Windows

What Is a Single Hung Window?

A single hung window is a window with a lower sash that moves up and down while the upper sash stays fixed.

Understanding Single Hung Windows

Single Hung Window: A single hung window is a window with a lower sash that moves up and down while the upper sash stays fixed.

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

A single hung window is a window with two sashes where the lower sash opens and the upper sash stays fixed.

Why It Matters

Single hung windows are common in residential construction and can be a straightforward replacement option. Understanding the style helps homeowners compare ventilation, cleaning access, cost, and appearance.

Common Problems

Common issues include worn balances, stuck lower sashes, failed seals, drafts, damaged screens, and poor flashing around the window opening.

Building Codes & Industry Standards

Single hung windows should be installed according to the window manufacturer instructions, applicable energy requirements, safety glass rules where required, and wall flashing requirements.

Exterior Echelon Notes

Exterior Echelon evaluates window style, operation, flashing, trim, and surrounding siding details so the finished installation performs as part of the full exterior system.

Single hung window on a residential exterior
Single hung windows have one operable sash and one fixed sash.

Related Terms

Continue learning with connected glossary definitions.

Double Hung Window

Windows

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

Window Flashing

Windows

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

Picture Window

Windows

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

Sliding Window

Windows

A sliding window is a window with one or more sashes that move horizontally along a track.

Air Barrier

Exterior Weather Barriers

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

Awning Window

Windows

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

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.

Frequently Asked Questions

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