The government will require every insulation installer in the UK to join a national register, a move that could reshape the £2.5 billion retrofit market. The plan, reported by Construction Management Magazine, aims to end the era of unregulated loft and cavity-wall jobs that leave homes colder and bills higher than promised.
As reported by Construction Management Magazine, the reforms would create a mandatory registration scheme for insulation installers, similar to the Gas Safe Register for heating engineers. The Department for Energy Security and Net Zero is consulting on the details, with legislation expected next year.
Who qualifies, and who doesn’t
The register will cover installers of loft insulation, cavity-wall insulation, solid-wall insulation, and floor insulation. Anyone working on a domestic retrofit project will need to be listed, with checks on qualifications, insurance, and past complaints. The scheme is expected to apply to both large contractors and sole traders.
Homeowners who use unregistered installers may find they cannot access certain government grants, such as the Great British Insulation Scheme or the Boiler Upgrade Scheme. Ofgem confirmed to the Axiom team that eligibility for some funding streams already requires TrustMark registration, the new register would formalise that link.
The catch is cost. Registration fees, training updates, and insurance premiums will likely be passed on to customers. A typical loft insulation job for a 3-bed semi might rise by £50–£100, installers estimate. But the alternative, paying twice to fix a botched job, can run into thousands.
What it costs a typical 3-bed semi
A properly insulated home saves roughly £300–£400 a year on heating bills, according to the Energy Saving Trust. Cavity-wall insulation alone can cut heat loss by 35%, lifting an EPC rating from D to C in many cases. For a typical semi-detached house using 12,000 kWh of gas, that saving is real and recurring.
Yet the retrofit market has a reputation problem. Citizens Advice reported over 2,000 complaints about insulation installations in 2023, many involving damp, mould, or incomplete work. The new register aims to cut that number sharply. The government estimates that poor-quality installations cost households £180 million a year in wasted energy and remedial work.
But the register is only one part of the puzzle. The broader retrofit reform, including a single digital logbook for each home, standardised assessments, and a national quality mark, is still being designed. Insulation installers will need to comply by 2026 at the earliest, officials told the Financial Times last month.
What homeowners should do now
If you are planning insulation work in the next 12 months, check your installer is already TrustMark or PAS 2035 accredited. These are the voluntary schemes that the new register will likely replace. Ask for references, insurance certificates, and a written guarantee. Avoid cash-only deals and doorstep salesmen promising “free insulation”, they are often tied to poor materials and no comeback.
The government’s consultation on the register closes on 31 March 2025. Homeowners can submit their views via the gov.uk website. Once the scheme is law, anyone paying for insulation work will have a clear place to check their installer’s credentials, and a stronger case for compensation if the job goes wrong.
For now, the message is simple: insist on accreditation. The register is coming, but your home’s comfort, and your heating bill, cannot wait.
Frequently Asked Questions
Yes, likely by £50–£100 on a typical job, because installers will pass on registration fees and insurance costs. But the alternative of paying twice for a botched job is far more expensive.
The government consultation closes on 31 March 2025. Legislation is expected later that year, with full compliance required by 2026 at the earliest.
