TL;DR
The weakest point of a typical residential door is the strike plate — the metal plate around the deadbolt that's screwed into the door casing with 3/4-inch screws. Replace it with a reinforced strike plate secured with 3-inch screws into the stud. This $10 fix makes kick-in dramatically harder. Add a Grade 1 deadbolt if yours is Grade 2 or below. For windows, 8-mil security film converts a 5-second glass break into a 3-5 minute barrier.
Why Doors Fail
A residential entry door kick-in typically fails the frame, not the door. The process takes seconds:
- The kick concentrates force against the door near the deadbolt
- The force transfers to the strike plate
- The strike plate is typically secured with 1-inch or 3/4-inch screws into the door jamb (casing)
- The casing separates from the structural stud frame
- The door swings open with the frame still attached to it
The door may be solid-core hardwood. The deadbolt may be Grade 1. None of it matters if the strike plate screws are 3/4 inch into soft wood casing.
The $10 Fix That Matters Most
Replace the existing strike plate with a reinforced version using 3-inch screws that penetrate through the casing into the structural stud behind it.
What you need:
- Reinforced strike plate (Strikemaster II, Door Armor, or similar) — $10-30
- 3-inch #10 wood screws (4-6 per plate)
- Drill, screwdriver
This single modification dramatically increases resistance to kick-in. Studies have shown standard doors failing in 1-3 kicks; properly reinforced frames can withstand 10+ kicks and often stop the attack entirely.
For exterior doors without solid-core door slabs: If the door itself is hollow-core (sounds hollow when knocked), the door slab is also a vulnerability. Hollow-core doors are interior doors that occasionally end up on exterior openings in older homes. Replace with solid-core or fiberglass exterior door.
Deadbolts
Grade 1 vs. Grade 2 vs. Grade 3: ANSI/BHMA (American National Standards Institute / Builders Hardware Manufacturers Association) grades deadbolts on forced entry resistance. Grade 1 is commercial/security grade; Grade 3 is builder-grade residential. Most homes have Grade 2 or Grade 3 deadbolts.
Grade 1 deadbolts (Schlage B60N, Medeco M3, Kwikset 980) offer significantly better pick resistance, drill resistance, and pull resistance. Price difference is $30-70 over a builder-grade lock.
Minimum specification:
- Grade 1 deadbolt
- 1-inch throw (the bolt extends 1 inch into the frame when locked)
- Hardened steel bolt (resists sawing)
- Anti-pick and anti-drill pins (essential for Grade 1 compliance)
Double-cylinder deadbolts: These require a key from both sides — the interior also has a keyhole rather than a thumb turn. They prevent a threat from breaking a window adjacent to the door and reaching in to turn the deadbolt. However, they create an egress hazard (trapped in a fire without a key). Not recommended for occupied dwellings without careful thought.
Door Frame and Hinge Reinforcement
The strike plate fix addresses the most common failure mode. Two additional vulnerabilities worth addressing for high-risk applications:
Hinge bolts: On doors with hinges on the exterior (visible to someone standing outside), the hinges become a bypass. Hinge pins can be removed to defeat the door regardless of lock quality. Install non-removable hinge pins (set screws that prevent pin extraction) or security stud hinges. Most residential doors have interior hinges; check yours.
Door frame reinforcement kit (Door Armor, StrikeMaster): Full kits reinforce the entire door frame — both hinge side and strike side — with steel channel and long screws. Cost $50-100 for a complete kit. Worth it for primary exterior doors, especially in extended emergency scenarios.
Window Security Film
Security window film is polyester laminate applied directly to the glass. 3M Safety S Series (8 mil) is the standard residential specification.
What it does: When glass breaks, the film holds fragments together as a flexible barrier. A single strike that would normally clear a pane in 5 seconds now requires persistent effort to work through — minutes rather than seconds.
What it doesn't do: Prevent glass from breaking or maintain transparency after the initial strike. The glass will break; the film holds the shards.
Installation:
- Surface must be clean — no oils, dust, or residue
- Film is applied with soapy water to allow positioning
- Squeegee out bubbles, trim edges
- Allow 3-5 days to cure fully
- Professional installation is available; DIY is achievable for standard rectangular windows
Cost: DIY film runs $0.50-1.50 per square foot for 8-mil security film. A standard window (3x4 feet) costs $6-18 in film. Professional installation is 3-4x the material cost.
Window Locks
Standard residential window locks (the latches built into double-hung windows) are minimal. Supplement with:
Sash locks: Secondary locks that bolt the window shut. $5-10 each. Drill a small hole, insert a bolt — the window cannot be opened even with the built-in latch defeated.
Key locks: For windows at ground level and basement windows, consider key-operated window stops that prevent the window from being opened by someone who has removed or bypassed the interior latch.
Sliding door security: Sliding glass doors are vulnerable to being lifted off their tracks and removed. A cut-off broomstick in the track prevents opening. For higher security, a sliding door security bar (Charley bar) prevents both forced opening and lifting.
The Complete Door Package
Priority order for a typical residential exterior door:
- Strike plate reinforcement — $10, highest impact
- Grade 1 deadbolt — $50-80 if currently Grade 2 or below
- Door frame reinforcement kit — $50-100
- Security film on adjacent windows and door glass — $20-60
- Peephole or door camera — $20-150, for observation before opening
Total for complete reinforcement of one exterior door: $130-370 depending on what's already present and which products are chosen.
Sources
Frequently Asked Questions
Most residential doors can be kicked in with one strike. Is this really true?
Yes. FBI and law enforcement research consistently shows that most residential break-ins occur through doors, and most residential doors are vulnerable to kick-in because the strike plate — the metal plate around the deadbolt latch — is secured with screws that only reach the door casing, not the structural framing. A kick against the door transfers force to the strike plate screws, which fail immediately. The door itself may be fine; the frame fails. Replacing the strike plate with a 3-inch deep-penetration model secured with 3-inch screws into the stud frame resolves this vulnerability for under $10.
What is window security film and how much does it help?
Security film is a thick polyester laminate applied to the glass surface. It doesn't prevent glass from breaking, but it holds broken glass fragments together, preventing the pane from being removed quickly. Without film, broken glass is cleared in seconds. With 8-mil security film, a broken pane may take minutes to work through — enough time for detection to trigger and response to begin. 3M Safety Series S80 (8 mil) is the standard residential recommendation.
Should I bar my windows?
Window bars (security bars, window grilles) are the most effective window security measure but create a serious life-safety hazard — they prevent emergency egress in a fire. If you install bars, every barred window needs an emergency release mechanism operable from the inside without a key. Many jurisdictions require this by code. Consider security film as an alternative that provides delay without creating an egress hazard.