If you’re a homeowner or landlord in Brampton and someone has told you to “rekey your locks,” you probably want to know what that actually means, what it costs, and whether you’re about to spend money you don’t need to spend.

I’m not a licensed locksmith. I’m a residential handyman who has been installing, replacing, adjusting, and troubleshooting door locks for homeowners across Brampton and the surrounding GTA neighbourhoods for many years. I work on front entries, side and garage entries, and interior privacy locks. I choose appropriate hardware, fit it correctly, align latches and deadbolts, and make sure the door operates smoothly and securely.

I’ve done enough rekeying jobs that I’ve seen the pattern: homeowners and landlords make the same assumptions over and over, and those assumptions lead to unnecessary spending, frustrated DIY attempts, or half-finished security situations. This post is me telling you what actually happens on the door, what I see going wrong, and how to make a smart decision before you spend a cent.

What Rekeying Actually Looks Like on Your Door

The short definition you’ll find everywhere is that rekeying changes the internal pins in a lock cylinder so the old key no longer works. That’s true. But most articles stop there, and that’s where the useful information starts.

Here’s what’s physically happening:

• The lock cylinder is removed from the door (or, on some models, the core is pulled out while the escutcheons stay on).
• The cylinder is opened using a follower tool, which holds the plug in place so the spring-loaded pins don’t scatter.
• The existing key pins are removed and replaced with a new set of pins of different lengths.
• The cylinder is reassembled and cut to match a new key.
• The cylinder goes back into the lock, the lock goes back into the door, and you test the new key.

That last step matters more than people expect. The bolt needs to throw smoothly into the strike, the door needs to close without dragging, and the latch needs to engage cleanly. If the door has warped, the frame has settled, or a previous install was sloppy, the lock can feel “wrong” even though the rekey itself was done perfectly.

The whole process on a standard residential deadbolt or knob lock takes a professional anywhere from ten to twenty minutes per lock, depending on the condition of the hardware and the door.

The Biggest Myth I Hear: “Rekeying Is a Security Downgrade”

This is the one I wish more people understood, so I’m putting it up front.

The most common misconception I see in Brampton is that rekeying is a cheaper, lower-security shortcut compared to buying new locks. Homeowners and landlords treat it like “good enough for now,” when in reality, for most residential situations, rekeying provides the same level of security as brand-new hardware.

Why people think rekeying is less secure:

• Locksmith marketing and big-box store displays push new locks hard. Ads emphasise “upgrade your security” with shiny new deadbolts and smart locks.
• Store associates often suggest replacement first because it’s a bigger sale.
• Rekeying is presented as a quick, low-cost service, which makes people assume it’s inferior.

That combination leads a lot of Brampton homeowners to believe that if they’re not buying new locks, they’re compromising on security. They’re not.

Here’s the reality from a practical standpoint:

• Security is determined by the grade and design of the lock, not whether it was rekeyed or replaced.
• If your existing lock is a decent residential deadbolt or knob/lever set, rekeying it does not weaken its resistance to forced entry, picking, or bumping compared to putting on a brand-new lock of the same model.
• The external hardware stays the same. The pins change. The security rating doesn’t.

The real security questions should be:

• Is the lock itself a reputable residential grade (for example, Grade 1 or Grade 2)?
• Is the door, frame, and strike plate in good condition and properly aligned?
• Is the lock installed correctly so the bolt fully extends and engages?

If the answer to those is yes, rekeying gives you the same practical security as a new lock of the same type, often at a fraction of the cost.

The line I try to get across to homeowners and landlords before they spend extra on hardware they don’t actually need: rekeying is a key-control solution, not a hardware downgrade.

A Real Job: The Landlord Who Was About to Spend Hundreds on Locks He Didn’t Need

One rekeying job that stands out happened with a rental duplex near Queen and Main in Brampton. The landlord had just finished a tenant turnover and was convinced he needed to buy all new exterior locks for both units. He’d already priced out a set of deadbolts and knob locks at a big-box store and was ready to spend a few hundred dollars on hardware, plus pay someone to install everything.

His assumption was simple: “New tenant, new locks.” On the surface, that sounds reasonable, especially after a tenant moved out on bad terms. But when I looked at the doors, the existing deadbolts and knobs were:

• Less than two years old
• Still in good mechanical condition
• From a decent brand, not the cheapest builder-grade hardware

He didn’t need new locks. He needed them rekeyed so the old tenant’s keys would no longer work.

