Window hardware in Australian construction: latches, stays, restrictors, locks

TL;DR

Window hardware is the assembly of latches, stays, restrictors, and locks that operates and secures windows across Class 1a houses, Class 2 apartments, and Class 3-9 commercial buildings. Commercial applications add heavier-duty stays, restrictor sets approved for higher occupancy loads, and acoustic-rated frames to the same product families. The single most important compliance call is child window restrictors under AS 5203:2016 and NCC 2022 ABCB Housing Provisions Part 11.5: any window in a Class 1 (dwelling) or Class 2 (apartment) building where the opening is 2 metres or more above the surface below AND the opening would be wider than 125 mm, must be fitted with a restrictor or screen that limits the opening to 125 mm or less. The restrictor can be permanent or have a release mechanism that requires a deliberate two-step action. The other hardware categories: latches (hold the window closed), stays (hold the window at a specific open position), locks (key or thumb-turn securing for security), handles (operating mechanism for the sash), and casement gear (the friction-stay arm that controls casement and awning windows). The AU brand market is led by Whitco (the dominant sliding-window hardware brand), Doric (window-and-door hardware specialist), Pryda, Logikhaus (premium uPVC and timber window hardware), and the European brands Roto Frank and Maco (premium thermally-broken uPVC windows). The two job-killers: missing or undersized restrictors on upper-storey bedroom windows (a real defect that NCC compliance audits catch, and a real safety issue if a child can fall), and galvanic corrosion in coastal locations from mixed-metal hardware (steel and aluminium hardware in salt-spray exposure fails within years).

What it is

Window hardware refers to all the mechanical components fitted to a window assembly that control opening, closing, locking, and restriction. The Australian Standard for the window assembly itself is AS 2047:2014 (Windows and external glazed doors in buildings); window-specific safety requirements (child restrictors) are in AS 5203:2016; window-lock security follows AS 4145.2:2008 where applicable.

The categories:

Category	Function	Examples
Latch	Holds window closed under wind load and casual use	Cam latch, claw latch, slide latch
Lock	Secures window against unauthorised opening	Key-locked sash lock, push-button lock, thumb-turn
Stay	Holds window at one or more open positions	Friction stay, chain stay, telescopic stay
Restrictor	Limits maximum opening for safety	Cable restrictor, scissor restrictor, fixed bar
Handle / operator	The user-facing control	Cam handle, lever, push-bar, crank handle
Casement gear	Controls casement window operation	Friction hinge, motorised actuator
Sash balance	Counterweights sash window	Spring balance, cord-and-weight
Screen	Insect or pet screen (also serves as restrictor in some products)	Fixed screen, retractable, sliding

AS 5203 child window restrictors

Under NCC 2022 ABCB Housing Provisions Part 11.5 (Protection of openable windows), restrictors are mandatory in specific situations:

Situation	Restrictor required?
Window in Class 1a/1b/2 building, opening 2 m or more above surface below, opening can be wider than 125 mm	Yes (AS 5203:2016)
Same as above but opening is 125 mm or less	No (already child-safe)
Same as above but window does not open	No
Surface below is less than 2 m drop (ground-floor or rear deck within 2 m)	No
Class 3+ buildings	Different criteria; check NCC

The restrictor must:

Limit the maximum opening to 125 mm or less in its restricted state
Have a release mechanism that requires a deliberate two-step action (not just a single button press)
Be complementary to (not the primary) means of operation: the window must still be operable by adults
Comply with AS 5203:2016 impact and durability tests

Common restrictor designs:

Cable restrictor: cable attached to sash and frame; limits opening; releases by detaching the cable (with key or two-finger pinch)
Scissor restrictor: linked-arm device; limits opening; releases via lever
Fixed bar / dowel: removable bar limiting opening; release by removing the bar
Window grille / screen: permanent grille that meets the 125 mm rule structurally

The restrictor is NOT the same as a fly screen. A fly screen does not restrict the opening; it just keeps insects out. Some products combine restrictor and screen, but a generic fly screen alone does not satisfy AS 5203.

Window types and their hardware

Different window types use different hardware:

Sliding window (horizontal sliding, sash sliding)

Sash slides horizontally on track. Volume residential in Australia.

Hardware	Examples
Latch / lock	Whitco DL series sash lock; cam lock; positive-locking sash lock
Restrictor	Cable restrictor across the sash track
Operator	Pull handle on the sash; sliding action

Awning window (top-hinged, opens outward)

Top of sash hinged; bottom swings out.

Hardware	Examples
Friction stay (casement gear)	Roto, Doric, Maco friction hinges
Cam lock or shoot bolt	Single lever lock; auto-engage shoot bolt
Restrictor	Limit pin on the friction stay limits travel

Casement window (side-hinged, opens outward)

Side hinged; swings out from one side.

Hardware	Examples
Friction stay	Maco, Roto; provides movement and holds open
Lever lock	Multipoint at sash edge engaging frame
Restrictor	Limit pin on stay or cable restrictor

Double-hung sash window (vertical sliding)

Two sashes slide vertically.

