Box Sash Windows

Traditional in appearance yet modern in performance, our box sash windows combine timeless character with secure and energy-efficient design. At Wirral Double Glazing, we offer high-quality uPVC sash windows, made to measure and installed by experienced professionals.

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What Are Box Sash Windows?

Also known as vertical sliding sash windows, these classic designs feature two vertically sliding panels within a frame. Perfect for heritage homes and conservation areas, they offer the elegance of traditional joinery with the reliability of modern materials and construction methods.

Fully Customisable Options

All of our sash windows are custom-made to match your home’s design and performance requirements.

Colour: Available in any RAL colour
Materials: uPVC
Hardware Options: Pole eyes, tilt knobs, sash lifts, sash locks, D-handles, and travel restrictors
Glazing Options: Double glazing, triple glazing, toughened glass, Georgian bars
Optional Extras: Plant-on sash horns, run-through sash horns, fire egress configurations

Secure & Energy Efficient

Our box sash windows are designed to deliver exceptional protection and thermal performance:

Internal security bar included with uPVC frames to prevent forced lifting
Multi-point locking mechanisms
Options for PAS 24 and Secured by Design compliance
U-values from 1.4W/m²K depending on glazing
Minimum B rating for thermal efficiency
Compliant with Part Q and current Building Regulations
FENSA certification included where applicable

Why Choose Wirral Double Glazing for Your Windows?

Experienced Local Fitters

With decades of glazing experience across Wirral, our trusted team ensures a clean, professional fit every time.

Bespoke Finishes

Your windows are made to measure with custom detailing, colour, and hardware options that match your home.

Fully Certified

All our installations are backed by FENSA certification and meet the latest security and insulation standards.

Respect for Traditional Properties

We understand the needs of heritage homes and conservation areas. Our box sash windows are crafted to preserve period charm while meeting modern performance and planning requirements.