Homeowners usually call us when a front door starts feeling easier to force than it should, or when the lock works but the door still doesn't feel solid. That can happen after a move, after a break-in scare, or when a deadbolt has been patched up one too many times over the years. We install deadbolts on entry doors, side doors, and garage-to-house doors where the frame, the latch, and the screws all have to do their part. A good lock on a weak strike plate still leaves a weak door, so we pay attention to the whole setup, not just the hardware on the outside.
We come to the home and fit the deadbolt where it belongs, with the strike and long screws set to hold the way they should. If the door slab, jamb, or trim needs adjustment for the bolt to throw cleanly, we handle that too. That matters on older houses, on new doors that were never finished right, and on doors that have shifted from weather or settling. If you're in Glen Mills or anywhere across the service area, we can match the job to the door instead of forcing a one-size-fits-all install. The goal is simple: a deadbolt that turns smoothly, seats fully, and gives the door the kind of hold it was meant to have.
We work on the spot, in your driveway or at the curb, so there's no need to take the lock apart and guess at the fit later. If you want a single door upgraded or several entry points brought up to the same standard, we can take care of that during the visit. For homes in Delaware County, Chester County, and New Castle County, proper deadbolt installation is one of the clearest ways to make an entry door feel finished and secure without changing the look of the house.
When you actually need this
A deadbolt earns its place on any exterior door that does not already have one, and that is a more common gap than people expect - particularly on side doors, garage-to-house doors and back doors that were fitted with a knob lock and nothing else.
The reason is that a latch and a deadbolt do genuinely different jobs. A spring latch is shaped to let the door close: it has a bevel, it retracts under pressure, and it is holding the door shut rather than holding it locked. A deadbolt throws a solid rectangular bolt with nothing sprung about it and no bevel to push against. Against somebody leaning on a door, that difference is most of the story.
It is also the answer when an existing deadbolt is too shallow to enter the frame properly, when the bolt no longer throws its full travel, or when the door has never had one because the house was finished with whatever fitted the hole.
What it is not is a substitute for a door that closes properly. If the door needs lifting or shouldering, that gets addressed first - a deadbolt nobody throws because it is stiff protects nothing.
How the work is done
If the door has never carried a deadbolt, it is prepared for one: a bore through the face at the correct height and backset, a smaller bore through the edge for the bolt, and a mortise for the faceplate so it sits flush rather than proud.
The frame is then prepared to receive the bolt, and this is where the job is won or lost. The strike has to line up so the bolt enters cleanly through its full travel with no resistance at all. A bolt that has to be forced the last part of the way is a bolt that people stop throwing fully, and a partly thrown bolt is not doing the job you paid for.
The strike itself matters as much as the lock. A reinforced strike plate is fitted with screws long enough to pass through the jamb and bite into the structural framing behind it, rather than the short screws that come in the box and reach only soft trim.
Then it is cycled - locked and unlocked repeatedly, with the door both open and closed - and keyed to match your other doors where the hardware allows.
What it takes to do it properly
Accuracy, mostly. The bores have to be square to the door and at the right height and backset, because a deadbolt fitted slightly out of true will bind for the rest of its life. Doing this well on a door that has already moved with a century of seasons - which describes a lot of housing here - takes more judgement than a template provides.
The strike has to be positioned from where the bolt actually lands, not from where the drawing says it should. Doors settle; frames move. Marking from the real bolt position is the difference between a lock that throws with one finger and one that needs a shoulder.
The screws are not a detail. Short screws into trim are how a forced door fails, and a reinforced strike into framing costs very little alongside work already happening.
And there is a decision to make honestly before anything is cut: single or double cylinder. Single - key outside, thumbturn inside - is right for almost every home. Double needs a key on both sides, which matters where there is glass beside the door, but it also means nobody gets out in a hurry without a key. That trade-off deserves a conversation, not an assumption.
Getting it right the first time
The failure that matters most is a bolt that does not throw fully. It usually looks fine - the key turns, something moves - but the bolt is entering the strike at an angle or hitting the edge of the hole, and only traveling part of its length. Under pressure it behaves like a latch. The way to catch it is to throw the bolt with the door open and then with it closed and compare; they should feel identical.
The second is the strike screwed into trim. Almost every forced residential door gives way at the frame rather than the lock, and the standard box screws are far too short to reach anything structural.
The third is fitting a deadbolt to a door that was already fighting its frame. The new lock inherits the problem and gets blamed for it.
The fourth is ending up with another key. If the new deadbolt can be keyed to match your existing doors, say so before it is fitted - it is far simpler during the visit than as a return trip, and a key that lives in a drawer because it only opens one door is a door that stops being locked.
What to have ready
Know which doors you want done, and walk the outside of the house once before deciding. The front door is rarely the weak point; the side door into the garage, the door from the garage into the house and the back door are where the gaps usually are.
Decide whether you want them keyed alike with each other and with your existing locks. It is much easier arranged during fitting than afterward.
Have a view on single versus double cylinder, and tell us if there is glass beside or within the door so we can talk it through properly.
If you have a preference on finish, or hardware you have already bought, have it out and ready. If you would rather we specified it, tell us what the door is - timber, metal-clad, storm door in front - and roughly how old the house is.
On the day, expect a small amount of dust from the boring and expect the door to be in use again the same visit. Before we leave, throw each bolt yourself with the door open and closed. It should move with one finger both times, and if it does not, that is the moment to say so.
Related services
Deadbolt Installation rarely stands entirely on its own. These are the jobs most often booked alongside it, all under residential locksmith services.
- Lock Rekeying — Change who can open your doors without replacing the hardware - the first thing to do after a move.
- Lock Replacement — Worn, outdated or compromised locks swapped for solid modern hardware.
- Lock Repair — Sticking, loose or misaligned locks diagnosed and fixed instead of needlessly replaced.
- Smart Lock Installation — Keypad and app-controlled smart locks installed, aligned and set up so they work every single time.
- Door Lock Repair — Door hardware realigned and repaired so the latch catches smoothly again instead of being shouldered shut.
- Mailbox Lock Replacement — New mailbox locks and keys, including cluster-box units in condos and apartment communities.
- High-Security Lock Installation — Pick-resistant, drill-resistant locks with restricted keyways, so nobody copies your key at a kiosk.