Missing evidence lowers the score because we can't check it. It doesn't mean it doesn't exist. Claiming a profile never changes the score. Evidence context, not a guarantee of workmanship.
Each card sums up one thing we can check from public sources. Open it for the full detail and the named source. This is evidence context, not a guarantee.
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5.0out of 5
93 reviews in public evidenceMost recent review
Customers often mention
PunctualMentioned in 29% of reviews we've read
Friendly & politeMentioned in 25% of reviews we've read
ProfessionalMentioned in 25% of reviews we've read
Where these reviews are published
Which? Trusted Traders93 reviews · 5.0 avg
Detailed reviews
These are the individual reviews we hold for Williams Electrics, including the highlights above. The 93 headline total is the review volume reported across public review sources.
Customer in
Customer recommends this business
Professional and helpful
Mark recently fitted new recessed downlights for us, and we were very pleased with the service provided. Mark was professional throughout, clearly knowledgeable, and took the time to offer us additional help and advice. The installation was carried out efficiently and to a high standard, with great attention to detail. We would have no hesitation in recommending his services.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Cardiff
Customer recommends this business
Done - fast, full, and accurate
We had non-functioning electricals - bathroom light fixture and a fan. Mark is local to us, was able to make a near-term plan, showed up as arranged, and did the installation. The fee for parts and labour was reasonable. Should other matters arise, we would ring him.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Cardiff
Customer recommends this business
Good work by Trusted Trader
Mark came to do several jobs just 5 days from our request. Very good advice given and then work carried out to high standard. Reasonable charge without any call-out charge added. We found Mark on Trusted Trader, so it shows how useful it can be.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Cardiff
Customer recommends this business
Great experience upgrading consumer unit
We were recommended to Mark by a neighbour, and he has been helpful and courteous from our first interaction. We needed the consumer unit in our house upgraded, and Mark helped us understand the requirements and work with national grid ahead of the installation. On the day, Mark kept us informed of progress - finishing the work on time and to a high standard, all while also answering my many questions!
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Caerdydd
Customer recommends this business
Updating Flat electrics Cardiff
Finding a good, reasonably priced electrician is a nightmare. Williams Electrical was a wonderful find. Mark visited to assess the work, he gave me a time and materials guide price and followed it up with a written estimate promptly. We agreed on a time to do the works and he communicated well when he had to make a small rearrangement to the timing. He was personally charming and someone one feels happy to have in your property. The work was done as described and in good spirit on time. He is tidy in his work and disrupted me as little as possible. The work was completed, and an invoice itemising materials and labour costs in detail was issued to me within 24 hours. He forwarded the electrical certificate and Building control notice immediately. It felt like a very professional service all round, and he is a pleasure to have around. I have no reservations in recommending him, and he will undertake other works for me. The first tranche of work inc new updated consumer unit (fuse box), adding plug outlets, and earthing to gas and water supplies. His pricing is sensible and good value.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Read the other 15 detailed reviews on this pageShow fewer reviews
Customer in Cardiff
Customer recommends this business
Great Work (as usual) - Would highly recommend
Great Work (as usual) - Would highly recommend Over the years, we have requested Mark's services many times. Each time, we have been impressed with his prompt, efficient, no-faff expertise. He is always reliable and prices are very reasonable. He is clearly very knowledgeable and takes the time to explain things clearly to customers (which is very helpful for people like me who know little about electrics). Even though we initially called Mark for 1 issue, he ended up solving 3 separate issues.... all within 24 hours of contacting him. Thanks again Mark!
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Cardiff
Customer recommends this business
Fire Alarms fitted efficiently and quickly
This is the second time Mark has done work for us. This time he sourced and installed new fire alarms throughout the house. He was punctual, efficient and the price was very fair. I would highly recommend him to others- he's a thoroughly nice man, very straightforward to deal with and completely reliable.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Cardiff
Customer recommends this business
Reliable & Courteous Electrician
Mark did electrical work at both my house and my mum’s house. This is the second time I have used Mark for electrical work. He is reliable and polite and completes the work in a timely manner. He provides advice on best lighting / solutions. He purchased the lighting fitments on my behalf (saving me time & effort working out the best option). Reasonably priced. I would recommend Mark and will use him again in the future.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Caerdydd
Customer recommends this business
Great work.