Here’s what I did instead:

• Rekeyed both front-door deadbolts and knob locks to a single new key for each unit
• Tested each lock to make sure the latch and deadbolt threw smoothly into the strike
• Adjusted one strike plate that was slightly misaligned, which is a common issue in rental properties with a bit of settling

The total cost for rekeying and minor adjustments was a fraction of what he would’ve spent replacing all the hardware, and the doors kept their existing, matching finish.

His reaction was basically: “I had no idea rekeying was even an option. I thought it was either live with the old keys or buy all new locks.” He was surprised that rekeying gave him the same security benefit as new locks for that scenario, that he could keep the existing hardware and avoid mismatched finishes, and that the job was faster and cheaper than a full replacement.

This is a pattern I see a lot in Brampton rentals: owners assume replacement is the only safe option after a tenant leaves, when in many cases a proper rekey plus a quick alignment check solves the problem without the extra expense.

Rekeying vs. Keying-Alike: The Distinction Almost Nobody Explains

This is probably the biggest source of confusion I see in Canadian lock content, and it causes real problems on job days.

Rekeying means changing a lock so old keys no longer work. Each lock can still have its own key. If you rekey three doors, you walk away with three different keys.

Keying-alike means configuring multiple locks so they all work on one key. You can key-alike existing locks, new locks, or a mix of both.

Here’s what that looks like in practice:

• “Rekey my house” does not automatically mean “one key for everything.” That’s a separate request.
• You can rekey without keying-alike. Each door gets its own new key.
• You can key-alike locks that were just rekeyed, locks that were already there, or a combination.
• It has to be specified upfront. If you don’t tell the person doing the work what key configuration you want, you might get three doors with three separate keys and be surprised.

I’ve had homeowners walk up to the door, try one key on every exterior entry, and ask me why the back door doesn’t match. I explained keying-alike, and they said, “I thought that was what rekeying was.” It’s not. It’s a related but distinct service, and it’s sometimes a separate charge.

If you want all your exterior doors to work on a single key, say that specifically when you book the job.

DIY Rekeying Kits: Where They Work and Where They Fall Apart

You can pick up a rekeying kit at Home Depot, Canadian Tire, or similar stores for around $20 to $40. They include pins, springs, a follower tool, and test keys. They’re not inherently bad. But I’ve been called in enough times after a homeowner tried one that I can tell you exactly where they go wrong.

Where a DIY kit can make sense:

• You’re comfortable working with small parts and following detailed instructions
• You’re rekeying a single, standard residential lock (a common Kwikset or Schlage-style cylinder)
• The lock is in good condition and you’ve successfully removed and reinstalled it before
• You have time to troubleshoot if something doesn’t go smoothly and you’re not in a rush to get the door secured that night

In those conditions, a handy homeowner can sometimes rekey one or two locks without disaster. But that’s the best-case scenario, not the average one.

Here’s how I’ve seen DIY rekeying go wrong:

Lost springs and pins everywhere. The most common failure. The cylinder is opened over a hard floor or not contained properly, and tiny springs and pins fly off in different directions. One or more pin chambers end up empty or mismatched. The key turns partially or not at all. The lock is now non-functional until someone rebuilds or replaces it. By the time I arrive, the homeowner has spent an hour searching for lost parts and is left with a door they can’t reliably lock.

Wrong pin sizes or incorrect order. Even when no parts are lost, people mix up pin sizes, put them back in the wrong order, fail to seat pins fully, or reassemble the cylinder incorrectly so the plug won’t turn with any key. The lock might “sort of work” at first, then become sticky or seize entirely after a few uses. That’s when I get the call: “It was fine yesterday, now the key won’t turn.”

Damaged cylinders and stripped components. Some homeowners use the wrong tools, strip set screws, over-tighten components and crack the plug or housing, or force the key repeatedly and bend or break it inside the partially reassembled lock. At that point, rekeying is no longer the issue. The whole lock needs replacement, and sometimes the door prep needs repair too.

Security and key-control problems. Even when the lock technically works afterward, I’ve seen multiple keys created during the process with no clear record of who has what, incomplete rekeying where only the deadbolt is rekeyed but not the knob or lever, leaving old keys still functional on part of the door, and confusion between rekeying and keying-alike that leads to a mix of keys that don’t match across doors. That defeats the whole purpose of rekeying in the first place.

When I tell people to just call someone:

• It’s a rental property or new home where key control really matters
• There are multiple doors to rekey
• The existing locks are older, worn, or already a bit sticky
• You aren’t confident taking a lock apart and putting it back together cleanly
• Time is a factor (tenant moving out, closing day, security concern after lost keys)

In those situations, the cost of a professional rekey is small compared to the risk of ending up with a half-working lock, lost parts, or compromised security.

