Run a smart-home outage drill before the router, hub, or power fails
Test one failure at a time, preserve physical control, record what stays local, and leave with a recovery order instead of a pile of reset devices.
An internet outage and a dead router are not the same test. With the internet disconnected, the home network may still carry local commands and automations. Turn off the router and that local path disappears too. Cut power and every unprotected modem, switch, hub, border router, access point, and plug-in device joins the failure.
The purpose of a drill is not to prove the house is disaster-proof. It is to find one hidden dependency at a time while you can restore it calmly.
The short answer
A safe drill separates four events: internet service loss, router or local-network loss, controller or hub loss, and utility-power loss. Test them one at a time during daylight, with another adult aware, while preserving manual access, life-safety equipment, medical needs, and heating or cooling. Record each important function’s local path, cloud dependency, backup power, physical fallback, and normal recovery time.
Build the recovery card before disconnecting anything
List the modem or fiber terminal, router, mesh nodes, Ethernet switches, smart-home controllers, radio coordinators, bridges, Thread border routers, alarm base, camera recorder, and any uninterruptible power supply. Photograph cable labels and status lights. Record administrator and recovery-account ownership without putting passwords in the sheet. For each important function, name the physical fallback and the pieces in its control path. A front-door entry path might be physical key, keypad, lock radio, hub, network, account, and phone app; those are separate dependencies.
Baseline six household functions
While everything works, test one ordinary light, lock, thermostat adjustment, leak or contact-sensor event, camera view or local recording, and a critical automation. Note whether you used a wall control, vendor app, central dashboard, voice command, or remote connection. Confirm current device status, alerts, and time. This baseline keeps a pre-existing dead battery or broken notification from being blamed on the drill.
Test internet loss while leaving the LAN powered
Use the router or internet gateway’s documented method to disconnect only the WAN service; do not pull random cables from unfamiliar provider or fiber equipment. Keep Wi-Fi, Ethernet, hubs, and controllers on. Repeat the baseline from inside the home. Home Assistant says locally connected Zigbee, Z-Wave, Matter, Thread, and ESPHome devices can continue without internet, while vendor-cloud devices, remote access, and several voice-platform integrations still need it. Record actual behavior for your setup, including whether a local app opens without cloud authentication.
Restore, then simulate a local-network or hub failure
Reconnect the WAN and wait until normal service returns. Next, choose either the router or one hub, not both, and use its documented shutdown or restart procedure. Test physical controls and built-in device behavior only. Which schedules remain inside a thermostat or lock? Does a leak sensor still sound locally? Does a camera continue to a local recorder? Never put the router or hub on a smart plug that cannot turn itself back on without that same router or hub. Restore the selected component before moving on.
Treat power as a planning review unless shutdown is safe
Ready.gov advises keeping phones charged, planning alternative charging, and making specific arrangements for medicines and power-dependent medical devices. Do not switch off the whole house as a smart-home experiment. Instead, verify what is connected to each UPS, its self-test and replacement status, and which network components would still lack power. If a short plug-level test is safe, shut down data-bearing equipment properly first and follow its manual. Generators and transfer equipment require a separate safety plan; never backfeed house wiring.
Recover in layers and inspect before resetting
Use the documented order for the service terminal or modem, primary router, switches and mesh nodes, then hubs, bridges, controllers, and endpoints. Allow each layer to finish. Compare status lights, local functions, cloud functions, automations, camera recording, clocks, and alerts with the baseline. Save logs or screenshots for anything that did not return. Do not factory-reset a device during the drill; a reset destroys the evidence and can create a larger recovery job.
Turn failures into a short correction list
Classify each miss as power, local network, controller, vendor cloud, account, radio coverage, or physical fallback. Fix the highest-consequence gap first: access, safe temperature, water response, alarms, or essential communication before entertainment. CISA recommends current router firmware, strong unique administration credentials, WPA3 Personal or WPA2 AES, and disabling remote management, WPS, and unnecessary UPnP. My opinion: cellular backup is optional for many homes; a tested key, wall control, and local automation path are not.
Put the guide to work
Field notes
- Do not test casually
- Monitored alarms, elevators, gates, sump equipment, medical devices, refrigeration for medicine, combustion controls, fire protection, and extreme-weather heating or cooling need their own provider or professional plan.
- Keep exits ordinary
- Carry physical keys, keep garage and gate manual procedures accessible, leave doors unlocked only when safe and supervised, and never disable smoke, carbon-monoxide, security, or water alarms merely to make the result look clean.
- Choose a quiet window
- Run the drill in daylight when weather is mild, no one depends on a call or remote access, and you have the administrator credentials, vendor support details, labels, and a charged phone using cellular data.
Make the next step useful
Put this guide on your home plan
Know when to call a professional. Stop if work involves active gas leaks, damaged service wiring, structural movement, unsafe heights, suspected contamination, or a problem you cannot confidently isolate.
Editorial review and sources
Reviewed by: Smart Homeowners Editorial Desk
Last reviewed: September 20, 2026
Original Smart Homeowners editorial; not adapted from a third-party article.
