Understanding Australian child safety window locks rules is essential for homeowners, landlords, strata body corporates, and property managers securing upper-storey bedroom and living room windows. At The Lock Warehouse, we stock NCC-compliant sliding aluminium window locks, timber sash restrictors, and C4 Keyed Alike window locks at our Victorian warehouse (Melbourne, Victoria) for fast 24 to 48 hour dispatch across Australia.
Quick Shop: Compliant Australian Window Locks & C4 Keyed Alike Packs (In Stock in VIC)
Shop trade-rated aluminium, awning, casement, and double-hung timber window locks with 24-48hr Victorian dispatch and free shipping over $149.95 AUD:
1. Sliding Aluminium, Awning & Timber Window Locks: Browse our complete Window Locks Category Hub (Carbine CMB, CMP, CMPL, CMVL Ventlocks, CSW, CVL & Whitco/Lockwood window hardware).
2. Replacement Window Keys, Packers & Spare Parts: Need matching keys or mounting packers? Visit our Window Lock Parts & Keys Hub.
3. Custom C4 Keyed Alike Window Locks & Melbourne Installation: Order C4 cylinder window locks with our Custom Keyed Alike Service (SKU: KA), or call All Secure Locksmiths on (03) 9306 6760 or 0421 149 760 for multi-window installation across Melbourne and Victoria.
Child Safety Window Locks Rules Across Australia (NCC & Strata Laws)
Under Australian child safety window locks rules set out in the National Construction Code (NCC / BCA) for Prevention of Falls from Openable Windows, any openable bedroom window (or any window in an early childhood centre or residential apartment where the drop from the outside window sill to the ground below is 2.0 metres or greater and the internal sill height is less than 1.7 metres above the floor) must be fitted with a compliant child-safety restrictor device or heavy-duty security screen that resists a horizontal outward force of 250 Newtons (approx. 25.5 kg of pressure).
BCA 100mm Window Restrictor & 125mm Opening Limit Explained
Homeowners frequently search for bca 100mm window restrictor specifications when preparing rental properties or strata inspections. While the statutory maximum test aperture in the Australian Building Code is a **125mm sphere** (meaning a 125mm solid test sphere cannot pass through the open window gap when the restrictor bolt is engaged), trade locksmiths routinely position sliding aluminium Ventlock striker holes or chain restrictors at a **100mm opening gap**. Drilling the ventilation locking hole at 100mm gives your family fresh overnight airflow while providing a 25mm safety buffer inside the 125mm legal maximum so frame flex or track wear never causes the window to fail a strata compliance test.
How to Install Locks on Aluminium Windows Safely (Without Cracking Glass)
Learning how to install locks aluminium windows takes less than 10 minutes per window when you keep the drill bit clear of the internal glass glazing pocket:
1. Mark the Centre Mullion Rail (Stay Clear of the Glass Bead): Never drill into the outer perimeter extrusion within 15mm of the glass rubber glazing wedge. Position your Carbine CMB, CMP, or CMVL Ventlock body on the flat inner face of the vertical meeting mullion rail where the moving sash overlaps the fixed sash.
2. Drill Pilot Holes & Dual Ventilation Striker Holes: Use a depth-stop collar on a 3.2mm drill bit for the self-tapping mounting screws. For sliding aluminium bolts (like the Carbine CMP or CMVL), drill one locking hole in the fully closed position and a second restrictor hole at 100mm open so the window can be deadlocked either shut or in the child-safe ventilation position.
3. Rental & No-Drill Clamp Options: If your tenancy agreement prohibits drilling into anodised aluminium tracks, use clamp-on track restrictors or request written landlord consent under state residential tenancies safety provisions.
Keyed Alike C4 Window Locks vs Factory Keyed Alike (92268) Packs
When upgrading an entire home in our Window Locks collection, you can choose between two convenient keying systems: (1) **Standard Factory Keyed Alike Window Locks**, which come pre-keyed out of the box to a universal Australian window key code (such as `92268` / `58000`) so every new window lock in your cart works on the same small wafer key at zero extra keying cost; or (2) **High-Security keyed alike c4 window locks** (such as the Carbine CMPL 5-pin C4 window lock), which contain a full-size Australian C4 brass pin-tumbler barrel that can be pinned via our Custom Keyed Alike Service (SKU: KA) to operate on the exact same house key as your front door deadbolt and leverset.
Frequently Asked Questions
Q1: Do child safety window locks rules require key-operated locks or push-button latches?
Compliant child-safety window restrictors can use either a key-operated locking bolt (like the Carbine CMVL Ventlock) or a dual-action spring release mechanism, provided it restricts the opening to less than 125mm and withstands a 250N outward force test.
Q2: Can I buy spare keys if I lost my existing window lock keys?
Yes. Most Australian Whitco, Lockwood, and Carbine domestic window locks use standard pre-cut key codes stocked in our Window Lock Parts category.
Q3: Who can install compliant window restrictors across my Melbourne property or apartment building?
Contact our mobile locksmith team at All Secure Locksmiths on (03) 9306 6760 or 0421 149 760 for fast on-site installation across Melbourne and Victoria.
