Block Insurance With Commercial Units
When a block contains commercial space, the trade below usually decides how the whole building is rated.
Reviewed by the Landlord Quote editorial team · Last updated 14 September 2026
In short
- One mixed-use policy normally covers both the flats and the commercial units.
- The commercial trade — particularly food and late-night uses — drives the rating.
- Underwriters want the split between residential and commercial floor area.
- Fire separation between the commercial and residential parts is a central question.
- This is a specialist commercial risk; personal-lines comparison sites do not write it.
How is a block with commercial units insured?
Under a single mixed-use property owners' policy covering the whole building — the flats, the commercial units, the communal parts and property owners' liability — rated primarily on the commercial trade taking place at ground floor.
Insuring the whole building under one contract avoids the gaps that appear when residential and commercial parts are insured separately, particularly for the roof, structure and shared services.
Underwriters will ask for the proportion of floor area or rental income that is commercial versus residential. A building that is largely residential with one small shop is treated very differently from one that is mostly offices with two flats above.
Things to consider
- Commercial tenants' own contents, stock and business interruption are insured by the tenants, not the building policy.
- Check who is responsible for the shopfront glass under the commercial lease.
- Empty commercial units change the risk and must be declared.
Read next: Who insures a block of flats · Freeholder insurance explained
Which commercial trades make a block harder to insure?
Trades with a fire, escape-of-water or public-order exposure — hot-food takeaways, restaurants, commercial kitchens, launderettes, dry cleaners, late-night bars, garages and some workshops are the ones underwriters scrutinise most.
Cooking with hot oil directly below sleeping accommodation is the classic concern. Insurers look for extraction ducting cleaned to a recognised standard, fire suppression over the range, adequate compartmentation between the unit and the flats, and a linked alarm system.
It does not make the building uninsurable — plenty of insurers write flats over takeaways — but it narrows the market and makes a properly presented submission more valuable.
Read next: Working with a specialist broker
Who pays for insurance in a mixed-use block?
The party with the insuring obligation pays the insurer and recovers the cost from the occupiers: residential leaseholders through the service charge, and commercial tenants through the insurance rent provision in their business leases.
Commercial leases usually deal with insurance separately from residential ones, often requiring the tenant to reimburse the premium attributable to their unit. Apportioning that fairly between the commercial and residential parts is a common source of dispute, so the basis should be recorded.
Read next: Buildings insurance and the service charge
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