I recently contacted Mark for the first time to remove two ceiling lights and install two new ones. He arrived on time on the day agreed. He worked quietly and efficiently to do the work. A problem was detected with an existing dimmer switch for one of the new lights. Luckily I had a replacement light switch in the house , which Mark was able to install with no problems. All the work was completed and I am very happy with work. I would have no hesitation in using Mark for any other electrical work.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Cardiff
Customer recommends this business
Precise & Professional
Mark was able to fit a new socket and change another with very short notice. All options and steps were described to us and the work was carried out to a high standard and with no mess.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Cardiff
Customer recommends this business
Works quietly and diligently and solves problems
We have used Mark before as Electrician of choice. On this occasion we needed some sockets repositioned, some sockets installed where there were no existing sockets, and electrical leads resting on top of the kitchen cabinets needed to be tidied up. In addition, we needed Mark to track down why one particular electrical circuit which powered the garage, tripped on an infrequent basis. This was a particularly difficult task because at times the circuit would trip, meaning there was no way to access the garage. If only the garage had an entrance from the house, or from the garden we would have been able to get into the garage. In the end, Mark dismantled some of the overhead door and was able to detach the garage door motor to enable the door to be opened manually. Once inside the garage, Mark was able to rectify the problem. Mark can be relied upon to work quietly and diligently, and keeps the customer advised throughout.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Cardiff
Customer recommends this business
Excellent and professional
We had no electricity in our kitchen, especially fridge and freezer , and in our dinning room. Mark found out the problem and managed to fix everything. It was not easy as we live in an old house. Mark was very patient, explained what he was doing and job done. 👍 We are very grateful and pleased with his service. We will definitely call him again , and definitely recommend him to everyone that we know.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Cardiff
Customer recommends this business
An efficient and professional service
Mark came to repair two malfunctioning lights at our home. He arrived promptly and was courteous and thorough, explaining the problems, and what he intended to do, which he did speedily. His charges were most reasonable, and I heartily recommend him to anyone looking for an excellent electrician in the Cardiff area.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Cardiff
Customer recommends this business
Excellent service
Excellent service. Work was explained carefully and carried out efficiently. Parts were available quickly and nothing was too much trouble.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Caerdydd
Customer recommends this business
Hat Trick of Successful Visits
This was the third occasion we have called upon Mark, and it was every bit as successful as the previous visits. He fitted a new double plug socket for which he provided an electrical certificate, installed a heat alarm, and diagnosed and fixed a problem with our cooker hood. Mark always explains what he proposes to do before starting, and his charges are very reasonable.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Cardiff
Customer recommends this business
Highly Recommended
Professional, trustworthy and thorough. Mark came out at short notice to diagnose a tricky problem with our domestic electrics and was determined to fix the issue, which he did successfully in very little time at all. Replaced two sections of wiring and got our downstairs socket circuit back up and running. Will definitely contact him again if we require any further electrical work, and will recommend him to everyone we know locally!
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Cardiff
Customer recommends this business
Excellent Service
Mark fitted a PIR light by our front door. He arrived promptly, did a great job and was a pleasure to deal with. I will definitely use him again for any electrical work and would recommend him to my friends.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Cardiff
Customer recommends this business
Expert Electrical Engineer
He is an expert electrical engineer who can solve any electrical problem. Fixed two fiddly problems for me. Great work from a master in his field.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Cardiff
Customer recommends this business
Good job done
We asked Mark to fit an induction hob where a gas hob had been. The work turned out to be non-trivial and needed difficult cutting of the worktop. He worked away diligently - it took him about four hours to complete the fitting. He was concerned to get things right, such as fitting an isolation switch for the oven that is fed by the same cable as the hob. We were very pleasantly surprised at how reasonable the cost was. We propose to use him if we need other electrical work done.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Cardiff
Customer recommends this business
Highly recommended
I have used Mark since 2018 and will continue to do so (he is trustworthy knowledgeable and professional) for all electrical work e.g Creating extra sockets (other electrician quotes said couldn’t be done) but Mark said can be done Extra spotlights fitted Double outside electric socket fitted. He has recently done work on my daughter's new property New bathroom light fitting after his advice on what to go with Fitted upgraded electric wall heaters, a fabulous job done so pleased. 5* service advice. No job is too big or small. Thank you again
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Local context
Rated 5.0, above the local average for electricians in Cardiff
Across 79 electricians in Cardiff, the typical rating is 4.9 out of 5. We compare against the same businesses a homeowner would find searching for this trade locally.
