Grant Store Ltd (GSL) is a Trustmark-registered energy efficiency provider, specialising in renewable energy solutions across the UK. Since 2017, we have helped homeowners, businesses, and social housing providers reduce energy costs and carbon footprints through high-quality, tailored installations. Our Services Solar PV & Battery Storage – Harness solar energy for long-term savings. Air Source Heat Pumps – Reduce heating costs with renewable technology. Insulation & Heating – Improve efficiency with loft, solid wall, and room in roof insulation. With over 100 skilled professionals, we manage projects from consultation to installation, ensuring compliance and excellence at every stage. Get Solar PV Get an ASHP