Slimlite Double Glazing

Slimlite Double Glazing for Period and Listed Properties

Discreet Slimlite double glazing designed for traditional sash windows

When it comes to upgrading sash windows in period or listed properties, finding a glazing solution that delivers energy efficiency without compromising aesthetics can be a challenge. At Cavendish & Cole, we specialise in Slimlite double glazing—an ultra-slim, heritage-approved glazing system ideal for Victorian and Georgian sash windows.

Slimlite is the go-to choice for homeowners, conservation officers, and architects alike. It preserves the appearance of traditional single glazing while offering the comfort, insulation, and efficiency of modern glass technology.

What is Slimlite Double Glazing?

Slimlite is a specially engineered double glazed unit—typically between 10mm and 14mm in total thickness—designed for traditional timber windows where standard double glazing would be too bulky. Each unit contains a narrow cavity filled with insulating gas, allowing it to perform like a modern unit while maintaining the fine sightlines of original sash windows.

Perfect for:

  • Listed buildings and homes in conservation areas
  • Properties with narrow glazing bars and delicate sash profiles
  • Homeowners seeking single to double glazed upgrades
  • Those wanting to retain historic joinery while improving efficiency
  • Why Choose Slimlite?
  • Ultra-slim profile fits into traditional sash frames
  • Low-E glass and inert gas fill for thermal performance
  • Visually similar to single glazing
  • Accepted by many conservation officers and local authorities
  • Compatible with timber types like Accoya, hardwood, and softwood
  • Reduced heat loss, draughts, and noise
  • Helps prevent condensation and improves comfort year-round
At Cavendish & Cole, we work closely with planning departments and heritage bodies, ensuring our Slimlite installations meet both aesthetic and regulatory requirements.

Ideal for Upgrades and New Joinery

Whether you’re installing bespoke sash windows from our joinery workshop or looking to upgrade your existing windows with Slimlite double glazing, we tailor each solution to your property and its requirements.

We offer:

  • Complete new sash windows with Slimlite glazing
  • Single to double glazed upgrades using Slimlite in original sashes
  • Full repair and restoration of sash boxes, cords, and hardware
  • Custom glazing options including obscure, acoustic, and toughened Slimlite glass
All work is carried out by our experienced, in-house team—never subcontracted—so you can expect consistent craftsmanship and attention to detail.

Trusted by Heritage Property Owners Across Sussex, Kent & Surrey

Cavendish & Cole is a trusted name in traditional window joinery, known for our sensitivity to heritage and our commitment to lasting quality. From small sash upgrades to full-house installations, we bring a rare combination of period knowledge and technical skill.

With every Slimlite project, we ensure:

  • Seamless finish with traditional putty glazing
  • Careful alignment with English Heritage and planning guidelines
  • Full support throughout the process, including planning advice if needed
  • Premium materials like Accoya timber and high-grade hardware
  • A final result that is warm, quiet, discreet—and made to last
  • Bring modern performance to your heritage home.

Ready to transform your home? Call us on 01273 282176 or email us here

Get in touch today for a free consultation. Let’s bring your vision to life—beautifully, traditionally, and made to last.
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