I’ve been writing about commercial property for long enough to notice a pattern: most people who rent a shop, office, or workshop spend weeks negotiating the lease terms but barely glance at the insurance section. That’s a mistake that can cost tens of thousands. Around one in three commercial properties in the UK is underinsured, which means a significant fire or flood could leave the tenant personally liable for a six-figure shortfall. Understanding what you’re actually on the hook for — and what your landlord’s policy does and doesn’t cover — is the difference between a manageable disruption and a business-ending loss.
Here’s what you actually need to know.
How commercial property insurance responsibilities are split
The single most important thing to understand is that commercial leases almost never leave everything to one party. In a standard arrangement, the landlord insures the building structure — walls, roof, foundations, common areas — and the tenant insures everything inside that they brought or installed. The tenant then reimburses the landlord for the building insurance premium, usually through something called an “insurance rent” or as part of the service charge. That’s the baseline.
But leases vary. Under a Full Repairing and Insuring (FRI) lease, you take on responsibility for repairs and still reimburse the landlord’s building insurance. Under an internal repairing lease, the landlord keeps responsibility for the structure and external elements, while you cover internal repairs and your own property. In multi-let buildings, the landlord insures the whole building and each tenant pays their share through the service charge. I’d always recommend getting a small business lease reviewed by a solicitor before signing, because the insurance clause is where hidden costs live.
What happens when the building is underinsured
This is the risk that keeps property lawyers awake. Most commercial buildings policies include an “average” clause. If the building is insured for less than its full reinstatement cost, any claim is reduced proportionally. The example from a building owner’s guide to insurance for commercial leases makes it brutally clear: a building worth £1,000,000 to rebuild, insured for £700,000, suffers a £200,000 fire claim. The insurer pays 70% — £140,000. The tenant, whose business is disrupted and whose stock is destroyed, is left chasing the landlord for the £60,000 shortfall, or worse, absorbing it themselves.
What I tend to notice is that tenants rarely ask to see the building’s reinstatement valuation. It feels like the landlord’s problem. But if you’re paying the insurance rent, and your business depends on that building being operational, it’s very much your problem too. Ask for the valuation at the start of the lease and again at each renewal. If the landlord can’t produce one, that’s a red flag.
The type of property matters here. A warehouse lease carries different risks than a high-street shop. Warehouses often have large floor areas, high ceilings, and extensive racking that can make fire spread faster. Shops have frequent public access, display changes, and stock deliveries during opening hours — all of which increase the chance of accidental damage or injury. Offices, by contrast, are often seen as lower risk, but modern hybrid working patterns mean fluctuating occupancy, which can affect how safety measures are applied.
Where tenants get the insurance wrong
Assuming the landlord’s policy covers your contents
This is the most common misunderstanding. The landlord’s building insurance covers the structure and landlord-owned fixtures. Your stock, equipment, furniture, and tenant improvements are your responsibility. If a burst pipe ruins £50,000 of stock and you have no contents insurance, you bear the full loss. A commercial landlord insurance policy typically covers fire, storm, escape of water, and theft for the building — but not for your business assets.
Ignoring the fit-out insurance gap
Tenants often spend significant money fitting out a space: partitions, flooring, specialist electrical work, kitchen installations. The question is whether these count as building or contents. If the lease is silent, you can end up in a dispute where neither policy covers them. The safest approach is to clarify in the lease: the landlord insures the original structure, you insure your fit-out and contents. But some fit-out becomes “fixtures” and blurs the line. Get it in writing.
Not checking the rent suspension clause
Many commercial leases include a clause that suspends rent if the premises are damaged by an insured risk and become unfit for occupation. But not all do, and the ones that do often have conditions — time limits, a requirement that the landlord actually has sufficient insurance proceeds to reinstate, or a tenant termination right if reinstatement takes too long. If your lease doesn’t have a rent suspension clause, you could be paying full rent on a building you can’t use for months.
