Legislation Regarding Heat Recovery and Ventilation Systems

Written-by

Janet Richardson

Reviewed-by

Richard Burdett

Updated on

Jan 12, 2026

Legislation Regarding Heat Recovery and Ventilation Systems

The legislation that governs the installation of heat recovery systems is in many cases the same as that which governs conventional heating technologies. Nonetheless, as the British government strengthens its commitments to carbon reduction, there are certain pieces of legislation that are particularly applicable to heat recovery technology.

One such piece of legislation is Part L of the UK’s Building Regulations, which sets minimum energy efficiency standards for new and existing buildings, including limits on carbon emissions and fabric performance. Modern Part L standards encourage high levels of airtightness and insulation, which makes the use of a MVHR system especially useful, and in many cases necessary, as continuous background ventilation is required.

Approved Document F (Ventilation)

Part F of the Building Regulations governs ventilation requirements in buildings and is directly applicable to heat recovery ventilation systems. It sets minimum ventilation rates, commissioning requirements, and controls to ensure adequate indoor air quality in airtight buildings. MVHR systems must comply with Part F to demonstrate that sufficient fresh air is being supplied throughout the property.

A combined heat recovery and ventilation system is a good way to reduce a building’s Dwelling Emission Rate (DER), which forms part of the Standard Assessment Procedure (SAP) used to demonstrate compliance with Building Regulations.

Energy Performance Certificates (EPCs)

Heat recovery systems can contribute to improved SAP scores, which directly affect a building’s EPC rating. EPCs are legally required when selling or renting a property, and improving energy efficiency through technologies such as MVHR can help properties meet minimum energy performance standards.

The Code for Sustainable Homes (CSH has now been withdrawn), but its objectives around reducing carbon emissions have been absorbed into current Building Regulations, SAP calculations, and wider net zero policy for new housing.