The available measures are split into “primary” and “secondary” categories. Households will need to install at least one of the primary measures below to qualify for funding.
Insulation: Solid wall, cavity wall, under-floor, loft, flat roof, room in roof, park home.
Low carbon heat: Air source heat pump, ground source heat pump, solar thermal.
“Top-ups” are allowed (e.g. additional loft insulation up to the recommended level, solid wall insulation for other walls where a wall has been previously insulated), but replacements are not included. So long as there is at least one primary measure in the package of works, households will also, be able to install secondary measures.
Secondary measures can only be subsidised up to the amount of subsidy provided for primary measures. (e.g. if a household receives £1,000 for primary measures, they can only receive a maximum of £1,000 towards secondary measures).
The secondary measures are:
- Draught proofing
- Windows and doors: Double/triple glazing (where replacing single glazing), secondary glazing (in addition to single glazing), upgrading to energy-efficient doors
(where replacing doors installed prior to 2002).
- Heating controls and insulation: appliance thermostats, hot water tank thermostats, hot water tank insulation, smart heating controls, zone controls, delayed start thermostat, thermostatic radiator valves.
For low-carbon heating to be installed, households will need to have adequate insulation (e.g. wall and loft, where applicable).