What Is Business Interruption Insurance for Tradesmen?
Business interruption insurance replaces the trading income you lose when insured damage stops you working. It does not stand on its own: it sits on top of a property, stock or plant policy and only responds once that policy has accepted a claim for the physical damage behind the stoppage.
That link back to physical damage is the single thing most trade buyers miss. A fire in your unit is covered, a quiet January is not, and understanding which is which is what makes the section worth adding to a tradesman insurance package.
This guide covers how the cover works when you have no premises, what actually triggers a payout, how the indemnity period is chosen, and why loss of income and increased cost of working are two different settlements.
Business interruption only responds once a property, stock or plant policy has already accepted a claim for the physical damage behind the stoppage, so it never stands alone. A fire in your unit is covered; a quiet January from lost custom is not, and mixing the two up leads to disappointed claims. Set your indemnity period to cover how long a real rebuild or restock would actually take, not just a few weeks.
Compare tradesman insurance cover that includes business interruption protection.
- How does business interruption insurance actually work?
- What has to happen before a claim pays out?
- Does it work if you have no workshop or premises?
- What is the difference between loss of income and increased cost of working?
- How long should your indemnity period be?
- Why is it sold alongside stock, plant and premises cover?
- What is not covered by business interruption insurance?
- Frequently asked questions (FAQs)
How does business interruption insurance actually work?
It measures what you would have earned had the damage never happened, then pays the shortfall for an agreed period. The settlement is based on gross profit, not turnover.
Gross profit is not what your accountant means
In insurance terms, gross profit is turnover less the costs that fall away when you stop trading, chiefly materials and bought-in labour. Wages, rent, finance and insurance carry on, so they stay inside the figure.
Get that sum wrong and the policy pays a proportion of the loss. Most under-settlements start with a sum insured copied off a tax return.
The waiting period before anything is paid
Most wordings apply a short excess measured in days or in money before the payout begins. It works like the excess on any other section, filtering out very small stoppages.
The rest of the settlement then runs across the indemnity period you chose at inception. That is a separate decision from the sum insured, and it is set out further down this page.
What has to happen before a claim pays out?
Insured physical damage to property you rely on. Fire, flood, storm, escape of water, impact or theft damage all qualify; a slow month, a lost contract or your own injury do not.
The material damage proviso in plain English
Nearly every wording contains a proviso saying the material damage policy must have paid, or admitted liability, for the damage. No property claim means no interruption claim.
That is why insurers rarely sell the section on its own. It is an extension of a property policy wearing a different name.
Where trades get this wrong
Injury is the big one. If you fall off a roof, business interruption does nothing, because nothing was damaged; personal accident or income protection is the cover that answers, not your public liability policy either.
Loss of a major client is the other one. Commercial reasons are not insured perils, however painful the shortfall.
| What happens | Material damage claim? | Does business interruption respond? |
| Fire in your workshop or lock-up | Yes, on the property or contents section | Yes, for lost gross profit |
| Flood destroys stored stock and plant | Yes, on stock and plant cover | Yes, while you re-equip |
| Break-in wrecks the unit and the racking | Yes, theft damage | Yes, if trading is halted |
| You break your wrist on site | No property damaged | No, this is a personal accident matter |
| Your biggest client stops calling | No insured peril at all | No |
| Ransomware locks your scheduling system | No physical damage | No, unless a cyber policy is bought |
Does it work if you have no workshop or premises?
It can, but only where you insure something physical that the business depends on. With no premises, no stock and no plant, there is usually nothing for the cover to attach to.
What a van-based trade can actually insure
A handyman working out of a van and a garage still has insurable property: tools, stock, a compressor, a trailer, the garage itself.
Some insurers will write interruption cover triggered by damage to that property, or by damage to a vehicle you cannot work without. The trigger is narrow, so read what is scheduled.
Home-based and lock-up trades
If you run the business from home, the household policy almost never picks this up. Domestic contents wordings exclude business stock and business use, so the loss falls outside both policies.
A cleaning business storing machines and consumables in a lock-up has a clear insurable interest. A sole trader carrying everything in a van often has very little.
What is the difference between loss of income and increased cost of working?
Loss of income pays for the work you could not do. Increased cost of working pays what you spend to keep doing it, which is often the cheaper outcome for both sides.
Why insurers would rather pay the costs
If hiring a replacement machine for £600 saves £4,000 of lost profit, the insurer will fund the hire. That is increased cost of working, and it is capped by the saving it produces.
