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INSURANCE FOR ONE-OFF ENGINEERING & MADE-TO-ORDER MANUFACTURING
Why Bespoke Engineering Is a Different Insurance Problem
One-off engineering and bespoke manufacturing is not “mass production”. Each project is a unique combination of design assumptions, materials, tolerances, subcontractors, and customer expectations. When something goes wrong, the dispute is rarely about a single part — it’s about responsibility: who designed it, who approved it, who specified materials, who signed-off testing, and what the contract says about warranty, consequential loss and delay.
The risk profile is also lumpy. Instead of thousands of identical units, you might have a small number of very high-value projects: custom machinery, pressure-related equipment, special assemblies, prototype work, test rigs, robotics cells, conveyors, tooling, fabrication for unique installations, or bespoke structures. A single defect can trigger total rebuild, project delay claims, liquidated damages, and (in worst cases) injury or property damage where the equipment fails in use.
Bespoke & One-Off Engineering Manufacturing Insurance is designed for this environment. It combines traditional manufacturing covers (property, employers’ liability, public & products liability) with the specialist covers that often make or break a bespoke engineering business: professional/technical indemnity for design and specification risk, contract works and project stock, transit and installation risk, and business interruption.
Who Needs Bespoke & One-Off Engineering Insurance?
If you design, build, fabricate or assemble custom engineered products — and particularly if you deliver to a customer specification or deliver turnkey solutions — your exposures are different to a standard jobbing shop. Most bespoke engineering businesses have a blend of manufacturing and “professional service” risk: quoting, design, tolerance advice, value engineering, prototyping, testing and commissioning.
This cover is commonly needed by manufacturers producing one-off or made-to-order equipment, including custom machinery builders, specialist fabricators, prototype workshops, and engineering companies supplying complete assemblies or systems.
- Custom machinery and special-purpose equipment (SPE) manufacturers
- Prototype, R&D and one-off component manufacturers
- Specialist fabrication and engineered assemblies
- Turnkey engineering solutions (design + build + install)
- Robotics cells, conveyors, automation, test rigs and jigs
- Pressure-related equipment and specialist engineered vessels (where applicable)
- Engineering firms using subcontractors for finishing, machining, heat treat, electrical
- Manufacturers working under customer contracts with LDs and warranty obligations
Core Cover 1: Employers’ Liability
Employers’ Liability (EL) is typically essential for UK engineering manufacturers. Bespoke engineering environments often include welding and hot works, lifting operations, working at height during installation, use of forklifts and cranes, machining, grinding, fabrication, electrical assembly, pneumatic/hydraulic systems, and site work at customer premises.
Insurers will focus on how you manage health & safety in both your own workshop and on customer sites: risk assessments, permits to work, training, supervision, PPE, equipment maintenance, LOLER inspections, and incident reporting. Strong controls can improve underwriting terms and premium, especially for businesses doing significant work away.
- Covers employee injury and occupational illness allegations
- Includes legal defence costs and compensation awards
- Supports site work exposures (install/commissioning) where declared
- Can address labour-only/agency staff arrangements (where applicable)
- Improves compliance with customer site access requirements
- Better terms with strong H&S management evidence
Core Cover 2: Public & Products Liability (Including “Completed Works” Risk)
Public liability covers injury or property damage arising from your operations — including customer visits, deliveries, and work away where you install, repair or commission. Products liability applies to injury or property damage arising from what you manufacture or supply. In bespoke engineering, the “product” may be a complete machine, system or assembly installed into a customer site.
The challenge is that claims can be high-severity. If a bespoke machine fails and damages the customer’s line, the downstream damage can be significant. Also, many bespoke engineering disputes begin as “performance failures” (financial loss) and later escalate into property damage claims. Your insurance needs to reflect this chain and be described accurately for underwriters: what you build, what it does, where it is used, and how you test and handover.
Another key issue is contract terms. If you accept broad warranties or unlimited consequential loss obligations, insurers may restrict cover or price higher. We help align contracts and insurance so you don’t inadvertently take on uninsured exposures.
