Business Interruption After Machinery Failure (Engineering Sector Guide)

Introduction

In engineering, machinery is often the business. When a key CNC machine, compressor, press, boiler, or production line fails, the immediate repair bill is only part of the problem. The bigger hit is usually the downtime: missed orders, delayed projects, overtime to catch up, and sometimes contractual penalties.

This guide explains business interruption after machinery failure in plain English, with a UK focus. We’ll cover what typically causes losses, how business interruption (BI) insurance can respond, what to watch for in the wording, and practical steps to reduce both downtime and claim friction.

What “business interruption after machinery failure” means

Business interruption is the financial loss you suffer because you can’t trade as normal following an insured event. When the trigger is machinery failure, the loss usually comes from:

• Production stopping or slowing
• Inability to meet delivery deadlines
• Loss of contracts or future work
• Extra costs to keep operating (hire equipment, outsource work, pay overtime)
• Reduced turnover and reduced gross profit

Machinery failure itself is often covered under an engineering or “machinery breakdown” section. The BI element is a separate part that covers the knock-on impact on your income.

Typical machinery failures that lead to BI losses

Engineering businesses face a wide range of failure scenarios. Common examples include:

• Mechanical breakdown (bearings, shafts, gearboxes)
• Electrical failure (motors, control panels, drives)
• PLC/software or control system faults
• Hydraulic/pneumatic failures
• Boiler and pressure plant failures
• Refrigeration plant failure (for temperature-controlled processes)
• Power quality issues (surges, brownouts) damaging equipment
• Operator error leading to damage
• Contamination (coolant, lubrication, debris) causing seizure

Sometimes the failure is sudden and obvious. Other times it’s a slow-developing issue that finally tips into a breakdown.

Why BI losses can be larger than the repair cost

A £15,000 repair can easily create a £150,000 interruption loss if the machine is a bottleneck. In engineering, downtime costs often stack up quickly:

• Fixed costs don’t stop (rent, finance, salaries)
• Work-in-progress may be scrapped
• You may need to pay premium freight or subcontract work
• You may lose priority with key customers
• You may breach service level agreements

BI cover is designed to protect the “ability to earn”, not just the physical asset.

Which insurance policies might respond

There are a few ways cover can be arranged. The right setup depends on your business model and how critical the machinery is.

1) Engineering / machinery breakdown insurance

This covers sudden and unforeseen breakdown of insured plant and machinery. It can include the cost to repair or replace, and sometimes associated costs like:

• Expediting expenses (overtime, express delivery of parts)
• Dismantling and re-erection
• Inspection and testing

2) Business interruption insurance

BI is often packaged within a commercial combined policy, but it’s usually triggered by “damage” at the premises (for example, fire). Machinery breakdown may not count as “damage” unless the policy specifically includes it.

3) Machinery breakdown business interruption (MBBI)

This is the key extension for this topic. MBBI links the machinery breakdown event to BI cover. It can be added to an engineering policy or as an extension to a combined policy, depending on the insurer.

4) Contingent business interruption / supplier extension

If your interruption is caused by a key supplier’s machinery failure (for example, a specialist heat treatment provider), contingent BI may be relevant. Not all policies include it as standard.

What BI cover can include (in practical terms)

BI wordings vary, but these are common cover components.

Loss of gross profit / loss of revenue

Most UK BI policies are written on a gross profit basis. In simple terms, the insurer aims to put you back in the position you would have been in if the loss hadn’t happened.

This typically includes:

• Reduction in turnover
• Increased cost of working (ICOW) where it reduces the loss

Increased cost of working (ICOW)

ICOW is often where engineering firms get the most value. Examples include:

• Hiring temporary machinery
• Outsourcing machining, fabrication, or finishing
• Paying overtime or additional shifts
• Using alternative premises
• Express freight for parts and materials

The key is that the extra spend must be “economic” (i.e., it reduces the overall claim) and properly evidenced.

Additional expenses and professional fees

Depending on the wording, you may be able to claim for:

• Accountants’ fees for preparing claim information
• Engineers’ reports
• Specialist cleaning or decontamination

Key BI terms you need to get right

BI claims can go wrong when the policy terms don’t match the real-world downtime. These are the big ones.

Indemnity period

This is the maximum time the insurer will pay for the interruption. Common options are 3, 6, 12, 18, or 24 months.

Engineering firms often underestimate how long recovery can take when:

• Parts are long lead-time
• A replacement machine needs commissioning
• You need to re-qualify processes or re-certify output
• Customers take time to return

If one machine failure would realistically impact you for 9–12 months, a 3-month indemnity period is a false economy.

Waiting period / time excess

Some MBBI extensions have a time-based excess (for example, the first 24 or 48 hours). That means short outages may not be covered.

Sum insured and adequacy

BI sums insured are often based on annual gross profit (or annual revenue, depending on the basis). Underinsurance can reduce claims via “average”.

A practical check: if you had to stop your main line for six months, would the BI sum insured cover the gross profit you’d lose plus the extra costs you’d spend to keep customers?

Material damage proviso (and why it matters)

Standard BI is typically linked to insured damage at the premises. Machinery breakdown BI needs to be explicitly included; otherwise, you may have repair cover but no downtime cover.

Bottleneck risk and single points of failure

If one machine is the constraint (for example, a 5-axis CNC, laser cutter, or specialist test rig), the BI exposure is higher than your overall turnover suggests. Your broker should understand your process flow, not just your accounts.

