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Premium Sash Windows for Authentic Home Renovations
Masterframe Windows is a specialist in the design and manufacture of high-quality sash windows, combining traditional aesthetics with modern materials and technology. With over three decades of experience, we have established ourselves as a leader in the industry, producing windows that replicate the elegance of timber while offering superior durability and low maintenance. Our Bygone Collection, featuring Symphony, Harmony, and Melody ranges, is crafted to meet the exacting standards of conservation areas and period properties, ensuring authenticity in design and performance. We employ patented Timberweld technology to create seamless joints that mirror the appearance of traditional timber craftsmanship, while our FINEO vacuum-insulated glazing provides exceptional thermal efficiency.

Our commitment to quality is underscored by rigorous testing, BBA approval, and a 12-year guarantee, reflecting our confidence in both product and installation standards. Our team of Master Installers, selected for their expertise and dedication, ensures every project is completed to the highest specification, with a focus on customer satisfaction and long-term value. We pride ourselves on transparency, offering detailed consultations and tailored solutions to meet individual property needs, whether for residential or commercial applications.
Services
Sash Windows uPVC Windows Timber Alternative Windows Conservation-Approved Windows FINEO Glazing
Highlights and features
  • We have over 30 years of experience in specialist sash window manufacturing.
  • Our products are BBA-approved and tested for a lifecycle exceeding 30 years.
  • We use patented Timberweld technology for authentic timber-look joints.
  • Our Master Installers undergo rigorous training and adhere to British standards.
  • We offer an industry-leading 12-year guarantee on products and installation.
Associations and certifications
  • British Board of Agrment
  • ISO 9001
  • Secured by Design
What people say
Premium range Secure and energy-efficient Perfect match for old ones Excellent service and installation Transform the property
Services
Symphony Sash Windows
Symphony Sash Windows combine a super-slim 39mm mid-rail with continuous run-through horns for unparalleled authenticity. Designed for period properties, they feature deep bottom rails and Georgian bars, offering a seamless blend of traditional aesthetics and modern durability. Available in a 1.2U-value for enhanced thermal efficiency.
Timberweld Technology
Timberweld Technology creates sealed PVC-U joints that replicate mortise-and-tenon timber butt-joints. This method ensures watertight durability while maintaining the visual appeal of handcrafted timber, ideal for conservation areas requiring authentic period detailing and long-term performance.
FINEO Glazing
FINEO Glazing uses vacuum-insulated glass to deliver triple-glazing performance in a 10mm profile. This technology reduces heat loss and noise pollution while maintaining slim sightlines, perfect for heritage properties needing modern energy efficiency without compromising design integrity.
Conservation-Approved Windows
Our conservation-approved windows meet strict planning requirements for listed buildings and conservation areas. They replicate traditional timber designs using uPVC for low maintenance, ensuring compliance with English Heritage guidelines and approval from local authorities.
Master Installer Network
Masterframe Windows's approved installers undergo NVQ-level training to ensure precise fitting of sash windows. This network guarantees quality workmanship, adherence to British standards, and a 12-year guarantee covering both product and installation for complete customer confidence.
Questions
What makes Masterframe Windows sash windows suitable for conservation areas?
Our windows replicate traditional timber designs with precise detailing, approved by conservation officers for period properties.
Do Masterframe Windows windows come with a guarantee?
Yes, we offer a 12-year guarantee covering product durability and installation quality.
Can I customise the colour of my sash windows?
We offer a full colour-matching service to all leading paint brands for bespoke finishes.
How energy-efficient are Masterframe Windows's sash windows?
Our windows achieve A-rated energy efficiency with optional FINEO vacuum glazing for 1.2U-values.
Are Masterframe Windows installers certified professionals?
Yes, our Master Installers undergo NVQ training and adhere to British standards for quality assurance.
What is Timberweld technology?
Timberweld creates sealed PVC-U joints that mimic traditional timber craftsmanship for authentic aesthetics and durability.