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Greenwatt Reviews

Solar panel installer serving Cavan, Ireland

Reviews last updated March 2026

Based on 14 reviews across Google and Trustpilot, Greenwatt has an average rating of 5.0/5. Most recent review: 14 October 2025.

Overall Rating

5.0

14 reviews across platforms

5.0

14 reviews

Rating Breakdown

Based on the last 14 reviews

5 star
100% (14)
4 star
0% (0)
3 star
0% (0)
2 star
0% (0)
1 star
0% (0)

Review Highlights

Top Review

Sarah Ryan OHara

I recently had the pleasure of working with Greenwatt, and I can honestly say it was a fantastic experience from start to finish. From our very first meeting, I felt reassured that I was in good hand...

Most Recent Review

Ditte Kummer-O'Connor

Martin never tires of explaining how things work and is extremely well informed. He and all his team are very dedicated to delivering good quality work. We are very happy that Greenwatt ltd did our fu...

Read Greenwatt reviews below

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Newest Reviews (14)

5/5

Martin never tires of explaining how things work and is extremely well informed. He and all his team are very dedicated to delivering good quality work. We are very happy that Greenwatt ltd did our full retrofit and recommend him unreservedly.

Ditte Kummer-O'Connor14 Oct 2025
5/5

Greenwatt Construction just completed a warmer home complete retrofit of my home the whole process was carried out with the minimum of fuss by their excellent workforce and managed by the project manager Martin O Reilly who was such a pleasure to work with and was always on hand to offer advice witch made the whole experience so comfortable, I would totally recommend them for their excellent workmanship and professionalism

Mick Lordan8 Sep 2025
5/5

Absolutely excellent work. There were a few miscommunications, as there always are in projects of this size, but Martin and his team did their best to rectify any situation in as timely a fashion as possible. I would not think twice about contracting them once again - I say this as someone who has really high standards and extreme attention to detail. The works completed were heat pump, solar, EWI, and other minor insulation-related works. Everything is working according to expectations.

ManzenshaAegis5 Aug 2025
5/5

Greenwatt did a fabulous job retrofitting my house. Martin O’Reilly and his very talented team of Alfie, Johnny etc were so professional, so attentive and friendly that I was genuinely sad to see them go. The house has a new heat pump, new windows, solar panels and an external wrap that I am absolutely delighted with. Greenway are serious builders. Their work is in all respects excellent! Thanks again to Martin and his team. I would recommend Greenwatt to anyone interested in retrofitting their home.

Alan Brennan16 Apr 2025
5/5

GreenWatt recently completed a full retrofit of our 90 year old house in Dublin 5. Insulation, windows, heat pump the works. They were extremely diligent and respectful of the occupants of the house. My wife was 7 + 1/2 months pregnant when the work began and they completed the work before our baby arrived. We are delighted with the finished product. Could not recommend highly enough. Martin and his team are A1.

Fergus O'Farrell10 Mar 2025
5/5

We recently had a full energy retrofit done through GreenWatt and cannot recommend them enough. Martin made the process so smooth from start to finish. He explained everything really clearly, offered expert advise and was always on hand when we had questions. The quality of the work is excellent. Our house is so warm and comfortable and it's one of the best things we have done. Martin has exceptional attention to detail, excellent communication and we felt in very safe hands.

niamh Kirwan17 Feb 2025
5/5

I recently had the pleasure of working with Greenwatt, and I can honestly say it was a fantastic experience from start to finish. From our very first meeting, I felt reassured that I was in good hands. Martin's practical advice and clear explanations made the entire process straightforward and stress-free. He took the time to understand my budget and went above and beyond to ensure that the costs were manageable. His communication skills are top-notch; he was always available to take my calls, always taking the time to explain what he was doing and why. Martin offered valuable advice throughout the project, not just about the immediate work but about the house in general. Overall, It was genuinely enjoyable having Greenwatt do the retrofit; the team was not only skilled but also incredibly friendly, making the whole experience much more pleasant. I should mention that Greenwatt is in high demand, and while you might have to wait for their services, I found it completely worth it. I chose Greenwatt because I appreciated their honest approach. Martin provided realistic timelines, expectations and costs without any false promises, which gave me confidence in the process. Now, I am absolutely loving my new warmer home, which also looks fantastic. The energy retrofit using the One Stop Shop Scheme of my 1990s semi-detached house in Dublin included attic insulation, a heat pump, new windows and doors, external insulation, and related plumbing and electrical work. They even did an extra few small jobs around the house which was much appreciated. In summary, I can't recommend Greenwatt and Martin highly enough. If you're considering a home upgrade or energy retrofit, you won't regret choosing them!

Sarah Ryan OHara27 Oct 2024
5/5

Martin was brilliant, we would absolutely recommend him to anyone doing retrofit work. He made sure to guide all our decisions to ensure the best result for us at the end. Lots of the neighbours have already taken his details after seeing the work!

Janna Ryan21 Sep 2024
5/5

Greenwatt limited recently completed a deep retrofit of our house. Martin and his team were very professional there attention to detail was first class. We would highly recommend martin for any future works and wish the company continued success. Harry and Cynthia O Neill.

Harry O Neill23 Jul 2024
5/5

Martin and the lads were brilliant throughout our retrofit, bringing our house from D1 up to A2. Highly recommend.

Luke Folan23 May 2024
5/5

Brilliant company! Fitted external wall insulation and pumped insulation into brick at front. Insulated the attic also. Martin and team were very good at helping us through SEAI process. No heating bills this winter.

Jim Foley5 Apr 2023
5/5

Greenwatt Ltd completed a deep retrofit of my house and now I have a really warm and energy efficient home. Martin and his team are very professional and I would highly recommend them.

Clodagh Kiernan4 Mar 2023
5/5

Martin and team transformed my home from an E2 to an A2, the work was so well done, and kept within my budget. Any recommendations they make, you know you can trust they are doing what is necessary. I cannot recommend them highly enough, the work was done in 2019 and is still keeping me cosy in winter and cool in the summer, not to mention significanty reducing the bills. For me when i wanted to upgrade my house, it was essential i went with environmentally sustainable options. Martin was the only provider who was willing to give me all the options that best suited my home, and not just upgrading for the sake of it. He utilised all i had in my home already and only did what ws actually needed. Im so happy with the work and its still giving me all the benefits i need.

Ciara Mangan19 Nov 2022
5/5
JPW22 Nov 2020

Frequently Asked Questions

How is Greenwatt rated?

Based on 14 reviews, Greenwatt has an average rating of 5.0/5 across Google and Trustpilot.

How many reviews does Greenwatt have?

14 Google reviews and 0 Trustpilot reviews.

Where does Greenwatt operate?

Greenwatt serves the following areas: Cavan, Dublin, Meath.

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