completion.
Do you charge a call-out fee?
No. We don't charge a call-out fee and quotes are free. You'll get a fixed price before we start. No surprises when the job's done.
Need an Electrician?
Call for a free quote, or send a message and we'll get back to you the same day.
Get In Touch
Tell Us About the Job
Fill out the form and we'll get back to you within the hour. Prefer to just talk? Call or text us directly.
Phone / Text
07789 693725
Email
[email protected]
Based in Cardiff
190 Countisbury Avenue, Cardiff, CF3 5RS
Covering South East Wales
Covering South East Wales
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