The handbook offers users a snapshot of each technology, including the current costs, carbon savings and benefits, as well as profiling the main funding options, quality assurances and guarantees to protect customers.

Emma Harvey, programme director at the Green Finance Institute, said: “By providing financial institutions with the latest information on the costs, risks and benefits of green home technologies, the handbook informs and empowers the finance sector to fund retrofit projects and develop new financial solutions to support their customers’ net-zero ambitions.”

David Postings, chief executive of UK Finance, added: “Greening our housing stock is vital if we are to meet our climate change obligations and banks and finance providers are committed to helping achieve this goal and making sure consumers are not left behind.

“This handbook provides a helpful resource for lenders hoping to better understand current green retrofitting technologies, and will help them support customers in making their choices.”

Paul Broadhead, head of mortgages and housing policy at the Building Societies Association, said: “We often hear phrases such as retrofit plans, or low-carbon technologies, without always knowing what these are or how they work in practice.

“This handbook provides vital information for mortgage lenders looking to understand more about how to help customers decarbonise their homes, it fills an important knowledge gap.

“Looking forward we also need government to help educate the public and provide clarity on how they will support them to improve the energy efficiency of their homes.”