Grade 1, 2 and 3 are durability and security ratings set by ANSI/BHMA, the industry body that tests locks before they're sold. Grade 1 is the toughest and usually shows up on commercial doors or high-security homes. Grade 3 is what most builders put on new houses and townhomes because it's cheap and meets code, nothing more. If you're not sure what's on your door right now, look at the edge of the deadbolt where it meets the door face, most brands stamp the grade number right on the faceplate or bolt.
What does Grade 1, 2 and 3 actually mean?
These numbers come from independent lab testing, not marketing copy. A lock gets a grade by surviving a set number of strike impacts, a cycle test (locking and unlocking thousands of times), and a torque test on the cylinder. The grade tells you how much force and wear the lock is built to take before it fails, not how it looks or what brand name is on the box.
A lot of homeowners assume a shiny brushed-nickel deadbolt from a hardware store is automatically secure. Some are Grade 2, plenty are Grade 3. The finish tells you nothing about what's inside.
How are deadbolts actually tested to earn these grades?
Grade 1 deadbolts are tested to survive 10 strikes at roughly 75 foot-pounds of force (think a heavy kick or a hammer blow) without the bolt failing, plus around 250,000 open-close cycles. Grade 2 locks handle about 5 strikes at the same force and around 150,000 cycles. Grade 3 only needs to survive 2 strikes and a lower cycle count, often 100,000 or less.
Bolt throw (how far the bolt extends into the door frame) usually differs too. Grade 1 deadbolts typically throw a full 1 inch of hardened steel. Grade 3 builder-grade bolts often throw 5/8 inch or less, and the bolt itself may be softer metal that's easier to force or saw through. That difference matters more on an exterior door than people expect.
Which grade do you actually need for your door?
Not every door in your house needs the same grade. Front and back exterior doors facing the street or an alley deserve the strongest lock you're willing to pay for. Interior doors, garden suites, or a door that already has a solid metal security gate behind it can usually get away with less.
- Front door, street-facing. Grade 1 or Grade 2 makes sense here. This is the door that gets tested by anyone trying the handle on a walk down the block.
- Back door or side door. Grade 2 minimum. Back doors in Vancouver's older character homes often get less attention but are a common entry point because they're hidden from the street.
- Rental suite or laneway house entrance. Grade 2, and check the strike plate too, since a Grade 1 deadbolt still fails if it's anchored into a weak frame.
- Interior doors (bedroom, office). Grade 3 is fine. These don't face outside force, so there's no reason to pay commercial pricing.
If you're weighing your options for a full lock upgrade rather than just the grade, our post on why your strike plate matters more than your lock covers the other half of this equation. A Grade 1 deadbolt screwed into a thin, short strike plate with 3/4 inch screws is still a weak door.
What you're actually paying for at each grade
As a typical range, not a quote: Grade 3 deadbolts run about $15 to $40 CAD at most hardware stores. Grade 2 sits around $40 to $90 CAD. Grade 1 residential and light-commercial deadbolts run roughly $90 to $180 CAD, sometimes more for solid brass construction or smart lock versions with Grade 1 hardware underneath.
The price jump usually buys you hardened steel bolts and pins instead of pot metal, a longer bolt throw, better cylinder guard rings that resist drilling, and tighter manufacturing tolerances so the lock doesn't develop play over time. On the coast, that build quality also holds up better against salt air and damp winters, cheaper internals corrode and stiffen faster here than in a dry climate.
How to check what grade your current deadbolt is
Look at the faceplate (the metal plate on the door edge where the bolt extends) and the strike plate in the frame. Many manufacturers stamp "Grade 1," "Grade 2," or "ANSI Grade 3" directly on the metal, sometimes small, near the screw holes. If there's no stamp, check the packaging if you still have it, or the model number on the manufacturer's website. No stamp and no model match usually means an older or no-name lock, which is worth replacing on principle if it's on an exterior door.
While you're checking, test the deadbolt for play: grab the knob or thumbturn and wiggle it side to side. Noticeable looseness, even on a higher grade lock, usually means worn internals or a door that's shifted, not a grading problem. That's a separate issue covered in our post on a door lock sticking or not turning.
Grade alone won't save you if the installation is wrong
A Grade 1 deadbolt installed with short screws, a misaligned strike plate, or a hollow-core door behind it performs like a much cheaper lock. Grade only means something when the door, frame, and strike plate can actually hold up their end. If you're upgrading, it's worth having someone check backset measurement (usually 2-3/8" or 2-3/4" on North American doors), door thickness, and frame condition at the same time, not just swap in a higher number and assume you're covered.
If your exterior doors still have whatever the builder put in, or you're not sure what grade you've got, it's worth getting it checked rather than guessing. Have your door thickness and the make of your current lock handy if you know it, and reach out through our about page to get a straight answer on what fits your door before you buy anything.
Frequently asked questions
Is a Grade 1 deadbolt worth it for a regular house?
For a street-facing front door, yes, the price difference over Grade 2 is usually $30 to $60 CAD and buys a noticeably tougher bolt and cylinder. For interior or low-risk doors, Grade 2 or 3 is enough.
Can I upgrade just the deadbolt without changing the whole door?
In most cases, yes, as long as the backset and bolt hole line up with the new lock's specs. The bigger factor is whether your existing strike plate and frame can handle a Grade 1 bolt's extra throw and force.
Do smart locks come in different grades too?
Many do, the smart or keypad features sit on top of a mechanical deadbolt that's still graded 1, 2 or 3 underneath. Check the spec sheet or box for the ANSI/BHMA grade separately from the smart features, since marketing often highlights the tech and buries the grade.