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Storm shelters · Before you buy
Storm shelter code and certification
Look for testing to recognized tornado shelter standards, not a general claim of strength. Ask for the documentation rather than the brochure, confirm local permit rules before installation, and register the shelter once it is in.
Storm shelters are sold on strength, but the claim that matters is narrower: has this design been tested and documented to a recognized standard, and has it been installed the way that testing assumed? The rest of this page is how to check.
1What “certified” should mean
In the US, the recognized references for tornado shelters are the ICC 500 storm shelter standard and FEMA’s safe room guidance, FEMA P-320 for homes. A manufacturer claiming compliance should be able to show you the paperwork.
- Ask which standardGet the name of the standard the shelter was designed and tested to, in writing.
- Ask for test documentationLook for test reports covering the shelter walls and the door assembly, not just a general claim of strength.
- Check the door and hardwareThe door, hinges and latches are usually the weakest point. They should be covered by the same testing.
- Check the anchoringThe documentation should say how the shelter must be anchored. Installation has to match it.
- Keep the paperworkYou will want it for the permit, the registry and resale.
“Tornado-proof”, “rated for an EF5” and similar phrases mean nothing without the test documentation behind them. Ask for the documents, not the marketing.
2Permits and inspection
Permitting and inspection requirements are set locally and vary widely. Some jurisdictions require a permit for any shelter; others only for in-ground units or slab anchoring. Confirm what applies in your jurisdiction before installation, not after. Ask the installer who pulls the permit and who books the inspection.
3Register it
Many municipalities in tornado-prone areas keep a shelter registry so responders know where to look after a storm. It is usually free, and a great many installed shelters are never added to it. Check whether yours runs one before you assume it does not.
4Occupancy and ventilation
How long you can stay inside is limited by ventilation, not structure. Confirm the rating for the number of people who will actually use the shelter, not the maximum on the label. If you expect neighbors or extended family, size it and ventilate it for them.
| Question to ask | Why |
|---|---|
| How many people is it rated for? | The label maximum assumes a short stay |
| How is it ventilated? | Air, not walls, sets the time limit |
| Which way does the door open? | Debris can pile against it after a storm |
| How is it anchored? | An existing slab may not match the tested anchoring |
5What drives the cost
The price moves with in-garage versus in-ground, size and occupancy, the door assembly, how it is anchored, site access for excavation or delivery, and local permit fees. Retrofitting into a finished basement or interior room is a different job from a garage unit.
Talk to a local installer who will show you the test documentation and handle the permit.
877-360-46576Questions
Do I need a permit for a storm shelter?
It depends on where you live. Rules are set locally and vary widely, so check with your building department before installation.
Is registering my shelter required?
Usually not required, but it is often free and helps responders find you after a storm. Check whether your city or county keeps a registry.
How long can we stay in the shelter?
That depends on ventilation and the number of people inside. Ask for the rating for your actual headcount.
Written by Jaylan Jones. I Like To Exterior Services earns a referral fee when a call connects to a contractor. See our business-model disclosure.
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