TL;DR
A door's security is limited by its weakest element. Most residential doors have three: hollow-core construction, standard strike plates anchored with short screws, and Grade 3 lock hardware. Fix all three and your door resists kicks that would defeat a standard installation in one blow. Total cost: $150-300. Total time: one afternoon.
The Mechanics of a Door Kick-In
Understanding the failure helps you fix the right thing.
When someone kicks a door, force is applied to the door face near the lock. That force transmits through the door to the lock, through the latch or bolt, to the strike plate, through the strike plate screws, to the door frame. The failure almost always occurs at the strike plate connection — short screws in soft wood trim pull out under the load.
The door itself rarely fails. The deadbolt itself rarely fails. The frame fails.
This is why most internet advice about upgrading locks is incomplete. A better lock bolted into a failing frame provides minimal improvement. You need to fix the frame first.
Upgrade 1: Frame Reinforcement
Standard installation: A standard residential strike plate is 3 inches long, 1/8-inch thick, and anchored with two 3/4-inch screws into the door stop (trim piece). These screws go into soft wood that is essentially decorative.
Security plate upgrade: A security strike plate (like the Don-Jo 1605 or the Strikemaster II) is 6-12 inches long, 1/4-inch steel, with 4-6 anchor holes. Install it with 3-inch #10 wood screws that penetrate through the door stop trim and reach the structural wall framing (a 2x4 stud running vertically beside the door opening).
Installation:
Hinge reinforcement: Door hinges are the other failure point. Standard hinges use short screws into trim. Replace all hinge screws with 3-inch screws reaching the framing. For exterior doors, add a hinge bolt (security hinge pin that engages a hole in the opposite hinge leaf when the door closes) to prevent hinge removal from outside on doors that open outward.
Upgrade 2: Deadbolt Upgrade
Grade requirements: ANSI Grade 1 minimum for any exterior door. Key specifications:
- Bolt throw: Minimum 1 inch, hardened steel
- Anti-drill plate: Hardened steel plate covering the bolt cylinder protects against drill attacks
- Anti-pick pins: Spool or mushroom pins that resist picking
Recommended brands: Schlage B-series (B60N is the entry-level Grade 1), Kwikset SmartKey 980, Medeco (highest security, significantly more expensive, pick-resistant cylinders).
Installation notes:
- Deadbolt should be at least 6 inches above or below the doorknob (combined attack on both simultaneously is a known technique)
- Double-cylinder deadbolts (key required on both sides) provide security against glass-adjacent doors but are a fire egress risk — use only on doors with no adjacent glass
Upgrade 3: Door Security Bar
A door security bar (floor-to-handle brace, also called a door bar or security bar) changes the mechanical failure point from the frame to the floor.
How it works: The bar extends from the door handle or a bracket near the handle, angling down to a rubber floor pad. When kick force is applied, the bar transfers force vertically through the bar to the floor — bypassing the frame and lock system entirely. The floor absorbs and distributes the load across a much larger area.
Types:
- Floor-angled bar: Angle brace from handle to floor. Works best on hard floors where the rubber pad grips. Less effective on carpet or smooth tile.
- Horizontal bar (Buddybar, Master Lock security bar): Horizontal metal bar that engages a bracket mounted on the door, extending to a floor bracket. Provides the mechanical advantage of the floor connection without requiring the right angle for effectiveness.
Important limitation: Security bars are effective against kick-in attacks from outside. They do not help if the lock is defeated (key or pick). Their primary use case is as an additional layer of resistance during occupied periods, particularly at night.
The Complete Door Package
For an exterior door that will resist realistic threats:
| Component | Upgrade | Cost | |---|---|---| | Door itself | Solid core (if replacing) or inspect existing for hollow spots | $200-400 (replacement) | | Strike plate | 12-inch steel security plate, 3-inch screws to framing | $20-40 | | Deadbolt | ANSI Grade 1 (Schlage B60N or equivalent) | $60-120 | | Hinges | Replace screws with 3-inch, add hinge bolts on outswing doors | $20-40 | | Security bar | Horizontal or angled bar | $30-60 | | Door viewer | 200-degree peephole with cover | $20-30 | | Total | | $350-690 |
This is significant security improvement for a modest cost. A door with all five upgrades will defeat almost all opportunistic attacks and significantly delay more determined ones.
Sliding Doors and Patio Doors
Standard sliding glass door tracks can be lifted off with the right technique — the door simply lifts out of the track. Two security additions:
- Track blocker: A cut-to-length piece of hardwood or metal rod in the track. Prevents the door from opening even if the lock is defeated.
- Anti-lift pin: A bolt or pin inserted through the frame into the door at the top of the sliding panel. Prevents the lift-and-remove technique.
The glass itself is the primary vulnerability — address it with security film as described in the window security guide.
Sources
- FBI Uniform Crime Report - Burglary Methods
- ANSI/BHMA A156.30 - Standard for High Security Locks
- Door Security and Safety Foundation
Frequently Asked Questions
Where do most kick-in failures actually happen?
The door frame, not the door or lock. Standard door frames use a thin strike plate anchored with 3/4-inch screws into soft wood trim, not structural framing. One solid kick focuses enormous force on that small strike plate, which tears out of the trim in one motion. Replacing the strike plate with a heavy-gauge steel security plate and 3-inch screws that reach wall framing changes the physics dramatically.
What is a Grade 1 deadbolt?
ANSI/BHMA security grade classification rates lock hardware from Grade 1 (highest security) to Grade 3 (lowest). A Grade 1 deadbolt has tested to withstand 10 kick attacks without failure and a minimum 1-inch throw bolt of hardened steel. Most residential locks sold at big box stores are Grade 2 or 3. Grade 1 deadbolts (Schlage B60N, Kwikset 980, Medeco) cost $50-150 and are a direct upgrade.
Does a door security bar (floor bar) actually work?
Yes. A door security bar (angled brace from door handle to floor) redirects kick force from the door hardware to the floor — specifically to the floor contact point, which transfers the load into the structural floor rather than the door frame. Combined with frame reinforcement, this creates a system that resists kick-in forces far beyond standard residential hardware.