How Much Does It Cost to Replace a Door Lock?
The cost to replace a door lock splits into two numbers that have nothing to do with each other: what the hardware costs, and what the labor costs. Most price guides blur them together, which is why the ranges you find online are useless. Here is how we quote it on real Charlotte and Lake Norman jobs.
What actually drives the price?
Four things, in rough order of impact:
- Hardware grade. A builder-grade knob lock and a Grade 1 deadbolt are both "a door lock" and differ by a factor of ten.
- Door prep. If your door already has a standard bore, installation is fast. If it does not, someone has to cut one.
- Door count. The drive out is a fixed cost. Four doors on one visit is much cheaper per door than four separate visits.
- Whether you actually need replacement at all. More on that below, because it is where most people overspend.
How much is the lock itself?
Retail hardware prices, which you can verify at any big box store:
| Tier | Typical retail | What you get |
|---|---|---|
| Builder-grade knob or deadbolt | $20 to $30 | Grade 3. Interior doors only, not an exterior door |
| Schlage B-series (B60, B62) | $50 to $80 | Grade 2, the sweet spot for most homes |
| Yale 250 / 360 series | $60 to $100 | Grade 2, smart versions available |
| Smart deadbolt (Schlage Encode, Yale Assure 2) | $200 to $280 | Grade 2 plus codes and app control |
| High security (Medeco, Mul-T-Lock) | $200 to $300 | Grade 1, restricted keyways |
The grades come from ANSI/BHMA, which is a real testing standard rather than marketing: BHMA publishes the certification criteria and Schlage lists the grade for each model. If a listing does not state a grade, assume Grade 3.
Our honest read after years of these calls: for a typical Charlotte or Lake Norman house, a Grade 2 deadbolt in the $50 to $80 range on every exterior door beats one expensive lock on the front and builder-grade everywhere else. We go deeper on brands in the deadbolt buying guide.
What does installation add?
Labor depends almost entirely on whether the door is already prepped.
Standard prepped door (existing bore for a deadbolt, correct backset): swapping the hardware takes 15 to 30 minutes per door. This is the common case in anything built in the last few decades.
Non-prepped or non-standard door: an older mortise setup, a decorative slab, a steel commercial door, or a door with no deadbolt bore at all. Now someone is cutting and chiseling, and the job runs longer. Historic Davidson and mill-era Cramerton homes land here often.
Doors that have shifted: if the deadbolt has been sticking for a year, the frame or the strike plate may be the actual problem. New hardware on a misaligned door will stick too. We check alignment before quoting so you are not paying to install a lock that will annoy you the same way the old one did.
We quote the exact total before dispatching, hardware and labor together, so there is no on-site surprise. Current rates live on the pricing page, and the instant quote calculator will get you a number in about a minute.
Should you replace the lock or just change the key?
This is where the money is, and the answer surprises people.
If your goal is "the old keys should stop working" (you moved in, a key went missing, a roommate left, a contractor had access), you usually do not need new locks at all. Re-pinning the existing cylinder achieves exactly the same security result and keeps your hardware. The old key becomes a piece of scrap metal either way.
Replacement is the right call when:
- the lock is physically failing, sticky, or worn out
- it is Grade 3 on an exterior door and you want a real upgrade
- someone tried to force it, so the internals are compromised
- you want smart features the current hardware cannot provide
Replacement is the wrong call when the hardware is fine and you just inherited an unknown number of key copies. We walk through the decision in detail in rekey vs replace, including the cases where we tell people not to buy anything.
When is replacing the only real option?
Three situations where re-keying genuinely will not help:
Forced entry damage. If someone pried, drilled, or kicked the door, the cylinder and often the strike area are done. Re-pinning a damaged cylinder gives you a lock that fails at the same weak point.
Worn internals. A lock that has needed a jiggle to turn for the past two years is telling you the pins and springs are fatigued. New pins in a worn cylinder buys you months, not years.
Mismatched keyways across the house. If your doors carry three different brands with incompatible keyways, they cannot all be keyed alike without swapping some hardware. Sometimes replacing two locks is cheaper than living with three keys forever.
Does doing several doors at once save money?
Yes, and it is the single biggest lever you control. The trip is a fixed cost no matter how many doors we touch, so the second, third, and fourth door cost meaningfully less than the first. If you are replacing the front deadbolt, look at the back door and the garage entry in the same visit.
While we are there, all the new locks get keyed alike at no extra charge, so one key runs the whole house. Most people find that worth more than the hardware upgrade itself.
Getting a number for your door
Count your exterior keyed cylinders (front deadbolt, back or side door, garage entry, and any keyed outbuilding), then call (336) 790-2233. Tell us the door count and roughly how old the house is, and we quote the full total, hardware included, before anyone gets dispatched.
If you would rather not talk to anyone yet, the lock installation and replacement page lays out what the service covers, and the calculator will give you a range without a phone call.
