The HO-3 special form is the standard homeowners policy in the United States. When people say "home insurance," this is almost always what they mean, and it's what most insurers will quote you by default.

Who this is for: most owners of single-family homes. If you own the house you live in, the HO-3 is the baseline to compare everything else against.

What "open perils" actually means

An HO-3 covers your dwelling and other structures (like a detached garage or fence) on an "open perils" basis. Instead of listing the events it covers, the policy covers everything except the exclusions it names. That's the reverse of a named-perils policy, and it works in your favor twice:

  • Unusual causes of damage are covered unless specifically excluded.
  • In a dispute, the insurer generally has to show an exclusion applies, rather than you having to prove a listed peril caused the loss.

How your belongings are covered

Here's the wrinkle: on a standard HO-3, your personal property is covered on a named-perils basis, usually the same broad list used in an HO-2 (fire, theft, windstorm, water discharge from plumbing, and so on). So the house itself gets the wider open-perils treatment, while your stuff gets the defined list. If you want open perils on both, that's the HO-5 comprehensive form.

What else is in the package

Beyond the dwelling and contents, an HO-3 includes loss of use (extra living costs if a covered loss makes your home unlivable), personal liability, and medical payments to others. It's a full household package, not just structure coverage.

Common exclusions

Open perils doesn't mean everything. Standard exclusions include:

  • Flood, including storm surge. That takes separate flood insurance.
  • Earthquake and other earth movement, which needs its own earthquake coverage.
  • Wear and tear, neglect, and gradual deterioration
  • Pests like termites and rodents
  • Ordinance or law, war, nuclear hazard, and intentional damage

Sewer backup and ordinance-or-law upgrades are often available as endorsements if you want them.

Things worth checking on any HO-3 quote

Two details change how well the policy actually works: whether your dwelling limit reflects the real cost to rebuild, and whether contents are covered at replacement cost or actual cash value (many insurers let you upgrade to replacement cost for a modest amount). Wind or hail deductibles can also differ from your main deductible in some regions, so it pays to read that line.

The short version

The HO-3 pairs open-perils coverage on your home with named-perils coverage on your belongings, plus liability and loss of use. It's the industry default for good reason.

Because nearly every insurer offers one, the HO-3 is also the easiest policy to shop: same form, different prices, so comparing a few quotes tends to pay off quickly.