Keyed Alike Locks for Ontario Homes, Rentals and Businesses

What to know first in Ontario

A pin tumbler cylinder holds a column of small pins in each of five or six chambers. The right key lifts every column to the same height, creating a clean line, called the shear line, that lets the plug turn. Keyed alike locks are just cylinders whose pin stacks were built to the same cut depths, which locksmiths call a bitting. Kwikset's KW1 keyway offers seven cut depths; Schlage's SC1 offers ten with finer steps, so the two brands aren't interchangeable, and neither are two different keyways from the same maker. Matching locks means choosing a bitting, then replacing the key pins inside each plug with sizes that fit it. In Ontario we do that on site: the plug comes out over a plug follower so the springs and driver pins stay put, we measure and install the new key pins, and the plug goes back in. Whether you supply a working key to copy or let us choose a fresh bitting, the result is the same: one key, several locks, no new hardware.

Work included on a typical visit

• Matching existing locks to a key you already carry. Your front door key is the one you actually use, so we make it the pattern for the group. We read its cuts, then re-pin the back door, garage entry and any other same-keyway locks to match. Nothing is replaced, nothing is drilled, and the locks you've already paid for keep working.
• Duplexes, fourplexes and rental units. Rental buildings call for alike inside, different across. We key each unit's front, back and patio locks to that unit's own key, then give the common-area locks a separate key or a master for the owner. The result is a tidy key map that survives tenant turnover.
• Shops, offices and back-of-house doors. Small businesses usually want two tiers: staff keys that open the working doors, and an owner's key that opens everything. That is a master key system in miniature. We'll show you how adding a master level changes the security profile before you commit, then document the keying so future locks join cleanly.
• Adding a master key above a keyed alike group. Once groups exist, a master key is the next step. A master pin in each cylinder lets the owner's key open every group, while each group keeps its own key. It adds convenience for the owner and slightly more pick exposure than a plain cylinder, so we explain the trade before adding it.
• Key cutting, labeling and a key record. For anything high-value, ask about restricted keyways such as Schlage Primus or Medeco, where blanks are controlled and copies need authorization. Keyed alike works with them too. Control costs more per cylinder, but a copy can't be made at a kiosk, which suits rentals and shops with staff turnover.

What's different about Ontario

In apartment buildings around Ontario, keyed alike should stay within a single unit: entry door, balcony slider and storage cage on one key, never shared across units. Tenants need the landlord's consent before changing locks, and California Civil Code sections 1941.5 and 1941.6 require landlords to change locks within 24 hours of a tenant's written request in certain situations involving a protective order or similar documentation. We work with owners and managers to document everything.

Older Ontario homes carry a lifetime of replaced hardware: a mortise set at the front from the 1950s, a deadbolt added in the nineties, a brass knob at the back. Their keyways rarely match, so the first job is mapping them. We re-pin what shares a keyway to one bitting, swap a cylinder where an old mortise body can take a modern one, and replace the oddballs, keeping original handles wherever we can.

Tract homes in newer parts of Ontario often ship with a builder-grade set: a front deadbolt and handleset keyed alike, plus separate locks at the garage entry and slider. Construction crews and sales staff can hold copies of those keys. We re-pin every exterior door to one fresh combination soon after closing, which turns the builder's keyed alike locks into a set only you control, without touching the finishes.

Situations this covers

• A buyer closes on a newly built house near Ontario Mills. The front deadbolt and handleset share a key, the back slider and garage entry use two others, and the builder's crews carried copies of all three. We re-pin all four cylinders to one new combination, take the construction keys out of play, and cut the family three new keys, so nobody from the build crew can still walk in.
• The owner of a small retail shop in Ontario carries five keys for three doors and a cash room. We key the front, back and stockroom alike, put the office and cash room on a second key, and tag each set with a code. Opening shifts get one key, the owner keeps the second, and a former manager's stockroom key stops working.
• The owner of a duplex off Holt Boulevard inherits it with no key records. After we confirm her ownership with the deed, we inventory eight cylinders, key each unit's front and back doors to its own bitting, and pin the shared laundry closet to a master she holds. Each tenant gets keys for their half, and she gets a one-page map.
• During a remodel near Chaffey High School, a homeowner swaps the back-door lockset for a new one in a different finish. The front deadbolt and garage entry stay as they are. We key the new lock to match the old, pin the garage knob to the same key, and the family keeps carrying the single key they've used for years.

