Underground storm shelters for your home
An underground storm shelter puts a steel, concrete or fiberglass room below ground, in the yard or under the garage floor, where the soil around it takes the force of the wind and flying debris. Most go in within a day once the permit is sorted.
Tell us about your home and we find an installer who covers your area, then name them to you before anyone gets in touch.
A free matching service, not a storm shelter installer. We find one who covers your area and tell you who they are before anything is shared. How it works
Underground, garage or above ground?
Three common shelters drawn to the same scale, then compared on the things that decide it.
| Question | In the yard | Under the garage floor | Storm cellar | Above-ground safe room |
|---|---|---|---|---|
| Where it goes | A unit buried outside, roof at ground level | A steel box set into a cut in the slab | Precast concrete, steel or fiberglass, set in a day | Steel or concrete, bolted to a slab |
| Getting in | Sloped door or hatch and steps down | Sliding lid you can park over, steep steps | Door and full stairs | A normal door, no stairs |
| Best when | You have room, diggable ground and no flood risk | You want it seconds from the house door without losing a parking bay | Farms and big yards, or replacing an old cellar | Rock, flood zones and anyone who cannot manage steps |
| Watch out for | Rock, standing water and the walk to it in the rain | Steep steps and high groundwater | Drainage and venting | Needs a sound slab and room in the garage or yard |
| Typical price | $4,000 to $20,000+ | $6,000 to $15,000 | $4,000 to $15,000 | $3,000 to $12,000+ |
What an underground storm shelter costs
Typical installed prices from three published cost guides. Your price depends on the number of people, the material, your soil and access for the digger.
| Shelter | Typical installed price |
|---|---|
| Underground shelter in the yard Steel or concrete | $4,000 to $20,000+ |
| Under the garage floor Steel box, sliding lid | $6,000 to $15,000 |
| Fiberglass unit Underground only | $3,000 to $10,000 |
| Shelter for 6 people Any type, installed | $3,800 to $7,800 |
| Shelter for 12 people Any type, installed | $5,500 to $15,000 |
| Above-ground safe room For comparison | $3,000 to $12,000+ |
Ranges from Angi (updated September 9, 2026), HomeGuide and NerdWallet, read October 26, 2026. A guide, not a quote.
Four things to settle before you get quotes
Who needs to fit
FEMA P-320 asks for at least 3 square feet of floor per person in a home tornado safe room. A family of four needs about 12 square feet; a residential shelter under ICC 500 holds up to 16 people.
Who needs to get in
Stairs and floor hatches are hard for wheelchair users, people on crutches and some older relatives. If that is your household, an above-ground or interior safe room may suit better.
What is under the lawn
Rock, clay and high groundwater change the method and the price. Water standing after rain is a warning sign.
How close it is
FEMA says a detached shelter should be within 150 feet of the home's nearest door, so everyone can reach it after a warning.
Standards, permits and registering your shelter
- The standards to ask about
- ICC 500, the national storm shelter standard written by the International Code Council with the National Storm Shelter Association, and FEMA P-361, FEMA's safe room criteria. FEMA P-320 is the homeowner guide. Ask whether the design meets them and whether the unit is listed and labeled to ICC 500.
- "FEMA approved" means nothing
- FEMA says it does not endorse, approve or certify any product or contractor, and firms may not claim their products are FEMA approved.
- Permits
- Most cities and counties want a building permit for a new shelter or slab cut. The installer often applies.
- Call 811 before digging
- It is free and gets public utility lines marked. call811.com
- Register it
- FEMA recommends giving the shelter's location, ideally the GPS position of the entrance, to your local fire department and emergency management office, so responders know to check it after a storm.
Rebates and tax credits
Two states publish programs. Funding varies and may be closed, and installing before approval can rule you out.
Oklahoma
SoonerSafe Safe Room Rebate Program
Up to $3,000 and no more than 75% of the cost of a new safe room at an owner-occupied single-family primary residence. Registrants are chosen by random drawing (some years give priority to disaster-declared counties), and a safe room installed or started before selection is not eligible.
Alabama
Alabama Storm Shelter Tax Credit
An income tax credit of the lesser of $3,000 or 50% of the cost of a qualifying shelter at your primary residence, through the 2028 tax year, with a $2,000,000 statewide cap each year. Apply to the Alabama Emergency Management Agency in the same calendar year the shelter is installed.
How an underground shelter is installed
Site check
The installer looks at the spot, the soil, drainage and access for a truck or excavator, often from photos first, then in person.
Quote, permit and 811
You get a written price and spec; the permit is applied for and buried lines are marked.
Dig or cut
An excavator digs the hole in the yard, or a saw cuts the garage slab, usually in a few hours.
Set and lock down
The unit is lowered onto a drained base and locked in with concrete or anchors so it cannot float in wet ground, then backfilled and graded.
Inspect and register
The inspector signs it off where needed, and you register the location with local emergency services.
Questions people ask
How much does an underground storm shelter cost?
Published guides put most installed underground shelters at $4,000 to $20,000 or more. Angi puts in-ground shelters as high as $30,000 for large units. Size, material, rock and water in the ground, and access for the digger make the difference. Our cost calculator gives a range for your home.
Is underground safer than above ground?
Both can protect you when built to the same standard. Below ground, the soil shields the shelter from debris; above ground, the walls and door must pass debris impact tests. Ask whether the design meets ICC 500 and FEMA P-361 rather than choosing on location alone.
How deep is an underground storm shelter?
Most modern units sit with the roof at or just below ground, with the opening raised a few inches above grade to keep rain out. Published units run about 4.5 to 5.5 feet tall, so the hole is roughly that deep plus a gravel base.
Do underground storm shelters flood?
They can if the site is poor or the shelter is not sealed and anchored. FEMA advises against below-ground shelters in flood zones. A drained base, sealed hatch, ground sloping away and a unit that cannot float keep most shelters dry.
How many people fit in a storm shelter?
Allow at least 3 square feet of floor per person, the figure in FEMA P-320 for home tornado safe rooms. A 6 by 8 foot shelter has 48 square feet, which is space for up to 16 on that measure, though benches and comfort mean most families choose fewer.
Do I need a permit for an underground storm shelter?
Usually. Most cities and counties require a building permit for a new shelter or a cut in a slab. Ask your local building department, or ask the installer to apply.
Is there a rebate or grant for storm shelters?
Some states run programs. Oklahoma's SoonerSafe offers up to $3,000 (no more than 75% of the cost) by random selection, and Alabama offers an income tax credit of up to $3,000 or 50% of the cost. Funding varies and may be closed, and installing before approval can rule you out.
Do you install shelters?
No. We are a free matching service, not an installer. We find one who covers your area and name them to you first; they quote and do the work, and your contract is with them.
Get a free shelter quote
Three short steps: where you are, what you need, and how to reach you. It takes about two minutes.
This is a free matching service, not a storm shelter installer. We find one who covers your area and name them to you first. Nobody contacts you until you say yes.
Thanks, your enquiry is in.
- Within one working day we will email or call to tell you which storm shelter installer covers your area.
- Your details reach that firm only if you say yes.
- They look at the site and give you a fixed price. No marketing from us, ever.
We are a free matching service, not a storm shelter installer. Installers we introduce may pay us a fee; it never changes your price, and we do not guarantee any shelter or its performance.