A complete apartment building insurance program covers the building, lost rents, owner liability, code-upgrade costs after a partial loss, building-system failures, and an umbrella over the underlying liability. This page breaks down each coverage line in detail: what it pays for, what it excludes, what limits to expect, and where admitted ISO forms differ from Lloyd's and domestic E&S forms. It also covers commonly-misunderstood endorsements (water, earthquake, flood, sewer backup) and the carrier landscape in 2026.
Key Takeaways
- Six core coverages and six or more commonly-required endorsements make up a complete program.
- Property is the biggest line by premium; liability is the biggest line by claim severity.
- Water damage is the most frequent claim, often sub-limited and separately deductible.
- Earthquake, flood, and wildfire are typically separate policies or endorsements, not automatic.
- Coverage language differs sharply between admitted ISO Commercial Property forms and Lloyd's / E&S manuscript forms.
Property Coverage
Property coverage pays for direct physical loss or damage to the building structure, owner-supplied appliances, common-area furniture, and signage. It is written on either a Special Form (open perils, everything covered except specifically excluded) or Named Perils form (only listed perils covered). Special Form is the default for newer admitted-market apartments; Named Perils shows up on older frame buildings and some E&S placements.
Key property coverage decisions:
- Replacement cost vs actual cash value (ACV): lender-required is replacement cost. ACV depreciates the value, dramatically reducing roof and HVAC claims on older buildings. A depreciated-roof endorsement applied to a 15+ year roof can reduce a roof claim by 40% to 70%.
- Coinsurance: 80%, 90%, or 100% coinsurance penalty if TIV is undervalued. An agreed-value endorsement waives the coinsurance penalty when the carrier and insured agree the TIV is correct.
- TIV calculation: replacement cost per square foot × total square feet, plus soft costs (architect fees, demolition, ordinance or law). For most 2026 apartment buildings, replacement cost runs $180 to $400 per square foot.
- Per-occurrence vs per-location vs blanket limits structure: blanket limits across multiple buildings provide diversification benefit at scale.
General Liability
General liability covers third-party bodily injury and property damage on the premises and from the building's operations. The main exposures:
- Slip-and-fall in lobby, parking lot, common area
- Pool drowning, hot tub injury
- Dog-bite by a resident's pet (subject to breed exclusions)
- Elevator injury
- Common-area defect (loose handrail, broken stair)
Typical limits are $1M per occurrence and $2M aggregate, increased to $1M/$3M for 100+ unit buildings.
Common GL exclusions that owners often miss:
- Assault and battery: routinely excluded, often endorsed back in for hospitality-adjacent or urban buildings
- Lead-based paint: excluded on most forms; pre-1978 buildings need specific endorsement or separate coverage
- Mold: sub-limited (typically $15K to $50K)
- Habitability beyond GL's basic premises trigger: sub-limited
- Professional services (architect, contractor work done by the owner directly)
Coverage parts within GL: premises and operations, products and completed operations, personal and advertising injury (libel, slander, copyright infringement), and medical payments (no-fault payments to injured visitors).
Business Income / Loss of Rents
Business income covers the rents lost while units are uninhabitable after a covered loss, plus extra expenses to continue operations.
Key parameters:
- Period of indemnity: 12 months minimum (lender requirement), 18 to 24 months for coastal Florida or buildings where rebuild realistically takes a year+
- Coverage: actual loss sustained, with vacancy and collection-loss adjustments
- Extra expense: cost to continue operations (security, temporary leasing office, additional staffing)
- Waiting period (time deductible): typically 72 hours before coverage kicks in
Lost rents is one of the most-frequently-undervalued coverage lines on small-owner policies. Carriers calculate based on gross potential rent minus normal vacancy and collection loss; owners sometimes insure only net rents, which produces a coinsurance penalty at claim time.
Ordinance or Law (A / B / C)
Ordinance or law coverage pays the gap when a partially damaged building must be rebuilt to current code rather than its original condition. It has three coverage parts:
- Coverage A: undamaged portion that must be demolished to comply with code
- Coverage B: cost of demolition and debris removal of the undamaged portion
- Coverage C: increased cost of construction to bring the building up to current code
Examples that make ordinance or law indispensable on older buildings:
- NYC Local Law 11 (facade): a 1960s building with a partial-loss claim may have to be rebuilt with current facade and parapet code
- California seismic retrofit: post-1980 code requires structural upgrades that the original building does not have
- Florida wind upgrades: post-2002 building code requires impact-rated windows and reinforced roof-to-wall connections
Typical limits: $100K to $500K per coverage part. Older buildings carry $1M+ across A/B/C.
