New Home Security Checklist: First 48 Hours

Updated March 2026 · Silent Security Research Team

Moving into a new home is exciting — and also a security risk. You have no idea how many copies of the keys exist, what the previous owners left behind on the network, or what the neighborhood patterns look like. This checklist covers everything to do in your first two days.

Key fact: The average home key is copied 2-3 times over its lifetime. Former owners, contractors, housekeepers, neighbors, and real estate agents may all have copies of your new home's keys. Re-keying within 24 hours is the single most important first step.

Day 1 — Physical Security

Re-Key or Replace Every Lock

A locksmith can re-key all locks to one new key for $100-200 — far cheaper than replacing locks. If the locks are older or lower-quality, this is a good time to upgrade to deadbolts with ANSI Grade 1 rating. Do every exterior door including garage entry doors.

Change the Garage Door Code

Go into your garage door opener settings and change the 4-digit keypad code. Also check if the opener supports rolling codes (most modern ones do) — this prevents code-grabbing theft. If you have a portable remote, change its code too.

Walk the Perimeter

Look for: unlocked side gates, window locks that don't engage, basement windows without locks, exterior outlets that could power equipment, and any entry points that seem unusually accessible. Note where your utility shutoffs are (water, gas, electric).

Test Existing Smoke & CO Alarms

Press the test button on every alarm. If any don't respond or chirp (low battery), replace immediately. Check the manufacture date on the back — smoke alarms expire after 10 years, CO detectors after 5-7 years. Install new ones if expired.

Locate Fire Extinguisher & Know Escape Routes

Every home should have at least one ABC-rated fire extinguisher in the kitchen. Draw a rough floor plan and identify two exit routes from every bedroom. If you have children, walk through the escape plan with them.

Day 1 — Digital Security

Replace the WiFi Router (or At Minimum Reset It)

If a router was left by the previous owner, factory reset it and set up a new network name and strong password. Better yet, replace it with your own router — the previous owner may know the admin login and could access your network devices remotely.

Change the ISP Account Password

If you're keeping the same internet provider, change the account password and PIN. The previous tenant's payment info may still be on file, and your bill could be accessed.

Scan for Left-Behind Smart Devices

Smart thermostats, cameras, door locks, and plugs may have been left and are still connected to the previous owner's account — meaning they can see activity in your home. Check every room for devices with indicator lights. Factory reset anything that isn't yours.

Day 2 — Establish Your Security Baseline

Set up exterior lighting with motion sensors at all entry points
Install a video doorbell camera (Ring, Eufy, or Google Nest Doorbell)
Set up a home security system if budget allows — SimpliSafe requires no professional installation
Update your address with USPS, bank, employer, and DMV
Set up USPS mail forwarding from your old address for 12 months
Introduce yourself to neighbors — they become your first alert network
Look up your local NextDoor or neighborhood watch group
Check if your area has a crime map (SpotCrime.com or local police crime portal)
Register your home with local non-emergency police line for vacation watch programs
Add your new address to emergency contacts: doctor, school, workplace

Think of it like this: Moving in is like getting a used car. You wouldn't just trust that everything works — you'd check the tire pressure, make sure there's oil, and get it inspected. Your home needs the same once-over before you rely on it for safety.

New homeowner? Check out our full New Homeowner Security Guide for a deeper dive into long-term home hardening, insurance considerations, and building a security plan that grows with your household.