Break-In Prevention: How Forced Entry Really Happens, and How to Stop It
The lock is almost never what fails. The jamb splits, the strike tears out, and the deadbolt is still perfectly intact lying in the hallway. Fix the part that actually breaks.
Quick answer
Break-in prevention works best at the door frame, not the lock. Replace short strike screws with three-inch screws into the framing, fit a reinforced box strike, use a Grade 1 or Grade 2 deadbolt with a full one-inch throw, secure patio sliders and basement windows, and remove the cover and darkness that let someone work unseen.
Almost every conversation about break-in prevention starts in the wrong place. People ask which lock is unpickable. Picking a lock takes skill, time, and a reason to bother, and it is not how a house gets opened. A house gets opened because someone put a boot next to the deadbolt and the wood around the strike gave way.
That distinction changes what you should spend money on. A $340 high-security cylinder screwed into a jamb with three-quarter-inch screws is a strong lock attached to nothing. A $30 reinforced strike with three-inch screws into the framing behind the jamb, on an ordinary Grade 2 deadbolt, will resist far more force. One of those two upgrades costs ten times the other, and it is not the one that helps most.
What follows is the mechanics of forced entry as a technician sees it after the fact, the upgrades worth doing in order of value per dollar, and what to do in the hours after a break-in if it has already happened.
What actually fails when a door is forced
Pull apart a forced residential door and the story is consistent. The deadbolt is undamaged. The lock body is fine. The strike plate is bent or torn free, and the jamb has a long vertical split running from the strike mortise up and down the grain.
The reason is straightforward. A residential door jamb is typically a piece of finger-jointed pine about three-quarters of an inch thick, nailed to the rough opening with a gap of half an inch or more behind it, packed with shims and a little foam. The lock bolt engages a strike plate held on by two screws that are usually three-quarters of an inch long. Those screws bite into that thin jamb board and nothing else. The framing stud, which is the only structural thing nearby, is the far side of that shim gap and the screws never reach it.
So the load path from a kick runs: bolt, strike plate, two short screws, three-quarter-inch pine. The pine loses. It splits along the grain, the plate comes with it, and the door swings open with the deadbolt still fully extended.
The second common route is the door slab itself on cheap hollow-core or thin-skinned units, where the lock tears through the stile rather than the frame. The third is a window or a slider, and the fourth is simply an unlocked door — a garage left open, a back slider nobody checked, a side entry.
That is the entire mechanical picture, and it points at exactly where the money goes.
The ten-minute upgrades that matter most
Ordered by how much resistance you gain per dollar and per minute. The first one is not close.
Three-inch screws into the framing
Remove the short screws in every exterior strike plate and hinge and replace them with three-inch wood screws that pass through the jamb, cross the shim gap and bite into the stud. Cost is a few dollars per door. This single change moves the load from a thin pine board onto the house frame and is the highest-value security upgrade available to a homeowner.
A reinforced box strike
Replace the flat stamped strike with a heavy box strike that wraps the bolt and spreads the load over a larger area of jamb. Combined with long screws, this is what makes a kick fail. Around $25 to $60 per door for the plate, or fitted during any lock visit.
A Grade 1 or Grade 2 deadbolt with a full one-inch throw
Bolt length decides how much jamb has to break before the bolt clears. Measure yours: throw the bolt with the door open and look at how far it stands proud. Anything under an inch is a builder-grade compromise. Fitted, expect $160 to $320 depending on grade.
Close the door gap
A wide gap between door and jamb lets a bar get purchase and lets a bolt be jimmied. Adjust the stop, add a solid-metal wrap-around door edge reinforcer if the stile is weak, and check that the door closes without daylight around the latch side.
Hinge screws too
On an outswing door, or any door where the hinges are accessible, the hinges are half the fight. Long screws in every hinge leaf, and non-removable hinge pins or a set of hinge studs on outswing doors.
All five together are perhaps ninety minutes of work and a couple of hundred dollars in parts on a typical house. They are also frequently done in the same visit as a rekey, which is worth knowing if you are already booking a lock replacement or a rekey.
