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THE MOST COMMON INSURANCE MISTAKE IN ENGINEERING
Many metal and engineering manufacturers assume that Product Liability covers design mistakes — or that Professional Indemnity covers defective products. In reality, they respond to different allegations, under different triggers, and often under different policy structures.
If your business manufactures components and provides drawings, specifications, advice, commissioning input or design modifications, you may need both — structured correctly to avoid gaps.
Simple Definitions
Product Liability (PL)
Product Liability insurance covers legal liability for injury or property damage caused by products you have supplied, subject to policy terms and territorial limits.
- Physical injury to third parties
- Physical damage to third-party property
- Completed operations after delivery
- Manufacturing defects
- Assembly or material failure
PL usually responds when there is physical damage — not pure financial loss.
Professional Indemnity (PI)
Professional Indemnity covers allegations of negligent professional services such as design, drawings, specifications, calculations, advice, programming or commissioning input — typically on a claims-made basis.
- Design errors
- Incorrect drawings or tolerances
- Specification mistakes
- Programming / commissioning advice faults
- Financial loss without physical damage
PI is often triggered by financial loss allegations rather than physical injury.
Key Differences at a Glance
- Trigger: PL is usually occurrence-based. PI is claims-made.
- Loss Type: PL focuses on injury/property damage. PI focuses on negligence and financial loss.
- Own Work: Neither typically covers routine own work rectification.
- Territory: PL territory/jurisdiction must match exports. PI must align with where advice is relied upon.
- Retroactive Date: PI requires attention to retroactive dates; PL does not.
- Contractual Exposure: Both can be affected by uninsurable contract terms (penalties, guarantees).
Real-World Engineering Scenarios
The easiest way to understand the difference is through scenarios. The allegation framing determines which policy may respond.
Scenario 1: Material Failure
You manufacture a fabricated bracket. It fails due to a welding defect, damaging customer equipment.
- Physical property damage occurred
- Allegation: defective manufacture
Likely Response: Product Liability (subject to wording).
Scenario 2: Drawing Error
You provide a drawing with incorrect tolerances. The customer manufactures from it and incurs losses — no physical injury occurs.
- Financial loss only
- Allegation: negligent professional service
Likely Response: Professional Indemnity (subject to wording).
Scenario 3: Commissioning Setting Error
During commissioning, you input incorrect settings causing mechanical damage to a production line.
- Physical damage occurred
- Allegation could be “advice” or “operational error”
Possible Response: Depends on allegation framing. Could involve PL or PI — this is where gaps often occur.
Scenario 4: Pure Financial Loss Claim
Your advice on material selection leads to premature wear, but no injury or external property damage occurs.
- Loss is economic
- No third-party property damage
Likely Response: Professional Indemnity (subject to wording).
Common Gaps Between PL & PI
- Assuming PL covers design input
- No PI despite providing CAD/CAM or specs
- Retroactive date gaps after switching PI insurers
- US/Canada exposure not declared properly
- Contract terms creating liabilities beyond policy scope
- No alignment between PL and PI limits
- Failure to notify circumstances early under PI
FREQUENTLY ASKED QUESTIONS
Do engineering manufacturers need both PL and PI?
If you only manufacture to customer drawings with no design input, PL may be sufficient. If you provide drawings, specs, advice or commissioning input, PI is often essential alongside PL.
What is a retroactive date in PI?
It’s the date from which past work is covered under a claims-made PI policy. Gaps in cover or changes of insurer can remove protection for earlier work.
Does PL cover product recall?
Standard PL often does not cover recall costs. Recall insurance is usually a separate extension or policy.
Does PI cover physical injury?
PI is primarily for professional negligence and financial loss. Injury claims are typically addressed under liability policies, subject to policy wording.
What happens if a claim involves both design and product failure?
Complex claims may involve both PL and PI. Having aligned limits and coordinated policies helps reduce disputes between insurers.
Are contractual penalties covered?
Liquidated damages and penalties are often excluded. Contract review is as important as insurance placement.
We export to the US — does that matter?
Yes. US/Canada exposure significantly affects PL underwriting and pricing and must be declared accurately.
How do insurers price PI for engineering?
They consider turnover from design services, contract values, sectors supplied, checking procedures, documentation controls and claims history.
Can one policy combine PL and PI?
Some insurers offer combined wordings, but many risks place them separately. The key is ensuring they align and avoid gaps.
How can Insure24 help?
We help analyse your real exposure — manufacturing vs design vs commissioning — and structure PL and PI together so the programme reflects how you actually operate.
ALIGN YOUR PRODUCT LIABILITY & PI
WITH REAL-WORLD ENGINEERING RISK
If your business manufactures, designs or commissions — you need clarity on where liability ends and professional risk begins. Insure24 can help structure cover that reflects how you actually trade.