Cavity Wall Insulation Installer Insurance UK
Cavity wall insulation installer insurance covers businesses that inject or blow insulation into the cavities of existing walls. The essential covers are public liability for damage during installation, products liability for damage the insulation causes afterwards, employers' liability and cover for blowing machines, vans and materials. The trade has a well-known claims history, with homeowners alleging that insulation installed in unsuitable walls caused damp, mould and damage. Many claims arise years after the work. Insurers therefore look closely at how you survey properties, the exposure of the walls, the materials and systems used, guarantees, and any complaints or claims. Some mainstream insurers exclude cavity wall work entirely, so cover often comes from specialist markets.
Key facts at a glance
- The trade has a claims history. Damp claims from unsuitable installations have made insurers cautious.
- Products liability must respond. Damage caused by the insulation itself is the main exposure.
- Surveys protect you. Pre-installation surveys showing suitability are your best defence.
- Wind-driven rain is a key issue. Insurers ask about exposure zones and wall condition.
- Guarantees matter. Long-term guarantees reassure both customers and insurers.
What insurance does a cavity wall installer need?
A CWI installer needs public and products liability, employers' liability, and cover for equipment and materials.
| Cover | What it protects | Watch out for |
|---|---|---|
| Public liability | Damage to the home or injury during installation | Damp and condensation exclusions |
| Products liability | Damage caused later by the insulation | Specific CWI exclusions |
| Employers' liability | Injuries to installers | Working at height |
| Tools and plant | Blowing machines, drills and access equipment | Theft from vans overnight |
| Goods in transit | Insulation materials on the move | Stock limits in vans |
For other retrofit trades, see our retrofit and insulation installer insurance page.
Why are cavity wall claims so common?
Cavity insulation is only suitable for some walls. Where it is fitted to walls exposed to driving rain, with defects or narrow cavities, moisture can bridge the cavity and cause damp inside.
A large number of homes were insulated under past government schemes, and some of those installations have led to complaints and legal claims, often years later. That history has made insurers cautious about the whole trade. Many want to see that today's installers survey properly, reject unsuitable walls and keep clear records.
A claim may arrive ten years after the installation. Surveys, photos and sign-off records kept for the long term are often what defends it.
What do insurers ask a CWI installer?
Insurers want to understand your volume, your methods and your history.
- Number of installations each year and the split by scheme
- Insulation materials and systems used
- How walls are surveyed, including exposure and condition
- Certification and scheme registrations
- Guarantee provider and terms
- Extraction or remedial work you carry out
- Complaints and claims history
Installers with a history of claims can still find cover. See our guide to insulation installer insurance after a claim.
How can a CWI installer reduce risk?
- Survey before you drill. Record wall type, condition and exposure.
- Refuse unsuitable walls. And keep a record of why.
- Use certified systems. Install to the manufacturer's specification.
- Photograph your work. Before, during and after.
- Register guarantees promptly. For every installation.
Frequently asked questions
Yes, but some insurers exclude it. Specialist markets will write installers with good processes.
Only if damp and condensation are not excluded. Check the wording carefully.
Often, yes, with a full explanation of the claims and the changes since.
Yes. Claims usually relate to the insulation after installation, which is a products liability exposure.
Yes. Extraction must be declared and is rated separately.
No. Guarantees cover the homeowner for defects; your liability insurance covers claims against you.
Many years. Long-term records and continuous cover matter.
Yes. Exposure is one of the main factors in suitability.
Labour-only subcontractors can often be covered under your policy.
A few days for clean risks, longer with a claims history.
Related guides from Miller & Partner
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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