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DESIGN RISK IS DIFFERENT FROM PRODUCT LIABILITY — AND IT OFTEN FALLS THROUGH THE GAPS
Engineering manufacturers increasingly provide more than parts: CAD/CAM files, drawings, tolerances, material selection advice, load calculations, assembly instructions, integration guidance and commissioning sign-off. When a client alleges that your advice, design, drawing or specification caused them loss, the claim is typically a Professional Indemnity (PI) matter — and may not be covered by product liability or public liability.
This page explains how PI works for metal and engineering manufacturers, what it covers, common exclusions, and how to structure PI alongside product liability for a joined-up programme.
What Is Professional Indemnity for Engineering Manufacturers?
Professional Indemnity insurance is designed to protect your business if a client alleges you have made an error in professional services — such as designs, drawings, specifications, calculations, advice, inspection or certification — and that error causes them financial loss.
The key differences vs other covers:
- PI is usually “claims-made” — cover responds when a claim is made (and notified) during the policy period, not when the work was done.
- It often addresses financial loss (pure economic loss) rather than only injury/property damage.
- It is highly sensitive to contracts — liability can be expanded by warranties, indemnities and “fitness for purpose” promises.
- It needs to align with PL/product liability so there aren’t gaps between “design” allegations and “product” allegations.
Typical PI Allegations in Engineering
- Incorrect drawings, dimensions or tolerances
- Wrong material specification or heat treatment advice
- Load calculations errors (platforms, lifting points, frames)
- Design changes not recorded or approved
- Commissioning advice causing system failure or damage
- Inspection/QA sign-off errors
- Incorrect installation instructions / method statements
- Failure to warn about limitations or suitability
When PI Is Commonly Needed
- You provide CAD/CAM files, drawings or manufacturing packs
- You offer design-for-manufacture improvements
- You advise on materials, tolerances or safety factors
- You provide installation/commissioning advice or sign-off
- You supply assemblies where integration depends on your spec
- Your contracts include “fitness for purpose” language
- You are asked to hold PI by an OEM or main contractor
Why Product Liability or Public Liability May Not Cover Design Allegations
A lot of engineering firms assume “we’ve got liability cover, we’re fine.” The problem is that many real disputes are about financial loss: rework costs, delay penalties, replacement labour, and project overruns — often without any injury claim.
Public liability and product liability are typically designed around third-party injury and property damage. They can exclude or limit: professional services, advice, design, and pure financial loss. That’s why PI exists.
Common “Gap” Scenarios
- Wrong drawing issued → client fabricates incorrectly → claim for wasted labour/material
- Spec advice error → wrong material used → replacement project costs (no injury)
- Tolerance stack issue → assembly doesn’t fit → delay penalties and rework
- Commissioning advice error → downtime and troubleshooting costs
- Design change not documented → client alleges negligence and seeks recovery
- Inspection sign-off error → nonconforming product released → containment costs
Joined-Up Programme: PI + Product Liability
Many claims involve both “design” and “product” allegations. The best approach is to structure PI and product liability so the policies complement each other:
- Clear definition of professional services and insured activities
- Aligned limits and defence cost treatment (where possible)
- No contradictory exclusions across policies
- Territory/jurisdiction aligned to where clients operate
- Contract review to reduce uninsurable promises
How Insurers Underwrite PI for Engineering Manufacturers
Underwriters want to understand what professional services you provide and how you control error risk. Strong processes can reduce premiums and improve terms.
What Insurers Will Ask
- What % of turnover involves design, drawings or consultancy?
- Typical contract values and worst-case loss scenarios
- Sectors supplied (aerospace, automotive, medical, construction etc.)
- Any safety-critical work, load-bearing structures or lifting points
- Use of standard contracts and any onerous indemnities
- Your checking/approval process for drawings and specs
- Document control and revision tracking discipline
- Claims history and circumstances (even if no payout)
Controls That Improve Terms
- Independent checking of drawings/calculations (peer review)
- Formal sign-off, competence records and training
- Document management system with revision control
- Clear scope definition and change control in contracts
- Design assumptions documented (loads, materials, tolerances)
- Client approvals recorded before manufacturing
- Quality systems and NCR/CAPA discipline
- Professional services limitation clauses where acceptable
Key PI Terms to Get Right
PI policies are technical. These are the items that most often determine whether a claim is paid or disputed:
Claims-Made, Retroactive Dates & Notifications
PI is typically claims-made: you need cover in force when the claim is made and you must notify circumstances promptly. If you change insurer, the retroactive date and continuity matter.