Overlooking subrogation and waiver of recourse
If a fire starts because of something your employee did — say, leaving a heat-producing tool unattended — the landlord’s insurer might pay the claim and then pursue your business to recover the cost. That’s subrogation. Many commercial leases include a waiver of subrogation clause to prevent this, but not all do. If yours doesn’t, your liability insurance needs to cover this exposure. A surveyor’s fee assessment can help identify these gaps before they become problems.
→ Scroll right to see all columns
| Risk | Who typically covers it | What to check |
|---|---|---|
| Building structure (walls, roof, foundations) | Landlord | Reinstatement valuation is current |
| Common areas (entrances, stairwells, lifts) | Landlord | Property owner’s liability is included |
| Tenant contents (stock, equipment, furniture) | Tenant | Sum insured covers full replacement cost |
| Tenant fit-out (partitions, flooring, kitchens) | Depends on lease | Lease specifies who insures improvements |
| Business interruption / loss of rent | Landlord (building) / Tenant (business) | Indemnity period is long enough |
| Liability for injury to public | Landlord (common areas) / Tenant (premises) | Both policies have adequate limits |
How to get your commercial property insurance right
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Get a professional rebuild valuation before you sign
Don’t rely on the purchase price or market value. Buildings insurance should be based on the reinstatement cost — what it would actually cost to demolish, clear debris, pay professional fees, and rebuild to current building regulations. That figure can be significantly higher than the market value, especially for older buildings. Ask your landlord for their most recent valuation. If they don’t have one, insist on getting one before you commit to the insurance rent. A real estate lawyer can help you negotiate this into the lease as a condition.
Clarify who insures the fit-out in writing
Before you spend money on partitions, flooring, or specialist installations, get a clear written agreement about who insures them. The safest structure is: the landlord insures the original structure, you insure your fit-out and contents. But if the fit-out becomes a “fixture” under the lease, it may fall to the landlord’s policy — or neither. A tenant landlord lawyer can review the lease language and tell you where the gap is.
Check the rent suspension clause for conditions
Find the clause in your lease that deals with what happens if the premises are damaged. It should say that rent is suspended until the building is reinstated. But read the small print: some clauses only suspend rent if the landlord has enough insurance money to rebuild, or only for a fixed period. If the clause is missing or weak, negotiate an amendment before signing. This is one of those details that feels theoretical until your building floods and you’re still paying rent on a shell.
Review sums insured at every renewal
Buildings depreciate and appreciate. Rebuild costs change with inflation and regulatory updates. If your landlord’s sum insured hasn’t been reviewed in three years, it’s almost certainly too low. Make it a condition of the lease that the landlord provides an updated reinstatement valuation annually. If they won’t, consider whether the risk is worth taking. A service charge breakdown should itemise the insurance cost separately so you can verify it.
Consider emerging risks: hybrid working and terrorism cover
Hybrid working patterns are changing how commercial properties are used. Fluctuating occupancy affects fire risk, security, and how safety measures are applied. If your office has days where only a handful of people are present, make sure your insurer knows. Separately, some tenants — particularly banks, national brands, and city-centre locations — may need terrorism cover. In the UK, this is often arranged through Pool Re backed solutions. Check whether your lease requires it and whether your landlord’s policy includes it.
Frequently asked questions about commercial property insurance
Can I use my own building insurance instead of paying the landlord’s insurance rent? ▾
What happens if the landlord’s insurer goes bust mid-lease? ▾
Do I need business interruption insurance if the landlord has loss of rent cover? ▾
Is accidental damage cover worth it for a commercial tenant? ▾
What’s the difference between “specified perils” and “all risks” cover? ▾
Can I be held liable for damage caused by my employee’s negligence? ▾
Sources and Further Reading
Brexit commercial property: what’s changed for UK renters — How regulatory shifts have affected lease terms and insurance requirements since 2021.
Rethinking commercial space priorities in the UK — Why location matters less and lease flexibility matters more for modern tenants.
Commercial landlord insurance: what business-let properties need in 2026. Cover4LetProperty, 2025.
A building owner’s guide to insurance for commercial leases. Insure24, 2025.
