I’ve been writing about commercial property for long enough to notice the same question coming up again and again: who pays for what when something goes wrong with the building itself? It sounds simple, but the answer can cost you tens of thousands if you get it wrong. A burst pipe, a fire, or storm damage can expose gaps between what the landlord insures and what the tenant assumes is covered — and those gaps land squarely on your balance sheet.
Underinsurance is one of the most expensive mistakes a commercial tenant or landlord can make. If your building is valued at £1 million to rebuild but you only insure it for £700,000, a £200,000 claim might only pay out £140,000 — leaving you to find the other £60,000 from your own pocket. That’s not a hypothetical scenario; it’s how the “average” clause works in practice. Here’s what you actually need to know.
Understanding commercial building insurance responsibilities
The most important thing to grasp is that commercial building insurance is not a single product. It’s a split responsibility written into your lease. The building owner insures the structure — walls, roof, floors, and any landlord-owned fixtures. The tenant insures everything inside: stock, equipment, office furniture, and their own public liability. This division is standard, but the exact boundaries depend entirely on the type of lease you have.
In a multi-let building, the landlord insures the whole structure and each tenant pays their share through the service charge. That sounds straightforward, but the complexity comes when you need to understand exactly what perils are covered, whether your fit-out is included, and what happens if the building is damaged and you can’t trade. I’ve seen tenants assume their landlord’s policy covers their custom shelving and kitchen equipment — it doesn’t. That’s your responsibility.
Why getting this wrong costs real money
The financial consequences of a gap in cover are not abstract. Consider what happens if a fire damages your unit in a multi-let building. The landlord’s policy pays to rebuild the structure, but your stock, your bespoke shop fit-out, and your lost trading income are not covered. You need your own contents and business interruption insurance for that. According to Sprintlaw’s guide to commercial building insurance, failing to meet minimum insurance requirements in your lease can put you in breach of contract and risk termination of your tenancy.
Here’s a scenario that comes up more often than you’d think. A tenant runs a café and installs a deep fat fryer. That changes the building’s risk profile significantly. The landlord’s insurer may need to be notified, and the premium could increase. If the tenant doesn’t tell anyone and a fire starts, the insurer might refuse the claim entirely. That’s not just a financial hit — it’s a dispute that can end the lease. For more on how to handle these relationships, building a successful landlord-tenant partnership is worth reading.
Where tenants and landlords trip up
Insuring based on market value instead of rebuild cost
This is the most common mistake. You bought the building for £800,000, so you insure it for £800,000. But the reinstatement cost — what it would actually cost to demolish, clear debris, pay architects, and rebuild to current building regulations — could be £1.2 million. The difference is underinsurance, and the average clause will reduce every claim you make. A professional rebuild valuation every few years is the only reliable fix.
Not notifying the insurer of changes in use
A warehouse that becomes a spray shop, a café installing commercial cooking equipment, or a unit sitting vacant for months — each of these changes the risk profile. Many policies require you to notify the insurer of material alterations. If you don’t, a claim can be declined. This is particularly relevant for tenants who overlook hidden costs of renting commercial space like insurance notification requirements.
Assuming the landlord’s policy covers your fit-out
Your lease might say the landlord insures the “building”. But your custom joinery, kitchen equipment, or specialist flooring is usually classed as tenant’s improvements or contents. Unless you’ve specifically agreed otherwise, you need your own policy for those items. A dispute over who pays for a damaged fit-out can delay reinstatement by months.
Ignoring the rent suspension clause
Most commercial leases include a clause that suspends rent if the premises are damaged by an insured risk and become unfit for occupation. But the suspension only lasts until reinstatement. If the building is underinsured and the landlord can’t afford to rebuild, the rent restarts even though you can’t trade. That’s a double hit — no income and a rent bill. Make sure the sum insured is adequate to avoid this trap.
→ Scroll right to see all columns
| Lease Type | Who Insures Structure | Who Insures Contents |
|---|---|---|
| Full Repairing and Insuring (FRI) | Landlord arranges; tenant reimburses premium | Tenant |
| Internal Repairing | Landlord | Tenant |
| Multi-let (service charge) | Landlord insures whole building; tenants pay share | Tenant |
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How to get your commercial building insurance right
Get a professional rebuild valuation
This is the single most important step. A chartered surveyor will calculate the reinstatement cost, including demolition, debris removal, professional fees, and compliance with current building regulations. Do this when you buy the property and repeat it every three to five years, especially after any refurbishment. Index-linking your sum insured helps, but it’s not a substitute for a proper valuation. If you’re unsure about the legal side of your lease, speaking with a real estate lawyer can clarify your obligations before you commit to a policy.
Understand what your lease actually says about insurance
Your lease’s insurance clause will specify the perils that must be covered (fire, flood, storm, etc.), whether the policy must be with a “reputable insurer”, and how you reimburse the premium. It may also require the tenant to be noted on the policy and for the insurer to waive subrogation rights against the tenant. If you’re a tenant, check whether the lease requires “all risks” cover — in practice, most modern policies are “specified perils” with optional extensions. If there’s a mismatch, negotiate before you sign. For more on lease terms, essential UK legislation every commercial tenant should know covers the legal framework.
Check for waiver of subrogation and tenant’s interest clauses
If a fire starts due to tenant negligence, the landlord’s insurer can pay the claim then pursue the tenant for recovery — this is called subrogation. A waiver of subrogation clause prevents this, and it’s standard in many commercial leases. Similarly, having the tenant’s interest noted on the policy means the insurer will notify the tenant if the policy is cancelled or changed. Without these clauses, you’re exposed to litigation from your own landlord’s insurer.
Don’t forget business interruption and loss of rent
If the building is damaged and you can’t trade, your building insurance won’t replace lost income. You need separate business interruption insurance (as a tenant) or loss of rent cover (as a landlord). Most leases require loss of rent cover for a defined indemnity period — commonly 12 to 36 months — because it supports the rent suspension clause. Make sure the indemnity period is long enough to cover the time it would take to rebuild. A property lawyer can help you check that the periods in your lease and your policy match up.
Review your cover when occupancy changes
Hybrid working, vacant units, or a change of tenant all affect risk. If a unit sits empty, the risk of arson and escape of water increases. If a tenant switches from office use to light industrial, the fire risk changes. Many policies require you to notify the insurer of material alterations. Set a reminder to review your insurance at every lease renewal or when a tenant moves in or out.
Do I need commercial building insurance if I’m a tenant? ▾
What happens if my landlord’s building insurance is cancelled? ▾
Is commercial building insurance legally required? ▾
What’s the difference between reinstatement cost and market value? ▾
Can I arrange my own building insurance as a tenant? ▾
Getting commercial building insurance right comes down to one thing: knowing exactly where the responsibility sits and making sure the sums insured are adequate. Start with a professional rebuild valuation, read your insurance clause carefully, and check for waiver of subrogation. If you’re a tenant, don’t assume the landlord’s policy covers your contents or lost income. If you’re a landlord, review your sums insured every year and notify your insurer of any change in occupancy or use. If this was useful, you might also want to read top maintenance tips for renting a commercial space in the UK.
Sources and Further Reading
How to negotiate a lease buyout for your business space — If your current lease terms on insurance are unfavourable, this guide covers how to renegotiate or exit.
Tips for securing your rent deposit in the UK — Insurance disputes can affect your deposit; this article explains how to protect it.
A building owner’s guide to insurance for commercial leases. Insure24, 2024.
Commercial building insurance: key legal considerations for UK businesses. Sprintlaw, 2024.
Commercial landlord insurance: what business let properties need in 2026. Cover4LetProperty, 2025.
