Check local codes, flood risk and permits before designing
Safe rooms are structural work and usually need a permit. Flood risk can rule out a below-ground room entirely.
How
- Ask your building authority whether a safe room or shelter needs a permit and which standard it must meet. In the US, ICC 500 is referenced by the IRC and IBC; elsewhere the rules differ, so ask locally.
- Check the flood map. FEMA says safe rooms are not allowed in floodways and should be outside high-hazard coastal flood zones; in a mapped flood zone it gives elevation rules (US example).
- FEMA advises that basement safe rooms are not suitable where there is a flood hazard, and that a safe room should never be used in place of obeying an evacuation order.
- Record the answers in your permit file so the structural engineer and builder design to the right rules.
Do these first
Sources
- Residential Safe Rooms and Flood Hazards fact sheet (2021). FEMA, accessed 2026-11
- FEMA P-320 Taking Shelter from the Storm: Building a Safe Room for Your Home or Small Business (6th ed., 2nd issuance). US Federal Emergency Management Agency (FEMA), accessed 2026-11
- Safe Rooms and Storm Shelters (Building America Solution Center). US DOE / Pacific Northwest National Laboratory, accessed 2026-11