Archives: Definitions

Warm Homes: Social Housing Fund Wave 3 (WH:W3)

A UK government funding initiative targeting social housing retrofit in England, launched under broader decarbonisation and fuel poverty strategies. It specifically addresses energy performance upgrades for existing social housing stock.…

Microgeneration Certification Scheme (MCS)

A nationally recognised quality assurance and consumer protection scheme for small-scale renewable energy and low-carbon technology installations in the UK. The MCS sets rigorous standards for the design, installation, and…

Boiler Upgrade Scheme (BUS)

A UK government grant scheme providing financial support to property owners in England and Wales for replacing fossil-fuel heating systems (e.g., gas or oil boilers) with low-carbon alternatives, primarily heat…

Air Purification

Air purification refers to the systematic removal of airborne contaminants—such as dust, pollen, mould spores, volatile organic compounds (VOCs), and pathogens—to enhance indoor air quality (IAQ). In the UK, this…

Air Source Heat Pump (ASHP)

An air source heat pump (ASHP) is a renewable energy system that extracts ambient heat from outside air and amplifies it to provide space heating, cooling, or domestic hot water…

Single Room Flow Optimised Heat Recovery (srAFHR)

Single Room Flow Optimised Heat Recovery (srAFHR) is a decentralised mechanical ventilation system designed for individual rooms in residential buildings. It uses alternating airflow technology to extract stale air while…

Ductless MVHR

A decentralised ventilation system used in residential and retrofit projects, particularly where installing ductwork is impractical or cost-prohibitive. A ductless MVHR is a compact, wall-mounted ventilation unit (through-the-wall) that supplies…

Resident Liaison Officer (RLO)

A Resident Liaison Officer (RLO) is a professional responsible for facilitating communication and managing relationships between construction or retrofit project teams and residents or tenants in the UK housing sector.…

Housing Health & Safety Rating System (HHSRS)

Official Definition and Purpose of HHSRS The Housing Health and Safety Rating System (HHSRS) stands as a pivotal risk-based evaluation tool employed by local authorities across England and Wales to…