Business Interruption Insurance for Kiln-Based Production: A Practical UK Guide

Kiln-based production is built around one critical asset: heat. Whether you run a ceramics studio, a brick and tile works, a glass manufacturer, a refractory producer, or a specialist metal heat-treatment operation, your kiln is often the heartbeat of output, quality, and cashflow. When it stops, the impact is rarely limited to repair costs. Orders slip, energy contracts still run, wages still need paying, and customers may turn elsewhere.

This is where Business Interruption (BI) Insurance matters. BI is designed to protect your business’s income and ongoing costs when an insured event disrupts trading. Below is a UK-focused guide to what BI is, how it applies to kiln-based operations, and how to set the cover up so it actually pays when you need it.

What is Business Interruption Insurance?

Business Interruption Insurance (sometimes called Loss of Profits insurance) is usually arranged as part of a Commercial Combined or Property policy. It covers the financial fallout of a disruption following insured damage (most commonly fire, flood, storm, escape of water, impact, or other perils listed in your policy).

In simple terms, BI can help replace:

• Lost gross profit (or lost revenue, depending on the basis of cover)
• Ongoing fixed costs (rent, rates, finance payments, key salaries)
• Increased Cost of Working (ICOW) (extra costs you spend to keep trading, like outsourcing production)

BI is not the same as “repairing the kiln”. The kiln repair is typically handled under the material damage section (property cover). BI is about what happens to your business while you’re unable to operate normally.

Why kiln-based production has a unique BI risk profile

Kiln-based businesses face interruption risks that can be more severe than many other manufacturing operations because:

• Single point of failure: one kiln (or one main kiln line) can control most output.
• Long lead times: specialist parts, refractory lining, burners, controls, and installation engineers can take weeks or months.
• Heat-up and cool-down cycles: even after repairs, you may need time to safely recommission.
• Product in process: firing cycles can be ruined mid-run, causing scrap and rework.
• Energy dependency: gas/electricity supply issues can halt production.
• Quality and compliance: certain sectors require consistent heat profiles and documented processes.

A strong BI setup acknowledges these realities and builds a realistic recovery timeline.

Common causes of interruption in kiln-based production

While every site is different, common BI triggers include:

• Fire and smoke damage (including electrical fires, dust ignition, packaging storage fires)
• Escape of water (sprinkler discharge, burst pipes affecting electrics and controls)
• Flood and storm (site access issues, water damage to switchgear)
• Mechanical or electrical breakdown (often excluded unless you add engineering cover)
• Power supply failure (may need a specific extension)
• Gas supply interruption (may need a specific extension)
• Damage to extraction/ventilation systems causing shutdown
• Damage to control systems (PLC/SCADA) and specialist sensors
• Denial of access (police cordons, nearby incidents)
• Supplier failure (critical raw materials, packaging, outsourced processes)

Important: many BI policies only respond when the interruption follows insured property damage at your premises. That means a kiln breakdown that isn’t caused by an insured peril may not trigger BI unless you have the right add-ons.

Understanding the key BI terms (in plain English)

Indemnity period

The indemnity period is the maximum time the insurer will pay your BI claim for, starting from the date of loss.

For kiln-based production, short indemnity periods can be a common mistake. Refractory relining, controls replacement, and commissioning can take longer than expected.

Typical options include 12, 18, 24, or 36 months. The right answer depends on:

• How quickly you can source parts and engineers
• Whether you can outsource production
• Planning permission or building works needed
• Your order backlog and customer tolerance

Gross profit vs gross revenue basis

BI cover can be arranged on different bases. Two common ones are:

• Gross profit basis: covers loss of turnover and the gross profit you would have earned, after adjusting for variable costs.
• Gross revenue basis: simpler, but can over- or under-insure depending on your cost structure.

Most manufacturers use gross profit because it aligns better with how interruption affects profitability.

Increased Cost of Working (ICOW)

ICOW covers extra costs you incur to reduce the interruption, such as:

• Hiring temporary kiln capacity elsewhere
• Outsourcing firing to a partner
• Leasing temporary equipment
• Paying overtime in other departments to catch up
• Expedited shipping for raw materials or replacement parts

The insurer typically expects ICOW to be economical (i.e., the extra spend should not exceed the loss it prevents).

Trends and variations

This clause adjusts the claim to reflect business trends (growth, seasonality, new contracts). It can help, but it can also reduce claims if not understood.

