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.
These reviews are published independently on the named public source below, not testimonials this business chose to show. We bring them together and link each one back to where it appeared, so you can open the source and read it yourself.
5.0out of 5
78 reviews in public evidence8 reviews in the last 12 monthsMost recent review
Customers often mention
Friendly & politeMentioned in 52% of reviews we've read
PunctualMentioned in 40% of reviews we've read
Fast & efficientMentioned in 28% of reviews we've read
Where these reviews are published
Which? Trusted Traders78 reviews · 5.0 avg
Detailed reviews
These are the individual reviews we hold for M & M Gas Services Ltd, including the highlights above. The 78 headline total is the review volume reported across public review sources.
Customer in Milton Keynes
Customer recommends this business
Highly skilled, highly professional team - heat-pump and bathroom
From his initial scoping visit to the completion of the work, Shaun and his team were fantastic both with the heat-pump work and the bathroom refurbishment. Having just moved into our new home, a very quirky wood-built house, we wanted to move on from a gas to a heat-pump system. We didn't know any trades in the area so were nervous about who to choose. Shaun's visit reassured us - not just his obvious technical knowledge, but also his ability to look for solutions to potential problems. At the same time we drew his attention to our bathroom, which was in urgent need of refurbishment, something that his firm was well placed to sort out. Both jobs were completed over a period of three and a half weeks, though Shaun had been working for some time prior on the technical aspects of the heating system to ensure maximum efficiency, and we couldn't be more satisfied with the outcomes. The bathroom was totally refurbished - tiles, floor and all the sanitary installations - and looks great and, importantly, fully functioning. The heat-pump system was obviously more complex entailing new radiators as well as the pump and water cylinder. That work required a lot of problem-solving due to the nature of our house, all of which the team took in their stride with humour and skill. We have no hesitation in strongly recommending Shaun and his team. Their positive attitude and cheerfulness, even when encountering a problem, ensured that we were fully informed and comfortable throughout.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Greater London
Customer recommends this business
Up to and above British standards
Shaun and his team did a truly excellent job installing a new hot water system and boiler in our Victorian property. They were joys to have around the house for a few days. Thank you so much indeed.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
Shaun from M&M Gas Services is fantastic !
We have a newly built house (2025) with underfloor heating and a heat-pump, which has never worked correctly. Shaun was asked to look at the system by our builders and he diagnosed the wrong size pipework had been installed to the heating manifolds. He spent 4 days here with his team and replaced the originally installed pipes to the correct size. We now have a lovely warm house, first time in 12 months. Shaun has been amazing the whole way through, his knowledge of this new heat-pump technology is outstanding. His advice and support has been fantastic, considering the original instal was nothing to do with his company. If you are looking at installing a Heat-Pump system, I would 100% recommend using M&M Gas, Shaun really knows everything there is to know about them. Thanks you Shaun and M&M Gas.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Central Bedfordshire
Customer recommends this business
Great installation of new heating system
We were having a heat pump system put in to replace our old storage heaters. Shaun talked us threw the whole system in easy to understand language. He turned up on time to all the preliminary meetings and patiently answered our questions. The team turned up on time to start the work and were polite and friendly. The job was finished in a week and we were left with just a small amount of decorating where two old heaters were. They double checked that we were ok with the sighting of the rads and water tank before fitting The neatness of the work was excellent with the minimum of pipework on show. Totally professional and felt comfortable with the team in our house. Highly recommend them and will definitely use them for our servicing.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Central Bedfordshire
Customer recommends this business
ASHP not heating.
Heat pump failed to deliver hot water to underfloor heating system during a very cold week. Contacted M&M and spoke with Shaun who more or less diagnosed problem over the phone. He arrived the next morning and within fifteen minutes had confirmed the diagnosis and rectified the problem. Excellent, friendly and efficient service thoroughly recommend this company.
