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.
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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.
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.
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.
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.
With multi-chambered frames, warm-edge spacer bars and A+ energy ratings, they deliver outstanding insulation without compromising heritage style.
Continuous Horn Detail
Masterframe windows feature continuous horns, a hallmark of traditional sash windows. These horns, part of the sash, provide strength and period authenticity, enhancing the collections' original charm.
Timberweld®
Masterframe's exclusive Timberweld® technology creates 90° joints that replicate traditional timber joinery, offering an authentic appearance with enhanced strength and durability. These joints are a hallmark of Masterframe sash windows.
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.
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 Classic Collection
Masterframe’sogether 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.
Featuring authentic putty line details and offering staff bead options for both interior and exterior frames, this collection merges classic elegance with modern practicality.
- Guarantee: 10 Years
- Joint: Timberweld®
- Energy Rating: A
- Spring Balance: Torso II
- Frame: Coupled
- Cill: PVC-U 31mm
- Glazing: 24mm Argon DGU
- Furniture Colours: Champagne Gold, Chrome, Polished Bronze or Satin Chrome.
Bespoke to Masterframe - 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.
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.
- Guarantee: 10 Years
- Joint: Timberweld®
- Energy Rating: A
- 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.
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.
- Guarantee: 10 Years
- Joint: Timberweld® Deep-cut Mechanical
- Energy Rating: A
- Spring Balance: Torso II
- Frame: Slim Integral Mullion
- Cill: GRP 55mm
- Glazing: Premium FINEO® Option Available
- Furniture Colours: Champagne Gold, Chrome, Polished Bronze or Satin Chrome.
Bespoke to Masterframe - Hardware Options: Full Premium Range
We're a family-run business established in 1989
Finance options are available to help with your purchase
Proud to be certified Origin and Evolution installers
Our products have industry leading guarantees
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