- Retroactive date (how far back work is covered)
- Continuous cover (avoid gaps between policies)
- Notification conditions (claims and circumstances)
- Run-off cover if you cease trading or sell the business
- Defence costs and panel solicitors approach
Limits, Excess & Contractual Promises
PI limits should reflect the worst-case scenario: replacement costs, project delay impacts, professional fees, and multi-party disputes. Many uninsurable issues come from contract terms rather than “negligence”.
- Limit of indemnity (any one claim vs aggregate)
- Excess level aligned to your cashflow
- Fitness for purpose / guarantees (often problematic)
- Liquidated damages and penalties (often excluded)
- Contractual liability beyond common law (restricted)
Practical Tip: Your Contract Can Make You Uninsurable
If you sign contracts that promise performance outcomes or accept unlimited liability, insurance may not respond — even with PI. A short contract review process (even a checklist) can reduce disputes and protect your ability to claim.
FREQUENTLY ASKED QUESTIONS
Do engineering manufacturers really need Professional Indemnity?
If you provide drawings, specs, CAD/CAM files, calculations, advice, commissioning input or technical sign-off, then yes — PI is often essential. Product/public liability may not cover “professional services” allegations or pure financial loss claims.
What’s the difference between PI and product liability?
Product liability typically focuses on third-party injury and property damage arising from products supplied. PI covers negligence in professional services such as design, drawings, specifications and advice, and often responds to financial loss claims (subject to policy terms).
Does PI cover rework costs if we make a mistake?
PI is not designed to cover your own cost of redoing your work as a matter of course, but it can respond to client claims for losses caused by negligence (subject to wording). The scope depends on the allegation, contract terms and policy.
What is a retroactive date and why does it matter?
It’s the date from which your past work is covered under a claims-made PI policy. If you change insurer or have a gap in cover, you can lose protection for earlier work.
Do we need PI if we only manufacture to the customer’s drawing?
Not always — but many manufacturers do more than they think (DFM changes, tolerance suggestions, material advice, inspection sign-off). If any of that exists, PI can be relevant.
Will PI cover contractual penalties or liquidated damages?
Often not. Many PI policies restrict cover for liquidated damages, penalties, and contractual liabilities assumed beyond common law. Contract review is a key risk control.
How do insurers price PI for engineering firms?
They look at the nature of your professional services, % of turnover from design/advice, typical contract values, sectors supplied, checking procedures, document control, and claims history.
Can PI be combined with other covers?
Yes. Many engineering firms place PI alongside product liability, public liability, contract works, plant/tools and cyber. The goal is a joined-up programme with no gaps between design and product allegations.
What should we do if a client alleges our drawing/spec caused a loss?
Preserve documents and version history, avoid admissions, gather facts, and notify your broker/insurer promptly as a circumstance/claim under the PI policy. Early notification helps protect your position.
How quickly can Insure24 quote PI for engineering manufacturers?
Once we have your turnover split (design vs manufacturing), services provided, typical contract values, checking procedures and claims history, we can approach PI markets quickly for many risks.
PROTECT YOUR DESIGNS, DRAWINGS & ADVICE
WITH ENGINEERING PI COVER
Insure24 helps engineering manufacturers place PI that reflects real-world exposures — drawings, specs, CAD, commissioning advice and contract-driven risk. If you want PI that aligns with your product liability and site work, we can help structure it properly.
WHAT WE HELP YOU PROTECT
- Design, drawings, calculations and specifications
- Commissioning advice and technical sign-off exposure
- Financial loss claims from alleged negligence
- Contract-driven liability and disputes
- Continuity of cover (retro dates and notifications)
WHY INSURE24
- Engineering-aware PI placement
- Joined-up approach with PL/product liability
- Support with contract and scope presentation
- Access to specialist PI markets
- Ongoing support at renewal and as services evolve