Insulation Contractors near you

Cavity wall insulation has a genuine complaints history in this country, and anyone selling it to you should be willing to talk about it rather than brush it aside. The recurring pattern is insulation put into walls that were not suitable for it: exposed, weather-beaten elevations, walls with cracked render or failed pointing, or cavities partly bridged with mortar debris. Moisture then crosses the cavity and appears as damp inside. This is why a survey of the wall's condition and exposure matters more than the material being injected into it.

The scheme-funded picture has been worse. The National Audit Office reported in October 2025 on energy efficiency installations under the Energy Company Obligation, describing widespread non-compliance identified by TrustMark across insulation measures, ranging from major issues posing immediate risks to the health and safety of the household through to minor issues such as missing paperwork, and finding clear failures in the design and set-up of the schemes' consumer protection and quality assurance system. Government guidance now directs households with concerns about solid wall insulation installed under these schemes to the relevant scheme's complaints route.

None of that is an argument against insulating. It is an argument for knowing who guarantees the work before it starts. Cavity wall insulation fitted by a registered installer is typically covered by an independent 25-year guarantee from the Cavity Insulation Guarantee Agency, which also runs a process for reporting a concern and maintains a list of remediation contractors. Whatever guarantee you are offered, ask who stands behind it and what happens if the installer stops trading.

Insulation delivered under government schemes is not a one-visit job. Retrofit work under these schemes is carried out to the PAS 2035 and PAS 2030 standards, with TrustMark - which Ofgem describes as the government endorsed quality scheme for domestic retrofits - responsible for quality assurance against both technical and consumer protection standards. In practice that means the property is assessed before measures are chosen, someone coordinates the package as a whole rather than each measure separately, and a record of what was installed is lodged.

It is worth knowing who is actually who in that arrangement, because "government endorsed" reads like a regulator and is not one. The Department for Energy Security and Net Zero sets the policy and the legislation, Ofgem administers the Energy Company Obligation on the department's behalf, and TrustMark - which the National Audit Office describes as a private not-for-profit company acting as a government-endorsed quality scheme - does the quality assurance and sub-licences the scheme providers who register individual businesses. So a complaint travels through the scheme provider and TrustMark rather than to a government office, and the trader you deal with is registered rather than licensed.

Even when you are paying privately, that sequence is a sound model: assess the whole house, agree an order of work, then install. Insulating one element of a poorly ventilated house in isolation is exactly how condensation problems are created. TrustMark also lets you search for a registered business by the specific trade you need, which is worth doing before any deposit changes hands.

LokalMatch handles the introduction rather than the work: describe the property and the job once, with your postcode, and insulation contractors covering your area get in touch. Pros pay for the requests they receive. LokalMatch does not install anything, does not set prices, and does not vet, rank or recommend the businesses that reply, so checking registrations, guarantees and what each quotation actually covers remains your call.

The Energy Company Obligation places the duty on larger energy suppliers rather than on government departments. ECO4 came into force in July 2022, applies to measures installed from 1 April 2022, and runs until 31 December 2026 following a nine-month extension. It covers Great Britain rather than the whole of the UK, and funds insulation and heating improvements for low income, fuel poor and vulnerable households, with eligibility linked to certain benefits and to homes in the lower EPC bands.

The Great British Insulation Scheme ran alongside it and mostly delivered single insulation measures. It was open to homes with an EPC rating of D to G within council tax bands A to D in England and A to E in Scotland and Wales. Its online eligibility checker has closed, some suppliers have continued to take applications directly, and installations must be complete by 31 March 2026, when the scheme ends. In Scotland, Home Energy Scotland offers grants and interest-free loans covering measures including solid wall, loft, room-in-roof, cavity and underfloor insulation.

Landlords have a standard of their own to meet. In England and Wales, a property covered by the domestic minimum energy efficiency standard cannot be let with an EPC rating below E, a rule that has applied to continuing tenancies since 1 April 2020, unless a valid exemption has been registered on the national exemptions register, which members of the public can search.

Insulation touches the building regulations more often than people expect. In England, Approved Document L covers the energy efficiency requirements and Approved Document F covers ventilation in dwellings, with a separate volume for homes. Scotland requires a building warrant for many kinds of work, granted by the local authority acting as verifier under the Building (Scotland) Act 2003, with technical handbooks in place of approved documents and completion certificates at the end. In Northern Ireland the building regulations sit with the Department of Finance and building control is run by district councils. External wall insulation may also need planning consent, particularly in a conservation area or on a listed building, so ask the council before ordering materials.

Older properties bring one more check that is easy to skip and expensive to get wrong. The Health and Safety Executive warns that asbestos can be present in any building built or refurbished before the year 2000, and that when asbestos-containing materials are damaged or disturbed the fibres released can cause serious diseases. Anything suspect in a loft, around a flue, or in old board material is a stop-work item for qualified assessment, not something to pull out and bag up on a Saturday.

Government guidance on damp and mould identifies condensation as the most common form of damp in homes: moisture generated inside the home cools and condenses onto colder parts of the building. It names inadequate ventilation, poor heating, insufficient insulation and building defects among the causes, and is blunt that the respiratory effects of damp and mould can cause serious illness and, in the most severe cases, death. Insulation is part of the answer to that, but only when ventilation is treated as part of the same job.

So after insulating, keep the ventilation working: extract fans in kitchens and bathrooms that genuinely run and vent outside, trickle vents left open rather than taped shut, furniture kept slightly clear of cold external walls, and any mould dealt with along with its cause rather than painted over. If a room that used to be draughty starts showing condensation on the windows every morning after insulation work, treat that as feedback about ventilation rather than proof the insulation was a mistake.

Keep the paperwork too. The guarantee for the measure, any TrustMark or scheme record, the retrofit documents and the updated EPC all belong with the deeds, and they are what a future buyer, tenant or surveyor will ask to see.