External Wall Insulation Installer Insurance UK
External wall insulation installer insurance covers contractors who fix insulation boards and render systems to the outside of buildings, along with internal wall insulation installers. The core covers are public and products liability, employers' liability, contract works, and cover for scaffolding, tools and plant. External wall insulation brings particular risks: working at height on scaffolding, water getting behind poorly detailed systems, cracking render, and fire performance on taller buildings. The sector has also faced scrutiny over poor installations under government-funded schemes. Insurers look at the systems you install and their certification, your installers' training, how details around windows, roofs and services are handled, the height of buildings and any history of remedial work or claims.
Key facts at a glance
- Detailing causes most problems. Water ingress around windows and junctions leads to many claims.
- Building height matters. Fire safety rules and insurer appetite change on taller buildings.
- Scaffolding brings EL risk. Working at height is the main injury risk for installers.
- Systems must be certified. Insurers want approved systems installed to specification.
- Scheme work is scrutinised. Funded schemes have exposed poor installations across the sector.
What insurance does an EWI installer need?
An EWI installer needs public and products liability, employers' liability, contract works and cover for access equipment.
| Cover | What it protects | Watch out for |
|---|---|---|
| Public liability | Damage to property and injury to the public | Damp and gradual damage exclusions |
| Products liability | Damage caused by the system after completion | Cladding and fire exclusions |
| Employers' liability | Injuries to your workforce | Falls from scaffolding |
| Contract works | Work in progress and materials on site | Weather damage before render cures |
| Plant and scaffolding | Owned or hired access equipment | Hired-in plant conditions |
| Professional indemnity | Design and specification of systems | Needed if you design the build-up |
This sits within our wider retrofit and insulation installer insurance cover.
Why are insurers cautious about EWI?
External wall systems change how a building handles water and heat. If junctions are poorly detailed, water can be trapped behind the insulation and cause damage that is expensive to put right.
Insurers have also become wary of anything that looks like cladding since the Grenfell fire. On taller buildings, fire performance of the insulation and render system is critical, and some insurers exclude work above a set height or on certain building types. Recent reviews of insulation installed under government schemes have added to the caution.
If you work on buildings above two or three storeys, or on blocks of flats, tell your broker. Some policies exclude cladding and external wall work on taller buildings.
What do insurers ask an EWI installer?
Insurers want to understand the systems, the buildings and your team.
- Systems. Manufacturers, certification and insulation type
- Buildings. Houses, flats, height and construction
- Detailing. How you handle windows, eaves, services and junctions
- Access. Scaffolding arrangements and working at height
- Training. Installer training and supervision
- Guarantees. System and workmanship guarantees offered
- History. Remedial work, complaints and claims
How can EWI installers reduce their risk?
- Detail carefully. Follow the system designer's details at every junction.
- Use competent scaffolders. And check their insurance.
- Protect work from weather. Especially before render cures.
- Record everything. Photos at each stage of the build-up.
- Know your height limits. Stay within what your policy covers.
Frequently asked questions
It is a type of external wall system, and insurers often treat it with similar care on taller buildings.
Not always. Check for height and building-type exclusions.
They may be, unless excluded as gradual damage. Check the wording.
If you design or specify the system build-up, yes.
Yes, it can be included. It carries its own condensation risks.
Usually not. Scaffolding contractors should carry their own insurance.
Often, through specialist markets with a full explanation.
Yes. Scheme work is reviewed closely.
Contract works cover can include it, subject to conditions.
Usually within days once we have the details.
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Miller & Partner Limited (FRN 1029698) is an Appointed Representative of Gauntlet Risk Management Ltd (FRN 308081), which is authorised and regulated by the Financial Conduct Authority. Miller & Partner Limited is registered in England and Wales (company number 16206282) and trades from Vivian House, Roman Bridge Close, Mumbles, Swansea SA3 5BG. This article is general information, not a personal recommendation or an offer of cover. Cover is subject to insurer acceptance and the full terms, conditions and exclusions of the policy issued.
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