When it comes to securing your home, the right lock makes a significant difference. NZ locksmiths most commonly recommend a combination of deadbolts, euro-cylinder locks, and increasingly smart locks, depending on your door type, budget, and security needs. Here's a practical guide to help you understand your options.
Deadbolts — The Gold Standard for Entry Doors
A deadbolt is widely regarded as the most reliable lock for external doors. Unlike a spring latch, a deadbolt cannot be pushed back without turning the key or thumb-turn — making it far more resistant to forced entry.
- Single-cylinder deadbolts use a key outside and a thumb-turn inside. These are the most common choice for front and back doors.
- Double-cylinder deadbolts require a key on both sides. These offer extra security where glass panels are nearby, but they can be a fire safety risk if you can't find the key in an emergency — always keep a key accessible inside.
- Look for deadbolts that meet Grade 1 or Grade 2 ANSI/BHMA standards, or ask your locksmith about products tested to AS/NZS 4145 (the Australian/New Zealand standard for mechanical locks).
Euro-Cylinder Locks — Popular on Modern NZ Homes
Euro-cylinder locks (also called euro-profile cylinders) are the slim, oval-shaped cylinders found in many modern multipoint locking systems — especially on aluminium joinery doors common in NZ new builds.
They work well when paired with a multipoint locking system, which engages multiple bolts along the door frame simultaneously, offering excellent security. However, standard euro cylinders can be vulnerable to snap attacks (where the cylinder is physically snapped to expose the mechanism). For this reason, locksmiths strongly recommend upgrading to anti-snap, anti-pick, anti-drill cylinders — sometimes called security cylinders or high-security cylinders.
Brands such as Mul-T-Lock, ASSA Abloy, and Lockwood are well-known in the NZ market and offer quality cylinder options — ask your locksmith which suits your specific door hardware.
Knob and Lever Locksets — Convenience with Caveats
Lever-handle locksets are standard on many NZ interior and exterior doors. On their own, they typically use a spring latch rather than a deadbolt, which offers limited security. Locksmiths generally recommend pairing any lever lockset on an external door with a deadbolt above it for adequate protection.
Smart Locks — Growing in Popularity
Smart locks are becoming increasingly common in NZ homes. They allow keyless entry via PIN pad, smartphone app, or key fob, and many integrate with home automation systems.
Benefits of smart locks:
- No more lost keys or lockouts
- Temporary access codes for tradespeople or guests
- Activity logs showing who entered and when
- Remote locking and unlocking via app
Things to consider:
- Smart locks still need a solid deadbolt mechanism underneath — the electronics control access, but physical strength matters too
- Battery life needs monitoring; most will alert you when batteries are low
- Connectivity (Wi-Fi or Bluetooth) and app reliability vary between brands
- Ensure the lock is compatible with your existing door hardware before purchasing
Your locksmith can advise on reputable smart lock brands available in NZ and whether your door is suitable.
Padlocks and Hasps — For Garages, Gates, and Sheds
For garages, sheds, and gates, a quality closed-shackle padlock (where the shackle is mostly hidden, reducing bolt-cutter access) paired with a solid hasp and staple is the recommended approach. Look for hardened steel construction and a quality locking mechanism. Cheap padlocks offer very little real security.
Window Locks — Often Overlooked
Doors aren't the only entry point. NZ locksmiths frequently point out that windows are a common weak spot. Sash stops, key-lockable window stays, and window bolts are simple, affordable additions that significantly improve home security. This is especially relevant for ground-floor and easily accessible windows.
What About NZ Building Code Requirements?
The NZ Building Code via MBIE Building Performance sets out requirements for buildings, but specific lock grades for residential homes are not always mandated by the Code itself. However, your home insurer may have requirements — always check your policy, as some insurers specify minimum lock grades (such as a deadbolt on all external doors) for your cover to be valid.
For rental properties, the Healthy Homes standards via Tenancy Services include security requirements landlords must meet, so landlords should review these carefully.
Choosing the Right Lock for Your Home
A few key factors to discuss with your locksmith:
| Factor | What to Consider |
|---|---|
| Door material | Timber, aluminium, or composite doors suit different lock types |
| Door frame condition | A strong lock in a weak frame offers little protection |
| Risk level | Corner sections, rental properties, or high-crime areas may need higher-grade locks |
| Budget | Quality locks are an investment; mid-to-high range products offer significantly better protection |
| Insurance requirements | Check your policy for minimum lock specifications |
When to Call a Professional
While some homeowners are comfortable fitting a simple bolt or window lock, installing or replacing external door locks — particularly deadbolts, euro cylinders, and smart locks — is best left to a qualified locksmith. Incorrect installation can leave gaps in security or damage your door. A professional locksmith will also assess your whole door setup (frame, hinges, strike plate) to ensure the lock performs as intended. You can find qualified local locksmiths on tradedirectory.co.nz.
Note: Locksmithing in NZ is not a government-licensed trade in the same way as electrical or plumbing work, so it's worth choosing a locksmith who is a member of the Master Locksmiths Association of Australasia or who can demonstrate relevant qualifications and experience.
