The grade stamped on a deadbolt box is the closest thing the lock world has to a crash-test rating. Most homeowners never read it, and the builder picks the cheapest option that passes. Here is what those numbers actually buy you.
The grades come from a standard run by the Builders Hardware Manufacturers Association under the ANSI banner. A deadbolt earns its grade by surviving a fixed battery of tests, not by a marketing claim. Three things get measured: how many open-close cycles the bolt handles, how many hammer strikes it takes, and how much pulling force the bolt resists before it fails.
Grade 1 is the top tier. It survives the most cycles, the heaviest strikes, and the strongest pull, which is why it shows up on offices, schools, and apartment entries that get hammered daily. Grade 2 clears a lower but still serious bar built for residential use. Grade 3 is the entry level. It passes the minimum and nothing more, which is why it is the default on new construction where the builder is counting pennies per door.
One honest caveat: the grade tests the lock itself, in a test rig, mounted perfectly. It says nothing about your door, your jamb, or the two short screws holding the strike plate. We will come back to that, because it is where most Denver break-ins actually succeed.
Grade 3 is the deadbolt you very likely have if the lock came with a newer house and nobody upgraded it. It works fine for years of normal turning. The problem shows up under stress: the bolt is thinner, the internal pins wear faster, and the housing flexes when someone leans on the door. In our experience across the metro, the new stucco-and-frame tracts pushing out toward Aurora and the Arvada edges ship with Grade 3 by default.
Here is the part that bites homeowners. A Grade 3 bolt paired with the half-inch screws in a standard strike plate is the easiest forced entry there is. The bolt does not break. The jamb splits. We see it after attempted break-ins all the time, a cracked frame and an intact, useless deadbolt lying in the splinters. Upgrading to a graded bolt without fixing the strike is half a job.
For most Denver homes, a quality Grade 2 deadbolt plus a reinforced strike plate is the smartest money. Grade 2 clears the residential security bar, costs less than Grade 1, and the upgrade you actually feel comes from the strike reinforcement, not the bolt tier. Pair it with our residential locksmith deadbolt work and you have covered the realistic threats.
Go Grade 1 on the doors that earn it. An alley-facing or side door nobody can see from the street. A rental you cannot keep an eye on. A door that already took a kick and needs to deter the next attempt. Commercial entries should be Grade 1 as a baseline, because the cycle count alone justifies it. We would rather put a Grade 1 on your two vulnerable doors and a solid Grade 2 on the rest than sell you Grade 1 everywhere.
| Grade | Best fit | What you get |
|---|---|---|
| Grade 1 | Commercial, vulnerable side doors, rentals | Highest cycle, strike, and pull resistance. |
| Grade 2 | Most residential front and back doors | Strong residential security at lower cost. |
| Grade 3 | Low-traffic interior or as a temporary lock | Builder minimum; upgrade for security. |
Most forced entries in Denver homes fail at the jamb, not the cylinder. An intruder kicks, the short strike-plate screws tear out of soft pine trim, and the door swings open with the deadbolt still locked. The grade of the bolt never entered the equation. That is why we treat the strike plate as the real security upgrade and the deadbolt grade as the supporting cast.
The fix is cheap and fast. A heavy reinforced strike plate, three-inch screws driven past the trim into the wall framing, and where the door has been hit before, a wrap-around reinforcer that spreads the load. Do that on a Grade 2 bolt and you outperform a Grade 1 bolt mounted with the factory screws. We carry the plates on the truck and add them during a deadbolt install or a break-in repair visit.
A deadbolt install in Denver usually runs $100 to $250 installed with the hardware included, and the grade you choose moves the number within that range. Adding a reinforced strike plate is a small extra. Older doors near the foothills sometimes need prep before a new lock seats correctly, which we flag before we start so the quote on the phone matches the invoice.
What drives the number? The grade and brand of the lock, whether your door is already bored for a deadbolt, and the shape of the existing jamb. A new bore on a solid-core door takes longer than swapping a bolt into an existing hole. We quote the real figure up front, and if your door needs framing work first, we tell you rather than mounting a strong lock onto weak wood.
The numbers come from the BHMA/ANSI grading standard. Grade 1 survives more cycles, more strikes, and more pulling force than Grade 2, which in turn beats the Grade 3 builder hardware on most new Denver doors. Grade 1 is commercial-tier security on a home; Grade 2 is the practical sweet spot for most houses.
For most Denver homes a quality Grade 2 deadbolt plus a reinforced strike plate is the better value. Grade 1 makes sense on a vulnerable side or alley door, a rental you cannot watch, or any door that already took a hit. The lock matters less than the strike screws when someone kicks a door.
Check the box if you still have it, or look for a small stamp on the lock body. If the deadbolt came with the house and feels light or wobbly, it is usually a Grade 3 builder unit. When you cannot tell, we can identify it on a service call and tell you honestly whether it is worth keeping.
Not by itself. Most forced entries fail at the strike plate and the door jamb, not the lock cylinder. A Grade 1 bolt anchored with two short screws into soft pine still gives way. The fix is a reinforced strike plate with three-inch screws into the framing, paired with a solid Grade 1 or Grade 2 bolt.
A deadbolt install in Denver usually runs $100 to $250 installed with the hardware included, depending on the grade and whether the door needs prep. Adding a reinforced strike plate is a small add-on. We quote the figure before we start, and we tell you when your existing door needs work first.
We match the grade to the door, reinforce the strike plate that actually stops a kick-in, and quote the figure before we touch anything. Insured, local, and clear on what your specific door needs.
Last updated: May 28, 2026.
