I built a passive house. 21 degrees, fitted the windows and doors, and designed and supplied the MVHR system. These are two different teams, but in both cases, the experience with working with 21 degr... Toon meer
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21 degrees installed my solar system and were great. A year later mice ate some cables and the sent someone out to fix my system within a couple of days which was great service too
Bedrijf heeft geantwoord
Very happy with my experience with 21 degrees - the solar panel setup is working really well for us. They were a pleasure to work with and made it easy to move through the process. The only caveat is... Toon meer
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Knowledgeable and keen staff. Fitting triple-glazed windows for the whole house, and they all wanted to get the job done, and didn't look for excuses when things got difficult. I would say the only t... Toon meer
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Bedrijfsgegevens
Geschreven door het bedrijf
Our world is changing. We believe now is the time to adapt and so we're pioneering a new future. Our mission is to empower homeowners, architects, and businesses with the knowledge and technology to harness their own sustainable energy and help safeguard the planet. Whether you need a single product or the ultimate Passivhaus, your system needs to be well thought out and designed correctly. We adopt a full-circle approach to provide better performing buildings from a carbon, cost, and comfort perspective to get you the right outcome. Our specialist products and services include renewables such as solar panels and heat pumps, and energy efficient upgrades such as triple-glazed windows and doors, mechanical ventilation with heat recovery (MVHR) systems, and insulation and airtightness products.
Contactgegevens
Verenigd Koninkrijk
- 0808 281 5021
- info@21degrees.com
- 21degrees.com
4,4
Uitstekend
118 reviews
Heeft 83% van zijn negatieve reviews beantwoord
Reageert doorgaans binnen 48 uur
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A professional and friendly company
Always a great personal and professional experience. They are both knowledgeable and friendly in every aspect of the job from quotation to completion.
I would always go back for any further improvements to my green home knowing they have my best interest at heart.
15 oktober 2025
Review zonder uitnodiging
Antwoord van 21 Degrees
Thank you for your review!
We are thrilled to hear that you consistently have a great personal and professional experience with our team.
We appreciate your loyalty and look forward to serving you again soon.
⭕ The 21 Degrees Team.
3 phase battery install needed
3 phase battery install needed. The surveyor was excellent, went through the options, benefits and drawbacks for differing systems. Once we had decided on the Sig Energy system, the only delay was getting permissions from the relevant regulators.
Installation was trouble free and, despite being in a busy part of the house we hardly knew they were there. Had one small hiccup with a solar inverter but they stayed on site and put that right. Siting of the battery had been carefully considered by the surveyor and my fear that we would be stuck with a battery outside the front of the house did not happen as it is discreetly placed under a carport.
The control app from sig needs setting up although most of that was done in the commissioning by 21 Degrees but once set, it just gets on with it!
We have already seen savings on our electricity costs and this bodes well for the use of our new heat pumps (also 21 degrees).
A very neat and tidy job. I have no hesitation in recommending this company.
6 oktober 2025
Review zonder uitnodiging
Antwoord van 21 Degrees
Dear Mr. Satterford,
Thank you so much for taking the time to leave such a detailed and positive 5-star review!
It's fantastic to know that our surveyor provided a thorough consultation on the different systems, helping you feel confident in your decision to go with the Sig Energy system.
We're especially pleased that the installation was trouble-free and our team's tidiness and discretion made the process smooth.
It's great that you're already seeing savings on your electricity costs and that the system is working well alongside your new heat pumps.
Thank you again for your high recommendation. We wish you many years of energy savings!
⭕ The 21 Degrees Team
Service great, booking a little trickier than needed
Service of Heat pump was great. Once pointed at the online booking form as easy but finding that was not straight forward
1 oktober 2025
Review zonder uitnodiging
Antwoord van 21 Degrees
Thank you for your feedback and for taking the time to leave a review!
We appreciate your comments about the booking process, your input is very helpful.
Thanks again for choosing 21 Degrees!
⭕ The 21 Degrees Team.
thorough and efficient service
thorough and efficient service with good, technical conversations about several aspects of the system.
and we finally got the seeping joint in the airing cupboard fixed!
