Agility installed insulation in thousands of eligible homes across England and Wales between March 2023 and November 2025 under the Connected for Warmth scheme, the installer has reported. The programme was supported by the National Grid energy efficiency fund1.
The company describes the scheme as award-winning and says it reduced carbon emissions, tackled fuel poverty and improved residents' comfort1. No breakdown of the number of homes treated, the measures installed or the funding total has been reported1.
"Between March 2023 and November 2025, through the award-winning Connected for Warmth scheme, Agility installed insulation in thousands of eligible homes across England and Wales."
Agility's account of its wall insulation work sets out three methods and their typical installation times1:
| Method | Typical properties | Installation time |
|---|---|---|
| Cavity wall insulation | Most GB homes built after the 1920s | Around two hours for an average house with easily accessible walls |
| External wall insulation | Most UK properties built pre-1920s | Around 7 to 10 days, using scaffolding |
| Internal wall insulation | Pre-1920s homes more likely to have solid walls | Not stated |
Cavity wall insulation involves drilling small holes at regular intervals around the outside wall, blowing in mineral fibre or polystyrene beads, and filling the holes in the brickwork. The insulation carries a 25-year guarantee backed by the Installation Assurance Authority (IAA)1. For external wall insulation, teams assess suitability, carry out enabling work such as moving downpipes and gutters, attach a thermal layer to the existing external walls, cover it with coloured render or a decorative finish, and restore removed fittings1. Internal wall insulation involves a technical survey, extending electrical sockets and removing radiators and skirting boards, building a stud wall filled with insulation material such as mineral wool fibre, then adding a vapour barrier and plasterboard1. Agility says internal insulation can also improve the soundproofing performance of external walls1.
Before installation, properties are assessed by Agility's retrofit surveyors and independently inspected by the IAA to ensure no pre-existing damp or mould issues need to be addressed1. Around a third of the heat in an uninsulated home escapes through the walls, according to the company1.
Agility also helps social housing providers, local councils and housing associations to access grant funding including the Warm Homes: Local Grant, the Warm Homes: Social Housing Fund and the Great British Insulation Scheme1. It says many grants are open to a wide range of households, with some means-tested on income or benefits received and others available regardless of financial circumstances, and that eligibility may depend on factors such as property type, energy performance and postcode1.
Why it matters for households
Wall insulation reduces the rate at which a home loses heat, which affects how much energy is needed to keep rooms at a given temperature. For a household, that bears on running costs and on how far a home can be kept warm from its own supply rather than depending on purchased energy. The measures described differ in disruption: cavity wall insulation is presented as a matter of hours, while external wall insulation is presented as 7 to 10 days with scaffolding1. Solid wall properties, more common among pre-1920s homes, need either external or internal insulation rather than cavity fill1. The scheme that has now ended covered England and Wales only; arrangements in Scotland, Northern Ireland and Wales differ, and the England grant landscape has changed with the move from the Great British Insulation Scheme to the Warm Homes: Local Grant, compared here. Households in the private rented sector face separate minimum energy efficiency standards. The wider case for fabric measures is set out in Insulation, Glazing and Energy Independence, and the grants and schemes section covers current support routes.
What happens next
Connected for Warmth ran to November 2025 and has not been reported as continuing beyond that date1. Agility states that it continues to deliver Warm Homes funding, including the Warm Homes: Local Grant, the Warm Homes: Social Housing Fund and the Great British Insulation Scheme1. No successor scheme under the Connected for Warmth name has been reported1.
Sources1 cited
- Wall insulation, agilityeco.co.uk