“Norwich City Council has worked with Cornerstone on our external wall insulation work stream and has found their work to be of an extremely high standard. Resident satisfaction is always very high. I have no hesitation in recommending Cornerstone to potential future clients.”

John Hodson, Major Works Team Leader, Norwich City Council

“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

“Before the new boiler was installed, my contribution to the heating bills was very high. The new system has meant heating my home is much more affordable, plus the air quality is much better now that the old oil boiler has been removed. Very happy!"

Mr D, Home Owner, Sussex

"Not only does my house look brilliant but I am so much warmer and my fuel bills have plummeted. Cornerstone were a very friendly company who were a pleasure to have around and we are really grateful for what they did on the estate."

Jill Sharp, Chairperson of Paston Residents Association, Peterborough