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 Hertfordshire
Customer recommends this business
Excellent
Highly recommended. We wanted to add our underfloor heating under hive app control. British Gas engineers has tried and failed. Shaun and Darren did the job. No hassle or problems. Considerate and friendly.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
Quick, reliable and friendly at a good price
Excellent service. Very happy customer. Martin and Jack were very quick to respond to install my new boiler, very pleasant, helpful and professional to deal with and I'd strongly recommend them.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
Usual High Quality Service
This is the third year running I have used M&M for my annual boiler service. As per the previous two years, the work was done very effectively and efficiently with absolute minimal disruption. The engineer ( a new employee) turned up exactly on time and carried out the work with a smile, and was very sociable. Would not hesitate recommending M&M.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
Excellent service
I had a problem with my gas boiler and called M&M. I was immediately impressed with the service I received and the prompt response. Having decided to replace the old boiler, Sean was able to give me an instant quote for a replacement, plus a replacement pump and thermostat, and new taps in the downstairs toilet. Having agreed on the quote, the work was carried out very quickly to a very high standard. During the whole process, I was impressed with the business-like but friendly attitude, and they gave me confidence in their experience and knowledge. Will definitely use again and highly recommend.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
Highly Recommended
Easy to arrange for them to come and assess the issue. They were polite, friendly, efficient, and knowledgeable. Would definitely use this company again.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
Great service
Great service, flexible, responsive, and reliable. First time fix, when others were unclear on the issue or how to identify the problem.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
Emergency Call out no heating
I have had several plumbers in the past, and many have retired or moved away. Found M&M lived just around the corner from me, so gave them a try. Called at mine on his way home and identified the problem. Great service. Made arrangements to get parts, and one of the team called to fix the problem. Will now be on my list for any future problems and will recommend them to others. Prompt and friendly service, well done!!
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
Quick response and great service
We woke up to cold water and Sean came very promptly and diagnosed a blocked filter in the boiler (which was easily sorted) but warned that this was a quick fix and we would also need two new motorised valves. He gave us an estimate and scheduled the repair, which was carried out quickly and efficiently by his team. It didn't go completely smoothly, but we were particularly impressed by the speed of Sean's response to the issues that emerged on two occasions until the system was running properly. We have used M&M for different jobs over several years now and would thoroughly recommend them
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
Leaking Rad
Thermostatic valve was changed, no more leaks. I have dealt with Martin from M&M for a few years now, I find him to be friendly and helpful. Will continue to use when needed.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
Bathroom taps replaced
Taps in the bathroom sink needed to be replaced. Piero came on time, disconnected the water and replaced the taps, then resumed the supply. All done quickly and efficiently for the agreed charge.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
Installation of hot water tank and fitting of shower pump
M&M Services install a new hot water tank and a shower pump I must strongly recommend them they were the right price I believe very helpful and most friendly I would use them again excellent service,
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
Efficient, friendly and professional
Excellent service - arrived in good time, completed the work promptly and at a reasonable price. Definitely recommend
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
Underfloor heating repair
We have had an issue with our underfloor heating for a long time and after several different plumbers and many hours work, 2 new motors and a new manifold later it was still not functioning how it used to. Shaun was friendly and professional and quickly got to work assuring us that he would get to the bottom of it, which he did and very quickly! Shaun was the only plumber who picked up that there was a blockage in the pipe that was restricting the heating from working properly, this was then cleared and the heating was working properly once again! He checked we were happy with it after 24 hours and all is still working and warmer than it has been for a very long time! I highly recommend M&M gas services and we will certainly not need to look anywhere else again for plumbing issues.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
Repair to Central Heating System
In 2022 Martin installed a new boiler for us in our old heating system and has carried out a maintenance service each year. We recently experienced a system failure resulting in the boiler not following the programme and shutting down. On making an early morning phone call we discovered that Martin was sick in bed but he advised us how to manage the situation without loosing heating until he could get an engineer out later that day. It was discovered that a motorised valve had failed in the old system and this was replaced first thing next day. Under the circumstances a first class service.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Milton Keynes
Customer recommends this business
M & M Gas services Ltd
M&M has carried out a number of projects over the past 10 years including a particularly demanding one which involved moving our boiler and hot water system into the roof space. They also carry out our regular boiler servicing at our property, and, our business properties, and some emergencies. Martin, Shaun and colleagues have always been punctual and reliable, friendly and capable. I highly recommend this company.
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 plumbers in St. Albans
Across 28 plumbers in St. Albans, the typical rating is 4.8 out of 5. We compare against the same businesses a homeowner would find searching for this trade locally.
02
From customer reviews
What customers consistently say
Recurring themes from 25 customer reviews on Which? Trusted Traders. Analysis updated 14 Jul 2026.