22 oktober 2025
Review zonder uitnodiging
Antwoord van 21 Degrees
Thanks so much for the great review and 5 stars!
We're happy the service was thorough and efficient, and especially glad to hear that seeping joint is finally fixed!
⭕ The 21 Degrees Team.
Knowledgeable Engineer
Knowledgeable, efficient and congenial engineer. Overall a very satisfactory experience albeit rather expensive
14 oktober 2025
Review zonder uitnodiging
Antwoord van 21 Degrees
Hi Martyn,
Thank you so much for taking the time to leave us a 5-star review.
We also appreciate your honest feedback on the price. We are committed to using superior-quality products and providing a level of specialist knowledge that ensures our systems are designed and installed for optimal, long-term performance and comfort.
Thank you for choosing us.
⭕ The 21 Degrees Team.
21 Degrees home Solar and Battery installation
21 Degrees recently installed solar panels and a battery system for us. The work was undertaken diligently and to a very high standard by two of the companies technicians, and the finished install looks extremely neat, and is working effectively.
The whole process from start to finish was streamlined and efficient.
Great work by everyone involved at 21 Degrees.
7 oktober 2025
Review zonder uitnodiging
Antwoord van 21 Degrees
Thank you so much for your kind feedback! We’re delighted to hear that you’re pleased with your new solar and battery system, and that the installation team delivered to our usual high standards. It’s great to know the system is already working effectively for you.
We really appreciate you taking the time to share your experience - we'll make sure to pass your comments on to the team.
Best wishes,
⭕ The 21 Degrees Team
Heat pump service
Richard was very thorough and professional.would like to request him next year for my service of the heat pump .He was very informative and helpful he was very knowledgeable very pleased
10 oktober 2025
Review zonder uitnodiging
Antwoord van 21 Degrees
Dear Diane,
Thank you so much for taking the time to leave such a wonderful review. We are delighted to hear that you were pleased with your recent heat pump service.
We'll be sure to pass your kind words on to Richard.
Best regards,
⭕ The 21 Degrees Team
Excellent trustworthy service
I already know Pete, as he was involved with much of my installation work. A great guy to deal with, very consciences, knowledgeable, experienced & takes an obvious pride in his work.
3 oktober 2025
Review zonder uitnodiging
Antwoord van 21 Degrees
Dear Marc,
Thank you for your generous feedback. We're so pleased to hear that your experience with Pete and the team was a positive one. Pete’s dedication, expertise, and pride in his work truly reflect the values we strive for at 21 Degrees, and it’s wonderful to see that recognised.
If we can support you further in any way, please don’t hesitate to reach out.
⭕ The 21 Degrees Team.
Having solar panels and air source heat pump fitted
Having solar panels and An air source heat pump fitted in a new house by 21 company I have to say it was well worth the investment 21 was so efficient and the electricians and plumbers were brilliant Dave and lion and Natalie have been outstanding would I recommend them most certainly 👍
10 april 2025
Review zonder uitnodiging
Antwoord van 21 Degrees
Dear Michael,
Thank you so much for your kind words and thoughtful feedback. We're delighted to hear that your experience with 21 Company was a positive one, and that the installation of your solar panels and air source heat pump has proven to be a worthwhile investment.
It’s especially rewarding to know that our team made such a strong impression with their professionalism and efficiency. We’ll be sure to pass on your compliments.
If there's anything more we can do to support you in the future, please don’t hesitate to reach out.
⭕ The 21 Degrees Team
Great Service
Great Service from a experience service technician.
On time and very knowledgeable. Fully checked and cleaned the air source heat exchanger and updated some of the heating performance curves to give better efficiency.
2 oktober 2025
Review zonder uitnodiging
Antwoord van 21 Degrees
Thank you for your kind review! We're glad to hear our technician provided great service and helped optimise your system’s performance. It’s always our goal to keep everything running efficiently for you.
