Property Insurance Exclusions: What Standard Policies Don’t Cover and How to Fill the Gaps

The ISO HO-3 Special Form is an open-perils policy on the dwelling — it covers all direct physical loss unless specifically excluded. The exclusion list is therefore the most important section of the policy for risk management purposes: it defines the boundaries of coverage and identifies where separate policies, endorsements, or self-insurance programs are required to complete the risk transfer. The exclusions most commonly encountered in property claims — and most likely to produce unexpected coverage gaps at claim time — are flood, earth movement, ordinance or law, sewer backup, service line, and mold.

For a full understanding of the coverage structure that these exclusions carve out from, see Property Insurance Policy Structure: Coverage A, B, C, D and How Each Applies. For the valuation methods that apply when coverage does exist, see Property Insurance Claims Valuation: ACV, RCV, and Agreed Value Methods.

Flood Exclusion

The flood exclusion is the single largest source of uninsured property loss in the United States. ISO HO-3 and standard commercial property policies exclude all damage from surface water, overflow of bodies of water, waves, tidal water, storm surge, flooding, and water that backs up from any of these sources — regardless of the cause of the flooding. The exclusion applies whether the flood results from a named hurricane, a 500-year rainfall event, spring snowmelt, or a dam failure upstream.

Definition — Flood (ISO HO-3 Exclusion): Flood, surface water, waves, tidal water, overflow of a body of water, or spray from any of these, whether or not driven by wind; water that backs up through sewers or drains from flood; and water below the surface of the ground including water that exerts pressure on a foundation. Excluded under standard ISO HO-3, ISO HO-5, and ISO CP commercial property forms.

The National Flood Insurance Program (NFIP), administered by FEMA under the National Flood Insurance Act of 1968, is the primary mechanism for residential flood insurance in the United States. NFIP provides coverage in participating communities (over 22,000 communities as of 2025) for residential structures up to $250,000 building coverage and $100,000 contents coverage. NFIP premiums are set by FEMA’s Risk Rating 2.0 methodology, implemented in 2021, which bases premiums on individual property flood risk including elevation, proximity to flood sources, and structure characteristics — replacing the legacy FIRM (Flood Insurance Rate Map) zone-based pricing.

NFIP limitations create coverage gaps for higher-value properties and commercial risks: the $250,000 residential building limit is insufficient for any home with a replacement cost above that threshold; NFIP provides no business interruption coverage; NFIP contents coverage excludes items in basements; and NFIP does not cover additional living expenses. Private flood insurance from admitted and surplus lines carriers fills these gaps — higher limits (up to $15M+ on commercial), broader coverage, broader definition of flood, and competitive pricing in lower-risk zones.

Earth Movement Exclusion

The earth movement exclusion in ISO HO-3 goes beyond earthquakes. The full exclusion encompasses: earthquake, landslide, mudflow or mudslide, subsidence, sinkholes, erosion, and any movement of earth including rising, sinking, or shifting — whether caused by natural processes or human activity. Subsidence from groundwater depletion (common in arid western states), mining subsidence, construction vibration-induced soil movement, and karst sinkhole formation are all excluded under the standard earth movement exclusion.

Earthquake coverage: available as a standalone policy or endorsement in all states, with pricing determined by USGS seismic hazard zone classification. California, the Pacific Northwest, Alaska, the New Madrid Seismic Zone (Missouri, Tennessee, Arkansas, Illinois, Kentucky), and the Intermountain West carry the highest seismic hazard ratings. California residential earthquake insurance is primarily provided through the California Earthquake Authority (CEA), a publicly managed entity created in 1996 after the 1994 Northridge earthquake destabilized the private residential earthquake market. CEA policies typically carry a 10–25% deductible of the policy limit — a $500,000 policy with a 15% deductible requires the policyholder to pay $75,000 before coverage applies. Earthquake insurance is significantly underutilized relative to actual seismic risk in California and the Pacific Northwest.

Sinkhole coverage: Florida Statute §627.706 requires all admitted carriers selling residential property insurance in Florida to offer sinkhole coverage. Carriers must provide catastrophic ground cover collapse coverage (full structural collapse) as a base policy element; sinkhole loss coverage (damage from actual sinkhole activity without full collapse) is available as an endorsement. Tennessee, Texas, Missouri, and Pennsylvania have significant sinkhole activity but no mandatory coverage requirements.

