Deadbolt Installation & Repair in Illinois and Wisconsin

A spring latch holds a door shut, but a deadbolt is what stops it being pushed open. Deadbolt installation and repair covers fitting a rated bolt, boring a door that never had one, reinforcing the strike, and correcting bolts that no longer align because the door or frame has moved.

A spring latch holds a door shut. A deadbolt is what stops it being pushed open. If your front door relies on a handle-set latch alone, or on a deadbolt with a short throw and no strike reinforcement, the door is considerably easier to defeat than it looks.

We install and repair deadbolts across Northern Illinois and Southern Wisconsin, from single-cylinder units on a house to heavy-duty commercial bolts on a steel frame.

Deadbolt grades: what the rating actually buys you
Grade	Cycle rating	Where it belongs	Realistic lifespan
Grade 3	About 100,000 cycles	Interior or low-use doors. Builder default.	3 to 7 years on an exterior door
Grade 2	About 250,000 cycles	Exterior residential doors	10 to 15 years
Grade 1	About 1,000,000 cycles	Commercial, or high-use residential	15 to 25 years and beyond

Grade matters more than brand

We fit ANSI/BHMA Grade 1 or Grade 2 deadbolts on exterior doors. Those grades are tested for bolt strength, cylinder pull-out and cycle life, which is the rating that separates hardware lasting a decade from hardware failing in year three.

Bolt throw should be a full inch into a steel strike, and the strike should be anchored into the frame with screws long enough to reach the structural stud behind it. That last detail is where most residential doors are weakest, and it costs very little to correct at the same time as the lock.

Related:Wikipedia: deadbolt

The four things that decide whether a deadbolt holds

Two deadbolts can look identical on the shelf and differ enormously in how they fail. Four variables, in order of how often they are the real problem, decide the outcome.

Bolt throw and strike depth. A full one-inch throw engaging a steel strike is the standard. A half-inch bolt that only reaches the jamb surface offers very little.
How the strike is anchored. The strike should be fixed with screws long enough to reach the structural framing behind the jamb, typically three inches. This single change is the highest-value improvement available on most residential doors.
Cylinder security. Standard pin-tumbler cylinders can be picked and bumped. Security pins, a sidebar mechanism or a restricted keyway raise that bar. None of it helps if the door is hollow.
Door and frame construction. A solid core or reinforced door with a sound frame is the foundation. Hardware is only as strong as what it is fixed to.

Single or double cylinder, and the safety trap

Double-cylinder deadbolts remove the inside thumb-turn, on the theory that a burglar cannot reach through and open the door. They also mean you need a key to leave, in a fire, in smoke, in the dark, with children or visitors who do not know where it is kept.

The honest position: single-cylinder is the correct default for a home. Building codes in Illinois restrict double-cylinder units near egress doors for exactly this reason, and a keyed exit has killed people. If a door has glass within reach of the thumb-turn, the better answers are laminated glass, a security film, or repositioning the lock, not removing your ability to get out.

Repair before replace: what is usually wrong

Most deadbolt faults are alignment or fixing problems rather than failed locks, and they are repairable. We replace only when the cylinder or bolt is genuinely damaged, and we will show you the worn part rather than just asserting it.

Bolt no longer aligns. The house has settled or the door has swelled. Fix the strike position, not the lock.
Key turns but the bolt will not throw. Usually a bent or dry bolt, or debris in the mortise. Serviceable.
Key is stiff or gritty. The wrong lubricant has collected grit. Clean it out; do not add more oil.
Plug spins freely. The cylinder has failed internally. Replace it.
Loose in the door. Fixings have pulled out of stripped holes. Usually can be re-anchored.

Fitting a deadbolt to a door without one

This is a routine job. It requires boring a 2-1/8 inch hole through the door face for the cylinder and a 1 inch hole into the edge for the bolt, plus a mortise in the jamb for the strike.

Two things decide whether it goes well: whether the door is thick enough for the cylinder body, and whether the stile, the vertical edge of the door, is wide enough that the bore does not break out through the glass or a panel. We check both before drilling.

Repairing the failures we see repeatedly

Beyond alignment, three failures come up again and again on exterior doors. Bolts that no longer line up because the house has settled. Cylinders that have been turned with the wrong key until the pins are damaged. And deadbolts installed with the bore out of square, so the bolt grinds every time it is thrown.

The last one is a defect from a previous installation rather than wear, and it is worth correcting while the door is open rather than waiting for the bolt to seize.

What we test before leaving a deadbolt job

Every installation is tested through at least a full cycle of open, close and lock before we leave. We will not sell you a deadbolt you do not need, and we will not fit a cheap one where it will not last. If your door frame is the real weakness we will say so and quote the reinforcement rather than a new lock that solves nothing.

Service areas for deadbolt installation & repair

We cover every town on our list across Northern Illinois and Southern Wisconsin. These are a few of them.

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Frequently asked questions

What is the difference between a Grade 1, 2 and 3 deadbolt?

They are ANSI/BHMA durability and strength ratings. Grade 3 is builder-grade and the minimum for residential use, Grade 2 is a solid residential upgrade, and Grade 1 is commercial-grade and rated for far more cycles and higher forced-entry loads. We fit Grade 1 or 2 on exterior doors as standard.

Do I need a single or double-cylinder deadbolt?

Single-cylinder is the right default for a home, because it can be opened from inside without a key, which matters in a fire. Double-cylinder removes the inside thumb-turn but requires a key to leave, and Illinois building codes restrict it near egress doors. We will advise against double-cylinder where it creates a safety problem.

Can you repair a deadbolt rather than replace it?

Often yes. Misalignment, a worn strike, a loose cylinder or a bent bolt can usually be corrected. We replace only when the cylinder or bolt is genuinely damaged, and we will show you the worn part rather than just asserting it.

Can a deadbolt be fitted to a door that never had one?

Yes, and it is a routine job. It requires boring a 2-1/8 inch hole through the door face for the cylinder and a 1 inch hole into the edge for the bolt, plus a mortise in the jamb for the strike. We check that the door is thick enough and that the edge is wide enough not to break out through glass before drilling.

Deadbolt Installation & Repair in Northern Illinois and Southern Wisconsin