Other Structures Coverage: Fences, Garages, and Outbuildings

Other structures coverage is a standard component of most homeowners insurance policies, protecting buildings and fixed structures on a property that are separate from the main dwelling. This page explains how the coverage is defined, how the limit is calculated, which scenarios trigger or deny a claim, and how policyholders can assess whether the default coverage amount is adequate. Understanding this coverage is particularly relevant for properties with detached garages, fences, sheds, barns, or guesthouses, where the replacement cost of secondary structures can be substantial.

Definition and scope

Other structures coverage appears in Section I of standard homeowners policy forms as Coverage B. The Insurance Services Office (ISO), whose standardized policy language underlies the majority of personal lines homeowners forms in the United States, defines other structures as those "separated from the dwelling by clear space" or connected only by a fence, utility line, or similar connection.

Structures that typically fall within Coverage B include:

Detached garages and carports
Fences, walls, and gates
Sheds, storage buildings, and tool houses
Barns, stables, and agricultural outbuildings (on residential properties)
Gazebos, pergolas, and pavilions
Driveways and walkways (in some form editions)
Swimming pool enclosures and pump houses
Guesthouses not rented to others

The coverage does not extend to structures used primarily for business purposes, nor to structures rented or held for rental to any party other than a tenant of the main dwelling. This exclusion is a defined boundary in ISO HO-3 form language. A detached workshop used for commercial production or a converted garage rented as a separate unit falls outside Coverage B and requires separate business or landlord coverage.

For a full comparison of how Coverage B fits within the broader policy structure, see Homeowners Insurance Coverage Types and the detailed breakdown at HO-3 Policy Explained.

How it works

Coverage B limits are set as a percentage of the Coverage A (dwelling) limit, not as a separately negotiated dollar amount. Under the ISO HO-3 form, the standard default is rates that vary by region of the Coverage A limit (ISO HO-3, Section I – Property Coverages, Coverage B). If a dwelling is insured for amounts that vary by jurisdiction Coverage B automatically provides amounts that vary by jurisdiction for other structures.

This percentage-based mechanism means Coverage B adjusts proportionally when the dwelling limit is increased, but it also means the default may be inadequate for properties with high-value secondary structures. A property with a amounts that vary by jurisdiction detached garage and a custom barn on a amounts that vary by jurisdiction insured dwelling would have only amounts that vary by jurisdiction in default Coverage B — a gap of at least amounts that vary by jurisdiction before considering the barn.

Valuation method matters equally. Coverage B claims are subject to the same Replacement Cost vs. Actual Cash Value framework that governs Coverage A. Many standard policies pay Coverage B claims on an actual cash value (ACV) basis unless the policy is endorsed to replacement cost. A 20-year-old fence replaced at ACV could yield a payout significantly below the cost of materials and labor at current prices.

Perils covered under Coverage B mirror the Coverage A perils on the same policy form. On an HO-3 form, Coverage A is open-perils (all-risk) while Coverage B is also open-perils — but specific exclusions apply, including earth movement, flood, ordinance or law, intentional acts, and neglect. On more restrictive forms, Coverage B may be named-perils only. See Named Perils vs. Open Perils for the definitional distinction.

Common scenarios

Fence damage from windstorm: Wind and hail are among the most frequent causes of fence and outbuilding claims. Coverage B pays for fence repair or replacement after a covered windstorm, subject to the deductible and applicable valuation method. For properties in high-exposure zones, the Wind and Hail Coverage page addresses deductible structures that often apply separately.

Detached garage fire: A fire originating in a detached garage is covered under Coverage B for the structure itself. Contents inside the garage — tools, lawn equipment, vehicles — are addressed under Coverage C (Personal Property Coverage) for movable items, and under the auto policy for vehicles. The split across coverage types is a common source of confusion during claims.

Shed destroyed by fallen tree: If a covered peril (wind) causes a tree to fall onto a storage shed, Coverage B responds to the shed structure. Debris removal costs may be subject to a sub-limit within the policy, typically amounts that vary by jurisdiction to amounts that vary by jurisdiction for tree removal when the tree falls on a covered structure (ISO HO-3, Additional Coverages, §1.d).

Guesthouse used for short-term rental: If a guesthouse is listed on a short-term rental platform, standard Coverage B exclusions for "structures rented or held for rental" may void coverage for that structure. The Short-Term Rental Homeowners Insurance page addresses the endorsement and policy alternatives applicable to this scenario.

Ordinance or law upgrades: Following a covered loss, local building codes may require that a rebuilt fence or outbuilding meet current setback, materials, or height standards. Standard Coverage B does not pay the cost of code upgrades. That gap is addressed by Ordinance or Law Coverage, available as an endorsement.

Decision boundaries

The central decision in Coverage B adequacy is whether the default rates that vary by region of Coverage A is sufficient for the specific property's secondary structures. Four factors determine that calculation:

Inventory and replacement cost: A property owner should document every structure not attached to the main dwelling and obtain a replacement cost estimate. The Home Inventory for Insurance Claims methodology applies equally to structures.
Valuation basis: ACV vs. replacement cost settlement produces materially different outcomes on older structures. Fences, in particular, depreciate rapidly under ACV schedules. Confirming the valuation basis in the policy declarations is a prerequisite to assessing adequacy.
Business use exclusion boundary: Any structure with dual-use characteristics — a workshop where occasional sales occur, a barn used for boarding animals for compensation — must be evaluated against the business-use exclusion. The boundary is not always clear in form language, and state insurance department bulletins sometimes narrow or expand the exclusion's scope.
Endorsement options: Insurers offer Coverage B limit increases, typically in increments that allow the limit to be raised to rates that vary by region or higher of Coverage A. Where a property has a substantial detached garage or barn, an increased Coverage B endorsement is the primary corrective mechanism. Some insurers also offer standalone outbuilding floaters for high-value agricultural structures.

A secondary decision boundary concerns which policy form is in use. The HO-5 form (HO-5 Policy Explained) provides open-perils coverage on both Coverage A and Coverage B with broader loss settlement terms, whereas HO-3 default Coverage B, while technically open-perils, may carry more restrictive loss conditions at the insurer's discretion. Comparing form language rather than marketing descriptions is the accurate method of distinguishing coverage quality.

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