Ordinance or Law Exclusion

The ordinance or law exclusion removes coverage for the increased cost of construction required by current building codes when rebuilding or repairing after a covered loss. The exclusion applies in three distinct scenarios: demolition of the undamaged portion of the structure required by code (a “50% rule” that requires full demolition if damage exceeds 50% of value); increased cost of rebuilding the damaged portion to current code; and loss in value to the undamaged portion resulting from enforcement of ordinances or laws.

Without the ordinance or law endorsement, a policyholder rebuilding a 1960s home after a covered fire receives only the cost to replicate the original construction specifications. The building department, however, requires current code compliance: updated electrical panels, AFCI breaker protection on all branch circuits (NEC 210.12(A)), GFCI protection at all required locations, current energy code insulation R-values (IECC 2021), and potentially ADA provisions for commercial structures. These code-mandated costs are not covered without the endorsement.

The ordinance or law endorsement is typically available in limits of 10–50% of the Coverage A limit. For properties with significant code gap exposure — homes built before 1970, commercial structures in jurisdictions with active code enforcement, historic buildings in preservation districts — the maximum available limit should be purchased. FEMA estimates that code upgrades represent 15–25% of residential reconstruction costs after major loss events in older housing stock markets.

Sewer Backup and Sump Pump Overflow Exclusion

ISO HO-3 excludes water damage that backs up through sewers or drains and water that overflows from a sump pump, sump pump well, or similar system. The exclusion applies regardless of cause — a municipal sewer system overwhelmed by heavy rain, root infiltration of the building’s lateral sewer line, a sump pump that fails during a high-water-table event, or a drain valve that malfunctions all produce the same coverage result: excluded.

This exclusion is particularly consequential for properties with finished basements and homes in areas with combined sewer systems (where storm water and sanitary sewer share infrastructure). A sewer backup event in a finished basement — wet bar, home theater, guest bedroom, bathroom — can cause $30,000–$80,000 in damage. Sewer backup coverage endorsements are available from most carriers at $50–$150 annually for limits of $5,000–$25,000. These limits are frequently inadequate for finished basements; higher limits should be sought, and the endorsement should be purchased regardless of perceived backup risk.

Service Line Coverage Gap

Standard homeowner’s policies do not cover damage to underground service lines — the water supply line from the street meter to the foundation, the sewer lateral from the foundation to the municipal connection, the underground gas line, and underground electrical conduit. The property owner is typically responsible for the service lines from the property line to the structure (and in some municipalities, from the street tap). Failure of these lines is common — root infiltration, soil movement, material failure in aging clay or cast-iron pipe, and corrosion — and repair costs range from $3,000 to $15,000+ depending on line type, depth, and access conditions.

Service line coverage endorsements are available from most homeowner’s carriers for $25–$60 annually, covering underground service line repair or replacement up to $10,000–$25,000 per event. This is one of the highest-value endorsements available on a cost-per-dollar-of-coverage basis and is among the most frequently recommended additions to a standard HO-3 policy.

Mold Limitation and Exclusion

Following significant mold claim losses in the late 1990s (Texas was particularly affected, with mold claims reaching $4.2 billion in 2001–2002), most carriers added mold exclusions or sublimits to residential policies by 2003. The standard mold limitation excludes mold that results from a long-term or repetitive moisture condition — a chronic roof leak, persistent condensation, inadequate ventilation — but typically preserves coverage for mold that results directly from a sudden and accidental covered peril, such as a pipe burst that creates conditions for mold growth.

The covered-peril mold coverage is frequently disputed in claims: carriers argue the mold resulted from pre-existing moisture conditions; policyholders argue it resulted from the covered water event. Resolution turns on the timeline — mold visible within 48–72 hours of a covered water event is generally accepted as loss-related; mold discovered weeks later requires documentation establishing causation. ANSI/IICRC S520 Standard for Professional Mold Remediation provides the technical framework for causation analysis in contested mold claims.

Intentional Loss and Fraud Exclusions

All property policies exclude intentional loss — damage intentionally caused by the insured. Less commonly understood is the innocent co-insured doctrine: when one insured intentionally causes a loss, most carriers take the position that the exclusion voids coverage for all named insureds, including the innocent spouse or co-owner who had no knowledge of or participation in the act. A minority of states have enacted innocent co-insured statutes providing coverage to the innocent party; in the majority of states, the exclusion is enforced against all named insureds jointly, potentially leaving the innocent co-insured without coverage for the loss caused by their co-insured’s intentional act.

