A detached garage is one of the more valuable structures on a residential property, and most homeowners assume their insurance covers it the same way it covers the main house. That assumption is mostly correct, but with one significant catch: the coverage limit on a detached garage is much lower than what applies to your home, and that gap can matter enormously after a total loss.
Understanding exactly how your policy treats a detached garage — what’s covered, what isn’t, and where the limits sit — takes about 10 minutes and can save you a painful surprise at claim time. Here’s how it works.
Coverage B: Other Structures
Standard homeowners policies are divided into several coverage sections. The main dwelling is Coverage A. Your detached garage falls under Coverage B, which is called “other structures.” This section covers any structure on your property that is separated from the main house — detached garages, sheds, fences, detached carports, guest houses, gazebos, and similar structures.
The default limit for Coverage B is typically 10% of your Coverage A limit. If your home is insured for $400,000, your Coverage B limit is $40,000. For a small shed, that’s more than enough. For a large detached garage with a finished interior, custom cabinetry, an HVAC system, and an upgraded electrical panel, $40,000 may not come close to covering a rebuild. Construction costs in most markets have risen significantly over the past several years, and a substantial detached garage can cost $60,000 to $120,000 or more to rebuild from scratch, depending on size and finish level.
The Coverage B limit applies across all other structures on your property. If you have a detached garage, a storage shed, and a fence that all get damaged in the same event, they all draw from that same pool. This is an important detail if you have multiple structures on your lot.
What Coverage B Actually Pays For
Coverage B pays for physical damage to your detached garage caused by a covered peril. The specific list of covered perils depends on whether your policy is a named-perils form or an open-perils form. Most standard homeowners policies (HO-3 is the most common) cover the dwelling and other structures on an open-perils basis, which means damage is covered unless specifically excluded. Named perils that are commonly covered include fire, lightning, windstorm, hail, explosion, vandalism, theft, vehicle impact, and falling objects.
A few of these are worth highlighting for garages specifically. Vehicle impact is covered — if someone drives into your detached garage (including you), Coverage B pays to repair or rebuild the structure. Windstorm and hail are covered, which is the most common cause of significant damage to detached structures. Fire is covered. If a fire starts in your garage — from a welding accident, a faulty appliance, or an electrical issue — the structure itself is covered under Coverage B, and the house is covered under Coverage A if the fire spreads.
Coverage B pays on the same valuation basis as your Coverage A limit. If your dwelling is insured at replacement cost, your garage is typically also covered at replacement cost. If your policy uses actual cash value for other structures, depreciation will be factored into any payout. Check your policy declarations page and the Coverage B section to confirm which valuation method applies to other structures.
What Coverage B Does Not Cover
The exclusions that apply to your main dwelling also apply to your detached garage. The two biggest are flood and earthquake. If a flood destroys your detached garage, your homeowners policy pays nothing — you need separate flood insurance through the National Flood Insurance Program or a private insurer. If an earthquake damages or collapses your garage, standard homeowners coverage doesn’t apply either. Earthquake coverage requires a separate endorsement or a standalone policy.
Gradual deterioration and maintenance failures are excluded. If your garage roof slowly deteriorates over years of deferred maintenance and eventually fails, that’s not a covered claim. Same with wood rot from persistent moisture, pest damage from termites, foundation settling, and similar issues. Insurance covers sudden, accidental losses — not the slow decline of a structure that wasn’t maintained.
Intentional damage is excluded. Coverage B also won’t respond if the structure is used primarily for business purposes — more on that below, because it matters for a lot of homeowners who run operations out of their garage.
How to Increase Your Coverage B Limit
If your detached garage is worth more than 10% of your home’s insured value, you should request a Coverage B increase. This is a straightforward adjustment that most carriers will accommodate. You’ll pay additional premium, but it’s typically modest compared to the cost of the structure itself.
Before calling your agent, get a rough estimate of what it would cost to rebuild your garage from scratch. Consider the square footage, the foundation type (slab, crawlspace), the materials (wood frame, steel, brick), and any upgrades — finished drywall, electrical capacity, plumbing, HVAC, insulation, custom doors, cabinets, or a loft. A contractor or local cost estimator can give you a ballpark number. You want Coverage B to be at least as high as the full rebuild cost of all other structures on your property combined.
Some carriers offer a blanket increase to Coverage B as a percentage of Coverage A. Others allow you to schedule the detached garage separately with its own limit. Ask your agent which option is available and which provides better coverage for your situation. If your garage has been recently appraised or if you have receipts from significant improvements, share that documentation — it supports your case for a higher limit and may also be useful if you ever need to file a claim.
Personal Property Inside the Garage
Your homeowners policy also covers personal property, which is Coverage C. This applies to belongings anywhere on your property, including inside your detached garage. Tools, lawn equipment, sporting goods, a bicycle, camping gear — all of this falls under Coverage C, not Coverage B. Coverage B covers only the garage structure itself.