Equipment Breakdown (Boiler & Machinery)
Equipment breakdown covers the failure of building systems that a standard property form excludes as "mechanical breakdown":
- Boilers, chillers, hot water heaters
- Elevators (hydraulic failure, motor failure)
- Electrical switchgear, transformers, surge events
- HVAC compressors
- Pump motors
A boiler failure in February in a 40-unit Northeast building is a classic claim type, frequently $50K to $250K all-in (parts, labor, temporary heat, lost rents). Without equipment breakdown coverage, the carrier denies under the mechanical breakdown exclusion.
Typical limit: $50K to $500K per breakdown, scaleable. Includes business income loss from the breakdown.
Umbrella / Excess Liability
Commercial umbrella sits over the underlying GL, employers liability (Part B of workers comp), and any commercial auto. It provides excess limits on a follow-form basis.
- Entry: $5M
- Institutional / agency lender: $10M to $25M
- High-exposure buildings (pool, playground, gym, security history): $10M+ regardless of size
A personal umbrella does not extend over commercial GL. Owners frequently discover at claim time that their $5M personal umbrella does not respond to a tenant's $3M lawsuit against the building's LLC.
Required and Common Endorsements
The endorsements that most apartment buildings need but that are rarely automatic:
- 1.Sewer backup — not automatic; almost always needed. Typical limit $25K to $250K.
- 2.Water damage sub-limits and deductibles — $10K to $50K separate deductible on older buildings
- 3.Wind / hail percentage deductible — CAT states, 1% to 5% of TIV per occurrence
- 4.Wildfire deductible — California WUI, sometimes 5%+ of TIV
- 5.Earthquake — separate policy in California, often E&S
- 6.Flood — NFIP for Special Flood Hazard Areas (capped at $500K commercial), plus excess flood for higher TIV
- 7.Pollution / environmental — older buildings with underground storage tanks or dry-cleaner tenants
- 8.EPLI — if owner directly employs staff
- 9.Cyber — if owner takes credit-card rent payments through an online portal
What Apartment Building Insurance Does NOT Cover (Without Endorsement)
The exclusions to know:
- Earthquake (separate policy, particularly important in California)
- Flood (rising water — separate NFIP policy required in SFHA)
- Pollution / mold beyond sub-limit
- Cyber events (data breach, ransomware on the owner's systems)
- Tenant's personal contents (renters insurance is the tenant's responsibility)
- Construction defect and contractor errors (separate professional liability, contractor's pollution & errors)
- Intentional acts by the insured
- Wear and tear, gradual leaks, mechanical wear
Admitted vs E&S Coverage Forms
A meaningful share of US apartment buildings, particularly older frame, prior-loss, or CAT-zone buildings, ends up in the surplus-lines (E&S) market. The form differences matter:
- Admitted (ISO Commercial Property forms): standardized, predictable, state-regulated wording. Easier coverage comparison and claim adjudication.
- E&S (Lloyd's syndicates, domestic specialty): manuscript wording, varies materially by carrier. Watch specifically for exclusions on water damage, mold, wildfire, theft, and habitability. The LMA 5018 fungi exclusion on many Lloyd's forms is more restrictive than the ISO mold sub-limit.
Owners with E&S placements should compare actual policy wording line by line, not just the limits and premium. A 20% premium savings on an E&S form with broader exclusions is usually a worse outcome.
Carrier Landscape: Who Writes Apartment Building Coverage in 2026
Admitted carriers (where appetite remains):
- Travelers
- Liberty Mutual
- Zurich
- Nationwide
- CNA
- Selective (regional)
- Cincinnati Financial
- Erie (regional)
- Chubb (premium / HNW habitational)
Specialty / E&S markets:
- Lloyd's syndicates (placed through US wholesalers)
- IAT Insurance Group
- Aspen
- Tokio Marine HCC
- Westchester (Chubb)
- Argo
- Markel Specialty
- AXIS
Wholesalers (where retail brokers source E&S):
- RT Specialty (Ryan Specialty)
- Burns & Wilcox
- AmWINS
- CRC Group
- Brown & Riding
Appetite changes quarterly. State Farm's March 2024 California commercial apartment non-renewal of ~42,000 policies is the most visible recent example, but smaller appetite shifts happen at every Jan 1 and July 1 reinsurance treaty renewal.
