Lock Picking and Bump Keys: How Secure Is Your Home?

Before getting into how bump keys and lock picking work, it helps to understand what professional advice and security upgrades actually cost in Australia. Knowing this upfront means you can budget properly rather than getting a surprise quote.

According to Hipages 2026 data, a basic lock change runs between $70 and $200, while rekeying sits at $70 to $130. If you call someone out after hours, expect to pay significantly more. Reddit discussions from Australian users highlight after-hours callout fees ranging from $100 to $150 just to show up, with total bills for a half-hour job sometimes reaching $500 or more.

Some of Australia's most trusted businesses give you a clearer picture of real-world pricing. Terry's Locksmiths, rated 4.9 stars across 3,017 reviews, is a well-established option for security assessments. Express Locksmith Gold Coast and Tweed, rated 5.0 stars from 1,375 reviews, handles residential security upgrades along the Gold Coast and Tweed corridor. Wynns Locksmiths Preston, rated 4.8 stars from 1,390 reviews, is a popular choice in Melbourne's northern suburbs. These businesses reflect the broader national average rating of 4.7 stars across 704 locksmith listings.

A bump key is a specially cut key that works on standard pin tumbler locks, which cover the vast majority of residential door locks sold in Australia. The key is cut to the maximum depth at every tooth position, then inserted into the lock and struck or bumped with a mallet or screwdriver handle while applying rotational tension.

When the key is bumped, the pins inside the lock jump momentarily. During that fraction of a second, the driver pins briefly separate from the key pins at the shear line, and the cylinder rotates. An experienced person can open a standard deadbolt in under 30 seconds using this method.

The technique has been documented since the 1970s but became widely known after a 2005 Dutch security conference demonstrated it publicly. Today, bump keys are sold online and are not difficult to obtain. This is not a specialist skill reserved for professionals.

Lock picking is a distinct skill from bump key attacks, though both target pin tumbler mechanisms. Where bumping relies on physics and a single rapid movement, picking involves manually manipulating each pin stack into position using two tools: a tension wrench and a pick.

Single Pin Picking (SPP)

This is the most precise method. The locksmith or attacker applies light rotational tension with a tension wrench while using a hook pick to lift each pin individually until it sets at the shear line. A quality Medeco or Mul-T-Lock cylinder is significantly harder to pick this way because of additional security pins and sidebar mechanisms.

Raking

Raking uses a serrated pick moved rapidly back and forth while tension is applied. It is faster but less reliable, and it tends to leave minor scratch marks inside the keyway. A standard Gainsborough or Lockwood deadbolt without security pins can be raked open in under a minute by a practised hand.

Impressioning

Impressioning involves inserting a blank key, applying pressure, and marking where the pins contact the blank. The key is then filed to match those marks. This takes longer but produces a working key rather than requiring the lock to remain unlocked.

The majority of Australian homes rely on standard pin tumbler deadbolts, often branded Lockwood or Gainsborough. These are reliable locks, but the basic versions use standard driver pins with no additional security features, making them susceptible to both bumping and raking.

Disc detainer locks like the Abloy Protec2 use a completely different internal mechanism to pin tumbler locks. Bump keys simply do not work on them. Picking requires specialist tools that are difficult to obtain and considerable practice, making them among the most resistant options available to Australian homeowners.

Once you understand how bumping and picking work, improving your home security is straightforward. Follow these steps in order of priority.

1. Identify your current locks. Check the brand name on your existing deadbolts. If they are standard Gainsborough or basic Lockwood cylinders installed more than ten years ago, they are likely to have no security pins.

2. Book a security assessment. Contact a licensed locksmith and ask for a lock security review. During business hours, this typically costs $65 to $100. Sheehan Locksmiths, rated 4.9 stars from 934 reviews, is one example of a business that offers this type of residential consultation.

3. Upgrade to a bump-resistant cylinder. At minimum, request a Lockwood 003 Series or equivalent with spool pins. For higher-risk properties, discuss Mul-T-Lock or Abloy options with your locksmith. Budget $150 to $400 per door for supply and installation depending on the grade.

4. Reinforce the door frame. Ask your locksmith to inspect the strike plate. Replace standard short-screw strike plates with a heavy-duty version secured with 75mm screws reaching the wall stud behind the frame.

5. Consider a smart lock as a secondary layer. Smart locks with deadbolt actuation do not replace a quality mechanical cylinder but add an audit trail, remote access, and alarm integration. Hipages data lists digital door lock installation as a common service in 2026.

6. Check rear and side entry points. Many break-ins occur through secondary doors with inferior locks. Apply the same standard to every exterior door, not just the front.