A casement window is a side-hinged window that opens outward like a door, operated by a crank handle. This design allows for full top-to-bottom ventilation and unobstructed views. When closed, the sash presses tightly against the frame, providing excellent energy efficiency and security.
Side hinged design
Crank operation
Unobstructed views
Excellent ventilation
Tight seal when closed
Versatile style options
| Glass | 6mm double lowE+12Ar+6mm double lowE +12Ar+6mm clear glass | ||
| U-Factor(W/m2-K) | SHGC | VT | CR |
| 0.27 | 0.18 | 0.29 | 68 |
Casement Window | Visible Surface | Section Profile Thickness | Size Range | Glass Thickness | Maximum Load-Bearing | |
55 Series | Glass Sash | Wall Thickness | Frame Thickness | Width|Height(mm) | 5+9+5 | 48kg |
69.2mm | 1.4mm | 48.2mm | 850|1500 | |||
Boost the functionality, style, and performance of your casement windows with our premium selection of accessories.
Every casement window we deliver has passed a hands-on function check — from smooth opening and secure locking to hardware reliability.
We believe quality is in the details, and this simple demonstration reflects our commitment to ensuring you receive a product that performs flawlessly from day one.
| Feature | Casement Window | Sliding Window | Double-Hung Window |
|---|---|---|---|
| Operation | Side-hinged, opens outward with a crank | Slides horizontally along a track | Both sashes slide vertically |
| Ventilation | Excellent (full opening) | Moderate (half opening) | Good (top and bottom opening) |
| Energy Efficiency | High (tight compression seal) | Medium (looser weatherstripping) | Medium (sash gaps may leak) |
| Ease of Cleaning | Interior easy; exterior may require ladder | Panels can be lifted or tilted for cleaning | Most tilt in for easy cleaning |
| Best Used In | Kitchens, bedrooms, living rooms | Basements, side walls | Traditional homes, second floors |
| Security | Multi-point locking, very secure | Moderate (single latch) | Standard locks, varies by model |
Leaks or drafts
If you feel air coming through, the weatherstripping may be worn. Replacing it can quickly improve insulation and comfort.
Crank won’t move
A crank that’s jammed or broken often means the gear mechanism has failed. Swapping it for a new crank assembly typically solves the issue.
Foggy or cloudy glass
This means the seal between panes has failed, letting moisture in. You may need to replace the sash or glass unit to restore clarity and energy efficiency.
A casement window is hinged at the side and opens outward like a door, typically operated with a crank handle. This design allows for full top-to-bottom ventilation and provides an unobstructed view.
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