The best way to lock a gate is to fit a keyed deadlock or a lockable gravity latch, matched to the gate material and how often you use it. A basic lock replacement in Sydney typically costs about $255 (range $140–$400), and a deadbolt about $290.
This guide compares gate lock types, explains when a gate deadlock beats a latch, and covers shed doors, costs and common mistakes. It builds on our types of door locks guide.
Key points
- Match the lock to the gate material and thickness; thin tube frames suit surface-mounted locks rather than deep mortice cases.
- A gate deadlock gives far better forced-entry resistance than a spring latch alone.
- Pool gates have strict self-closing and self-latching rules, so check NSW requirements before changing hardware.
- Ask any locksmith for their NSW Class 2C licence number before work starts.
How to lock a gate securely
Start with the gate’s job, because a side gate that hides your meter box needs a different lock from a front garden gate.
- Lock a gate on the inside face: keep the keyhole where intruders cannot reach through the palings or bars to operate it.
- Use a keyed deadlock on side gates: these lead straight to your back door, so they deserve more than a spring latch.
- Pair the lock with a solid frame: a strong lock fitted to a rotten post or sagging gate will not stop forced entry.
- Choose corrosion-resistant hardware: salt air near the coast seizes cheap zinc locks within a few seasons.
- Fit a self-closing hinge or spring: a gate that swings shut and latches each time is more secure than one you must remember to lock.
- Keep a spare key off-site: leave one with a trusted neighbour or in a key safe so a lost key never leaves you stuck.
Gate lock types compared
| Gate lock type | Best for | Watch out for |
|---|---|---|
| Keyed gravity latch | Garden and side gates that you use daily | Weaker if the gate can be reached over the top |
| Surface-mounted deadlock | Side gates and timber gates | Needs a solid frame and long screws |
| Padlock and hasp | Rarely used gates and sheds | Cheap padlocks are easy to break; choose a hardened shackle |
| Drop bolt | Double driveway gates | Needs a socket in the ground that fills with dirt |
| Keypad or smart lock | Shared gates and short-stay rentals | Needs weatherproofing and a mechanical backup |
| Magnetic or electric lock | Automatic driveway gates | Needs power and a manual release for emergencies |
Best lock for a side gate
Side gates are the most targeted entry point on many Sydney blocks, so spend a little more here.
- Choose a deadlock over a latch: a solid bolt cannot be pushed back by a screwdriver or a firm shove.
- Check the gate’s thickness: thin sheet-metal gates need a lock designed for them, so measure before buying.
- Use a restricted key where possible: this stops copies being cut at a hardware store without authorisation.
- Add a shield plate: a metal plate over the lock area makes tampering harder on timber gates.
- Keep gaps tight: a large gap between gate and post gives leverage, so adjust hinges before fitting a lock.
- Consider keypad access: shared side gates for townhouses suit a code lock, see our security door locks guide for related options.
Gate deadlock: when a bolt beats a latch
A gate deadlock holds the gate with a solid bolt, so it does not rely on a spring that can be pushed back.
- Choose it for unattended gates: a bolt you throw with a key stays locked until you unlock it.
- Combine it with a latch: the latch keeps the gate closed in wind, and the deadlock secures it when you leave.
- Fit the keyhole to both sides: a double-cylinder lock lets you open the gate from either side, which suits shared access.
- Remember emergency exits: a gate that serves as a fire exit may need to open without a key; check the NCC exit-door egress rules.
- Ask a locksmith to re-key it: matching the gate to your house keys reduces what you carry, typically about $75 per lock in Sydney.
- Replace worn sets early: older locks with worn pin tumblers stick and snap keys, as explained in our sliding door locks guide for similar wear.
Shed door lock: matching the lock to the building
A shed door lock protects tools and mowers, which are among the most commonly stolen items from backyards.
- Use a hasp and hardened padlock: pick one with a covered shackle so bolt cutters cannot reach it.
- Fit through-bolts: use bolts that pass through the door rather than short screws into thin sheet metal.
- Choose a deadlock for timber sheds: a surface-mounted deadlock gives the best forced-entry resistance for the money.
- Protect the hinges: hinges with exposed pins let a thief lift the door away, so fit security hinges or fix the pins.
- Add an alarm or light: a motion light by the shed door makes casual theft less attractive.
- Use a portable lock for temporary storage: see our portable door locks guide for renter-friendly options.
Lock gate cost in Sydney
| Job (Sydney, Oct 2026, incl. GST) | Price range | Typical |
|---|---|---|
| Single basic lock replacement | $140–$400 | $255 |
| Deadbolt installation | $170–$460 | $290 |
| Re-key, per lock | $52–$140 | $75 |
| Key cutting, standard key | $6–$34 | $14 |
| Smart or digital lock, supplied and fitted | $345–$920 | $600 |
| Driveway gate lock or electric strike | Quoted individually (indicative — get itemised quotes) | Ask for a written quote |
After-hours, weekend and public-holiday call-outs carry a surcharge that varies by locksmith, so confirm the total price on the phone.
Which lock gate suits pool and rental properties
Some gates are regulated, and the lock is only one part of a compliant setup.
- Do not lock a pool gate with a key-only lock: pool gates must close and latch themselves, so confirm NSW requirements first.
- Ask a certifier about compliance: a locksmith can supply and fit hardware, but the compliance decision rests with the certifier.
- Check your lease on rentals: landlords and agents usually need to approve lock changes in writing.
- Check strata by-laws: common-property gates are controlled by your owners corporation, so request approval before changing them.
- Keep latch height safe: a latch placed beyond a young child’s reach is a safety feature, not a convenience issue.
- Book a licensed locksmith: compliant fitting matters, and you should always ask for their Class 2C licence number.
Common mistakes to avoid when you lock a gate
- Buying the cheapest padlock: thin shackles cut in seconds, so pay more for a hardened one.
- Ignoring sagging gates: a gate that drops on its hinges misaligns the latch and tempts you to leave it unlocked.
- Using short screws: long screws into solid timber or a steel post hold the lock much better than the short ones in the packet.
- Forgetting to lubricate: a dry graphite lubricant keeps a lock gate working; oil attracts dust and grit.
- Skipping the corrosion check: rust around the keyhole is an early warning that the lock needs replacing.
- Locking yourself out: if the key is lost, call a licensed locksmith, not a quick fix from the internet.
Lock gate FAQs
What are the main gate lock types?
The main gate lock types are keyed gravity latches, surface-mounted deadlocks, padlocks with hasps, drop bolts, keypad or smart locks and electric locks for automatic gates. Choose by material, how often you use the gate and whether it must meet pool or fire exit rules.
Is a gate deadlock worth it?
For side and rear gates, yes. A gate deadlock uses a solid bolt that a spring latch cannot match, and it only unlocks with the key. Installation of a deadbolt in Sydney typically costs about $290 (range $170–$460), and a licensed locksmith can match it to your house keys.
What is the best shed door lock?
For metal sheds, use a hardened padlock with a covered shackle on a hasp that is through-bolted. For timber sheds, a surface-mounted deadlock is usually best. Whichever you choose, strengthen the door and hinges as well, because a thief will attack the weakest point.
How do I lock a gate that has no lock?
Fit a surface-mounted deadlock or a lockable latch designed for your gate material. Check the gate’s thickness, hinge condition and post strength first. If you are not sure what suits your gate, book a licensed locksmith, who can supply and fit the right hardware.
For the wider picture, read our types of door locks guide, or book a licensed locksmith to fit or replace your gate and shed locks.
