Door Knob Lock vs. Deadbolt: Do You Need Both?

A door knob lock is a spring-latch mechanism built directly into the knob assembly. When you close the door, a beveled latch bolt slides into the strike plate automatically. Turn the knob — or use a key from outside — and the latch retracts so the door swings open. This design is convenient, low-maintenance, and works perfectly well for interior privacy, which is why a door knob with lock for bedroom use remains one of the most common residential hardware choices. Inside the home, that level of security is genuinely appropriate.

The problem emerges on exterior entry doors. Because the latch bolt is spring-loaded and beveled, it can be forced back with a credit card, a stiff piece of plastic, or simple sustained pressure in a matter of seconds — no special knowledge required. The knob itself is also a mechanical lever; enough torque applied with a pipe wrench or similar tool can shear the housing and expose the mechanism. Professional locksmiths who work with law enforcement on post-burglary assessments consistently find that knob locks were the point of failure in a large share of forced-entry incidents. Knowing how easy these locks are to defeat is not the same as knowing how to pick a door knob lock in detail — but it does illustrate why treating a knob lock as your only exterior line of defense is a risk not worth taking in any Chesapeake neighborhood.

A deadbolt throws a solid steel bolt — typically one inch or more — deep into the door frame and strike plate when you turn the key or thumb-turn. There is no spring action, no bevel, and no way to shimmy it open. A properly installed single-cylinder deadbolt requires the key from the outside and the thumb-turn from the inside, which means the latch-shimming technique that defeats a door knob lock simply does not apply. When the dead bolt and the knob lock are both engaged, a would-be intruder faces two mechanically independent barriers at different heights on the door — dramatically increasing the difficulty and the time required to force entry, which is the single greatest deterrent short of a reinforced frame.

Chesapeake Pro Locksmith installs and upgrades deadbolts across the city every week. The most common call we receive goes something like this: a homeowner near the Deep Creek neighborhood just had a close call, or a landlord is turning over a property on Dock Landing Road and realizes the existing hardware is a decade old. In both situations, the right move is a professional assessment of the full door assembly — not just the lock cylinder. Strike plate depth, door frame condition, and hinge security all factor into whether your deadbolt will actually hold under pressure. If you want a fast, informed evaluation, call (757) 785-4657 — we answer around the clock and can often reach you the same day.

When locksmiths talk about lock types, terminology matters — and it tends to confuse homeowners. A mortise lock is a complete lockset that is recessed into a pocket (the mortise) cut into the door edge. Rather than separate knob-lock and deadbolt components bolted onto the surface, a mortise lock integrates both a latch and a deadbolt into a single steel case, along with levers or knobs. This makes it mechanically stronger and more resistant to door-edge attacks than most surface-mounted hardware. Mortise locks are the standard on many older Chesapeake homes with solid wood doors, on commercial storefronts along Battlefield Boulevard, and on upscale new construction where security is a priority from day one.

Understanding these terms also helps you have a smarter conversation with your locksmith. Knowing the difference between a mortise lock, a cylindrical lock (the technical name for most door knob with lock assemblies), and a rim lock (common in older construction) tells you what questions to ask, what upgrade paths exist, and roughly what the scope of work involves. At Chesapeake Pro Locksmith, our experienced team handles mortise lock installation, re-keying, and repair as a core service — not an occasional add-on. Factors that shape the final quote include the lock type you are upgrading to, the condition of the existing door and frame, any parts that need sourcing, and the time of day we are called out. We confirm an exact, up-front price before any work begins so there are no surprises on the invoice.

