Deadlock vs. Knob Lock: Which Lock Type Should Perth Homeowners Install?
- •Knob locks alone offer weak protection — a basic screwdriver can defeat them.
- •Deadbolts extend a reinforced steel bolt into the door jamb, making forced entry far harder.
- •Most Perth security experts recommend combining both lock types on exterior doors.
- •Rekeying existing locks is often more cost-effective than full replacement.
- •The right choice depends on door type, location, and whether the door is interior or exterior.
You’ve just noticed your front door has nothing but a standard knob lock — the same type fitted on interior bedroom doors. If that sounds familiar, your home may be far easier to break into than you think. Choosing the right lock type is the single most impactful security decision a Perth homeowner can make.
What Exactly Is a Deadlock — and How Does It Work?
Understanding the mechanism that makes deadbolts the gold standard in home security.
A deadlock (or deadbolt) works by driving a solid steel bolt directly into the door frame’s strike plate and jamb when you turn the key. Unlike spring-bolt locks, there is no spring mechanism — the bolt cannot be pushed back without the key. This is why deadbolts resist kick-in attacks and shimming attempts that defeat knob locks in seconds.
According to the source documents, deadbolts include a reinforced steel bolt that penetrates both the metal strike plate and the door jamb, reinforcing the door against being kicked in or forced open. That physical depth of engagement is what separates a deadbolt from almost every other consumer lock type.
Most opportunistic thieves are looking for easy targets. A quality deadbolt dramatically increases the effort required to force entry — enough that most petty criminals simply move on to the next property.
What Are Knob Locks Good For — and Where Do They Fall Short?
Knob locks have a place in your home — just not on your front door.
Knob locks are spring-latch mechanisms — the angled bolt retracts automatically when the door closes and can often be manipulated with a credit card or slim tool. They’re perfectly adequate for interior doors like bedrooms and bathrooms, where you need privacy rather than security.
The problem is that many Perth homes still have knob locks as the sole lock on exterior doors — especially older properties. Basic door locks can be easily forced with tools as simple as a screwdriver, offering little protection at any time of day or night. If this is your situation, upgrading is urgent. Our full range of lock installation services covers exactly this scenario.
Should You Install a Deadlock, a Knob Lock, or Both?
The answer changes depending on which door you're securing.
For exterior doors — front entry, back door, side gate access — a deadbolt is non-negotiable. For maximum security, pair it with a knob or lever lock set so the door latches securely without you needing to manually throw the deadbolt every time. This dual-lock approach is what most experienced Perth locksmiths recommend.
For interior doors, a knob lock or privacy latch is entirely sufficient. Spending on a deadbolt for a bathroom door is unnecessary — save that budget for where it counts. If you’re unsure which of your doors qualify as security risks, it’s worth reading our related article on the top signs it’s time to replace or upgrade your door locks in Perth.
- •Front entry door: deadbolt + knob/lever lock set
- •Back and side exterior doors: deadbolt minimum
- •Sliding doors: specific patio bolt or pin lock required — standard deadbolts don't fit
- •Interior bedroom/bathroom doors: knob or lever privacy lock
- •Garage-to-house door: treat as an exterior door and fit a deadbolt
If you’ve recently moved into a new Perth home, rekeying your locks before worrying about upgrades is the smartest first step. Previous owners, contractors, and real estate agents may all have copies of your current keys — rekeying cuts off that access immediately at a fraction of the cost of new locks.
How Do Digital Locks Compare to Traditional Deadbolts?
Modern alternatives offer convenience — but the core security principle stays the same.
Digital locks and keypads are increasingly popular in Perth homes and businesses. Ultimate Lock installs a range of digital locks and electronic systems for both residential and commercial clients. These can offer keyless entry, audit trails, and remote access — genuine advantages for busy households or rental properties.
However, the underlying deadbolt mechanism in most digital locks is still the critical security element. A digital lock with a solid bolt and quality strike plate is excellent. A digital lock with a weak latch is still a weak lock — regardless of how many codes it accepts. When comparing options, our complete guide to lock installation services in Perth covers how to evaluate both traditional and digital lock choices side by side.
Common Questions Perth Homeowners Ask About Lock Types
Straight answers to the questions we hear most often on the job.
Can I just rekey my existing knob lock instead of adding a deadbolt?
Rekeying changes which key operates your lock — it doesn’t change the lock’s physical strength. If your exterior door only has a knob lock, rekeying won’t improve your security against forced entry. You need to add a deadbolt as well, then rekey both to the same key for convenience.
Are deadbolts required by Perth building codes for new homes?
Building codes and insurance requirements vary, and it’s worth checking with your insurer directly — some policies require deadbolts on exterior doors to maintain cover. Some insurers offer reduced premiums for homes with enhanced security measures like deadbolts. A licensed locksmith can advise on what’s expected for your property type.
How much does it cost to add a deadbolt to an existing door in Perth?
Costs vary based on the lock grade, door material, and whether new holes need to be drilled. For detailed pricing, the related article on how much professional lock installation costs in Perth breaks this down clearly. The short answer: it’s a modest investment compared to the cost of a break-in.
Do commercial properties need different locks to residential homes?
Yes — commercial properties typically require higher-grade hardware including electric strikes, magnetic locks, panic exit devices, and access control systems. Ultimate Lock services all commercial clients across Perth, from small businesses to body corporates. See the related article on commercial lock installation in Perth for a full breakdown.
Ready to Upgrade Your Perth Home's Locks?
Whether you need a deadbolt added, locks rekeyed, or a full security assessment, Ultimate Locksmith Perth is available 24/7 across all Perth suburbs. Call 0481 365 802 now or request a quote online.
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Part of our guide: Complete Guide to Lock Installation Services in Perth: Secure Your Home & Business