21 Degrees installed an 8kW air source…
21 Degrees installed an 8kW air source heat pump in my mother's home. They had a good service to do the heat loss calculations and a really pragmatic approach to thinking about where to locate the heat pump. When it came to the installation the team were friendly and got the job done done with little mess. After a few hiccups after commissioning they got it all working and my mum is pleased with how it's all working.
However, throughout the process the communication has been poor: most emails were never answered. Their sales team quickly pick up the phone but if you have a question about the installation, when it is going to happen etc. you will be lucky to get a reply. In their defence, when there is a problem with the heating, they do respond quickly which is encouraging for ongoing service.
Importantly, and what has led to my score of 2, is that the paperwork has not been done and there has been no communication as to when it will be done. Really important documents such as the power company confirming it is ok to install the heat pump, the electrical safety certificate, and the warranty for works have not been provided. Without these documents it could be challenging to sell the house should she choose to in the future and we may need to retrospectively apply for them and pay for them (e.g. the electrical certificate) in order to ensure such problems don't happen. I have chased three times but they do not answer.
While their installation team worked well, their office function does not seem up to it and you should think carefully about using them - frustratingly paperwork does matter.
8 oktober 2025
Review zonder uitnodiging
Antwoord van 21 Degrees
Thank you for taking the time to share such detailed feedback. We’re really glad to hear your mother’s system is now working well and that you found our installation team professional and helpful.
We’re very sorry, however, for the delays and lack of communication regarding the paperwork - this is not the standard we aim to deliver. Your comments have been passed to our operations team for urgent follow-up to ensure all outstanding documentation is completed and sent over as soon as possible.
We appreciate your patience and the opportunity to put things right.
Excellent team. Excellent Service
An excellent one stop shop for all our mechanical and plumbing services for our house build. Excellent advice, excellent service and fantastic onsite team. Particular shout out for Chris who is exceptional.
Thoroughly recommend this team
1 augustus 2025
Review zonder uitnodiging
Antwoord van 21 Degrees
Thank you for the fantastic feedback! We're so pleased to hear you had such a positive experience with our team throughout your house build. We’ll be sure to pass on your kind words to Chris - he’ll be delighted! Thanks again for the recommendation.
Richard
Richard, kept me informed about his exact arrival time and was knowledgeable about the installed ASHP system. A recurrent problem happened after he left and he returned later the same day and followed this up with telephone advice the next day
23 september 2025
Review zonder uitnodiging
Antwoord van 21 Degrees
Hi Nick,
Thank you so much for taking the time to leave us this fantastic 5-star review. We're really pleased to hear that Richard was able to keep you updated, resolve the issue quickly, and follow up to ensure everything was running smoothly. We’ll be sure to share your kind words with him.
Best regards,
The 21 Degrees Team
highly recommended for a great MVHR system.
Most of us do this only once. But, from our experience, to get a great MVHR system (such as we ended with) you need V.Good design, specification and recommendations, Freddie @ 21 degrees (and others) provided all of the above.
Some things (niggles) could be improved but overall we end with an excellent system, pleasant environment, quiet & effective :-)
NOTE : We fitted all the specified rigid ducting ourselves - beware not for the feint hearted.
21 maart 2025
Review zonder uitnodiging
Antwoord van 21 Degrees
Hi Jon3,
Thank you so much for taking the time to share your experience on Trustpilot!
It's wonderful to hear that Freddie and the team provided the very good design, specification, and recommendations needed for you to end up with a great MVHR system. We're delighted that you're now enjoying a pleasant, quiet, and effective environment!
We also appreciate you mentioning the "niggles" that could be improved, as we're always looking for ways to enhance our service and system performance. We'll certainly review this feedback internally.
And yes, you hit the nail on the head—installing the rigid ducting is a significant undertaking!
We really appreciate your review.
Best regards,
The 21 Degrees Team
Excellent products and customer service
Over the past 12 years or so, 21° (or as it was previously called 'Green Building Store') has supplied us with a number of products. Our most recent project was the most ambitious. As part of a complete makeover of our house, our builder installed new windows and external doors throughout, as well as retrofitting an MVHR system, all supplied by 21°. He’d never installed MVHR before and 21° provided full technical and practical support. All the company’s products are of outstanding quality and perform to the highest specifications. Issues inevitably arise with building projects, but customer services will do their utmost to sort things out. We doubt you’d find better products or service elsewhere.
