We are officially OFTEC accredited
We are officially OFTEC accredited


Cornerstone is a leading funder and installer of energy efficiency measures, from insulation and heating to renewable technologies. A family business, we have grown organically to service customers across the whole of mainland UK while retaining the steadfast commitment to customer satisfaction that has been our hallmark.

Originally founded in April 2004 as a specialist in cladding and concrete repair, our expertise now extends to a broad range of home improvement solutions. Our customers include private and social landlords with housing stock numbering in the thousands, as well as individual householders seeking a bespoke retrofit solution for their home. In each case, we leverage all available funding and offer competitive finance to ensure each installation is affordable and represents a positive return on investment.

In addition to private and social housing, Cornerstone also works within the commercial and new build sectors as well as partnering local authorities and main contractors on major public sector refurbishment projects. Our expertise extends to hard to treat properties including high rise buildings, park homes and houses of non-traditional construction, each of which demands a bespoke solution. Read more.



Social Housing

Private Housing

Private Landlords

Main Contractors

Public Sector

New Build

Park Homes

Energy Companies





“EDF Energy has contracted with Cornerstone to deliver installation services to offer insulation and heating measures under our ECO2 obligation programme. From the outset they have shown a thorough understanding of the customer journey requirements and have received a number of positive compliments as a result; we have been satisfied that they are a customer focused organisation who go the extra mile to deliver the quality of services we require and are happy to provide an endorsement of their services we have received to date.”

Steve Lawrence, ECO Obligation Key Partnerships Manager, EDF Energy

“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

“Cornerstone is the company who go the extra mile. Installing solar panels on two buildings simultaneously in August 2015 went without a hitch. Both premises were fully operational throughout and the staff were very professional. The installation was under constant supervision by their Project Manager which meant that we could continue business without a worry. The support did not stop there, the paperwork and registration were handled for us. All in all we are very satisfied with the whole project and would not hesitate in recommending Cornerstone for all your installation requirements."

Mr C, Business Owner, Norfolk

"We are absolutely thrilled – our property is already benefiting from the insulation. We are certainly feeling warmer and have already saved on propane gas. We cannot thank your Site Manager enough for all his attention. He is very thorough and always polite. The team that insulated our home were very hard working and also very thorough - extremely nice people. We are more than happy with all the work that has been carried out.

Mr & Mrs H, Park Home Owners, Cheshire


01379 853 613

Registered Office: Cornerstone (East Anglia) Limited, Unit 2-4, Fuller Road, Harleston, Norfolk, IP20 9EA.
Registered No.05117129. Registered in England and Wales.