Step by step with Julian's Locksmith

1. Tell us what you have and what you want alike. Start with a walk around your property and count the keyholes, including the garage entry, side gate, shed and any detached unit. Write down the brand on each. Send photos if you can. A good list lets us quote accurately and avoids a second trip for hardware nobody mentioned.
2. Confirm you're authorized. At the door we ask to see photo ID and something tying you to the property: a utility bill, deed, lease or business license. Locks open homes and stock rooms, so we don't skip this. Tenants should have the landlord's written approval before we rekey anything.
3. Choose the grouping and the key. This is where the plan gets drawn. Family doors in one group, shared spaces in another, maybe a master key over both. We sketch it on paper, name the keys A, B and so on, and confirm the quote. Changing this later means re-pinning, so it's worth five minutes now.
4. Re-pin or match each cylinder. We remove each cylinder, release the plug over a plug follower so the springs stay put, and exchange the key pins for the new bitting. A cylinder takes only a few minutes. Locks that can't be re-pinned are flagged, and we replace them with same-brand hardware.
5. Test every key in every lock. Testing includes the dull checks: closing the door and throwing the deadbolt fully, confirming the knob latch retracts. Then we cycle every cut key through every cylinder one by one, so a poorly cut spare is found in the driveway, not on a rushed morning.
6. Label, cut spares and record the key. We cut the number of spares you want, tag each set with a neutral code and write the bitting and keyway on your key card. Keep the card somewhere safe and apart from your keys. With it, we or any licensed locksmith can match future locks to the group.

How we quote the job

• Brand and keyway compatibility. Locks that share a keyway can be re-pinned to a common key, which is the most economical route. Mixed brands can't, so one of them has to be replaced or swapped to a compatible cylinder. That cost, parts plus labor, is the main swing in a keyed alike quote, and we flag it up front.
• Key count and key type. Standard brass blanks are inexpensive and cut in minutes. Restricted keyways like Schlage Primus or Medeco cost more per key because blanks are controlled and copies require authorization. Think about how many people need keys, and how comfortable you are with copies being cut elsewhere.
• Hardware condition, access and timing. Locked-away rooms, sealed gates and missing keys add time. A shed whose padlock has no key must be opened first. Tell us on the call and we plan for it. A tidy list of locks, clear access and a contact on site make the job quick.

Every job gets a clear quote before any work starts. Call (951) 903-3193 with the details and we'll tell you what to expect for your situation in Ontario.

Practical tips before you call

• Never keep a spare under the doormat, the fake rock or the planter. Those are the first places a thief looks. A keyed alike set makes a hidden spare more dangerous, since it opens every door in the group. Leave it with a neighbor you trust or in a lockable key safe.
• Match padlock sets by model, not just by brand. Different models from the same maker often use different keyways, so two padlocks can carry the same name and still not share a key. Buy the set as sold, or ask us to match them before you commit to a pile of mismatched ones.
• Lubricate with dry graphite or a PTFE-based spray, not household oil. Oil collects the fine dust that Ontario summers deliver in quantity and gums up pins over time. A quick puff once a year keeps a keyed alike set turning smoothly, and every lock in the group wears at a similar rate.
• Ask what rekeying will do to old copies. If we match your locks to an existing key, every old duplicate still works. If we choose a new combination, those copies become useless. After a breakup, a move or a tenant change, the second option is almost always the right call.

What not to do

• Cutting spares anywhere that doesn't check the cuts. A copy made from a worn key inherits its wear, and one slightly off won't throw every lock in the group. Have spares cut from the code or a fresh original, and try each one in every lock.
• Putting everything on one key, including areas other people reach. A cleaner, contractor or tenant with access to the shed and the pool gate shouldn't also open your front door. Zone the property, then key alike inside each zone rather than across the whole place.
• Forgetting the forgotten locks. The garage entry, the side gate, the shed, the old mailbox and the pool-equipment closet are the ones that keep old keys alive. List every keyhole before the job, so none gets left behind on the previous combination.

Reaching Ontario

Ontario is about 25 miles from our San Bernardino base, roughly 33 minutes in light traffic via I-215 North to the I-15 junction at Devore. When you call, you get an arrival estimate based on where the technician is and the traffic at that moment.

Once the evening commute thins out on Mission Boulevard, drive times usually shrink. That makes an evening call before closing a practical option for non-urgent jobs that you couldn't fit into the workday.

About Ontario: Toyota Arena opened in late 2008 and hosts the AHL's Ontario Reign, while ONT Field opened in 2026 as home of the Dodgers' Single-A Ontario Tower Buzzers.

Planning a rekey in Ontario?

Call (951) 903-3193 and tell us how many doors you want on the new key and the brand of the locks if you know it. We'll quote the rekey before any work starts.