Double Cylinder Deadbolt Installation in Ontario

How this works in Ontario

Fitting a double cylinder deadbolt is mostly standard door work with a few extra details. The door needs a 2-1/8-inch bore through the face and a 1-inch bore in the edge, a backset of 2-3/8 or 2-3/4 inches, and a thickness the lock supports, usually 1-3/8 to 1-3/4 inches; thicker doors need an extension kit. The interior cylinder sits farther out than a thumbturn, so we check clearance for curtains, door stops and security screens. Both cylinders are keyed alike, and high-security options from Medeco, Mul-T-Lock or ASSA Abloy add restricted keys that limit copies of the one key everyone depends on. The strike matters just as much: a box strike with 3-inch screws into the framing. We finish by testing from both sides with the key and agreeing where the key will live. If the glass sits too close to the bore or the stile is narrow, we explain the options before we drill, so nothing gets cut that cannot be undone.

Work included on a typical visit

• Double cylinder deadbolt installation on glass-panel doors. Glass within arm's reach of a thumbturn is the classic reason for a double cylinder. If the door and its use suit it, we install the lock, confirm the stile is wide enough for the bore, and set the cylinders square so the key turns without binding. Then we agree on where the key will live.
• Workshops, detached garages and outbuildings. Tool rooms, shops and detached garages hold valuable gear, and many have glass doors. A double cylinder deadbolt stops the reach-in entry, and one key can match your other exterior locks. We check door thickness, install the lock and confirm no other latch sits within reach of the glass.
• Keying, spare keys and the key plan. Because one key does everything, how you store it matters as much as the lock. We suggest a spot near the door but away from the glass, and a spare in a separate place. For households with kids or older relatives, we plan more carefully so nobody has to hunt in an emergency.
• Strike, jamb and frame reinforcement. Reaching in is one way past a door; kicking it is another. We reinforce the strike side with a heavy plate and long screws and examine the jamb for rot or old repairs. If the frame is in poor condition, we tell you plainly before we bolt anything into it.
• High-security and restricted-key double cylinders. Where one key controls the whole door, losing control of it is costly. Medeco, Mul-T-Lock and ASSA Abloy make heavier double cylinder deadbolts with restricted keyways, so copies need your authorization. We install them where the property justifies it and keep a record of the key card.

What's different about Ontario

Apartment tenants in Ontario often ask about double cylinders after a break-in on a balcony or glass door. In a rental unit, the main entry must keep working deadbolt hardware under California law, and tenants need to leave without a key in an emergency. We usually recommend reinforcing the strike, protecting glass and asking the landlord to approve any lock changes. Landlords can call us to remove an unauthorized double cylinder at turnover.

Shops in Ontario's strip centers usually have aluminum storefront doors with narrow stiles that can't take a standard bore, plus rear doors that serve as the second exit. A double cylinder typically isn't an option on an exit door. We use hookbolt deadlocks, exit devices and code-compliant keyed locks, and suggest film or laminate on glass near the lock. We never trade away exit capacity for security.

Newer homes in Ontario often feature tall sidelights and glass-paneled entries, which makes the double cylinder question common. Builders fit single-cylinder deadbolts to meet exit rules, and inspectors expect to see them. We suggest keeping the thumbturn on the entry door, strengthening the strike and considering laminated glass in the sidelight. A double cylinder suits secondary doors only where another exit exists.

Example situations

• An owner buys a double cylinder deadbolt online for a 2-1/4-inch solid door, and the key turns but the bolt doesn't move. The tailpiece is too short for the thickness. We switch to a thick-door kit with longer tailpieces and screws, check that the stile can hold the 2-1/8-inch bore, and set the strike for the extra door thickness so the bolt lands cleanly.
• A bungalow has a brass mail slot cut into the front door about eight inches from the deadbolt's thumbturn. The owner has read that a hooked wire fished through a slot can turn some thumbturns. A double cylinder would solve it but trap the household. We suggest sealing or relocating the slot, using a catch box, or mounting the deadbolt higher, and keep a normal thumbturn on the door.
• A daughter in Ontario asks about a double cylinder on her father's door because he has started wandering at night. We explain the fire risk: if he can't get out, neither can anyone helping him. We suggest door chimes, a different lock layout and a talk with his care team. We aren't care specialists, but we can help you find a lock that doesn't create a trap.
• A homeowner installed a double cylinder deadbolt years ago and keeps the key in the lock whenever someone is home. We point out the contradiction: a key sitting in the interior cylinder is exactly what a hand reaching through broken glass would turn. She chooses a single-cylinder deadbolt and laminated glass for the nearest pane, which solves the key problem and the glass problem.

