Fire and water damage prevention for commercial buildings

Fire is the less frequent and more expensive event, and water damage is the more frequent one. The Hartford's analysis of more than 1 million small-business policies from 2020 to 2024 found water and freezing damage were about 22% of claims at an average of $34,600, while fire claims averaged $80,000 and ranked as the costliest (The Hartford, December 9, 2025). For a building owner, prevention comes down to three things: keep fire protection systems in service, control the ignition sources your operation creates, and find and stop water before it runs for hours. The property policy rewards the first and punishes neglect of it.

What the numbers show

NFPA's Fire Loss in the United States During 2024 (November 2025) estimated 119,500 non-residential structure fires, causing about 170 civilian deaths, 1,020 injuries and $3.6 billion in direct property damage. That is 8% of reported fires and 20% of the property damage. Counts rose 1% from 2023, deaths rose 13% and injuries fell 22%. Direct damage excludes business interruption, lost customers and the price of rebuilding to current code, so the insured loss is larger.

Chubb's analysis of commercial water damage ranks the sources by loss size: roofs (about 15%), toilets (15%), sprinklers (14%), water heaters (11%), HVAC (8%), vacancy (8%), boiler and machinery (7%), sewer backup (5%), water tanks (4%) and water mains (3%) (Chubb). Notice that most of these are ordinary building systems failing, not storms. Flood from rising water is a separate peril with its own rules; see Commercial flood insurance: NFIP limits and private options.

Fire controls underwriters look for

The standards named are NFPA documents your insurer's loss control engineer, fire marshal or contractor will reference; the local fire code you adopt may differ. For a restaurant, NFPA 96 sets cleaning frequencies by cooking volume, from monthly for solid-fuel cooking to annually for low-volume operations, and kitchen fires are among the claims that drive the premium for Restaurant insurance.

Sprinklers work, and the policy depends on them

NFPA's U.S. Experience with Sprinklers (April 2024), using fires from 2017 to 2021, found sprinklers operated in 92% of fires large enough to activate them and were effective in 97% of those, so they worked in 89% of qualifying fires overall. The most common reason they failed to operate was that the system had been shut off. In sprinklered properties, fire spread stayed within the object or room of origin 94% of the time, compared with 70% in properties with no automatic extinguishing system. The same report quotes FM Global that loss costs are typically about 8.5 times smaller at manufacturing facilities with adequate sprinkler protection.

That is why the ISO Protective Safeguards endorsement, CP 04 11, exists. It adds a condition: you must maintain the protective devices or services listed in the schedule. The symbols are P-1 (automatic sprinkler system, including supervisory services), P-2 (automatic fire alarm connected to a central station or reporting to a fire alarm station), P-3 (security service making hourly rounds when premises are closed), P-4 (service contract with a private fire department), P-5 (automatic commercial cooking exhaust and extinguishing system) and P-9 (anything described in the schedule). The 10 12 edition states that the insurer will not pay for loss caused by or resulting from fire if, before the fire, you knew of a suspension or impairment in a scheduled safeguard and did not notify the insurer, or failed to maintain a safeguard you control in complete working order. If part of a sprinkler or cooking suppression system is shut off because of breakage, leakage, freezing or opened sprinkler heads, notification is not necessary if you restore full protection within 48 hours.

Three practical points follow.

• Know which symbols are on your policy. The schedule may list buildings or premises; a building you added or a system you changed is a place to check.
• Create an impairment procedure. A written process for shutting a valve for repairs, notifying the broker, posting a fire watch and restoring service inside 48 hours is what the endorsement assumes.
• Mind the exact wording. This is a fire-loss exclusion in the standard ISO form, so water or other losses are decided by other clauses, and carrier forms vary.

Water damage: sources and controls

Water losses are slow to notice and fast to spread, especially in empty or unattended buildings.

