STORM SHELTERS & SAFE ROOMS · MIDDLE GEORGIA
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or call (678) 863-5620The short answer
A residential storm shelter or safe room should meet ICC 500, and FEMA recommends designing for 250 mph tornado winds anywhere. In-ground units must be anchored against groundwater uplift, graded so runoff flows away from the door, and kept out of floodways. In Middle Georgia, tornadoes cluster from March through May, so installs are best finished before spring.
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Who does the work
One crew, raw ground to a working system
Key facts
Each row links to the agency, code or publisher it comes from. Tap a source to check it yourself.
| Topic | What it says | Source |
|---|---|---|
| Design wind speed | FEMA recommends residential safe rooms be designed for 250 mph tornado winds regardless of location. | FEMA P-320, Taking Shelter from the Storm: Building or Installing a Safe Room for Your Home (Sixth Edition, December 2024), 2024 |
| Debris test | A 15-pound 2x4 board traveling horizontally at 100 mph, striking end-on. | Same source as above |
| Space per person (tornado) | At least 3 square feet of floor area per person; 7 square feet for a hurricane safe room. | Same source as above |
| Floodways | Storm shelters and safe rooms are not allowed in floodways under any circumstance. | Same source as above |
| In-ground anchoring | Anchored so rising groundwater cannot push the unit out of the ground; FEMA also recommends an interior sump pump. | Same source as above |
| Exterior shelter distance | ICC 500 limits a residential shelter's access opening to 150 feet of travel from the nearest house entrance. | Same source as above |
| Middle Georgia tornado climate | About 6 tornado days per year in the Peachtree City forecast area; most tornadoes occur March through May. | NWS Peachtree City — Severe Weather Climatology |
| Underground shelter cost | $4,300 to $17,000 (typical market range, Fixr, 2022). | Fixr — Cost to Build a Storm Shelter (updated August 18, 2022), 2022 |
Plain definitions
The whole story
Middle Georgia sees real tornadoes. The National Weather Service office in Peachtree City, which covers the lake counties, reports an average of 6 tornado days a year in its area, with F2 or stronger tornadoes involved in 37 percent of events on a county-by-county basis. Tornadoes have been reported in every month, but most arrive in March, April and May. FEMA P-320 itself cites the April 2011 outbreak that hit Alabama, Mississippi and Georgia among the events that shaped its current guidance.
The ground decides how an in-ground shelter behaves. Most lake-region lots sit on Piedmont clay; the Davidson series that dominates the Baldwin, Jones and Putnam survey has a subsoil that runs 40 to 75 percent clay, and soils like Helena are only moderately well drained. A shelter set in a clay hole is set in a basin that can fill with water after heavy rain. FEMA warns that in-ground safe rooms must be anchored so rising groundwater cannot float them out of the ground, recommends a sump pump inside, and asks that the surface be graded to shed water away from the entrance.
Lake lots add siting rules. On a Georgia Power lease lot at Lake Sinclair, all construction has to sit outside the project boundary and at least 75 feet from the shoreline, and the septic system and its repair area have to fit on the lot too. Add the state setbacks that keep drain fields 5 to 10 feet from buildings and 10 feet from water supply lines, and the open spot for a shelter on a lake lot is often smaller than it looks.
How the job runs
Within 150 feet of travel from a house entrance, out of any floodway or flood hazard area, clear of the septic tank, drain field and repair area, and with ground that can be graded away from the door.
The 2021 and 2024 International Residential Code require signed and sealed construction documents for residential storm shelters unless the unit is prefabricated and listed and labeled to ICC 500. Your county or city building department confirms what it needs.
The excavation is mechanized digging, so a locate request goes in first and marked lines are respected.
Georgia 811 — Georgia Utility Facility Protection Act (O.C.G.A. 25-9) summary
The hole is dug to the depth and footprint the manufacturer or engineer specifies, with a level, compacted base. Where clay or rock is wet, a drainage layer under and around the unit helps keep water from collecting.
The shelter is lowered in and anchored per its design so it resists buoyant uplift from groundwater, as FEMA requires for in-ground units.
Backfill goes in lifts. The finished surface slopes away from the entrance so stormwater cannot run into the door, within the slope limits the design allows where soil cover is part of the debris protection.
Bare soil around the install is seeded or mulched so the new slope does not wash into the shelter entrance or downhill toward the lake.
What it costs
Storm shelter, typical range
$3,900–$9,000
per shelter
National average about $5,800.
Typical market range — Fixr — Cost to Build a Storm Shelter (updated August 18, 2022), 2022
Underground storm shelter
$4,300–$17,000
per shelter
Typical market range — Fixr — Cost to Build a Storm Shelter (updated August 18, 2022), 2022
Above-ground storm shelter
$2,800–$15,500
per shelter
Typical market range — Fixr — Cost to Build a Storm Shelter (updated August 18, 2022), 2022
In-garage shelter installation
$5,600–$7,500
per shelter
Typical market range — Fixr — Cost to Build a Storm Shelter (updated August 18, 2022), 2022
Shelter figures here are national market ranges published by a third party, not A Class Septic Services prices; we estimate free.
Free estimate: (678) 863-5620Your options
OPTION 01
When it fits: There is a dry, accessible spot within 150 feet of the house, outside flood hazard areas and clear of the septic system.
OPTION 02
When it fits: High groundwater, flood hazard areas, rock close to the surface, or occupants who cannot manage stairs.
OPTION 03
When it fits: Homes with a slab garage where a unit can be set below the floor.
Warning signs
Want a site checked for a shelter? Call (678) 863-5620
Where we do this
FAQ
Straight answers, with the rule or record behind them. Still unsure? Call and ask the crew that digs.
(678) 863-5620A 2022 national cost guide from Fixr puts underground storm shelters at about $4,300 to $17,000 and the typical shelter of any type at $3,900 to $9,000, averaging about $5,800. Prices have likely risen since. Size, unit material, rock in the excavation and whether the site needs drainage work drive the final number.
Source: Fixr — Cost to Build a Storm Shelter (updated August 18, 2022)
Both must meet the ICC 500 standard. A safe room also meets FEMA's funding criteria from FEMA P-361, which are more conservative; the biggest difference is that a residential safe room must be designed for 250 mph tornado winds wherever it is built. FEMA recommends applying safe room guidance to every storm shelter, even without grant money.
Not inherently. FEMA P-320 says an above-ground safe room that meets FEMA P-361 is just as safe as a below-ground one. In-ground units get natural debris protection from the surrounding soil; above-ground units must pass impact testing instead. Above-ground is the better choice where groundwater is high, flooding is possible, or occupants struggle with stairs.
Expect to need a building permit from your county or city. FEMA notes that the 2021 and 2024 International Residential Code require signed and sealed construction documents with each residential storm shelter permit application unless the shelter is a prefabricated unit listed and labeled to ICC 500. Check with your local building official before ordering a unit.
FEMA says a tornado safe room for a one- or two-family home should provide at least 3 square feet of floor area per person, which also meets ICC 500's minimum for residential tornado shelters. A hurricane safe room, where people may stay 24 hours or more, needs at least 7 square feet per person. Plan for guests and pets.
It can if it is badly sited or built. FEMA requires in-ground safe rooms to be anchored against groundwater uplift, recommends an interior sump pump, and wants the ground graded to slope away from the entrance. It also bars shelters from floodways. FEMA records a 2015 case in Oklahoma where a woman drowned in a flooded storm cellar.
The National Weather Service office in Peachtree City says tornadoes have been reported in its area in every month, but most occur from March through May. Its climatology shows about 6 tornado days a year across the forecast area. Fall and winter outbreaks happen too, so a shelter installed in winter is ready before the spring peak.
Possibly, if it fits within Georgia Power's rules. Its Lake Sinclair guidelines require all construction to be outside the project boundary and at least 75 feet from the shoreline, and the septic system and its repair area must also fit on the lot without disturbing the boundary. Talk to Georgia Power's lake resources office and your county before choosing a spot.
Source: Georgia Power — Lake Sinclair Dwellings and Additions guidelines
Keep going
Excavation & Site Work
Sources
Rules, costs and local facts on this page link to the agency, code or publisher that states them. Cost figures are third-party market ranges, not our prices — estimates are free.
Reviewed by A Class Septic Services · Last updated
Ready when you are
An in-ground shelter is an excavation job first: the hole, the base, the anchoring and the drainage decide whether it stays dry and stays put. We dig, set and backfill shelters and prepare sites for safe rooms built to FEMA and ICC 500 criteria.
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