Specialist Service
New Timber Windows
Bespoke manufacture and supply of high-performance timber sash and casement windows combining traditional aesthetics with modern standards.
Technical Overview
Scope & Methodology
Where historic windows are beyond viable repair, or where modern thermal standards require high-performance units, Velziyn manufactures and supplies bespoke timber sash and casement windows. All options meet PAS24 security standards.
Key Technical Aspects
Selected timber options: European softwood, hardwood, and Accoya
All sash and casement options tested and compliant with PAS24
Architectural profile matching for sightlines, meeting rails, and historic horns
Configurations including open-out, open-in, and French casements
Sash Window Options
Standard Sash
PAS24Glazing: Argon double glazing
Glazing Bars: Applied glazing bars
Operation: Cords & weights or modern spiral spring balances
Classic Sash
PAS24Glazing: Krypton slim double glazing
Glazing Bars: Solid glazing bars
Operation: Cords & weights
Suitable for listed properties subject to permissions
Future Sash
PAS24Glazing: 8.3mm vacuum glazing
Glazing Bars: Applied glazing bars
U-Value: 1.2 – 1.1 W/m²K
Suitable for listed properties subject to planning
Triple Glazed Sash
PAS24Glazing: 40–48mm sealed triple glazing
Glazing Bars: Applied / solid options
U-Value: Whole-window U-value 1.1 W/m²K
Operation: Cords & weights
Casement Window Options
Standard Casement
PAS24Glazing: Argon double glazing
Glazing Bars: Applied glazing bars
Classic Casement
PAS24Glazing: Krypton slim double glazing
Glazing Bars: Solid glazing bars
Subject to local permissions
Future Casement
PAS24Glazing: 8.3mm vacuum glazing
Glazing Bars: Applied glazing bars
U-Value: 1.2 – 1.1 W/m²K
Suitable for listed properties subject to planning
Project Consultation
Specify This Service
Discuss project drawings, listed building conditions, or schedule a formal site inspection with our surveyors.
Request Itemised QuoteCHAS Accredited Contractor
Full RAMS & Insurance
Start Your Project
Have a Heritage Window Project?
Whether you have a single window or a large programme of works, our team will provide a professional, detailed response to your enquiry.