Common exclusions and limitations to watch

Policies differ, but these exclusions and limitations commonly cause disputes:

• Wear and tear, gradual deterioration, corrosion
• Defective design or workmanship (sometimes covered only for resultant damage)
• Lack of maintenance or failure to follow manufacturer guidance
• Known defects or pre-existing damage
• Cyber events affecting control systems (may require cyber cover)
• Utilities failure (may need a separate extension)
• Damage to tools, dies, or consumables beyond certain limits
• Losses caused by delays outside your control (for example, supplier delays) unless covered

The detail matters. If you rely on older machinery, or you run high utilisation, it’s worth checking how the insurer treats maintenance records and inspection regimes.

A realistic claim scenario (engineering firm example)

Imagine a precision engineering business with a single high-spec CNC that produces 40% of its output.

• A spindle failure causes the machine to stop.
• Parts are on a 6-week lead time.
• Commissioning and calibration take another 2 weeks.
• During downtime, the firm outsources work to a competitor at a higher unit cost.
• They pay overtime on other machines to keep key customers supplied.

A well-structured claim might include:

• Repair costs under machinery breakdown
• Loss of gross profit from reduced output
• Increased cost of working for outsourcing and overtime
• Expediting expenses to reduce downtime

Without MBBI, the repair might be covered but the outsourcing and lost margin may not be.

What to do immediately after a machinery failure (claims checklist)

The first 48 hours often decide whether the claim is smooth or painful.

1. Make the area safe and prevent further damage.
2. Notify your broker/insurer early (even if you don’t know the full cost yet).
3. Document the failure: photos, error codes, operator notes, maintenance logs.
4. Keep a downtime timeline: when it stopped, what actions were taken, who attended.
5. Track extra costs separately (hire, subcontracting, overtime, freight).
6. Protect customer relationships: communicate realistic timelines and alternatives.
7. Get expert input: manufacturer engineer or independent engineer where needed.

The goal is to show cause, impact, and mitigation.

How BI losses are calculated (plain English)

Insurers usually compare what you actually achieved during the interruption with what you would reasonably have achieved if the breakdown hadn’t happened.

Evidence often includes:

• Management accounts and VAT returns
• Order book and pipeline
• Production records
• Timesheets and overtime records
• Subcontractor invoices
• Stock and work-in-progress records

If your business is growing fast, you may need to demonstrate the “trend” so the settlement reflects your real trajectory.

Risk management: reducing downtime and improving insurability

Good insurance is important, but it’s not the only lever. These practical steps reduce both the likelihood and the impact of failure.

Maintenance and inspection discipline

• Planned preventative maintenance (PPM) schedules
• Documented inspections and servicing
• Oil analysis, vibration monitoring, thermography (where appropriate)

Spares and supplier planning

• Keep critical spares (where feasible)
• Identify alternative suppliers for key parts
• Pre-agree service response times with engineers

Process resilience

• Map your bottlenecks
• Consider whether a second machine, even lower spec, could keep you trading
• Build outsourcing relationships before you need them

Utilities and environment

• Power conditioning where power quality is an issue
• Temperature and dust control
• Fire protection and housekeeping around machinery

Cyber and control systems

If your machinery relies on networked control systems, consider how a cyber incident could stop production. Cyber insurance and good backups can be part of your resilience plan.

Choosing the right cover: questions to ask your broker

If you’re reviewing cover, these questions help you get a better fit.

• Do we have machinery breakdown business interruption included, or only standard BI?
• What is the indemnity period, and is it realistic for replacement lead times?
• Is there a waiting period (time excess) for MBBI?
• Are we covered for hire of plant and outsourcing under ICOW?
• Are expediting expenses covered to reduce downtime?
• How does the policy treat wear and tear and maintenance records?
• Do we need utilities extension or contingent BI for key suppliers?
• Are we adequately insured, or could average apply?

A good broker will also ask you about your production flow, key machines, and contractual obligations.

Quick FAQs

Is machinery failure covered under standard business interruption insurance?

Often not. Standard BI is usually linked to insured damage like fire or flood. Machinery breakdown BI usually needs a specific extension.

What if the breakdown is caused by wear and tear?

Many policies exclude wear and tear, but may cover resultant sudden damage. The exact wording matters.

Can I claim for outsourcing work to keep customers supplied?

Often yes under increased cost of working, as long as it reduces the overall loss and you keep good records.

How long should my indemnity period be?

It depends on how quickly you could repair or replace your critical machinery and recover your customer base. For many engineering firms, 12 months is a sensible starting point, but it can be longer.

Will the insurer pay for expedited shipping of parts?

Some engineering policies include expediting expenses. If not, it may be limited or excluded.

Conclusion and next step

Machinery failure is one of the fastest ways for an engineering business to lose momentum. The strongest protection usually combines machinery breakdown cover with a properly structured business interruption extension, realistic indemnity periods, and clear documentation of maintenance and downtime.

If you want, share the type of engineering work you do (machining, fabrication, plant hire, manufacturing, testing) and your most critical machines. I can help you shape a tighter checklist of cover requirements and a short call-to-action section tailored for your website.

Call to action

If you’re worried about what a single machinery failure could do to your cashflow, we can help you review your current cover and identify gaps. Call 0330 127 2333 or visit insure24.co.uk to discuss engineering insurance and business interruption options.