1. Find the shutoffs. Label the main, floor and equipment shutoff valves, and teach more than one person where they are. The Hartford lists this among its first steps.
2. Install leak sensors at water heaters, HVAC condensate pans, mechanical rooms, restrooms, server rooms and under ice machines. Add flow-based monitoring and automatic shutoff valves where a leak would be costly. Chubb recommends sensors and shutoff valves for early notification. See IoT sensors and commercial property insurance.
3. Replace on a schedule. Chubb notes toilet hoses should be replaced every three to five years and water heaters before the roughly 7-to-10-year failure window.
4. Maintain the roof and drains. Roof leaks are the largest single source in Chubb's list. Clear drains and remove snow and ice from roofs and overhangs.
5. Protect against freezing. Keep indoor temperatures up in cold weather; insulate exposed lines; know the dry-pipe or antifreeze status of sprinkler lines.
6. Treat vacancy as a hazard. Shut off water where it is not needed and install temperature sensors; see vacant building insurance and the vacancy clause.
7. Control sewer backup with backflow valves and clog-prone line maintenance.
8. Test sprinklers under the NFPA 25 schedule; sprinkler leaks are 14% of Chubb's commercial water losses.

What the standard form says about water

On the standard ISO special causes of loss form CP 10 30 (09 17 edition), several clauses decide water claims. The form excludes continuous or repeated seepage or leakage of water that occurs over 14 days or more; a slow leak behind a wall is a maintenance item, not a covered loss. It excludes water that leaks from plumbing, heating, air conditioning or other equipment (except fire protective systems) because of freezing unless you do your best to maintain heat in the building or you drain the equipment and shut off the supply. It also excludes flood, surface water, mudslide, and water that backs up from a sewer, drain or sump, which is where an optional backup endorsement or separate flood policy matters. A coverage extension pays the cost to tear out and replace part of the building to repair the system that leaked, without increasing the limit. Mold coverage is limited. Other editions and carrier forms differ, so read your policy; see basic, broad and special causes of loss forms: what each covers and commercial property insurance: what it covers and what it doesn't.

Business interruption also matters. A water loss that closes a store for weeks triggers the waiting period and the period of restoration; see business interruption insurance: how business income coverage works.

A hypothetical

Say a 40,000-square-foot strip center in Georgia has one vacant unit and five tenants. A water heater in the vacant unit fails on a Friday night and runs until Monday morning, flooding two neighboring suites. Four questions decide how the claim goes. First, was the leak sudden or long-running? A three-day discharge is not the 14-day seepage the exclusion targets, but maintenance records showing a slow drip for months would change the discussion. Second, how does the vacancy condition apply? In the standard CP 00 10 form the condition looks at the whole building when the policy is issued to the owner, and a building counts as vacant unless at least 31% of its square footage is rented and used for customary operations or used by the owner. With five of six units occupied, this center is not vacant under that test, but if the whole building had sat empty for more than 60 days, water damage would be among the causes of loss the form stops paying for, and other covered losses would be cut by 15%. Third, whose policy pays for the neighbors' contents and income? That turns on the leases, the tenants' own coverage and the owner's liability policy. Fourth, would a sensor or a weekly walkthrough have caught it? A $200 sensor and an inspection log cost far less than the dispute. See vacancy clause and Landlord insurance.

Working with your insurer

Ask your broker which fire and water controls earn credits; the discount and appetite vary by carrier. Documented sprinkler maintenance, central station alarms, hood cleaning contracts and leak shutoff systems all show up on risk engineering reports. Prepare for a loss control inspection by having inspection tags, service contracts and the impairment log ready. Mitigation credits are covered in mitigation credits and resilient construction for commercial property.

Key takeaways

• Fire is costlier and water damage is more frequent: The Hartford's 2020 to 2024 small-business data show water and freezing at about 22% of claims and fire averaging $80,000.
• Sprinklers operated effectively in 89% of qualifying fires in NFPA's 2017 to 2021 data; the most common failure was a system that had been shut off.
• CP 04 11 makes maintaining scheduled safeguards a condition of fire coverage; notify your insurer of impairments and restore protection within 48 hours where that clause applies.
• The standard property form excludes seepage over 14 days, freeze damage when heat was not maintained, and sewer backup, so prevention and the right endorsements matter.
• Know where the shutoffs are, install leak sensors, and treat vacant space as a hazard.