For kiln-based businesses with seasonal peaks (construction materials, retail product lines), it’s important your broker explains how this clause will work in practice.

Getting the “sum insured” right for kiln-based BI

Underinsurance is one of the biggest reasons BI claims disappoint.

To set BI correctly, you typically need:

• Annual turnover
• Gross profit (as defined by the policy)
• Indemnity period

Then you apply the Declaration Linked or Index Linked approach (depending on the policy) to keep values aligned with growth and inflation.

Practical example (simplified)

If your annual gross profit is £600,000 and you choose a 24-month indemnity period, you may need a gross profit sum insured of around £1.2m (plus an allowance for growth). This is simplified, but it shows why a 12-month period can be risky if your true recovery time is longer.

Extensions that matter for kiln-based operations

A standard BI section may not cover the real-world causes of interruption for kiln-based production. Ask about these common extensions:

• Machinery breakdown / Engineering breakdown BI: for interruptions caused by mechanical/electrical failure (not just fire/flood).
• Public utilities: cover for failure of electricity, gas, water, telecoms (often within a defined radius).
• Denial of access: if you can’t access the premises due to an incident nearby.
• Suppliers and customers (contingent BI): if a key supplier’s loss stops you producing, or a key customer’s loss stops demand.
• Loss of attraction / non-damage BI: relevant if you rely on footfall (less common in heavy production, but relevant for visitor-led studios).
• Cyber BI: if a cyber incident shuts down production systems, ordering, or dispatch.

The right mix depends on your operation. A ceramics studio with a showroom has different BI triggers than a brick works supplying construction projects.

What insurers will want to know (and how to prepare)

When you insure kiln-based production, insurers commonly ask about:

• Kiln type (gas/electric), age, maintenance regime
• Controls and safety systems (interlocks, temperature monitoring)
• Fire protection (detection, suppression, housekeeping)
• Storage of combustibles and packaging
• Extraction and dust management
• Electrical inspections and thermographic surveys
• Business continuity planning (alternative sites, outsourcing options)
• Critical spares held on site

If you can show a clear plan for prevention and recovery, you often get better terms.

Claims: what good evidence looks like

If you ever need to claim, the smoother claims are usually the ones where the business can quickly evidence:

• Pre-loss trading figures (monthly management accounts)
• Order book and pipeline
• Production logs and kiln schedules
• Stock records and work-in-progress
• Payroll records and staffing plans
• Invoices for extra costs (outsourcing, overtime, hire)
• Repair timelines and engineer reports

It’s worth setting up a simple “BI evidence pack” in advance so you’re not scrambling during a crisis.

Common BI mistakes in kiln-based production

• Choosing a 12-month indemnity period when 18–24 months is realistic
• Insuring turnover rather than true gross profit as defined in the policy
• Assuming breakdown is covered when the policy only covers insured perils
• Forgetting utilities and supplier dependency
• Not accounting for commissioning time and quality assurance after repairs
• Not updating sums insured after growth, new contracts, or price increases

How to reduce your interruption risk (and improve insurability)

Insurers like practical risk management, especially where heat and fire risk is present. Useful steps include:

• Preventive maintenance schedules and documented servicing
• Keeping critical spares (sensors, controllers, igniters, fans)
• Clear housekeeping around combustibles and dust
• Fire detection and suitable extinguishers for electrical risks
• Thermal imaging surveys for electrical hot spots
• Backup suppliers for key raw materials and packaging
• Written continuity plan: “what we do if the kiln is down for 2 weeks / 2 months”

These steps can reduce the chance of a loss and shorten downtime if something happens.

Quick checklist: setting up BI for kiln-based production

• Choose an indemnity period that reflects real repair + commissioning timelines (often 18–24 months)
• Confirm whether breakdown is covered (engineering section and BI extension)
• Add utilities, denial of access, and supplier/customer extensions where relevant
• Set gross profit sums insured correctly and allow for growth
• Ensure ICOW is included so you can outsource or hire equipment
• Keep evidence ready: accounts, production logs, and order book

Need help tailoring cover to your kiln operation?

If you’re unsure whether your current policy would respond to a kiln outage, it’s worth reviewing the BI section alongside your property and engineering cover. The right structure can be the difference between a manageable disruption and a long-term cashflow crisis.

Want a quick, no-obligation review? Speak to a UK commercial insurance specialist who understands manufacturing risks, and ask them to stress-test your indemnity period, sums insured, and key BI extensions against your actual kiln recovery timeline.