Coverage Comparison Across Forms
The same building can have materially different effective coverage on three different policies at the same premium. The questions to ask:
- What's the named-storm or wildfire deductible structure?
- What's the water-damage sub-limit and separate deductible?
- What's the mold sub-limit, and is the fungi exclusion ISO or LMA 5018?
- Is sewer backup endorsed?
- Is equipment breakdown included or separate?
- What ordinance or law sub-limits apply?
- What's the GL aggregate, and is it reinstated at any point?
A side-by-side coverage spreadsheet is the only honest way to compare apartment building quotes.
Related Pages
- Apartment Building Insurance — pillar guide
- Apartment Building Insurance Cost — pricing detail
- Apartment Building Owners Insurance — owner-focused detail
- Habitational Insurance — broader habitational market
- Apartment Building Water Damage Claim — water claim mechanics
- California Commercial Property Insurance — earthquake and wildfire
- Florida Commercial Property Insurance — wind and flood
- California FAIR Plan DIC Wrap — DIC mechanics
- Hotel Property Insurance — same coverage form parallel
Frequently Asked Questions
What is included in apartment building insurance?
Apartment building insurance includes property (building, contents, signage), general liability, business income / lost rents, ordinance or law, equipment breakdown, and a commercial umbrella. Commonly-added endorsements include sewer backup, water-damage sub-limits, wind / hail percentage deductibles, earthquake (in California), flood (in SFHA), and environmental liability.
What is habitational insurance?
Habitational insurance is the industry term for the commercial property and liability category covering residential-occupancy buildings, including apartments, condo association master policies, student housing, dorms, senior housing, assisted living, and military housing. Apartment building insurance is the most common habitational sub-segment.
Is earthquake covered on an apartment building policy?
No, earthquake is excluded on virtually all standard apartment building policies. California apartment owners almost always need a separate earthquake policy, typically placed through the E&S market or the California Earthquake Authority for personal-lines properties. Lenders may require earthquake on certain California buildings.
Does apartment insurance cover tenant belongings?
No. Tenant belongings are the tenant's responsibility, covered by their own renters insurance. The apartment building policy covers the building, common areas, and owner-supplied appliances and fixtures only. Most leases require tenants to carry renters insurance.
Is mold covered?
Mold is typically sub-limited on apartment building policies, with $15K to $50K being common. The base ISO form sub-limits mold tightly, and Lloyd's / E&S forms often use the more restrictive LMA 5018 fungi exclusion. Owners with older buildings or significant water-damage history should negotiate the mold sub-limit upward where the market allows.
What is ordinance or law coverage?
Ordinance or law coverage pays the gap when a partially damaged building must be rebuilt to current code rather than its original condition. It has three coverage parts: Coverage A pays for the undamaged portion that must be demolished, Coverage B pays for demolition and debris removal of the undamaged portion, and Coverage C pays the increased cost of construction to meet current code.
What carriers write apartment building insurance?
Major admitted carriers for apartment building insurance in 2026 include Travelers, Liberty Mutual, Zurich, Nationwide, CNA, Cincinnati Financial, and Chubb. Surplus-lines and specialty markets include Lloyd's syndicates, IAT, Aspen, Tokio Marine HCC, Markel, and AXIS, placed through wholesalers RT Specialty, Burns & Wilcox, AmWINS, and CRC. Appetite varies sharply by state, building age, construction, and claims history.
Sources
- ISO Commercial Property forms, Verisk / ISO product documentation
- Fannie Mae Multifamily Selling and Servicing Guide
- Freddie Mac Multifamily Seller/Servicer Guide
- FEMA NFIP, commercial flood insurance limits
- HUD lead-based paint disclosure rule (24 CFR Part 35)
- Insurance Information Institute, commercial property and habitational claim data
- Insurance Journal, carrier non-renewal coverage
Last updated: May 22, 2026.