Layered deterrence: making the job slow, loud and visible
Beyond the door itself, the useful principle is that forced entry is a decision made quickly by someone who wants to be somewhere else. Anything that adds time, noise or the chance of being seen changes that decision, and none of it requires an expensive system.
Sightlines matter more than most gadgets. A front entry visible from the street and from two neighbours is a difficult place to work. A side door behind a six-foot cedar hedge, with the recycling bins stacked beside it, is not. Cut back what screens the entry doors, even though it means less privacy on the porch. Gravel or wood chips under ground-floor windows is quietly effective for the same reason: it makes noise.
Lighting works when it is placed where someone would have to stand, not where it looks nice. Walk the house after dark and note the corners you cannot see from the street or from a window. Motion-activated fixtures aimed at those spots do more than a floodlit facade, which mostly ruins your own night vision and your neighbours sleep.
Cameras deter in proportion to how obviously they are watching the approach, and they are genuinely useful afterwards for identification and insurance. Position them to cover the path to the door at face height rather than mounted at the roofline looking down at the tops of heads. If you are adding them, camera installation is straightforward on most local houses.
A dog, a visible alarm decal on the door someone would use, an interior light on a timer that changes rooms through the evening, and a car in the driveway all work along the same line: they suggest occupancy and attention.
Sliders, basement windows and the back of the house
The front door gets the attention and the back of the house gets the entry. Sliders and basement openings are worth a specific pass.
- Patio slider, track bar. A bar or a cut length of broom handle in the track stops the panel sliding. Cheap, instant, and it should be in every slider in the house.
- Patio slider, lift-out. Many sliders can be lifted up and out of the bottom track even when latched. Anti-lift screws driven into the top track, adjusted so the panel clears by only a couple of millimetres, prevent it.
- Slider latch quality. The factory latch is a catch designed to hold the panel closed against wind. A secondary pin lock through the frame is what actually secures it.
- Basement windows. Small, low, often screened by shrubs, and frequently with hardware painted open or a stripped crank. Test every one, and consider a security film or a bar on any that cannot be seen from the street.
- Window wells. A well cover that latches from the inside keeps a window well from being a private room to work in.
- Basement walk-out. Treat it as a full exterior door: Grade 2 deadbolt minimum, reinforced strike, long screws, good lighting.
- Second-floor windows over a porch roof or deck. Roof access makes them ground-floor windows. Latch them.
- The garage. An open overhead door turns your garage-to-house door into your front door. Make sure that door is solid core, deadbolted and reinforced.
If a door or frame has already been damaged in the past and never properly repaired, it is weaker than it looks. Burglary damage repair means repairing the frame and the strike, not just hanging a new lock on split wood.
Going away: what to do before you leave
- Stop the mail, or ask a neighbour to collect it daily. An overflowing community mailbox slot or a pile of flyers is the clearest possible signal.
- Have the driveway shovelled and the lawn cut on the normal schedule. In a Newmarket winter an unshovelled drive after a storm says more than any other single thing.
- Put interior lights on timers that change rooms through the evening, not one lamp burning from dusk to dawn.
- Tell exactly one trusted neighbour, and give them a number to reach you. Tell nobody on social media until you are home.
- Ask a neighbour to park in your driveway occasionally.
- Lock the interior garage door and remove the overhead opener remote from any vehicle left outside.
- Set the slider bars and check every window before you leave, including the basement.
- Put valuables and documents somewhere that is not the master bedroom, which is the first room searched.
- Unplug and secure anything an opener could use: ladders in the yard, tools in an unlocked shed, patio furniture that can be dragged to a window.
None of this is dramatic. It is a fifteen-minute routine that makes an empty house look occupied, which is the only thing that actually matters while you are away.
The hours after a break-in
If it has already happened, the order matters. Do not go inside if there is any chance someone is still there. Call the police from outside or from a neighbour, and wait.
