Masterframe Sash Windows

Premium uPVC Windows
in Essex and Suffolk

We are proud to partner with Masterframe — the UK’s specialist sash-window manufacturer dedicated solely to crafting authentic, high-performance vertical-sliding windows. With more than 30 years of expertise, Masterframe combines the elegance of traditional timber-style sash windows with the precision of modern engineering. Every window is crafted in Britain, blending period detail with exceptional thermal performance, security and long-lasting quality — expertly installed by Halstead Glass.

Explore the rangeView the inspiration gallery

Authentic Timber Appearance.
‍Masterframe’s sash windows replicate the fine detailing of classic timber joinery — from deep putty lines to woodgrain finishes and true mechanical joints.

Made in Britain.
‍Designed, engineered and manufactured in the UK with meticulous craftsmanship and full traceability across every component.

Security You Can Trust.
‍Every sash window meets or exceeds PAS 24 and Secured by Design standards, offering peace of mind with reinforced frames and robust locking systems.

Exceptional Energy Efficiency.
‍With multi-chambered frames, warm-edge spacer bars and A+ energy ratings, they deliver outstanding insulation without compromising heritage style.

FINEO^® Glazing

Available only in the Vintage Collection, FINEO® vacuum glazing delivers excellent thermal performance in a slim 10 mm profile, preserving heritage aesthetics and surpassing modern double glazing standards.

Locking Cam Catches

With precision-engineered locking cam catches, securing sashes with a heritage look. Available in premium finishes, they offer period styling and modern PAS 24-rated security, ensuring both safety and elegance.

Outerframe Design

Replicating classic timber window mouldings the staff bead outerframe exclusive to the Vintage and Heritage collections enhances aesthetics and provides a seamless, traditional appearance.

Georgi Clips^®

The Georgi Clips^® system conceals glazing bar fixings, providing a smooth finish and genuine Georgian-bar appearance without visible joints, achieving the timber look without the maintenance.

Discover the Range

Masterframe’s brings together three exceptional sash window ranges — each designed for a different level of authenticity, performance and detail.

Heritage Sash Windows

Mid-range Versatility

Blending period charm with modern functionality, offering refined details and advanced design for both traditional and contemporary homes.

Featuring authentic putty line details and offering staff bead options for both interior and exterior frames, this collection merges classic elegance with modern practicality.

Joint: Timberweld^®
Energy Rating: Up to A+
Guarantee: 10 Years
Spring Balance: Torso II
Frame: Coupled
Cill: PVC-U 31mm
Glazing: 24mm Argon DGU
Furniture Colours: Champagne Gold, Chrome, Polished Bronze or Satin Chrome
Hardware Options: Full Range

Authentic Sash Windows

Entry Level Heritage Style

The Authentic Collection provides the classic look of sash windows. Ideal for those who want traditional style at a more affordable price.

The Authentic Collection comes with features such as original putty line details, deep bottom rail, run-through horns and a white wood foil finish as standard.

Joint: Timberweld^®
Energy Rating: Up to A
Guarantee: 10 Years
Spring Balance: Ultralift
Frame: Coupled
Cill: PVC-U 31mm
Glazing: 24mm Argon DGU
Furniture Colours: Gold, Chrome, Bronze, Satin Silver or White
Hardware Options: Selected Finishes

Vintage Sash Windows

Flagship Model for Conservation Projects

The flag-ship product, epitomising authenticity and craftsmanship. Perfect for heritage and conservation areas, it combines traditional timber aesthetics with modern efficiency and security standards.

Ideal for those who appreciate fine details like chamfered sashes and staff bead options. It features a deep bottom rail, deep cill, run-through horns, and a white foil finish.