You've just moved into your new home. Or maybe you've lost a key, had a tenant move out, or just want better security. The question is the same: should you rekey your existing locks or replace them entirely?
It's one of the most common questions we get at H&B Security Centre, and the answer depends on your situation. Here's a straightforward comparison to help you decide.
What Is Lock Rekeying?
Rekeying is the process of changing a lock's internal pin configuration so that old keys no longer work, while the existing lock hardware stays in place. A locksmith removes the lock cylinder, swaps the pin tumblers for a new set, and cuts you fresh keys.
The result: Your old keys become useless, and only the new keys will operate the lock. The lock looks exactly the same from the outside.
Cost: Typically $15-25 per lock cylinder, plus a service call fee.
Time: Usually 10-15 minutes per lock. A whole-house rekey can be done in under an hour.
What Is Lock Replacement?
Lock replacement means removing the entire lock hardware — the knob, deadbolt, latch, and strike plate — and installing a brand-new unit. This gives you entirely new hardware along with new keys.
The result: Everything is new. You get fresh hardware, updated security features, and a new key system.
Cost: Varies widely depending on the lock grade. A basic residential deadbolt runs $40-80 for hardware, plus installation. High-security locks like Medeco cost $150-300+ per lock, plus installation.
Time: 20-30 minutes per lock for a straightforward swap. Custom mortise locks or smart lock installations may take longer.
Side-by-Side Comparison
| Factor | Rekeying | Replacement |
|---|---|---|
| Cost per lock | $15-25 + service call | $40-300+ hardware + installation |
| Time per lock | 10-15 minutes | 20-30 minutes |
| Security level | Same as existing hardware | Up to you — choose any grade |
| Old keys work? | No — rendered useless | No — entirely new system |
| Hardware changed? | No — same lock, new pins | Yes — new lock body and mechanics |
| Appearance | Unchanged | New hardware, new finish options |
| Damage repair | N/A — no structural change | Can fix misaligned strikes, damaged frames |
When to Rekey
Rekeying is the right choice when:
- You've just moved in. This is the #1 reason. You have no idea how many copies of your house keys are floating around. Rekeying is fast, affordable, and immediately secures your home.
- You've lost a key. If a key is missing and you're not sure who might have it, rekeying puts you back in control.
- A tenant has moved out. For landlords, rekeying between tenants is standard practice — and often a legal requirement.
- You want all locks on one key. If your home has different keys for different doors, rekeying can unify them so one key opens everything.
- Budget is a priority. Rekeying gives you the security of new keys at a fraction of the replacement cost.
For new homeowners in Kitchener-Waterloo, we almost always recommend rekeying as the first step. It's the fastest, most cost-effective way to secure a new home.
When to Replace
Lock replacement makes sense when:
- The lock is worn or damaged. A loose deadbolt, sticky latch, or rusted exterior hardware won't protect you properly — and rekeying won't fix it.
- You want to upgrade security. Moving from a basic Grade 3 deadbolt to a Grade 1 high-security lock is a meaningful security improvement. Rekeying can't change the lock's built-in security rating.
- You're installing smart locks. Going keyless? That's a full replacement. Smart locks from Schlage offer app control, keypads, and auto-locking — none of which you can get through rekeying.
- The hardware is outdated. If your locks are 20+ years old, they may not meet current security standards. Modern locks have better anti-pick, anti-bump, and anti-drill protection built in.
- You've had a break-in. After a forced entry, the lock and door frame are often compromised. Replacement ensures everything is solid again.
Our Recommendation for New Homeowners
Here's what we tell every new homeowner who calls us:
- Rekey all exterior locks immediately. This takes under an hour and costs a fraction of replacement. You're instantly secure against any old keys that might be out there.
- Assess your lock quality. While we're rekeying, we'll check the grade and condition of your hardware at no extra charge. If we spot a weak deadbolt or a misaligned strike plate, we'll let you know.
- Upgrade where it matters most. Most homeowners choose to invest in one or two high-security deadbolts (front door, back door) while keeping the rest of the house on rekeyed standard locks. This balances cost and protection.
It's a practical, budget-friendly approach that doesn't sacrifice security.
Ready to Secure Your Home?
Whether you need a quick whole-house rekey or a full lock upgrade, H&B Security Centre is here to help. We've been serving Kitchener-Waterloo homeowners since 1980 with transparent pricing, experienced professionals, and no hidden fees.
Call 519-578-6268 or book a free security assessment online. We'll recommend the right approach for your doors and your budget.