Locksmithing is a genuine trade with real specialisations. A residential locksmith focuses on door hardware, re-keying, lock-out response, and safe work for private homes. A commercial locksmith deals with master-key systems, access-control panels, panic bars, and high-security mortise lock installations for businesses. An automotive locksmith handles transponder keys, key fobs, and ignition systems. Some locksmiths — like our team — are trained across all three specialisations, which matters when a Chesapeake homeowner also needs help with a car lockout in the same service call. Regulation varies significantly by country: in the United Kingdom, locksmithing is currently an unregulated trade, though industry bodies encourage voluntary codes of practice, and UK locksmiths commonly work with British Standard mortise locks rated to BS 3621. In the United States, licensing requirements differ state by state, with some states requiring a formal license and others leaving the trade self-regulated. In Virginia specifically, the question of whether you need a license to be a locksmith depends on which services you offer: locksmiths who also install alarm systems or electronic access control fall under the Virginia Department of Criminal Justice Services licensing requirements, while those performing purely mechanical lock work operate under different rules. What that means for you as a consumer is straightforward — always ask your locksmith about their training, experience, and insurance before letting them work on your home.

As for what locks locksmiths cannot open: a trained locksmith can open virtually any residential or commercial lock given the right tools and enough time. The more accurate question is what locks are designed to slow that process down significantly — high-security cylinders with anti-pick pins, anti-drill plates, and hardened steel inserts are engineered to make unauthorized entry extremely difficult even for skilled professionals, which is precisely why they are worth the investment on your primary entry door. When a legitimate locksmith responds to a lockout, they will verify your ownership or tenancy before proceeding — that is standard professional practice, not optional. If a locksmith skips identity verification entirely, that is a serious warning sign. One related question homeowners often ask: can a locksmith make a new key from a lock? Yes — a process called decoding allows a trained locksmith to read the internal pin configuration of a lock cylinder and cut a working key without needing the original, which is invaluable when keys are lost and re-keying is not yet on the agenda.

The practical recommendation from Chesapeake Pro Locksmith is consistent: on any exterior door, run both a door knob lock and a grade-1 or grade-2 deadbolt as a minimum. If the door is a primary entry point or you have elevated security concerns, a mortise lock that integrates both functions into a hardened case is worth discussing with our team. Reinforce the strike plate with three-inch screws that reach the stud behind the door frame — the standard half-inch screws that come with most hardware are almost useless under kick-force. Consider door-frame reinforcement kits if the frame is hollow-core or shows wear around the existing strike area. Finally, re-key or replace locks whenever you move into a new home, after a break-up with a shared-key holder, after a contractor has had access, or if your keys go missing. Re-keying is faster and less expensive than full replacement and renders old copies useless immediately.

For homeowners asking about a locksmith call-out fee: the cost of a service call is influenced by the time of day, the distance our mobile unit travels to your location, the work involved, and the parts or hardware required. A 2 a.m. response to a lockout in South Chesapeake will be quoted differently than a next-day scheduled re-keying job — and we explain exactly what drives the number before we begin. There are no hidden fees and no pressure. If you are ready to upgrade your entry door security, or you simply want a professional set of eyes on your current setup, our team is available every hour of every day. Call (757) 785-4657 and we will dispatch a skilled locksmith to your location, assess your hardware honestly, and walk you through your options in plain language — no jargon, no upsell pressure, just straight answers.

Chesapeake Pro Locksmith is a fully mobile, insured operation serving every corner of Chesapeake, VA — from the rural stretches of the Western Branch to the dense commercial corridors near Greenbrier. Our services include: residential lockout response, commercial lockout response, automotive lockout response, mortise lock installation and repair, deadbolt installation and upgrade, door knob lock replacement, re-keying of residential locks, re-keying of commercial locks, master-key system design and installation, high-security cylinder upgrades, lock-picking assessment and security audits, door frame and strike plate reinforcement, panic bar and push-bar installation, electronic access control installation, keypad and smart-lock installation, transponder key programming, laser-cut and high-security key duplication, broken key extraction, ignition lock repair and replacement, safe opening and combination changes, padlock cutting and replacement, mailbox lock replacement, garage door lock service, sliding door lock installation and repair, and after-hours emergency locksmith response for both home and business. Whether the job is a straightforward knob lock swap on a bedroom door or a full commercial re-key of a multi-unit property off Cedar Road, our experienced team has the tools and the training to handle it right the first time.