The Best Door Locks for Adelaide Homes (2026 Guide)

For most Adelaide homes, the best door lock is a keyed-both-sides deadlock that meets Australian Standard AS4145.2, fitted to a solid front and back door with a strike plate secured into the timber frame, not just the jamb lining. Everything else, brand, finish, smart features, matters less than that one combination getting right.

What actually resists forced entry

Break-ins in Adelaide suburbs are rarely a sophisticated lock-picking job. In the callouts we see across the network, the door usually gives way one of 3 ways: the latch is forced with a screwdriver or credit card because there is no deadlock engaged, the door is kicked and the strike plate rips out of a thin pine jamb with 25mm screws, or a sliding door is simply lifted off its track. A single spring latch, the kind that self-locks when the door swings shut, stops almost none of these. It is designed for privacy, not security.

A deadlock throws a solid bolt at least 20mm into the frame with no spring action, so it cannot be slipped or forced back with a card. Everything above that baseline (anti-drill pins, hardened steel inserts, high-security key control) adds resistance against a determined, skilled attacker, a smaller share of residential break-ins than a fit-and-forget deadlock addresses.

The lock is only half the story. The strike plate, the metal plate the bolt slides into, is what actually takes the force in a kick-in attempt, and on plenty of project-home doors it is held in with 2 short screws into softwood. Extending those to 65mm to 75mm screws that bite into the structural frame behind the jamb turns a cosmetic strike plate into a real barrier, and it is one of the cheapest upgrades available relative to the security gained. On outward-opening doors, exposed hinge pins can be knocked out from outside, so hinge bolts or non-removable pins close that gap too.

Deadlocks, keyed-both-sides, and AS4145.2

AS4145.2 is the Australian Standard that governs deadlocks and deadlatches for domestic doors, and it is the number a locksmith or hardware supplier should be able to point to on the box. A lock stamped to this standard has been tested for bolt throw, resistance to drilling and sawing, and key-pull strength, so it is a genuine baseline rather than a marketing label.

Within that standard, the biggest practical decision is single-cylinder versus double-cylinder (keyed-both-sides):

• Single-cylinder deadlock: keyed on the outside, a thumb-turn on the inside. Faster to exit in an emergency, and the only legal option on some doors, see the fire-egress note below.
• Double-cylinder (keyed-both-sides) deadlock: requires a key from both sides, including from inside. This stops the common trick of breaking a nearby window and reaching in to turn the thumb-latch, which is one of the more preventable entry methods we see reported after break-ins with glass panels near the door.

Keyed-both-sides is the stronger security choice for a front door with a glass sidelight or a panel your arm could reach through. The trade-off is that everyone inside needs to know where the key lives, because you cannot simply turn a knob to get out in a fire. Never leave a keyed-both-sides deadlock with no key nearby.

Fire-egress rules: where double-cylinder locks are not allowed

South Australian building requirements (aligned with the National Construction Code) restrict keyed-both-sides locks on doors that form part of a required exit path, mainly bedroom doors and the main path of travel to the street in newer or multi-storey homes. The logic is simple: in a fire at 2am, nobody should be fumbling for a key to get a child out of a bedroom. If you are unsure whether a door in your home falls under an egress rule, check with a licensed locksmith before you buy hardware, since getting it wrong is a safety issue, not just a compliance one. A practical split that covers most Adelaide homes: keyed-both-sides deadlocks on the front door and any door with adjacent glass, single-cylinder deadlocks (or a quality deadlatch) on bedroom doors and fire-escape routes.

Smart locks: convenient, but check the mechanical bolt underneath

Smart locks solve a genuine problem, juggling keys for kids, tradespeople, or short-stay guests, and app-based access logs are useful if you want to know who came and went. The security question to ask before buying one is not about the app, it is about the physical bolt: does the smart lock still throw a deadbolt to AS4145.2, or is it a motorised latch bolted onto a standard lock body? Some budget smart locks prioritise the electronics and use a lighter-duty bolt than a purpose-built deadlock, which undoes the security benefit of upgrading in the first place.

Battery life is the other practical factor, since a smart lock that drains its batteries and locks you out is its own kind of problem. If you want a smart lock, look for one built around a certified deadbolt mechanism rather than a standalone motorised latch, and keep a physical key override as backup.

What holds up, and what a fitting job typically costs

Across the jobs reported through the network, the homes that avoid repeat break-in attempts tend to share the same pattern: a keyed-both-sides deadlock to AS4145.2 on the front door, matching deadlocks on the back and any side entries, deep strike-plate screws into the frame, and hinge protection on outward-opening doors. Brand matters less than correct standard, correct fitting, and matching the lock to the door it is going into. A correctly rated deadlock installed with short screws into thin timber is barely better than the latch it replaced, so fitting quality is worth as much attention as the lock itself.

These are typical Adelaide ranges, and your quote may differ depending on the door type, whether the frame needs reinforcing, and how many doors you are upgrading at once. Try the home lock security grader to see where your current setup sits before you spend anything. If you are weighing a full upgrade against rekeying what you already have, rekeying versus replacing walks through when each makes sense, and if you are still deciding between the 2 main lock types, deadlocks versus deadbolts explained covers the terminology in plain English.

For a home security upgrade fitted properly the first time, the residential locksmith page explains how we connect you with a vetted, licensed Adelaide locksmith who can assess your doors and quote the job.