Public evidence profile

M & M Gas Services Ltd

PlumberSt. Albans5.075 reviews · 1 independent public source
Credentials & registries
3 credentials shown
MCS certification
Certified for Air Source Heat Pump, Water Source Heat Pump
Trust Score
55out of 100
Good record, gaps to check
  • Rated 5.0 from 75 reviews
  • 9 reviews in the last 12 months

Worth checking: WaterSafe

How this score is worked out
Rating5.0 / 5
Review volume75
Independent sources1 independent public source
Credentials3 credentials shown

How this score is made up

What customers say38.9 of 60
Independent checks11.4 of 30
Track record5 of 10
See the independent checks
  • Licences and credentials4.4 of 8.3
  • Ways to reach them7 of 8.3
  • Reviewed on more than one site0 of 6.2
  • Registered company details0 of 4.1
  • Photos of their work0 of 2.1
  • Industry recognition0 of 1

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.

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Trust at a glance

What we can verify about M & M Gas Services Ltd

2 checks

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.

See the full verification checklist for M & M Gas Services Ltd
Reviews · public evidence

What customers say

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
75 reviews in public evidence9 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 Traders75 reviews · 5.0 avg

Highlights

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.

Customer in HertfordshireWhich? Trusted Traders5.0 rating

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.

Customer in Central BedfordshireWhich? Trusted Traders5.0 rating

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.

Customer in HertfordshireWhich? Trusted Traders5.0 rating

Detailed reviews

These are the individual reviews we hold for M & M Gas Services Ltd, including the highlights above. The 75 headline total is the review volume reported across public review sources.

Customer in Hertfordshire5.0 / 5 ·

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.

Which? Trusted Traders
Customer in Central Bedfordshire

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.

Which? Trusted Traders
Customer in Central Bedfordshire5.0 / 5 ·

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.

Which? Trusted Traders
Customer in Hertfordshire5.0 / 5 ·

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.

Which? Trusted Traders
Customer in Hertfordshire5.0 / 5 ·

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.

Which? Trusted Traders
Read the other 15 detailed reviews on this page
Customer in Hertfordshire5.0 / 5 ·

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.

Which? Trusted Traders
Customer in Hertfordshire5.0 / 5 ·

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.

Which? Trusted Traders
Customer in Hertfordshire5.0 / 5 ·

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.

Which? Trusted Traders
Customer in Hertfordshire5.0 / 5 ·

Great service

Great service, flexible, responsive, and reliable. First time fix, when others were unclear on the issue or how to identify the problem.

Which? Trusted Traders
Customer in Hertfordshire5.0 / 5 ·

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!!

Which? Trusted Traders
Customer in Hertfordshire5.0 / 5 ·

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

Which? Trusted Traders
Customer in Hertfordshire5.0 / 5 ·

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.

Which? Trusted Traders
Customer in Hertfordshire5.0 / 5 ·

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.

Which? Trusted Traders
Customer in Hertfordshire5.0 / 5 ·

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,

Which? Trusted Traders
Customer in Hertfordshire5.0 / 5 ·

Efficient, friendly and professional

Excellent service - arrived in good time, completed the work promptly and at a reasonable price. Definitely recommend

Which? Trusted Traders
Customer in Hertfordshire5.0 / 5 ·

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.

Which? Trusted Traders
Customer in Hertfordshire5.0 / 5 ·

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.

Which? Trusted Traders
Customer in Milton Keynes5.0 / 5 ·

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.

Which? Trusted Traders
Customer in Hertfordshire5.0 / 5 ·

Great work

M&M gas services were efficient open and transparent about fixing the air source heat pump. Despite having to go through the original supplier for parts and the frustration and difficulty that brought they remained professional and were able to complete the job. Would happily use them again.

Which? Trusted Traders
Customer in Hertfordshire5.0 / 5 ·

Punctual, friendly, efficient

M&M have helped us out several times over the last few years, including annual boiler servicing and some emergency leaks too! Martin and his colleagues have always been punctual and reliable, friendly and capable. I wouldn't hesitate to recommend this company.

Which? Trusted Traders
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.

From customer reviews

What customers consistently say

Recurring themes from 25 customer reviews on Which? Trusted Traders.

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

3

These credentials and memberships are attributed to named public sources. Check the source before relying on them.

Renewable energy

MCS renewable energy certification

Air Source Heat PumpWater Source Heat Pump

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.

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.

Check dates vary by source. Where we hold a date, the check shows it.

About

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.

Independent checks

About this business

Recently reviewed9 reviews in the last 12 months.
Your own checks

What to check before you hire

Worth checking yourself
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.

Check the WaterSafe register
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.

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Good to know

Common questions about M & M Gas Services Ltd

Is M & M Gas Services Ltd a legitimate business?

M & M Gas Services Ltd has 75 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 75 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 75 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 9 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 3 independently sourced credentials for M & M Gas Services Ltd, including MCS, Which? Trusted Trader, Microgeneration Certification Scheme. Each is attributed to the body that issued it in the credentials section. For example, MCS 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.