- Public liability for operational risks and work away (where applicable)
- Products liability for bespoke machines, assemblies and supplied components
- Completed works risk for installed and commissioned equipment
- Defence costs for claims and allegations
- Territory options for export and overseas installation (subject to underwriting)
- Clarity on subcontractor involvement and responsibility
- Better outcomes with robust testing and handover documentation
Specialist Cover: Technical / Professional Indemnity (Design & Specification Risk)
Bespoke engineering often blurs the line between manufacturing and professional services. If you design a system, provide drawings, specify materials, advise on tolerances, or recommend modifications, you can face claims for financial loss even where no injury or property damage occurs. Typical disputes include “it doesn’t meet performance requirements”, “the design assumption was wrong”, “the load calculations were incorrect”, or “the specification caused downstream rework and delay”.
Public/products liability focuses on injury and property damage. It does not automatically cover purely financial loss arising from professional negligence allegations. That’s why technical/professional indemnity can be a key part of bespoke engineering insurance — particularly for turnkey projects and “design & build” contracts.
If your contracts contain performance guarantees, LDs (liquidated damages), or consequential loss exposure, you need to understand what insurance can and cannot do. We’ll help you structure cover and also advise where contract wording improvements may reduce uninsured risk.
- Design, drawings, specification and advice exposure
- Performance and fitness-for-purpose disputes (financial loss allegations)
- Claims-made structure with retroactive date considerations
- Cover tailored for design & build, turnkey and project engineering
- Subcontractor design responsibility and approval workflows
- Alignment of contract caps with PI limits to reduce uninsured exposure
Project Stock, Contract Works & High-Value Build Risk
Bespoke engineering losses are often “project-shaped”. You may have a high-value build in progress: frames, assemblies, controls, motors, sensors, hydraulics, bespoke machined parts and bought-in components. If a fire, theft or water escape damages the build, you could lose months of labour and materials — and still be contractually committed to deliver by a deadline.
A standard stock sum insured may not reflect peak project values. Also, project builds may be partially owned by customers depending on contract terms or stage payments. Where you hold customer-owned materials and parts, you may have bailment exposure. You also need to think about where the build is stored (on-site, off-site, in transit, at subcontractors) and how insurance responds across locations.
Action: map peak project values and make sure your insurance is sized for the largest build you may hold at any one time.
- High-value project builds and WIP (peak values, not average stock)
- Bought-in parts, controls, motors, sensors, hydraulics and specialist components
- Customer-owned materials and bailment exposure (where applicable)
- Storage at subcontractors and third-party premises (where applicable)
- Appropriate security and fire protections for project storage areas
- Clear asset schedules and valuations to support claims outcomes
Installation, Commissioning & Work Away Risk
Many bespoke manufacturers also install and commission equipment. That introduces additional exposures: work at height, lifting, hot works, electrical connections, testing under power, and operating in a customer’s environment with other contractors. Claims can arise from accidental damage to the customer’s premises, injury to third parties, or allegations that the installation caused downtime or damage.
Insurance needs to reflect where work is done (UK only or overseas), how long you are on site, whether you subcontract installation, and what you connect to (power, gas, hydraulics, compressed air). Some projects also require site-specific insurance evidence.
We help align your work away description, territories, and risk controls with insurer expectations.
- Public liability for installation and commissioning activities
- Work away / working at height and lifting operations considerations
- Tool and equipment cover for site work (where required)
- Overseas work and export/installation territories (subject to underwriting)
- Subcontractor control and contractor management
- Handover documentation and acceptance testing support
Business Interruption for Project Businesses
Bespoke manufacturers can be vulnerable to interruption because revenue is project-driven. A major loss at your workshop (fire, flood, theft) can wipe out WIP and push delivery dates out by months. That can create not only lost turnover but also direct contract disputes and cashflow pressure.
Business interruption insurance can help bridge this gap — but it must be structured for reality: long lead-time components, specialist subcontractor dependencies, and the time required to rebuild jigs, fixtures and test setups. Project businesses also need to model peak exposures: if you lose the “one big build” in the workshop, what happens to revenue and profit?
We help size BI and increased cost of working so it supports real recovery actions such as outsourcing, expedited purchasing, temporary workshop space, or additional shifts.
- Loss of gross profit following insured damage
- Increased cost of working (outsourcing, overtime, temp premises)
- Indemnity periods aligned to project rebuild and supply chain lead times
- Consideration of subcontractor and supplier dependency (where relevant)
- Sizing BI around peak project value and delivery profile
- Better outcomes with realistic recovery plans and documentation
Other Covers Often Needed
Bespoke engineering manufacturers often need a broader mix of cover depending on what they build, how they sell, and what customers demand. Many projects involve high-value transit, specialist tooling, cyber-related downtime (CAD files, CNC programs, ERP systems), and contract disputes where legal costs add up quickly.
