How to Change a Door Lock (Step by Step)

Before you pick up a screwdriver or call a locksmith, it helps to understand what lock changes actually cost across Australia. Prices vary based on the type of service, the time of day, and your location.

One Reddit user reported paying $680 for a new deadlock installation plus rekeying two other locks to a common key. That aligns with real-world pricing once you factor in a call-out fee, labour, and hardware. As a general guide, expect a call-out fee of around $80 to $120, then $30 to $40 per lock for rekeying, or significantly more for a full replacement with new hardware.

Emergency jobs attract a premium. If you are locked out at 2am, $150 to $350 is a realistic range, not a rip-off. Getting a quote before the locksmith starts work is strongly recommended.

Many homeowners assume they need a full lock replacement when rekeying would solve the problem at a fraction of the cost. Understanding the difference saves money.

Rekeying

Rekeying changes the internal pin configuration of your existing lock cylinder so that old keys no longer work. The lock hardware stays in place. This is ideal after moving into a new home, after a relationship breakdown, or after losing a key. It costs significantly less than a full replacement, usually $30 to $60 per lock plus the call-out fee.

Full Lock Replacement

Replacing the lock means removing the entire lockset and installing a new one. This makes sense when the lock is damaged or worn out, when you are upgrading to a higher security grade, or when you want a deadlock installed where there was none before. Expect to pay $200 to $400 or more for a quality deadlock such as a Lockwood 001 or Abloy CL100, supplied and installed.

Keying Alike

If you have multiple locks on a property, a locksmith can rekey or replace them so a single key operates all of them. This is a practical upgrade many Australians combine with a lock change. One Reddit commenter mentioned having eight locks keyed alike, which is a cost-effective approach when done in a single visit.

Changing a standard deadlock or doorknob lock is a manageable DIY task if the door and frame are in good condition and you are replacing like-for-like hardware.

What You Will Need

A Phillips head screwdriver, a flathead screwdriver, a measuring tape, and a replacement lock that matches your existing hole configuration. Brands like Lockwood, Gainsborough, and Carbine are widely available at Bunnings and most hardware stores.

Step 1: Remove the Old Lock

Open the door and locate the screws on the interior face plate or rose. Remove them and pull the interior and exterior handles or cylinders apart. For a deadlock, unscrew the cylinder retaining screw from the edge of the door, then push the cylinder out from one side.

Step 2: Check the Backset and Measurements

The backset is the distance from the edge of the door to the centre of the lock hole, typically 60mm or 70mm in Australia. Match this on your new lock. Also check the spindle length and door thickness to make sure your replacement hardware fits.

Step 3: Install the New Lock

Insert the new cylinder or lockset into the existing holes. For a deadlock cylinder, slide it in from the outside, align the cam or tailpiece with the lock mechanism, and tighten the retaining screw from the edge of the door. Attach the interior thumb turn. For knob or lever sets, follow the manufacturer's instructions, which are usually straightforward.

Step 4: Test Before Closing the Door

With the door open, test the lock operation with the new keys. Check that the bolt extends and retracts smoothly. Then close the door and test again to confirm the bolt aligns with the strike plate correctly.

When DIY Is Not Appropriate

If the door frame is damaged, the existing holes do not align with the new lock, or you are installing a deadlock for the first time into a solid timber or aluminium door, call a licenced locksmith. Drilling new mortise holes without the right tools leads to costly mistakes.

With over 700 lock change and replacement businesses operating across Australia, finding a qualified locksmith is straightforward. The average rating across the industry sits at 4.7 out of 5 stars, which reflects a generally high standard of service.

Check for Licencing

Locksmiths are licenced tradespeople in most Australian states and territories. In New South Wales, Victoria, and Queensland, a locksmith must hold a valid security licence. Always ask for licence details before booking, particularly for after-hours callouts.

Get a Quote First

Ask for the call-out fee, the per-lock labour rate, and whether parts are included or quoted separately. Reputable operators will give you a clear breakdown over the phone. Businesses like Wynns Locksmiths Preston (4.8 stars, 1,390 reviews) and Sheehan Locksmiths (4.9 stars, 934 reviews) have established reputations built on transparent pricing and reliable service.

Emergency Service Availability

82% of lock change businesses in Australia offer 24/7 emergency service. If you are locked out outside business hours, most major cities have strong coverage. Melbourne leads with 216 listings, followed by Sydney with 179, Brisbane with 90, and Perth with 72.