Solar and heat pump installers: design, workmanship, guarantees and contract works

Two trades, one insurance trap

Installing photovoltaic panels and installing a heat pump are different physical jobs, but they share an insurance trap: the work is both construction and engineered performance. A customer expects not only a tidy installation but electricity generated or a warm house. When results disappoint, the dispute may concern design more than damage.

Public contractor, professional and business insurance may address parts of these exposures, but their scope depends on the wording. Guidance on this page is not confirmation that any insurer offers terms for these activities. Use this guide to prepare questions for your broker, not to presume cover.

Design responsibility versus workmanship

If you size a system, choose equipment, specify pipework or calculate a heat loss, you are exercising design judgement. Liability for that judgement is usually a professional indemnity question. Workmanship, meanwhile, concerns whether the installation was carried out competently, and may be a liability or contract works question depending on the loss.

Be clear in contracts and in your insurance submission about who designs. If a designer or manufacturer prepares the scheme and you only install, say so, and keep the evidence. If you modify a design on site, record it. Insurers assess design activity separately, and an undeclared design role is a classic mismatch.

Performance and comfort guarantees

Promises of annual generation, savings, bill reductions, room temperatures or seasonal efficiency are performance guarantees. They can be commercially valuable, but they are not ordinary public liability exposures. A policy designed for accidental injury or damage does not usually pay because a system under-delivers.

Review marketing, quotations and contracts for outcome wording. Distinguish estimates, which are expressly not guaranteed, from commitments. If you do guarantee results, ask whether any insurance or manufacturer back-up supports the promise, and consider legal advice on the drafting. Never assume a general policy treats an unmet guarantee as an insured event.

Roof work and PV mounting

Solar installation involves work at height, roof penetrations, fixings, cable routes and weight on structures. HSE publishes guidance on roof work that is relevant to the safety side. On the insurance side, the questions are different: damage to the roof, water ingress through fixings, falling materials, and who is responsible for existing defects.

Record roof condition before starting, with photographs, and note the survey you relied on. State the type of buildings you work on, including commercial, agricultural and listed buildings, and the heights involved. Subcontracted roofers or scaffolders raise their own questions about the cover they hold and your responsibility for them.

Heat pump wet systems and commissioning

Heat pumps involve plumbing, refrigerant circuits, electrical supply and often cylinders and emitters. Escape of water, frost damage, incorrect commissioning and electrical faults can all give rise to claims. A system that is installed but not properly commissioned may fail to perform and cause damage at the same time.

Document commissioning steps, test results, handover instructions and customer sign-off. Explain whether you carry out flushing, pressure testing and controls setting, or leave them to others. Be precise about refrigerant handling and training, and tell insurers if you work on existing heating systems as well as new ones.

Contract works, resulting damage and the defect itself

Contractors’ all risks insurance, where available, can be designed to protect works in progress against damage, such as theft of panels from site or storm damage to materials. It is a different thing from liability for damage your work causes to the customer’s property.

A recurring distinction is between resulting damage and the defect itself. A leaking pipe may cause damage to a ceiling; the ceiling may fall within liability wording while the cost of replacing the pipe is excluded as faulty workmanship. Read exclusions for your own work, design and defective materials, and ask your broker to give examples with your own trade.

Contracts, certification and competence

Customers, lenders and schemes may require certification or membership, and contracts may require stated insurance limits. Insurance does not replace competence requirements, and evidence of qualifications may influence underwriting. Electrical safety obligations are a matter of law and good practice; HSE’s electricity pages are a starting point.

Planning and permitted development rules vary across the UK. The England guidance on renewable and low-carbon energy planning is one reference, not a statement for other nations. Do not promise customers consents you do not control, and keep a record of advice you gave.

Manufacturer warranties, supplied equipment and product defects

Installers choose and supply equipment, and customers often assume that a manufacturer’s warranty answers every fault. Warranties usually cover replacement of defective products on stated conditions, and may be void if installation instructions are not followed. They seldom cover consequential loss or your labour to replace items.

Think about what happens if a batch of inverters or heat pump units proves faulty. Liability to the customer may remain with you under your contract, while recovery from the manufacturer depends on its terms and financial standing. Ask your broker how product-related exclusions, supply of goods and recall costs are treated, and keep records of batch numbers and installation dates.

Customer complaints, evidence and notification

Many claims begin as complaints about poor performance, a leak or a dispute over payment. How you handle the first call can shape the outcome. Record the complaint, the date, the investigation and what you said. Avoid admissions or promises of payment before checking the policy conditions on notification.

Keep job files that include the quotation, design assumptions, photographs of the installation stages, test results and handover documents. If a policy requires prompt notice of circumstances, set an internal rule to pass any serious complaint to your broker quickly. This is part of managing the insurance, not an assertion that any complaint will be covered.

A submission for an installer

Prepare turnover by activity, typical and maximum job value, residential versus commercial split, design role, subcontractors, guarantees offered, standard contract terms, certificates, training records, claims history and any problem installations. Describe growth plans, such as batteries or larger commercial systems.

Terms depend on insurer acceptance and the final wording. Oak can help you present the work using public contractors, professional indemnity and business services, but this guide does not confirm availability for any class.

Related guides

• Renewable energy · 5 min readEV charger businesses: installer, owner, operator and network roles compared
• Renewable energy · 5 min readBattery storage: domestic installers, commercial BESS owners and who needs which cover
• Risk presentation · 5 min readDeclined, cancelled, not renewed or avoided: telling four insurance events apart