22 augustus 2025
Review zonder uitnodiging
Antwoord van 21 Degrees
Thank you for this review David! We appreciate you taking the time to share your experience.
It’s excellent to hear from long-time customers like you, and we're glad to know you’ve been happy with our products and service since our days as Green Building Store.
We were thrilled to be a part of your most ambitious project yet, and it's fantastic to hear that our technical support made the MVHR installation a smooth process for your builder. Your kind words about the quality of our products and our team's commitment to customer service mean a great deal to us.
We wish you many years of comfort in your newly renovated home. Please don't hesitate to reach out if we can assist you with anything else in the future.
The 21 Degrees team.
Very Satisfied
This company has professional technicians that are polite, helpful and knowledgeable. My installation was neat and tidy and the battery system is working very well
12 augustus 2025
Review zonder uitnodiging
Antwoord van 21 Degrees
Hi Mr Lloyd. Thank you for your kind review! We're delighted to hear you’re very satisfied with your installation and that the battery system is performing well. It’s great to know the team’s professionalism and tidy work made a positive impression.
Best regards,
The 21 Degrees Team ⭕
Great Company - totally recommend
I can not fault this company. We have been deliberating installing solar panels for a long time but never found people who didn't feel like pure salesmen. Totally not the case here. They were up front with costs from the start and felt very trustworthy. The team Matt & Dave were excellent in their pre installation assesments. The installation went smoothly with very little disturbance. The work has been done to a very high standard. This was a big installation with a lot of wiring - It has all been neatly done and buildings left immaculate. Thank you. I would totally recommend this business.
1 augustus 2025
Review zonder uitnodiging
Antwoord van 21 Degrees
Thank you for such a wonderful review! We’re pleased to hear you felt confident and well-informed throughout the process, and that Matt, Dave, and the team delivered both a smooth installation and a high-quality finish. It’s great to know the workmanship and attention to detail met your expectations - and that everything was left neat and tidy. Your recommendation means a lot to us!
Best regards,
The 21 Degrees Team ⭕
Have delt with the company before and…
Have delt with the company before and there service has always been first class and it has again they do what they say when promised can't fault them.
22 juli 2025
Review zonder uitnodiging
Antwoord van 21 Degrees
Dear Michael,
Thank you so much for your fantastic 5-star review! We're absolutely delighted to hear that you've consistently received first-class service from us and that we continue to meet your expectations.
We really appreciate your loyalty and kind words.
We look forward to serving you again in the future!
Best regards,
The 21 Degrees Team ⭕
Excellent solar experience!
Excellent solar experience!
The 21 Degrees team really impressed me - I felt the surveyor really listened to what I was looking for, made some excellent suggestions and at no point did I feel pressured to sign up with 21 Degrees (unlike with other providers who gave me quotes). The installation team were super professional, consulted me every step of the way to make sure I was happy with how things were being done, and completed their work to a very high standard. I think they are excellent.
16 juli 2025
Review zonder uitnodiging
Antwoord van 21 Degrees
Dear Paul,
Thank you so much for taking the time to leave such a great review. We are thrilled to hear that you had an excellent experience with the 21 Degrees team.
It's fantastic to know that our surveyor's suggestions and our installation team's professionalism met your expectations. We pride ourselves on providing a high-quality, pressure-free service, and your feedback validates all our hard work.
We hope you enjoy your new solar system for many years to come!
Best regards,
The Team at 21 Degrees ⭕
Superb triple glazing installed by experts
Superb quality triple glazing installed by seasoned experts who understand airtightness and how to minimise cold bridges.
1 juli 2025
Antwoord van 21 Degrees
Hi John,
Thank you for your fantastic review!
It's great to hear that you're so pleased with the quality of your new triple glazing. We'll be sure to pass on your kind words to our installation team. This feedback is truly appreciated.
Enjoy your new, warmer home!
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