Frequently Asked Questions

Property Insurance: The Complete Professional Guide (2026)

Property insurance is the primary financial protection mechanism against the physical loss of real and personal property — one of the largest categories of asset value on most balance sheets, residential and commercial. The decision architecture of property insurance — what form to buy, at what limits, with which valuation method, and with which endorsements to fill coverage gaps — directly determines the financial outcome of claims that may occur years or decades after the policy is written. A policy designed correctly at inception pays in full when loss occurs. A policy designed incorrectly — wrong limits, ACV instead of RCV, gaps in exclusion coverage — produces financial shortfalls at precisely the moment the policyholder has the least capacity to absorb them.

This guide provides the professional framework for property insurance analysis across the three dimensions that determine claim outcomes: policy structure, loss valuation methodology, and exclusion gap management.

Property Insurance Policy Structure

The ISO HO-3 Special Form organizes residential property coverage into four parts: Coverage A (dwelling), Coverage B (other structures), Coverage C (personal property), and Coverage D (loss of use/ALE). The ISO CP commercial property policy organizes commercial coverage into Coverage A (buildings) and Coverage B (business personal property), with business income and extra expense addressed in separate coverage forms. Understanding the default limits, valuation methods, and sublimits within each coverage part is the foundation of competent policy review.

Coverage A is written on open-perils basis under HO-3 — all direct physical loss is covered unless excluded. Coverage C is written on named-perils basis — only losses from the 16 listed perils are covered. This asymmetry means damage to the dwelling from a covered flood (if flood coverage is added) may be covered under Coverage A while the personal property damaged in the same event is covered under Coverage C only if flood is a listed peril in the named-perils schedule. The complete breakdown of each coverage part, its default limits, and the critical design decisions within each are covered in Property Insurance Policy Structure: Coverage A, B, C, D and How Each Applies.

Loss Valuation: ACV vs. RCV vs. Agreed Value

The valuation method written into the policy determines — sometimes by tens of thousands of dollars — what a policyholder receives when a covered loss occurs. Actual cash value (ACV) pays replacement cost minus depreciation; replacement cost value (RCV) pays without depreciation deduction but requires documented proof of completed repairs before releasing the depreciation holdback; agreed value pre-establishes the loss payment through professional appraisal, eliminating both depreciation and coinsurance disputes.

The practical financial gap between ACV and RCV is largest for properties with older components — roofing, flooring, HVAC equipment, kitchen appliances — where depreciation tables reduce claim payments by 30–60% on items approaching the end of their useful life. The premium difference between ACV and RCV is typically 10–25% of the dwelling premium — a modest cost relative to the claim payment differential in a significant loss. The complete valuation methodology analysis, including recoverable depreciation mechanics, functional replacement cost, and the broad evidence rule in ACV states, is covered in Property Insurance Claims Valuation: ACV, RCV, and Agreed Value Methods.

Exclusion Gap Management

The ISO HO-3 open-perils form’s exclusion list defines the boundaries of coverage and identifies where additional protection is required. The highest-frequency, highest-severity uninsured exposures from standard policy exclusions are flood (the largest source of uninsured property loss in the U.S.), earth movement and earthquake, ordinance or law (code upgrade costs), sewer backup and sump pump overflow, underground service lines, and mold from non-covered causes. Each requires either an endorsement to the base policy or a separate policy to fill the gap.

The consequence of leaving exclusion gaps unaddressed is not merely losing a claim — it is losing a claim during the most financially stressful event the policyholder has experienced. The endorsement costs to fill the most significant gaps are modest: sewer backup endorsement ($50–$150/year), service line endorsement ($25–$60/year), ordinance or law endorsement (variable by limit and property type). The cost-per-dollar-of-coverage ratio on these endorsements is among the highest available in personal lines insurance. The complete exclusion analysis with gap-filling mechanisms for each is covered in Property Insurance Exclusions: What Standard Policies Don’t Cover and How to Fill the Gaps.

Commercial Property Insurance Distinctions

Commercial property insurance shares the fundamental structure of residential coverage but introduces additional complexity: business income and extra expense coverage (BI/EE) that replaces lost revenue during the period of restoration after a covered loss; the co-insurance clause (80%, 90%, or 100%) that must be met to avoid a coinsurance penalty on partial losses; ordinance or law exposure that is more severe for commercial structures with older electrical, plumbing, and mechanical systems; and the need to separately insure tenant improvements and betterments (TIB) — improvements made by a tenant to leased space that become real property under the lease and are not covered by the building owner’s policy.