What to Do Before You Book a Rekey Appointment

Almost no “what is rekeying” article tells you how to prepare for the job. This is a gap I see constantly, and it leads to avoidable headaches and extra visits.

Here’s what I want homeowners and landlords to do before the person arrives at the door:

• Gather all existing keys. Front door, side door, garage, spares in the kitchen drawer, the one in the shed. Bring them all. If you don’t, you might end up in a situation where we’ve rekeyed the front and side doors and you find an old spare in the garage two weeks later that still works on the old configuration.
• Decide in advance whether you want all exterior doors on one key or separate keys. That’s the rekeying vs. keying-alike question. Don’t leave it to a guess on the day.
• Test each lock beforehand and note which ones are sticky, loose, hard to turn, or make a grinding sound. This tells the person doing the work which locks might need a replacement instead of a rekey, and which might have an alignment issue to fix while they’re already there.
• Be clear about which doors matter most. “Rekey front and side, leave the garage as-is” is a perfectly fine instruction. Don’t assume “rekey the house” covers every single entry point unless that’s what you actually want.
• Make sure the door closes properly. If it’s dragging, sticking, or not latching, mention it. A perfectly rekeyed deadbolt won’t help if the door is warped or the strike is misaligned, and it’s easier to fix the strike plate while the lock is already off the door than to come back for a second visit.

That checklist alone prevents most of the “we thought the back door was included” or “it was working yesterday” conversations that end up costing extra time and money.

When Rekeying Is Enough and When Replacement Is the Better Call

Rekeying is the right move when the hardware is in good mechanical condition and your goal is key control. You’ve lost keys, a tenant has moved out, you’ve just bought a home, or you want a single key for all your exterior doors. The lock works, the bolt throws cleanly, the key turns smoothly. Rekey it.

Replacement is the better call when:

• The lock is worn, sticky, or grinding and won’t turn smoothly even before you get to the pins
• The hardware is old, corroded, or from a low-grade builder line that you want to upgrade
• You’re changing the door or the frame and the existing bore holes don’t line up with new hardware
• You’re moving to a smart lock or keypad entry, which means the physical cylinder is being replaced regardless
• The strike plate area is damaged and needs new hardware to match

The honest test I use: if the lock is doing its job mechanically and your only problem is that someone else has a key, rekey it. If the lock itself is the problem, replace it.

The Door Isn’t Just a Place the Lock Lives

This is the piece that most “what is rekeying” content skips entirely, and it’s the piece that separates a handyman who’s actually opened the door from someone who’s just read about it.

A perfectly rekeyed deadbolt won’t help if the door is warped or the strike is misaligned. In real Brampton homes, I see this constantly:

• Doors that have warped from seasonal humidity swings, especially on older homes with less climate control
• Frames that have settled slightly, pulling the strike plate out of alignment
• Previous installs where the strike was placed by guesswork instead of by the bolt’s actual throw path
• Weather stripping that’s compressed and causing the door to bind on the bottom corner

If the door doesn’t close cleanly, the bolt won’t engage fully, and the lock feels “loose” or “off” even after a perfect rekey. The problem isn’t the pins. The problem is the door.

When I’m rekeying, I’m checking the door at the same time. Is the strike plate positioned where the bolt actually lands? Is the door closing with a clean, solid click? Is there play in the hinge that’s letting the door sag? These are quick fixes, but they’re the difference between a rekey that works for a week and a rekey that works for years.

The Bottom Line

If you’re in Brampton and you’re trying to decide what to do about your locks, here’s the short version from someone who does this work every week:

• Rekeying is a key-control solution, not a hardware downgrade. If your locks are in good shape, rekeying gives you the same security as new hardware at a fraction of the cost.
• Rekeying is not the same as keying-alike. Decide upfront whether you want one key for all doors or separate keys.
• DIY kits can work in very narrow situations, but for anything security-sensitive, multi-door, or time-critical, the risk of a half-working lock is not worth saving twenty dollars.
• Prep before the appointment. Gather your keys, test your locks, decide your key strategy, and check that your doors close properly.
• The door matters as much as the lock. A well-aligned door with a solid strike plate often does more for your security than the brand of deadbolt in it.

That’s what rekeying actually looks like on the other side of the door. Not a sales pitch. Not an emergency. Just a practical, specific tool for a specific problem, done properly on a door that’s set up to let it work.