Slim Double Glazing for Sash Windows
Slim Glass manufactures high-quality slim double glazed units specifically for timber sash and casement windows, engineered to improve thermal and acoustic performance while preserving the original appearance and proportions of traditional timber box sash windows. These units are ideal for heritage, period and conservation projects where standard double glazing is too thick or visually intrusive.
Our sash glazing units are crafted to sit neatly behind the window rebate so that no spacer bar is visible, giving the appearance of a single pane from both inside and out.
Ultra Slim Profiles for Heritage Needs
We offer ultra-slim units from around 11 mm overall thickness, tailored to work within narrow sash profiles and glazing bars. This helps maintain the authentic sightlines and proportions essential for timber sash windows.
Enhanced Thermal & Acoustic Performance
All units are gas-filled using either Argon or Krypton and include low-emissivity (Low-E) glass to boost thermal performance, achieving significantly better U-values compared to single glazing, even in very slim form.
Quality Craftsmanship – Hand-finished units with attention to detail.
Expert Support – Proven experience working with sash window professionals and heritage projects.
Contact us today to discuss your requirements and request a bespoke quote.
What Makes Our Slim Sash Glazing Special?
Designed to Fit Behind Traditional RebatesOur sash glazing units are crafted to sit neatly behind the window rebate so that no spacer bar is visible, giving the appearance of a single pane from both inside and out.
Ultra Slim Profiles for Heritage Needs
We offer ultra-slim units from around 11 mm overall thickness, tailored to work within narrow sash profiles and glazing bars. This helps maintain the authentic sightlines and proportions essential for timber sash windows.
Enhanced Thermal & Acoustic Performance
All units are gas-filled using either Argon or Krypton and include low-emissivity (Low-E) glass to boost thermal performance, achieving significantly better U-values compared to single glazing, even in very slim form.
Typical Applications
These units are a great solution for:- Refurbishment of existing timber sash windows
- Restoration projects in conservation areas
- Period property upgrades where planning consent requires minimal visual change
- Projects where maintaining traditional sightlines is essential
Why Choose Slim Glass?
Manufactured to Order – Every sash unit is custom made to fit specific sash dimensions.Quality Craftsmanship – Hand-finished units with attention to detail.
Expert Support – Proven experience working with sash window professionals and heritage projects.
Get a Quote or Technical Support
If you’re specifying or ordering slim double glazed sash window units for a project, our technical team can help with measurements, performance specifications, and glass selection.Contact us today to discuss your requirements and request a bespoke quote.