Future Homes Standard: how to calculate how much solar you need

On-site renewables is now a functional requirement for every new home in England. This guide breaks down the confirmed sizing formula from Approved Document L 2026 and explains why designing beyond the minimum is essential.
The Future Homes Standard is published — here’s the confirmed timeline for implementation

The Future Homes Standard comes into force on 24 March 2027, with a 12-month transition deadline of 24 March 2028. Here is a practical breakdown of the confirmed implementation timeline, the HEM/SAP crossover, and what developers should be doing right now.