Windows

What Is a Casement Window?

A casement window is a hinged window that opens outward, usually with a crank handle.

Understanding Casement Windows

Casement Window: A casement window is a hinged window that opens outward, usually with a crank handle.

Published: June 4, 2026 Reviewed: June 4, 2026 Updated: June 4, 2026 By Exterior Echelon

A casement window is hinged on one side and opens outward. Many casement windows use a crank handle to open and close the sash.

Why It Matters

Casement windows can provide strong ventilation and a tight seal when closed. They are common in areas where homeowners want airflow, clear views, or easier operation over counters and other hard-to-reach spaces.

Common Problems

Common issues include worn crank hardware, bent hinges, sashes that do not close tightly, failed seals, damaged screens, and exterior water-management problems around the opening.

Building Codes & Industry Standards

Casement windows should be installed according to manufacturer instructions, local energy requirements, safety glass requirements where needed, and proper flashing practices.

Exterior Echelon Notes

Exterior Echelon reviews casement window operation, exterior trim, flashing, and surrounding wall details because hardware performance and water management both matter.

Casement window opened outward
Casement windows are hinged and commonly open outward with a crank.

Related Terms

Continue learning with connected glossary definitions.

Awning Window

Windows

An awning window is a hinged window that opens outward from the bottom, with the hinge at the top.

Double Hung Window

Windows

A double hung window is a window with both an upper sash and lower sash that can move for ventilation.

Picture Window

Windows

A picture window is a fixed window that does not open and is often used for larger views and natural light.

Window Flashing

Windows

Window flashing is the water-management detail around a window opening that helps direct water away from the wall assembly.

Air Barrier

Exterior Weather Barriers

An air barrier is a material or system intended to limit uncontrolled air movement through a building assembly.

Building Envelope

Exterior Construction

The building envelope is the collection of exterior systems that separate the inside of a home from outdoor weather.

Glossary Note

This glossary is provided for general homeowner education. Actual roofing, siding, gutter, window, and exterior remodeling conditions should be evaluated by a qualified contractor before making repair, replacement, or insurance claim decisions.

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