Quality of the workQuoted from 3 reviews
“We now have a lovely warm house, first time in 12 months.” · Which? Trusted Traders, 17 Mar 2026
“the work was carried out very quickly to a very high standard.” · Which? Trusted Traders, 25 Jul 2025
“Shaun was the only plumber who picked up that there was a blockage in the pipe” · Which? Trusted Traders, 7 Dec 2024
Credentials and checks
Credentials, licences and vetting
Credentials and associations
Credentials and memberships
2
These credentials and memberships are attributed to named public sources. Check the source before relying on them.
Microgeneration Certification SchemeListed, current status not shown
Eligible for the Boiler Upgrade Scheme grant (up to £7,500 towards a heat pump or biomass boiler).
Certificate APH-47491, checked by APHC.
Areas covered: Eastern, South East.
MCS is the government-recognised certification for renewable-energy installers, required to claim the Boiler Upgrade Scheme grant. It confirms what they're certified to install, not a review or a guarantee.
Source-listed gallery
Photos listed on Which? Trusted Traders
4 photos
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.
Unvented installation
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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–5pm
Saturday
8am–12pm
03
Sources
Where this information comes from
2 named public sources
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.
We are a family run business based in st.albans, with over 30 years experience. We cover anything from a dripping tap, to full plumbing and heating systems. We are gas safe registered. We pride ourselves on our levels of service and quality of work.
Services they list
Underfloor heatingBoiler installationBoiler servicingGas safety testing and inspectionBoiler repairPower flushingRadiators and central heatingGas cooker installationImmersion HeatersGas fire repair and servicingGas emergenciesBathroom refurbishment
Listed on public sources or the business's own website; check directly that they cover your job before you book.
These are statements the business makes on its own website, worth confirming in writing (and on the official registers) before you hire, not independently verified by us.
Their public evidence comes from a single source. Look them up on another site before deciding.
Verify at the sourceCheck them yourself
Approved plumbers on the free WaterSafe register are vetted, qualified to the water regulations and insured. Check they're listed, or find a WaterSafe-approved plumber near you.
Agree the call-out fee, the hourly or fixed rate, and whether parts are charged on top, in writing, before an emergency plumber starts. Out-of-hours overcharging and 'while I'm here' add-ons are common complaints.
✓
Be wary of a plumber who, on a first visit, says your whole system or boiler must be replaced. Get a second opinion and an itemised quote (parts and labour separately) before agreeing to major work.
✓
Gas and boiler work is a separate, regulated trade, not general plumbing. Make sure anyone working on a gas appliance is specifically registered to do gas work, and ask to see that registration before they start.
Want an extra legitimacy check? Run the Cowboy Checker on M & M Gas Services Ltd before you contact them.
M & M Gas Services Ltd has 78 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 M & M Gas Services Ltd?
M & M Gas Services Ltd has 78 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 M & M Gas Services Ltd's reviews are genuine?
M & M Gas Services Ltd's 78 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.
Has M & M Gas Services Ltd had recent public reviews?
M & M Gas Services Ltd has 8 public reviews dated within the last 12 months. That shows their review history includes recent feedback; it does not prove current availability, so confirm capacity before hiring.
Is M & M Gas Services Ltd qualified and accredited?
We hold 2 independently sourced credentials for M & M Gas Services Ltd, including Microgeneration Certification Scheme, Which? Trusted Traders. Each is attributed to the body that issued it in the credentials section. For example, Microgeneration Certification Scheme is the government-backed standard for renewable-energy installers (heat pumps, solar), and what unlocks grants like the Boiler Upgrade Scheme.
Is M & M Gas Services Ltd MCS-certified for renewable energy?
M & M Gas Services Ltd is MCS-certified for Air Source Heat Pump, Water Source Heat Pump. MCS is the government-recognised certification for renewable-energy installers, and is what lets them claim the Boiler Upgrade Scheme grant towards a heat pump or biomass boiler. It confirms what they are certified to install, not a review or a guarantee.
What does M & M Gas Services Ltd specialise in?
M & M Gas Services Ltd lists specialist services including Underfloor heating, Boiler installation, Boiler servicing, Gas safety testing and inspection, Boiler repair, Power flushing. If your job is one of these, look for it in their listed services or ask them to confirm for your project.
What areas does M & M Gas Services Ltd cover?
They state on their own website that they cover St. Albans, London Colney, Hemel Hempstead, Bricket Wood, Hatfield. This is the business's own statement on their website, not something we have independently checked. Confirm they cover your postcode before booking.
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