Coverage C has its own set of sublimits for specific categories of property. Tools are usually covered at full personal property limits, but expensive equipment can hit those limits quickly. Power tools, air compressors, pressure washers, generators, and similar items have real replacement value that adds up fast. If you have a significant amount of equipment stored in or used from your garage, inventory it and compare the replacement value against your Coverage C limit.
Some categories of property have per-item or per-category sublimits that are surprisingly low. Firearms are often capped at $2,500 for theft. Jewelry, silverware, and furs have standard sublimits as well. If you store anything in your garage that might fall into a sublimited category, check your policy and consider a scheduled personal property endorsement to cover those items at full value.
If your garage is broken into and tools are stolen, that’s a Coverage C theft claim, not a Coverage B claim. The deductible applies the same way it would for any covered loss. Some policies offer a zero-deductible option for certain types of claims, but most standard policies apply the same deductible across personal property losses.
Business Use in the Garage and the Business Exclusion
This is the area where a lot of homeowners run into problems they didn’t anticipate. If you regularly conduct business activities out of your detached garage — running a small repair shop, doing mechanic work for paying customers, operating a woodworking business, or storing business inventory — the business exclusion in your homeowners policy can become a serious issue.
Standard homeowners policies exclude coverage for structures used primarily for business purposes. If your detached garage is converted into a commercial workspace and used regularly for income-generating activities, Coverage B may not apply to that structure. The line between “I do woodworking as a hobby” and “I sell furniture from my garage” matters, and insurance companies can argue the distinction when a claim is filed. The same exclusion applies to business property — tools and equipment used primarily for business are typically excluded from Coverage C or have very low sublimits ($2,500 is a common cap for business property in a home policy).
If you use your garage for any business purpose, talk to your agent about the right solution. Options include a home-based business endorsement, an in-home business policy, or a separate commercial property policy for the equipment and potentially the structure. The cost is usually manageable, and it closes a gap that can otherwise result in a denied claim on thousands of dollars of business property or on the garage structure itself.
The business exclusion also has implications for liability. If a customer or vendor is injured while visiting your garage for business purposes, your homeowners liability coverage may not apply. This is another reason to address business use explicitly rather than assuming your standard policy covers it.
When You Actually File a Claim
The claims process for a detached garage is worth understanding before you need it, because a few decisions you make in the first 24 to 48 hours after a loss can affect how smoothly the claim proceeds and how much you ultimately receive.
After damage occurs, your first step is to prevent further loss if it’s safe to do so. Cover an opening in the roof with a tarp, board up a broken door, do what you reasonably can to protect the structure and its contents from additional damage. Keep your receipts for any emergency measures — those costs are typically reimbursable under your policy. Document everything before you start any cleanup or temporary repairs. Photograph the damage from multiple angles, including the interior and exterior of the structure, and photograph any belongings inside the garage that were damaged.
Report the claim promptly. Most policies require timely notification after a covered loss, and waiting too long can create complications even if the delay seems reasonable to you. Your insurer will assign an adjuster who will inspect the damage and prepare a repair or replacement estimate. For a large detached garage with significant damage, it’s worth getting your own independent contractor estimate to compare against the adjuster’s number. Adjusters use standardized cost databases that may or may not reflect actual labor and material costs in your local market at the time of the loss.
If your coverage is replacement cost, you’ll typically receive two payments: an initial payment based on actual cash value (replacement cost minus depreciation), and a supplemental payment once repairs are actually completed. You need to complete the repairs to collect the full replacement cost amount. If you take the initial payment and don’t rebuild, you generally won’t receive the depreciation holdback. This structure is standard but catches some homeowners off guard when they’re budgeting for a repair.
If you have a mortgage that extends to outbuildings on the property, your lender may be listed as a loss payee for Coverage B claims, meaning the claim check may be made out to both you and your lender. This is less common for detached garages than for the main dwelling, but it’s worth knowing in advance so you’re not surprised by a check that requires your mortgage servicer’s endorsement before you can cash it.
The Practical Checklist
Pull out your homeowners policy and find the declarations page. Look at the Coverage A limit — that’s your dwelling coverage. Calculate 10% of that number. That’s your default Coverage B limit. Now think honestly about whether that number would cover rebuilding every structure on your property that isn’t the main house.
If the math doesn’t work, call your agent and request a Coverage B increase. Get a rough rebuild estimate for your detached garage if you can. While you’re at it, do a quick walkthrough of what’s stored in your garage and estimate the replacement value of tools, equipment, and other belongings. Compare that against your Coverage C limit. If your policy covers other structures at actual cash value rather than replacement cost, ask what it would cost to upgrade to replacement cost valuation — the difference in payout after a major loss can be significant.
Finally, be honest about any business use. If you make money from activities in your garage, make sure your policy accounts for it. A standard homeowners policy is not designed for business operations, and the exclusions are real. Closing that gap is a straightforward conversation with your agent — don’t leave it unaddressed.