Apartment Door Security: The Complete Checklist

What the burglary data says about doors

The best available federal data on how burglars get in comes from the Bureau of Justice Statistics report Victimization During Household Burglary, based on National Crime Victimization Survey data from 2003 to 2007. It breaks the roughly 3.7 million annual household burglaries into three types: forcible entry (about 1,134,000 per year), unlawful entry without force (about 1,950,000 per year), and attempted forcible entry (about 629,000 per year).

Run the numbers on completed burglaries and the picture is uncomfortable: of the roughly 3.08 million completed burglaries per year in that dataset, about 63 percent were unlawful entries, meaning the burglar got in without force, most often through an unlocked or open door or window. Only about 37 percent of completed burglaries involved forcing the way in. The data is older (we could not find a newer BJS entry-method breakdown of this kind), but the implication has not changed: the cheapest, most effective apartment door upgrade is using the lock you already have, every time, including when you are home.

Two more findings from the same report are relevant to apartment dwellers. A household member was home during about 28 percent of burglaries, which is the scenario door jammers are built for. And for burglaries while someone was home, households in structures of 10 or more units were among the least likely to be victimized (about 8 per 1,000 households, a rate shared with single-family homes), so apartment living carries some structural advantage in exactly the occupied-home scenario. Hardware should close the remaining gap, not fight the wrong war. Deterrence layers like signs and visible devices are a separate question, covered in do security signs deter burglars.

Door jammers and security bars

A door jammer or security bar braces the door against the floor so it resists being forced inward. Nothing is drilled, so every device in this class is renter-legal. They only work while you are inside (you cannot set one and then leave), which matches the when-someone-is-home scenario in the burglary data.

Published strength ratings are rare in this category, so here is what each maker actually publishes, as of August 2026:

The Buddybar's 2,560 lb figure is the only numeric load claim we found in this class, and it is a manufacturer test claim, not an independent certification; the maker has no standalone product site, so the figure appears only on the brand's own retail listings. Master Lock publishes construction specs (20-gauge steel on the 265D) but no force number; note that Master Lock has discontinued the 265D and points buyers to the 270D folding bar. The DoorJammer trades strength headroom for portability and works even on doors with no lock at all.

Fit caveats that matter in real apartments: floor-braced bars need a firm floor surface (deep carpet reduces grip), and under-door wedge devices like the DoorJammer need clearance under the door and no weather-seal strip in the way. Check your door bottom before buying.

One safety note: any device that slows entry from outside also slows your own exit. Choose devices with quick-release designs, practice removing yours, and never jam a door that is your only fire exit in a way you cannot undo in seconds.

Portable door locks

Portable door locks clamp into the existing strike plate, so they reinforce the door at the point where the latch already engages. Like jammers, they install and remove in seconds, need no tools, and are only usable while you are inside.

The Addalock (the original portable door lock) is the reference product here: $17.95 from the manufacturer as of August 2026, chrome-plated carbon steel, and it works on almost any inward-swinging hinged door by hooking its claws into the strike plate and locking the door against its own frame. The maker publishes no force rating, and we could not find one elsewhere.

Where portable locks fit in an apartment plan: bedroom doors, roommate situations, short-term sublets where you do not control the main lock, and travel. They are lighter-duty than a floor-braced bar; if you only buy one device for the entry door, buy the bar. If you want a second layer or something pocketable, add the portable lock.

What landlords allow, and what needs permission

The renter-legal line is simple: anything that installs without screws, holes, or permanent adhesive damage is yours to use. That covers every jammer, bar, portable lock, and stick-on sensor on this page.

The upgrades that actually strengthen the door assembly itself usually cross the line into landlord territory:

• Longer strike-plate screws (3 in screws reaching the wall stud) and reinforced strike plates require driving screws into the frame. Cheap and genuinely effective, but it is a modification to the landlord's property, so ask first. Many landlords say yes because it survives your tenancy.
• Door reinforcement kits and wrap-around latch guards require drilling. Same rule: written permission first.
• Replacing or rekeying the deadbolt is typically restricted by lease terms, because the landlord needs access for emergencies. Some jurisdictions require landlords to rekey between tenants; your lease and local law control here, and we are not offering legal advice.
• A chain latch or swing bar installed with screws also needs permission, and neither is stronger than a floor-braced bar anyway.

If you rent long-term and your landlord is cooperative, the strike-plate screw upgrade is the single best value in door hardening and costs a few dollars. If the answer is no, the no-drill stack above gets you most of the way for the time you are actually home, which is when the confrontation risk exists.

Door sensors

Hardware resists entry; sensors tell you entry happened. A contact sensor on the apartment door gives you an open/close log, a phone alert, and (if part of an alarm system) a siren and optional monitoring response.

Stick-on contact sensors are adhesive-mounted, so they are renter-legal by default. As one anchored example, SimpliSafe sells its Entry Sensor for $15.99 as of August 2026, and its ecosystem is one of several no-drill systems built for renters. If you want the full system picture (hubs, keypads, monitoring options, and which brands let you take everything with you when you move), that is covered in home security for renters.

A standalone door alarm (a sensor with its own built-in siren, no hub) is the minimum viable version: it will not notify your phone, but it converts a quiet entry into a loud one. Note the honest limitation of every self-monitored sensor: it alerts you, and then the response is on you. Only professionally monitored systems put a dispatch request between the alert and nothing happening.

Peepholes and viewers

Seeing who is at the door before opening it removes the social-engineering path, where an intruder talks the resident into opening the door voluntarily.

If your door already has a peephole, two no-drill upgrades exist: swapping the peephole insert for a wider-angle viewer (uses the existing hole, but technically replaces landlord hardware, so ask), and hanging a digital door viewer that mounts through the existing peephole hole with a bracket, no new drilling. If your door has no peephole at all, adding one means drilling a hole through the door, which is squarely landlord-permission territory.

A video doorbell is the modern alternative, but in an apartment corridor it records your neighbors, and some buildings and leases prohibit cameras in shared hallways. Check the lease before mounting anything camera-shaped outside your door. A no-drill workaround many renters use is a doorbell or small camera mounted inside, facing the door, which stays entirely within your unit.

The checklist

Work top to bottom. Items 1 through 4 cost nothing.

1. Lock the door every time, including when home. The federal data says no-force entry is the most common way in.
2. Lock accessible windows and any balcony or fire-escape door with the same discipline.
3. Test the existing deadbolt: does it throw fully into the strike plate? If not, report it to the landlord; working locks are their obligation.
4. Never open the door to unverified visitors; use the viewer first.
5. Add a floor-braced door jammer or security bar for when you are inside ($24.99 to $118.95 across the devices covered here, as of August 2026). Check floor surface and under-door clearance before choosing.
6. Add a portable door lock for bedroom doors, sublets, and travel ($17.95 for the Addalock, as of August 2026).
7. Put a contact sensor or door alarm on the entry door (from $15.99 for a SimpliSafe Entry Sensor, as of August 2026).
8. Upgrade the viewer situation: wider-angle peephole or interior-mounted camera, within lease rules.
9. Ask the landlord, in writing, for the strike-plate screw upgrade (3 in screws). It is the best value in the whole list if approved.
10. Practice removing your jammer and any secondary lock quickly. Door hardening must never slow your own exit in a fire.

If you follow only steps 1 and 5, you have addressed both the most common entry method (unlocked doors) and the highest-stakes scenario (entry attempt while you are home).