From your call to the finished job

1. Talk through the door and the reason. Call (951) 903-3193 and tell us which door it is, what it's made of, where the glass sits and why you want a keyed-both-sides lock. A couple of photos help. We ask whether another exit exists, because that answer shapes everything that follows.
2. Check exits, glass and the people involved. We measure how far the glass is from the lock, test whether a hand could reach it, and note who uses the door. That tells us whether the double cylinder really adds security or only adds risk. You get a plain recommendation and the reasoning behind it.
3. Measure, quote and choose the hardware. We measure door thickness, backset and stile width, then pick a deadbolt that fits: standard thickness, a thick-door kit or a narrow-stile alternative. You see grade and finish options and get a quote before any hole is drilled.
4. Prepare the door. Doors with glass need careful drilling. We mask the panes, clamp the jig, cut a clean 2-1/8-inch bore and a 1-inch edge hole, and check that nothing intrudes on the glass stop. Wood chips and dust are cleaned up before we mount anything.
5. Fit both cylinders, key them and set the strike. We mount the bolt, then fit the exterior and interior cylinders through the tailpiece, aligned so the keyway sits upright when unlocked. Both are keyed alike to your key. Then the strike goes in: a box strike with 3-inch screws into the framing.
6. Test the lock and plan the key. The visit ends with an actual drill: door locked, key at the planned spot, you walking from the far side of the room. If that feels slow, we rethink the plan or the lock. We hand over keys and note the keyway and brand for your records.

How we quote the job

• Strike and frame reinforcement. Strike work is a modest add-on that makes a real difference. Heavier plates and long screws cost little. Repairing rotted wood or a bowed frame costs more, and it may fall outside our trade. We identify the problem before we price the lock.
• Keys and keying. Starting fresh with a new key costs about the same as matching your old one, but matching saves you carrying another. Keyed-alike plans across several doors add time per lock. Restricted systems add cards and slower copying. Tell us which approach you prefer.
• Glass protection you add separately. Protecting the glass is often the better fix, and it is priced apart from our visit. We don't install glass or film, so we explain what to request from a glazier and quote our own part clearly. That keeps the two jobs, and the two costs, from getting mixed together.

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

• Consider laminated glass or security film first. Either one targets the weakness without changing how the lock works. A glazier can replace the pane nearest the lock, and a film installer can add a layer to existing glass. Pair that with a strong single-cylinder deadbolt and a long-screw strike.
• Practice getting out. With the door locked, walk from the farthest room to the door in the dark and use the key. Do it with children and guests too. If it takes more than a moment, rethink the plan or the lock. Repeat the drill whenever the household changes.
• Tell every adult in the household, and any regular visitors, where the key lives. A babysitter, a house guest or an older relative who has never seen the lock should be shown on arrival. A note taped inside a cabinet door can help, as long as it isn't visible from outside.
• Don't count on a spare key under a mat or in a flowerpot for a keyed-both-sides door. It's the first place a burglar looks, and it doesn't help anyone leaving from inside. Leave the spare with a trusted neighbor or relative, or in a lockbox with its own code.

Common errors that cost time and money

• Buying a double cylinder deadbolt online without checking the door. The stile may be too narrow, the thickness may be wrong or the glass may leave no room for the bore. Returning a lock is cheaper than repairing a damaged door. Measure first, or have us check before you buy.
• Giving out one key and no plan. A single key hung on a nail that only one family member knows about leaves everyone else dependent on that person. Spread the knowledge: everyone who lives there needs to know where the key is and how to use it.
• Using a double cylinder on a bedroom or an only-exit door. Bedrooms and the only route to an exit need to open without a key. A keyed-both-sides lock there can trap people, especially kids, during a fire, a medical emergency or an ordinary lockout from the wrong side.

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 Haven Avenue, 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: Ontario International Airport serves as the West Coast air and truck hub for UPS and a major distribution point for FedEx Express.

New or replacement locks in Ontario?

Call (951) 903-3193 and tell us which doors and what kind of hardware you have in mind. If you already bought the lock, keep the box handy so we can check it fits the door, and we'll quote the install before any work starts.