Hardware	Examples
Sash balance	Spring or cord-and-weight balances each sash
Cam lock	Top-rail sash lock
Stay / restrictor	Sash limiter at top of bottom sash

Tilt-and-turn window (premium uPVC/aluminium)

Sash can tilt inward at top (ventilation) or swing inward fully (cleaning).

Hardware	Examples
Roto NT / Maco MULTI gearing	Internal corner-drive multipoint mechanism
Lever handle	Single lever rotates to select tilt/turn/closed
Restrictor	Tilt mode restricts top opening; built-in

Bi-fold window (concertina)

Multiple sashes fold together.

Hardware	Examples
Bi-fold runner / hardware kit	Centor, Brio, Logikhaus
Multipoint lock	Engages all sashes simultaneously
Restrictor	Hardware-specific; check product compliance

Australian brands

Brand	Range	Where used
Whitco (Allegion / DUlock)	Sliding window locks, sash locks, restrictors; the dominant Australian brand	Volume residential
Doric	Window and door hardware, friction stays	National
Maco (Austrian)	Premium tilt-and-turn, casement gear	uPVC and thermally-broken aluminium premium
Roto Frank (German)	Premium tilt-and-turn, casement gear	Premium European-style windows
Pryda (Multinail)	Standard residential restrictors and locks	Volume residential
Logikhaus	Premium European hardware integration	Specifier-led, uPVC
Centor	Bi-fold and stacking door hardware (with overlap into windows)	Premium
Brio	Sliding and pivot specialist	Premium
AGB	Italian premium concealed hardware	Premium specifier

For volume residential aluminium-framed windows: Whitco for sliding, Doric for awning and casement gear. For premium uPVC or thermally-broken aluminium: Maco or Roto Frank. For bi-fold doors and large bi-fold windows: Brio, Centor, or Logikhaus.

Hardware materials and corrosion

Window hardware in residential coastal locations (within 1 km of breaking surf) needs corrosion-resistant materials. The standard materials and their environments:

Material	Where used
Zinc-plated steel	Internal, dry, non-coastal
Chrome-plated steel	Internal volume residential
Stainless 304	Most internal and inland residential
Stainless 316	Coastal exterior; salt-spray exposure
Anodised aluminium	Some operators on aluminium windows
Brass	Heritage and decorative; not for coastal

Galvanic corrosion: mixing aluminium window frame with steel hardware in a coastal property accelerates corrosion of both metals. Specify stainless 316 hardware throughout in coastal exterior.

Common defects and on-site issues

Missing restrictor on upper-storey bedroom window: NCC compliance failure and child-safety issue. Restrictors must be on every Class 1/2 window 2 m+ above surface below with opening capable of >125 mm.
Restrictor with single-step release (a flip-up bar with no secondary catch): non-compliant with AS 5203’s two-step requirement. The release must require two deliberate actions.
Fly screen treated as restrictor: a fly screen is not a restrictor unless specifically tested and certified to AS 5203.
Galvanic corrosion in coastal property: zinc-plated or chrome-plated hardware in salt-spray fails within years. Specify stainless 316.
Friction stay over-tightened or under-tightened: window doesn’t stay open OR doesn’t fully close. Adjust the friction screw on the stay.
Sash lock cam misaligned: lock doesn’t engage cleanly. Adjust strike plate or cam height.
Cord-and-weight sash balance failed: bottom sash drops to the sill. Re-cord or replace with spring balance.
Bi-fold sash binding during operation: hardware out of square; adjust roller heights or replace damaged carrier.
Lock cylinder seized in coastal exposure: salt corrodes the cylinder pins. Specify stainless 316 lock body or specifically marine-rated lock.
Restrictor key lost (and homeowner can’t open in fire emergency): provide spare keys with the building handover; for fire-egress windows, use cable restrictors with pull-release rather than keyed.

Pricing (2026 indicative, ex-GST, supply only, per unit)

Item	Indicative cost
Whitco sash lock (sliding window)	$20-45
Whitco cable restrictor (AS 5203 compliant)	$35-75
Cam handle for awning/casement	$25-65
Maco friction stay (premium)	$60-140
Roto NT tilt-and-turn gear kit (per window)	$180-360
Bi-fold multipoint lock (Centor)	$250-540
Sash balance (spring, per sash)	$35-75
Stainless 316 premium for coastal exposure	+50-150% over standard

For a typical residential window order, hardware adds approximately $80-200 per opening on top of the frame and glazing supply.

Standards and references

Standards Australia, AS 2047:2014 Windows and external glazed doors in buildings. https://store.standards.org.au (verified 2026-05-13).
Standards Australia, AS 5203:2016 Protection of openable windows in buildings. https://store.standards.org.au (verified 2026-05-13).
Standards Australia, AS 4145.2:2008 Mechanical locks for doors used in buildings. https://store.standards.org.au (verified 2026-05-13).
Australian Building Codes Board, NCC 2022 ABCB Housing Provisions Part 11 (Safe movement and access). https://ncc.abcb.gov.au/editions/ncc-2022/adopted/housing-provisions (verified 2026-05-13).