Cornerstone has a philosophy of self-delivery, installing our energy efficiency measures using a combination of directly employed staff and self-employed individuals that work exclusively for our business wherever possible. Our people are highly skilled and committed to providing high quality energy efficiency solutions for our customers.

We remain a family business, with an ethos of local, long term and sustainable employment. Cornerstone also has a strong track record of offering structured apprenticeships and work placements across our business, in partnership with local colleges and employment initiatives.

Please see our Careers page for details of any current vacancies.

Skills & Training

Everyone that works for Cornerstone is subject to a Personal Development Plan that sets a template for their continuous professional development. Our employees all receive an above industry average levels of training, from technical learning programmes to soft skills such as Customer Care.

All of our apprentices are studying towards an NVQ in a relevant discipline, or an equivalent technical qualification, to equip them for a sustainable career in their chosen field.

This approach to the development of our people ensures that they are well equipped to achieve the high standards we set for them, and to deliver a first class service for our customers.

Supply Chain


Cornerstone seeks to support the local economies in which we work by engaging a supply chain from the local area. We maintain a list of vetted and approved suppliers and subcontractors and welcome enquiries from local SMEs interested in joining this database.

Cornerstone is also a proud signatory of the Prompt Payment Code, a voluntary register administered by the Chartered Institute of Credit Management (CICM) that sets standards for payment practices. By joining the register in 2016, we formalised our commitment to treating our suppliers fairly and paying them on time. By maintaining the trust and confidence of our suppliers, we are well placed to deliver reliable and high quality installations for our customers.

Charities and Sponsorship


From 2018, Cornerstone has chosen to donate money raised from our regular charitable events to projects administered through the Gold Standard.  The Gold Standard was established in 2003 by WWF and other international NGOs as a best practice standard to ensure projects that reduced carbon emissions under the UN’s Clean Development Mechanism (CDM) also delivered on the dual mandate to foster sustainable development.  Our donations allow us to offset the carbon produced through our business activities, thereby protecting the climate while also helping communities access critical services like energy, safe water, food and education. 

Cornerstone also continues to sponsor Harleston Town Football Club, which plays in the Thurlow Nunn North Division. Formed in 1885, the club is a major focal point for the local community and has seen many Cornerstone employees involved as players and managers over the years. Recently the club has enjoyed an excellent run of form and string of promotions.

As the club’s main sponsor, Cornerstone has made a significant contribution to club finances since 2011, funding vital infrastructure improvements as well as new kit. 

Harleston Town FC’s General Manager commented “I am absolutely delighted that Cornerstone will be sponsoring us for another season. Like the football club, Cornerstone is a major part of the local community and for us to come together once again is fantastic news for all involved”.

01379 853 613
Cornerstone (East Anglia) Ltd are authorised and regulated by the Financial Conduct Authority FRN 917418.  We act as a credit broker not a lender and offer finance to consumers from a panel of lenders.
Registered Office: Cornerstone (East Anglia) Limited, Unit 2-4, Fuller Road, Harleston, Norfolk, IP20 9EA.
Registered No.05117129. Registered in England and Wales.