03
From customer reviews
What customers consistently say
Recurring themes from 25 customer reviews on Which? Trusted Traders.
Respectful and tidy in your home: “cleared up after the work was finished” · Which? Trusted Traders, 25 Sept 2024
Clear communicationQuoted from 2 reviews
“Mark kept us informed of progress” · Which? Trusted Traders, 8 Feb 2026
“His communication from the start was exemplary” · Which? Trusted Traders, 28 Nov 2024
Credentials and associations
Credentials and memberships
1
These credentials and memberships are attributed to named public sources. Check the source before relying on them.
Which? Trusted TraderListed, current status not shown
These sources do not label every image as completed work. The gallery may include projects, people, logos or certificates, so it does not count as completed-work evidence.
From Which? Trusted Traders
Opening hours
The hours this business publishes online, handy for knowing when to call. Confirm before you set off.
Monday–Friday
8am–6pm
04
Sources
Where this information comes from
1 named public source
Everything on this page is drawn from named public sources. Where a source provides a public link, you can open the original and dig deeper.
Based in Cardiff, Williams Electrics provides electrical services to domestic and industrial clients throughout Cardiff and the surrounding areas. Although only established in 2009, the staff have many years of experience in the electrical/electronic industry. Williams Electrics - all aspects of domestic, industrial electrical work, including replacement consumer units (fuse boards), house re-wiring, installing/changing light fixtures, additional sockets, external lighting, installation of power to garages and shed. Please call to discuss the electrical work you need carried out in your home.
Services they list
Electrical installationsElectrical testing servicesOutdoor lightingLED lightingLighting LED upgradesdesign and rewire of control panelsexternal lighting
Listed on public sources or the business's own website; check directly that they cover your job before you book.
Their public evidence comes from a single source. Look them up on another site before deciding.
Verify at the sourceCheck them yourself
Electrical work in homes in England & Wales should be done by a registered competent person who can self-certify it meets the Part P safety rules. Check they're on the official register.
In England and Wales, notifiable electrical work (new circuits, a consumer unit, anything in a bathroom or kitchen) must by law be signed off under Part P of the Building Regulations. Confirm they will handle that.
✓
Prefer an electrician registered with a government-approved competent-person scheme (NICEIC, NAPIT or ELECSA) so they can self-certify the work meets the wiring regulations.
✓
Insist on the Electrical Installation Certificate (or Minor Works Certificate) when the job is done. It is your proof the work is safe and compliant, and you will need it if you ever sell.
Want an extra legitimacy check? Run the Cowboy Checker on Williams Electrics before you contact them.
Williams Electrics has 93 independent public reviews, rated 5 out of 5. This is independent public evidence gathered from named public sources (no ads, no paid placement), not a guarantee of workmanship. If anything here is out of date, the business can request a correction.
What do customers say about Williams Electrics?
Williams Electrics has 93 public reviews, averaging 5 out of 5. You can read the individual reviews and where each came from in the reviews section above.
How do I know Williams Electrics' reviews are genuine?
Williams Electrics' 93 public reviews come from a named public review source, and MyTrustedTraders links every one back to where it was published, so you can open the source and read them yourself rather than trusting a single curated page. MyTrustedTraders brings this public evidence together with no ads and no paid placement: we show where every review came from rather than selling rankings, so you can weigh the evidence for yourself.
Is Williams Electrics qualified and accredited?
We hold 1 independently sourced credential for Williams Electrics, including Which? Trusted Trader. Each is attributed to the body that issued it in the credentials section. For example, Which? Trusted Trader is Which? Trusted Trader: an endorsement from the consumer champion Which?, given to traders who pass its assessment process.
What does Williams Electrics specialise in?
Williams Electrics lists specialist services including Electrical installations, Electrical testing services, Outdoor lighting, LED lighting, Lighting LED upgrades, design and rewire of control panels. If your job is one of these, look for it in their listed services or ask them to confirm for your project.
These describe public evidence MyTrustedTraders held at the stated dates. They are not independent awards, they cannot be bought, and they do not change this business's Trust Score or search position. How milestones are measured
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