Mark fitted LED panels to our offices. The work was carried out over three phases and was done to an excellent standard with minimum disruption. The new lights provide a brilliant white light with a significant energy reduction. After completion the offices were left clean and the old units were disposed of responsibly. He was a pleasure to work with and I wouldn't hesitate to recommend GDH3.

- Mark Harrison [Director, Harrison Silverdale Ltd] (Dronfield)

September 2016

We first had Mark to fit us a security light a year or so ago. He was very reliable so we decided to have him again this year to help with a complete house renovation. Mark rewired the house and helped with all the electrics in the kitchen as well as a new alarm system. He turned up on time every day he came and stayed extra at night to do some extra jobs I had asked him to do. He always left the house tidy and mess free. We had an issue with an electric garage door after the zapper had been lost and he researched what was best to do with it. As well as electrics he has helped advise me on other matters to do with my renovation and nothing was ever to much trouble for him. I can 100% say that I probably could not have done this project without him. He has been amazing. Thank you

- Amy Binney (Dronfield)

September 2016

I have known Mark for many years, so when I needed an electrician I knew who to call.It's no wonder his business is so successful, he is very professional, his work is first class and I would have no hesitation in recommending him. Thanks Mark

- Helen Barber (Dronfield)

September 2016

Mark came to do the electrical work in our new extension and a couple of small jobs elsewhere. He is a lovely man, very professional, clean and tidy, did a fabulous job. Punctual, honest and reliable, happy to leave him in the house and would certainly recommend him to others.

- Jill Thompson (Chesterfield)

September 2016

Mark is a true gent and a true professional, providing excellent service and amazing value for money. I would recommend him to anyone at anytime. Thank you for your advice and excellent work.

- Kirstie Porter (Bolsover)

September 2016

It's refreshing these days to find someone you can trust and who doesn't let you down. I am so pleased Mark was recommended to me as the work he has done has been outstanding. He came up with solutions on both occasions I have used him and I would not hesitate to pass on a further recommendation for such a professional and friendly person to deal with. Thank you.

- Liz Staley (Dronfield)

September 2016