Approved Document L – New FAQs published as Future Homes Standards implementation approaches

The questions include:

• How do I calculate the efficiency of a solar PV panel?
• Can I choose to install photovoltaic panels on the roof space of a detached garage to meet the required output of Requirement L3?
• What factors could be considered when determining if an onsite renewable electricity generation system and its electrical output are ‘appropriately’ sized for the site and available infrastructure?
• What does it mean for electricity generated from a photovoltaic array to be available for the use of residents in buildings containing dwellings (e.g. blocks of flats)?
• What dimension of PV panel should I use when determining the size of a PV array that covers the ‘reasonably practicable roof area’?

The Future Homes Standard – which includes changes to Approved Documents L and F comes into force in March 2027. The Standard will fundamentally change how new homes and buildings are constructed.

Watch our video to find out all you need to know: