What the process looks like, step by step
- Site visit and quote (slab thickness, soil if in-ground, access)
- Permit application through the local jurisdiction
- Excavation or slab prep
- Unit delivery and set
- Anchoring and door alignment
- Ventilation, lighting, drainage hookups
- County or city inspection
- Walkthrough and final payment
What you should receive on completion
- ICC 500 test report reference for the installed unit
- Anchoring spec sheet, completed and signed
- Passing inspection record (or scheduled inspection date)
- Written warranty
For the broader decision framework, see our selection guide and 2026 cost ranges.
Frequently Asked Questions
How long does storm shelter installation take?+
An above-ground steel unit installed in a garage typically takes one day. An in-ground steel or concrete unit takes 2 to 5 days depending on soil and drainage. A built-in-place FEMA safe room as an addition runs longer, often 1 to 3 weeks.
Do I need a permit to install a storm shelter?+
In most jurisdictions, yes. Permitting is set at the city or county level. Most installers handle the permit as part of the install. Confirm in writing that the permit is included and who is responsible for the inspection.
Can a shelter be installed in an existing garage slab?+
Yes, for above-ground units, as long as the slab is at least 4 inches of properly cured concrete with appropriate reinforcement. The installer should specify bolt grade and epoxy product. Thinner or cracked slabs may need to be cut and re-poured.
Will installation damage my driveway or yard?+
In-ground installs require excavation and will disturb the area. A reputable installer scopes site restoration in the contract (sod, gravel, concrete patch). Get it in writing before work starts.