Once you are cleared to enter, photograph everything before touching it — the damaged door, the frame, the point of entry, and the rooms as they were left. Insurers want that, and so does any subsequent claim about the repair.
Then secure the property tonight and repair it properly in daylight. A board-up on a broken door or window costs $250 to $600 and is a legitimate overnight solution; a full frame and hardware repair is daytime work. A door that has been forced usually needs the jamb section replaced or reinforced, a new strike, long screws, and often a new lock if the bolt or lock body took the impact.
Rekey or replace every exterior cylinder within a day or two even if nothing obvious was taken. Keys go missing in a break-in and the loss is not always noticed. Our rekey or replace guide covers which one your hardware needs.
Finally, use the repair visit to do the upgrades in section two. Long screws, a box strike and a proper deadbolt on the door that failed, and on the ones that did not. Most people who have been through this once do not want to be told about it a second time, and the fix is genuinely straightforward.
Door hardening we do
Door hardening across Newmarket and nearby
The housing stock shapes the work. Subdivision homes from the 1980s and 1990s in Glenway, Bristol-London and Huron Heights almost always have short strike screws and a garage man-door worth attention. Century homes off Main Street South have deeper, older jambs and mortise hardware that needs a different approach. Newer East Gwillimbury and Sharon builds have good doors and thin builder cylinders. We work across all of it from the same Newmarket base.
Frequently asked questions
What is the best way to stop a door being kicked in?
Reinforce the frame, not the lock. Replace the short strike screws with three-inch screws that pass through the jamb and into the stud, fit a heavy box strike that spreads the load, and use a deadbolt with a full one-inch throw. That combination moves the force from a three-quarter-inch pine board onto the house framing, which is what actually resists a kick.
Do high security locks prevent break-ins?
They prevent picking, bumping and key copying, which are real but uncommon problems. They do not help against force, because force does not attack the cylinder. Fit a high-security cylinder if you want to control who can copy your keys or you are protecting a business. Fit long screws and a box strike if you want the door to survive being kicked.
How do burglars usually get into a house?
Through the weakest point they can reach quickly and unseen. Most often that is a forced door where the jamb splits around the strike, an unlocked door or garage, a patio slider that is only latched, or a basement window screened by shrubs. Skilled attacks on the lock itself are rare, because they are slower and harder than breaking wood.
How do I secure a sliding patio door?
Three things. Put a bar or a cut dowel in the track so the panel cannot slide. Drive anti-lift screws into the top track so the panel cannot be lifted out even when latched. Add a secondary pin lock through the frame, because the factory latch is a catch designed to hold the door against wind, not a lock.
Are security cameras worth it for a house?
They deter when they are visible along the approach and they are genuinely useful afterwards for identification and for an insurance claim. Position them at face height covering the walk to the door rather than at the roofline looking down. They are one layer, not the whole answer, and they do nothing to stop a frame from splitting.
What should I do immediately after a break-in?
Do not go inside if there is any chance someone is still there. Call police from outside and wait. Once cleared, photograph the entry point, the damage and the rooms before touching anything. Secure the property overnight with a board-up if a door or window is open, then repair the frame and hardware properly in daylight and rekey every exterior cylinder.
Should I change my locks after a break-in?
Yes, and repair the frame at the same time. Keys frequently go missing in a break-in without being noticed, so rekeying every exterior cylinder is sensible even if nothing obvious was taken. Where the lock body or bolt took the impact, replace the hardware. Rekeying alone does not fix a jamb that has already split.
How can I make my house look occupied while I am away?
Keep the routine visible. Have the drive shovelled and the lawn cut on schedule, stop or collect the mail daily, run interior lights on timers that move between rooms through the evening, and have a neighbour park in the driveway occasionally. Tell one trusted neighbour and nobody online until you are back.
Related locksmith services in Newmarket
Get the frame reinforced, not just the lock changed
Call 866-820-1331 to book door hardening, or for an emergency board-up and repair after forced entry. Licensed and insured, 24 hours a day, with a typical Newmarket response of 20 to 30 minutes.
