“The end to end experience with Cornerstone was first class. They have excellent technical knowledge and designed a system that perfectly meets our needs. The installation process was quick and clean and we were kept informed every step of the way. More than a year into operation and the system has reduced our heating costs by around 35%, with Cornerstone continuing to provide support throughout. I would thoroughly recommend Cornerstone.”

Kim Hazell, Director, Chichester Close Saltdean RTM Company Ltd, Sussex

“In September 2016 your company installed outside wall insulation. I am amazed at the money we are saving on heating – no more wearing coats and sitting covered with a duvet. We would like to say a big thank you for your excellent product."

Mrs B, Home Owner, Wimblington, Cambridgeshire

“I am very pleased with the standard of work delivered by Cornerstone, which has transformed the centre. I found Cornerstone to be a very knowledgeable, professional and responsive company that I would certainly use again for similar projects."

Colin Sheldrick, Site Manager at C J Murfitt, Cambridgeshire

"I would like to take this opportunity to thank Cornerstone for the excellent job you did on insulating my home. Both the Site Manager and his team have done a superb job and have worked very hard. I was particularly impressed on how polite and efficient every member of the team were at all times. Once again, thank you."

Mr A, Park Home Owner, Cheshire