For risk management professionals and commercial property owners, the intersection of property insurance and restoration operations — how carriers price claims, how reconstruction estimates are built and disputed, and how claim management decisions affect total loss cost — is covered in the RestorationIntel series at Insurance Claims for Property Restoration: The Complete Professional Guide.

Property Insurance Series Articles

• Property Insurance Policy Structure: Coverage A, B, C, D and How Each Applies — ISO HO-3 form architecture, Coverage A dwelling limits and coinsurance, Coverage B other structures, Coverage C personal property valuation and sublimits, Coverage D loss of use mechanics and documentation
• Property Insurance Claims Valuation: ACV, RCV, and Agreed Value Methods — depreciation methodology, recoverable depreciation mechanics, extended and guaranteed replacement cost endorsements, agreed value, functional replacement cost, and depreciation dispute resolution
• Property Insurance Exclusions: What Standard Policies Don’t Cover and How to Fill the Gaps — flood/NFIP/private flood, earthquake/CEA, ordinance or law, sewer backup, service line, mold limitations, and earth movement coverage

Frequently Asked Questions

Property Insurance Claims Valuation: ACV, RCV, and Agreed Value Methods

Loss valuation — the methodology by which a covered property loss is translated into a dollar payment — is the most consequential variable in property insurance claim outcomes after coverage determination. Two policyholders with identical losses and identical deductibles can receive claim payments that differ by 30–50% depending solely on whether their policy values losses at actual cash value (ACV) or replacement cost value (RCV). Understanding the three primary valuation methods — ACV, RCV, and agreed value — and the endorsements that modify them is essential for both policy design and claim management.

For the broader policy structure that determines which coverage parts are subject to which valuation method, see Property Insurance Policy Structure: Coverage A, B, C, D and How Each Applies. For coverage gaps where valuation method becomes moot because coverage does not apply, see Property Insurance Exclusions: What Standard Policies Don’t Cover.

Actual Cash Value (ACV)

ACV is the baseline valuation method in property insurance — the default when no RCV endorsement is present. The majority of courts define ACV as replacement cost minus depreciation: the cost to replace the damaged property with new property of like kind and quality at current prices, reduced by a depreciation factor that reflects the damaged property’s age, physical condition, and useful life remaining.

Definition — Actual Cash Value (ACV): The fair market value of damaged property immediately before loss, typically calculated as replacement cost minus physical depreciation. ACV is the standard loss valuation method in property insurance absent an RCV endorsement. A minority of states apply the broad evidence rule, which requires consideration of all relevant indicia of value.

Depreciation under ACV is calculated using the property’s expected useful life and current age. Carriers use internally maintained depreciation schedules or reference published schedules from Xactimate (Verisk Analytics), Marshall & Swift, or similar platforms. Common residential component useful lives and depreciation schedules used in claims:

• Asphalt shingle roofing: 20–25 year useful life; a 10-year-old roof on a 20-year schedule is depreciated 50%
• HVAC equipment (central): 15–20 year useful life
• Hot water heater (tank): 12–15 year useful life
• Carpet: 7–11 year useful life
• Hardwood flooring: 25–100 year useful life (highly variable by wear and species)
• Drywall: 50+ year useful life (very low depreciation rate)
• Exterior paint: 7–10 year useful life
• Kitchen appliances: 10–15 year useful life

The practical impact of ACV depreciation is most severe on older properties with recently damaged roofing, flooring, and mechanical systems. A $30,000 roof replacement on a 15-year-old roof with a 20-year useful life receives 75% of new cost = $22,500 under RCV, versus $7,500 under ACV (75% depreciated, leaving 25% of new cost). The policyholder’s out-of-pocket exposure for the same loss differs by $15,000 based solely on the valuation endorsement.

The broad evidence rule — applied in California, Michigan, and a handful of other states — requires ACV to reflect market value evidence in addition to replacement cost minus depreciation. Under the broad evidence rule, a property with significant functional obsolescence (an industrial building in a declining market) may be valued below replacement cost minus depreciation; a property with significant scarcity value (a historic Victorian in a high-demand neighborhood) may be valued above. The rule cuts both ways for policyholders depending on market conditions.

