Are casement windows more energy efficient than double-hung?

Yes, casement windows have a compression seal that creates a tighter seal than the sliding seals on double-hung windows, resulting in less air infiltration.

Can casement windows be used for egress?

Yes, casement windows can meet egress requirements when properly sized. The full opening of the sash often makes it easier to meet the 5.7 square foot egress requirement.

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Doors & Windows

Windows

$200-$900+ per window

Casement Windows (2026)

Prepared by Lumberama's Building Materials Team

|Last updated May 15, 2026|Sources & methodology

Casement windows are hinged on one side and crank open outward, providing the tightest seal of any operable window type and maximum ventilation since the entire sash opens. They are ideal for hard-to-reach locations like above kitchen sinks or countertops. The compression seal design makes them the most energy-efficient operable window.

Key Features

Full-sash ventilation
Tightest seal when closed
Crank handle operation
Excellent for hard-to-reach spots
Multi-point locking system

Specifications

Common Widths: 18-36 inches | Common Heights: 24-72 inches | Glass Type: Double-pane Low-E argon | Frame Materials: Vinyl

wood

fiberglass | U-Factor: 0.22-0.30

Applications

Above kitchen sinks
Above countertops
Bathrooms
Basements
Any location needing maximum ventilation

Installation Overview

Install in rough opening with proper flashing tape sequence. Level and plumb the frame, shim at hinges and operator, then secure. Insulate the perimeter gap and apply interior and exterior trim.

Pros & Cons

Pros

✓ Best energy efficiency of operable windows
✓ Full opening for maximum ventilation
✓ Easy crank operation
✓ Excellent for hard-to-reach areas

Cons

✗ Cannot use window air conditioners
✗ Crank mechanisms can wear out
✗ Sash protrudes when open
✗ Limited maximum width

Top Brands

Andersen

Pella

Marvin

JELD-WEN

Code Requirements

Must meet energy code U-factor and SHGC requirements. Egress requirements apply for bedrooms. Must not open into walkways or public paths in some jurisdictions.

Buying Tips

Choose casement windows for above sinks and counters where reaching a double-hung would be difficult. Verify the sash will not obstruct walkways or decks when open. Fiberglass frames offer the best durability.