Additional increased cost of working goes further, funding spend that keeps the business alive even where the economic test is not met. Small trade policies often carry it as a modest fixed sum.
- Loss of income: the gross profit shortfall while you are unable to trade normally.
- Increased cost of working: temporary premises, plant hire, overtime, subcontracted labour.
- Additional increased cost of working: spend that protects the business rather than the profit.
- Professional fees and debris removal, which usually sit on the property section instead.
How the two settle on the same claim
Most real claims use both heads. The insurer funds a temporary unit and some plant hire, then pays whatever gross profit still went missing on top.
Keep the receipts from day one. Increased cost of working is settled on what you actually spent, and an unrecorded cash payment to a subcontractor is hard to prove six months later.
How long should your indemnity period be?
Long enough to rebuild, re-equip and win the work back, which is nearly always longer than the repair itself. Money.co.uk reports indemnity periods for business interruption running from 12 to 36 months.
Counting the recovery, not the repair
The trap is choosing 12 months because the unit could be rebuilt in six. Trade turnover does not snap back on the day the doors reopen.
A roofer who loses a yard in March misses a whole season, and the diary that was handed to competitors takes another year to rebuild.
| Indemnity period | Suits | The question it answers |
| 12 months | Small van-based trades with little plant | Can I replace everything within a year? |
| 24 months | Trades with a yard, stock or specialist machinery | How long to re-equip and refill the diary? |
| 36 months | Contract-led businesses on long procurement cycles | When does the next tender round come round? |
Indemnity period range published by money.co.uk, 2026.
Why is it sold alongside stock, plant and premises cover?
Because the material damage proviso makes it dependent on them. Buying interruption cover without the property section behind it leaves you with a policy that can never be triggered.
Why nobody sells it on its own
Underwriters price interruption cover off the property risk sitting underneath it. Without a schedule of buildings, stock and plant there is nothing to rate.
That is also why the section is cheap to add and expensive to arrange late. Bolted on at inception it is a percentage adjustment; asked for mid-term it is a fresh survey.
Building the package in the right order
Start with the physical assets: premises, contents, stock, plant, tools. Then add the interruption layer on top, in the same way liability sections are bolted onto a business insurance package.
The ABI sets out the same structure for business interruption, and the wording is where the detail lives rather than the quote screen.
A scaffolder with a yard full of tube and fittings has an obvious property base to build on, sitting in the same package as the public liability cover the contracts already demand.
A van-based sole trader with no yard has almost nothing to schedule. That is the honest dividing line between the trades this section suits and the ones it does not.
What is not covered by business interruption insurance?
The cost of the damage itself, anything with no physical trigger, and losses caused by trading conditions. Money.co.uk lists injury, cyber and data breach, and stock in transit among the standard exclusions.
The exclusions worth reading twice
- Repairing or replacing the damaged property, which belongs on the material damage section.
- Your own injury or illness, however completely it stops the business trading.
- Cyber incidents and data breaches, unless a separate cyber policy is in force.
- Goods damaged in transit, which needs goods in transit cover instead.
- Fines, penalties and any voluntary closure you decide on yourself.
- Damage caused by a peril the property section itself excludes, such as gradual water ingress.
Cyber is worth its own line. The Cyber Security Breaches Survey 2025/26, published by gov.uk in April 2026, found 42% of micro businesses had identified a breach, with a median cost of £0 and cyber cover held by 45% of them.
Wording matters more here than in most sections, as the FCA test case on Covid-19 business interruption showed when near-identical clauses produced opposite outcomes.
Frequently Asked Questions (FAQs)
No. Business interruption follows insured damage to property, while income protection and personal accident follow what happens to you.
Very rarely. The material damage proviso means it has to sit behind a property, stock or plant section that has admitted the underlying claim.
Not on a standard wording. With no damaged property there is no trigger, so a sole trader relying on their own hands should look at personal accident instead.
On insurance gross profit, meaning turnover less the costs that stop when trading stops. Fixed costs such as rent, wages and finance stay inside the figure.
Long enough to replace the assets and rebuild the order book. Money.co.uk reports periods running from 12 to 36 months, and 12 is often optimistic.
No. Commercial setbacks are not insured perils, however severe the effect on cash flow.
Not without separate cyber cover. Standard wordings exclude cyber incidents and data breaches because there is no physical damage behind them.
Only if you insure property the business genuinely depends on, such as a lock-up, stock or plant. With nothing physical to damage, there is little for the section to attach to.