Replacement Cost Value (RCV)

RCV endorsements remove the depreciation deduction from covered property losses, paying the full cost of replacing the damaged property with new property of like kind and quality. RCV is available as an endorsement to standard HO-3 and commercial property policies and, on most residential policies, costs 10–25% more in premium than ACV coverage.

The two-payment structure of RCV claims is widely misunderstood. Carriers do not pay full RCV at claim approval — they pay ACV first, then release the depreciation holdback (called recoverable depreciation) upon documented proof that the repair or replacement has actually been performed. This structure is designed to prevent insureds from pocketing the depreciation without performing the repairs (which would result in a windfall payment above the insured’s actual economic loss). The recoverable depreciation amount equals the difference between the RCV estimate and the ACV payment.

Recoverable depreciation must be claimed within the policy’s stated time limit — most policies set this at 180 days to 2 years from the date of loss. The documentation required to release recoverable depreciation: paid contractor invoices demonstrating the scope of work performed matches the covered scope, photographs of completed work, and in jurisdictions requiring it, a certificate of occupancy for structural reconstruction work. Policyholders who miss the claim deadline forfeit the recoverable depreciation regardless of whether repairs were completed.

Extended replacement cost endorsements add 20–50% above the Coverage A limit specifically for rebuilding cost increases: construction price escalation between the policy inception date and the loss date, post-catastrophe labor and material price spikes, and code upgrade costs that exceed the ordinance or law endorsement sublimit. Guaranteed replacement cost (GRC) endorsements remove the Coverage A limit ceiling entirely for dwelling reconstruction, committing the carrier to pay whatever is necessary to rebuild the dwelling to its pre-loss condition, subject to maintaining Coverage A at 100% of current replacement cost estimates.

Agreed Value

Agreed value is a pre-loss contractual agreement between the carrier and policyholder establishing the loss payment for total loss without application of depreciation or coinsurance. It is used primarily for unique, difficult-to-appraise, or non-standard properties where post-loss valuation disputes would be inevitable and costly.

Applications: fine art and collectibles (where replacement cost is meaningless — a specific painting cannot be replaced); antique and vintage personal property (where depreciation under standard ACV understates value and RCV overstates it); historic structures where both market value and replacement cost are difficult to determine; specialized commercial equipment with no ready used market; and luxury custom residences where the cost to rebuild includes significant custom design and craft elements.

The agreed value endorsement requires a professional appraisal at inception. For fine art, a qualified fine art appraiser producing a written appraisal per Uniform Standards of Professional Appraisal Practice (USPAP) is standard. For real property, a licensed real property appraiser or a certified contractor’s replacement cost estimate. The agreed value is the settlement amount for total loss; partial losses may still be subject to ACV or RCV depending on the policy language, and the agreed value endorsement does not eliminate the requirement to actually suffer the covered loss.

Functional Replacement Cost

Functional replacement cost (FRC) is used primarily in commercial property insurance for older buildings with construction styles, materials, or features that would be prohibitively expensive to replicate under current building practices. FRC pays to replace the building’s function — the same square footage, same occupancy classification, same use — using modern construction methods and materials, rather than replicating the original construction.

FRC is appropriate for certain insureds (a family that owns a functionally sound 1940s warehouse and has no attachment to its original character) and inappropriate for others (a historic preservation organization insuring a building for its architectural and historical significance). The valuation method must match the insured’s actual reconstruction intent and financial exposure. Specifying FRC for a building that would require historic restoration after a loss is a coverage design error that produces a significant claim shortfall.

Depreciation Dispute Resolution

Depreciation calculations applied by carriers are frequently challenged by policyholders and public adjusters. Common dispute points: depreciation applied to labor (some states, including Texas and Florida, prohibit carriers from depreciating the labor component of a repair estimate — only materials may be depreciated); depreciation applied to code upgrades (code compliance costs are not subject to depreciation because they represent new work, not replacement of depreciated property); excessive depreciation percentages applied to items with longer actual useful lives than carrier schedules reflect; and depreciation applied to items that were recently replaced (a new roof that is 2 years old on a 25-year schedule should not be depreciated at the same rate as a 20-year-old roof).

Depreciation disputes are resolved through the policy’s appraisal mechanism or through state insurance department complaint procedures. In states where labor depreciation is prohibited by statute or regulation (Florida DFS, Texas TDI), the carrier’s obligation to not depreciate labor is directly enforceable and is not subject to the policy’s appraisal clause — it is a coverage issue, not a value dispute.

Frequently Asked Questions