Diamond Green Energy Ltd Avis 

The man was very proficient , and very pleasant

Diamond Green Energy is the best solar installer in the UK, full stop.

​As a tech enthusiast, I did thorough research by getting quotes and having physical surveys done by several top-ranking companies in the market. I asked for like-for-like quotes, and in all scenarios, Diamond came out on top. They were not the absolute cheapest, but I didn't focus solely on price. I cared about their standards and getting the best-balanced system at a highly competitive price. Diamond excelled in every aspect, largely because of the incredible people who work there.

​I want to mention a few names, as they are the main reason I trusted Diamond over the others. Mathieu, the sales executive I dealt with, is a wonderful person to work with and the most honest salesman I have ever encountered. He never tried to oversell or pressure me with sales tactics. Instead, he always explained the pros and cons of each option, offered his professional opinion on what would work best for my setup, and then allowed me to make the final call. He always honored his commitments and patiently answered my many, many questions.

​The second person was Declan, the installer. He is a polite gentleman and an absolute expert; his work quality is unmatched. He took care of things I didn't even know to ask for, ensuring top-notch quality and a highly professional finish. It genuinely felt like he was installing the system for his own home, rather than for a client.

​Last but not least was the electrician, Arthur. His cable management was superb, and he took so much extra time to ensure everything looked tidy and professional. These details are the most important part of any solar system—it's not just about the equipment you buy, but how it is installed so it continues to work flawlessly for decades.

​The setup I had installed is a 12.96 kW Sigenergy system consisting of 27 panels and a 27.12 kWh battery backup. I am incredibly happy with this dream installer team. Based on my experience, I have recommended them to many friends and relatives. My uncle, followed by a few others, is now also having solar installed with Mathieu!
​I usually don't give such high praise or spend this much time writing reviews—my review history is proof of that. However, I am doing this for Diamond because I genuinely feel compelled to. They supported me in the best possible ways, and I am absolutely thrilled with the result.

​As a final note, I would highly recommend Mathieu, Declan, and Arthur for Diamond's "Employees of the Year." I am more than happy to share my feedback over a call with management to ensure they are fully recognized and valued within the business. A team like this would be a massive asset to any company.

Stephen did his job - gave the reassurance the customer needed and was especially pleasant and helpful along the way. That is what we’ve come to expect from Diamond gas whom we have known since meeting Ian eight years ago! Thank you Stephen.

The engineer turn up on time and was very considerate when carrying out the work.

We have used Diamond for many years both in our previous home (a new boiler was fitted and serviced yearly) and in our new home we've recently moved into.
Thank you Diamond for resolving the problem we had yesterday with our boiler. Would highly recommend 😀

Drew Bincham and Steve Bell were amazing. They worked conscientiously throughout the day. I was most impressed, they were kind and patient, explaining things until they were confident that I understood. They were very kind, understanding and considerate.

The boiler service was carried out efficiently and very pleased with the excellent service.

Mr. Edward Archbold

Diamond Green Energy were very easy to deal with. My discussion with the sales person was both easy and useful. The sales person was knowledgeable and helpful and not 'pushy' in any way. Subsequent follow up calls were answered promptly as were my follow up questions. The engineer that came to install the boiler was really good. He was polite, informative and obviously 'knew his stuff'. It was a pleasure to have him work in my house. Everything was left clean and tidy.

Arrived promptly, worked very efficiently and left no mess inside or outside the house. Would use again. Pricing very reasonable and units have a 10 year guarantee

No concerns with the inspection of the boiler. However, no text message was received prior to the visit on the day. Also normally pay by a pay machine but one wasn’t available the alternative was a QR code which I wasn’t happy to use. Still waiting for a bill with payment details.

Friendly polite engineer

Pleaseant and polite and professional

Your emgineer did an excellent job servicing the boiler and in particular, was thougjtful and helpful when we discussed servicing the loinge gas fire. Previously we have had great problems in getting the fire to light but this was sorted out by the previous enginering visit and has and continues to work splendidly.
Anthony Scurr

Diamond previously provided plumbing services to move pipe work for our new shower. They carried out our shower installation quickly and efficiently, including dealing with some orientation problems with the shower unit we had purchased.

Arrived when they said they would. Even called before hand to make sure all ok. Did the boiler service quickly and efficiently. Made sure area was clean and tidy when completed. Excellent service all round.

Solar panels seems to be doing ok but after care is terrible. The HanchuEss app glitches quite often and I’ve emailed Jodie cash many times and she keeps sending the same email back saying Hassan will reach out but this guy never did. I’m not sure what else to do

Update : 15/5/26 they’ve still not sort out the glitch and are blaming it on the app. The technician Hassan said he will contact HanchuEss 10 days ago and will get back to me but haven’t.

The Diamond team are very helpful and respond well to changes necessary to fit in with our situation at home . Boiler service carried out quickly and efficiently by a former Royal Navy service man, much appreciated by a former Royal Marine like myself. Thank you all, Diamond!

Efficient and very pleasant engineers who are a pleasure to have in our home.

Excellent service from a very personable technician. Top team.

Excellent service as usual. Had boiler serviced every year since being fitted by this company. Would recommend to any one thinking of having there boiler changed.