For most UK property owners, the commercial buildings policy is often one of the largest lines of insurance they buy, though the right level of cover depends on lender requirements, lease obligations and how much risk the owner is comfortable retaining. Get it right and a fire, flood or subsidence loss is an inconvenience. Get it wrong - too low a sum insured, too short an indemnity period, the wrong wording - and the same event can destroy the asset.
This guide pulls together what every owner should understand before they sign next year's renewal. For our approach to placing this cover, see our commercial property insurance page.
Commercial Buildings Insurance: The Basics
Commercial buildings insurance covers the physical structure of a non-residential property - walls, roof, floors, foundations, fixtures and permanent services. It is typically bought by freeholders, long leaseholders, commercial landlords, owner-occupiers and property investors. It is almost always required as a condition of a commercial mortgage and as a condition of a commercial lease.
Most UK insurers write commercial buildings insurance on an "all risks" basis: any sudden and accidental damage is covered unless specifically excluded. Some older or higher-risk properties are written on a "specified perils" basis: only the perils named in the schedule are covered. All risks is broader and is usually the right starting point for most property owners.
Essential Cover
A modern UK commercial buildings policy should include, as standard:
- Fire, lightning, explosion and aircraft impact
- Storm, flood, escape of water and burst pipes
- Theft involving forcible and violent entry
- Malicious damage, riot and civil commotion
- Impact by vehicles or falling objects
- Subsidence, heave and landslip (usually with a higher excess)
- Property owners' liability of at least £5m
- Loss of rent for a sensible indemnity period
- Trace and access cover for water leaks
- Public authority and undamaged portion clauses
Five Gaps UK Owners Most Often Miss
1. Underinsurance on the rebuild sum
Rebuild costs in the UK have risen sharply since 2020. A sum insured last reviewed in 2017 or 2018 is likely to be inadequate today, though the exact position depends on the property and the wording in place. The "average" clause in your policy means that if you are underinsured by 30%, the insurer may only pay 70% of any claim - including a partial loss. A RICS reinstatement cost assessment, refreshed every three to five years, combined with a Day One uplift on the declared sum insured (often available at up to 50% of the buildings declared value), is one of the more effective protections against this risk.
2. Indemnity period set too short
A major fire at a commercial building rarely reinstates in less than 18 months once you account for planning, party-wall negotiations, listed-building consent, supply-chain delays and tenant reletting. A 12-month indemnity period - still the default on many UK policies - is rarely enough. Twenty-four months is a sensible default; 36 months is appropriate for complex, listed or specialist properties.
3. Unoccupancy conditions
Almost every UK commercial buildings policy restricts cover when a property is empty for more than 30 to 60 consecutive days. Cover is normally reduced to fire, lightning, explosion, aircraft and limited theft. Conditions usually apply: draining down water systems, securing the property, weekly inspections by a competent person, and notification to the insurer. Failure to comply is one of the most common reasons UK commercial property claims are reduced or declined.
4. Terrorism and flood
Standard wordings exclude terrorism. Cover is usually arranged separately through Pool Re, the UK government-backed terrorism reinsurer. For properties in central London, near transport hubs or close to recognisable targets, standalone terrorism cover is sensible. Flood is usually included as a standard peril, but properties in high flood-risk postcodes may face higher excesses or specific flood exclusions; Flood Re does not extend to commercial property.
5. Material change of risk not disclosed
Material changes - a new tenant trade, a vacant property, structural alterations, the installation of solar panels, a change in security arrangements - must be notified to the insurer mid-term, not waited until renewal. Non-disclosure is the second most common reason for declined claims after non-payment of premium.
Mortgage and Lease Requirements
Almost every commercial mortgage in the UK requires the borrower to insure the property for full reinstatement value with an insurer of acceptable financial strength, and to note the lender's interest on the policy. Lenders will typically ask for a copy of the policy schedule at drawdown and at each renewal. Failure to maintain compliant cover can trigger a default event under the loan agreement, regardless of whether a claim has occurred.
Lease obligations are similarly strict. The insurance clause in a typical full-repairing-and-insuring lease will list specific perils that must be insured against, set out the sum insured basis, require a stated minimum loss-of-rent period, and require the tenant to reimburse the premium. Reviewing the lease alongside the policy at every renewal is one of the more reliable ways to make sure the cover in place actually meets the contractual obligations.
Renewing Your Cover
Commercial buildings insurance is not a "set and forget" product. A meaningful renewal review should test six things every year:
- Is the reinstatement sum insured still adequate, given rebuild cost inflation?
- Does the indemnity period for loss of rent still reflect realistic reinstatement timescales?
- Have any tenant trades or occupations changed since the last renewal?
- Are there any new structural alterations, extensions or installations to disclose?
- Have the security, fire protection and management arrangements changed?
- Is the insurer still the right home for the risk, or has the market shifted?
Working With a Specialist Broker
A specialist broker compares wordings rather than just premiums, advises on sums insured and indemnity periods, manages disclosure properly and represents you at claim. Taurus Risk Management arranges commercial buildings cover for landlords, investors, property managers and owner-occupiers across the UK, and is independent of any single insurer.
Frequently Asked Questions
What is the difference between commercial buildings insurance and commercial property insurance?
Commercial buildings insurance covers only the structure. Commercial property insurance is a broader package that adds contents, stock, business interruption, money, glass and liability sections to the same schedule. Most UK insurers sell both on the same policy form.
Who is responsible for arranging commercial buildings insurance - landlord or tenant?
Almost usually the landlord. The cost is then recharged to the tenant under the lease, usually as a separate line on the rent demand or via the service charge. The lease will specify exactly what perils must be insured against.
How do I work out the rebuild sum insured?
It should reflect the full cost of rebuilding the property from the ground up - including professional fees, demolition, debris removal, public authority requirements and VAT where applicable. It is not the same as market value. A RICS reinstatement cost assessment is generally the most reliable basis.
Is terrorism included in commercial buildings insurance?
Standard UK wordings exclude terrorism. It is usually arranged separately, often through Pool Re for properties at higher risk. Brokers can add it as an extension at renewal.
Does commercial buildings insurance cover subsidence?
Most policies include subsidence, heave and landslip as standard, subject to a higher excess (typically £1,000 to £2,500) and to disclosure of any history of movement. Some high-risk postcodes attract additional terms.
What happens if the property is vacant?
Cover is restricted after a stated period (usually 30 to 60 days). Insurers must be notified, additional security and inspection conditions apply, and cover is typically reduced. Failure to comply can result in claims being declined.