The goal is not to buy everything — it’s to buy the right structure that closes meaningful gaps. We’ll help you select covers that align with your real-world “project failure modes”.
- Goods in Transit for high-value machines and assemblies
- Tools and equipment cover (including away from premises)
- Cyber insurance (incident response, restoration, downtime options)
- Commercial legal expenses (contract and employment disputes)
- Directors’ & Officers’ / management liability for leadership risk
- Environmental liability where chemicals, fuels or waste exposures exist
- Engineering inspection / statutory inspection where applicable
- Credit insurance or surety bonds (sector dependent)
When you build one-off machinery, the biggest risks are design responsibility, project value on the shop floor, and contract penalties if delivery slips. Insure24 helped us structure PI and liability properly, and build a programme that matched our turnkey projects.
Managing Director, Bespoke Engineering ManufacturerPROJECT-DRIVEN INSURANCE FOR BESPOKE ENGINEERING
- Cover structured for one-off builds, prototypes and made-to-order machinery
- Professional/technical indemnity options for design & specification exposure
- Project stock and WIP values sized to peak build exposure
- Work away and commissioning risk aligned to how you deliver projects
- BI structured around realistic rebuild and supply chain lead times
- Support for customer insurance clauses and contract evidence
Quality, Compliance & Underwriting Confidence
Insurers generally respond well when bespoke engineering businesses demonstrate process discipline: design review sign-off, revision control, documented testing, subcontractor control, and robust health & safety management — particularly where work away and installation is part of delivery. You don’t need to be a giant business to have strong controls; you need evidence and consistency.
Depending on what you build, you may also have sector standards or approvals (ISO 9001, customer approvals, pressure-related documentation, welding qualifications, inspection regimes, and traceability). We help present this in a way underwriters understand.
- Design review, sign-off and change control discipline
- Revision control for drawings, BOMs and manufacturing instructions
- Testing, commissioning and acceptance documentation
- Subcontractor control (machining, finishing, electrical, hydraulics)
- Welding procedures and competence evidence (where relevant)
- Inspection and quality records supporting performance claims defence
- Strong health & safety controls for workshop and site work
- Contract register and customer insurance clause management
FREQUENTLY ASKED QUESTIONS
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What is bespoke engineering manufacturing insurance?
It’s a tailored insurance approach for businesses that design and build one-off or made-to-order engineered products, often combining liability, property and BI with technical/professional indemnity options for design/specification risk and project-driven exposures.
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Do I need Professional Indemnity if I build bespoke machinery?
If you provide design, drawings, specifications, engineering advice, or turnkey design & build services, PI/technical liability can be important because many disputes involve financial loss and performance allegations rather than injury/property damage.
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How should we insure high-value project builds and WIP?
You should model peak project values (not average stock), identify where the build is stored (on-site, off-site, at subcontractors, in transit), and declare customer-owned goods where applicable. This ensures sums insured reflect the “largest build on the floor”.
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Does public liability cover installation and commissioning work?
It can, but the policy needs to reflect your work away activities, territories, and the nature of installation/commissioning. If you regularly work on customer sites, the insurer should be aware so cover and pricing are aligned to the exposure.
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Can insurance cover contract penalties or liquidated damages?
Insurance doesn’t usually “pay LDs” as a simple benefit, and contractual liability is complex. The best approach is aligning contract terms to realistic limits, managing exposure through caps and clear responsibilities, and ensuring the insurance programme covers the underlying insured events where possible.
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How do we set business interruption for bespoke engineering?
BI should reflect project-driven revenue, lead times for replacement components, rebuild time for tooling and test setups, and realistic recovery actions such as outsourcing or temporary premises. Indemnity periods should match the time it would take to get back to pre-loss output.
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What information do you need to quote bespoke engineering insurance?
Typically: what you design/build/install, project values and peak WIP, industries served, turnover and territories, claims history, subcontractor usage, testing and handover process, contract terms (caps/LDs), property and plant values, and work away/installation details.
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Can you help with customer insurance requirements and certificates?
Yes. We help engineering manufacturers meet contract-driven requirements (limits, territories, certificates and reasonable endorsements) and structure programmes that reduce gaps while satisfying procurement and project teams.