I am...

Call 01535 603399

The Heritage Glazing Authority

We invented ultra-thin double glazing for listed buildings.

Complete Conservation Service

From planning applications to final installation, we're with you.

Unmatched Certification Standards

One of only two UK companies holding full BS EN 1279 Parts 1-6 certification.

Authentic Slim Sightlines

Preserve architectural integrity with 6mm sightlines – the slimmest available.

Performance You Can Specify

Request a Consultation

SlimLite is the trade professional’s choice for heritage double glazing. Our units are certified to BS EN1279 – including the rare parts 2 and 3 compliance – giving you and your clients complete confidence in every installation. With short lead times, competitive pricing, and a dedicated trade support team, SlimLite makes heritage glazing straightforward.

Request a Consultation
georgian window

Heritage Windows

Ultra-thin glazing that preserves historic charm while delivering modern energy efficiency.

Product Information

double front door

Heritage Doors

SlimLite™ glazing keeps heritage doors warm, clear, and true to their original design.

Product Information

white georgian windows

Double Glazed Units

SlimLite™ double glazing keeps your home warm, energy-efficient, and quiet without compromising style.

Product Information

vacuum glazing

LandVac Vacuum Glazing

LandVac vacuum glazing offers maximum insulation in slim units, perfect for heritage or modern windows.

Product Information

construction worker looking at blueprints

Technical Specifications and Performance Data

Seeking comprehensive specifications for our slimline double glazing systems? Our technical section presents detailed information on thermal characteristics, glass compositions, spacer materials, and installation protocols. Whether evaluating alternatives to secondary glazing or clarifying U-values for planning submissions, we've put together everything required to make confident decisions for your period property.

View Technical MaterialsBrowse Resources

Your Path to Exceptional Heritage Windows

We transform the intricate process of upgrading heritage windows into a seamless experience. From initial consultation through to installation and ongoing aftercare, our specialist team champions your project at every stage.
contact icon

Consultation and Assessment

Our heritage experts visit your property or project site to evaluate existing windows, understand your vision, and recommend the best approach. We navigate conservation area requirements and support planning application preparation with authority.

design icon

Bespoke Design and Quotation

No two heritage properties share the same story. We develop comprehensive proposals detailing how our slim units will complement your frames, glass specifications and sight lines. Expect transparent pricing and honest project timelines.

glazed icon

Precision In-House Manufacturing

Your bespoke glass units are crafted to exacting specifications at our dedicated facility. Every unit undergoes stringent quality verification, confirming sealant integrity, gas retention, and full BS EN 1279 compliance before dispatch.

heart hand icon

Expert Installation and Aftercare

Whether collaborating with your chosen installer or our approved network, we deliver comprehensive support. All installations carry guarantees against failures, with our team available for ongoing guidance and maintenance advice.

Request Quote

"Great service along with a quality product, also the best advice on the different types of the slimlite range."

Martin

via Trustpilot

"Great high quality product, does exactly what it is supposed to i.e. significant improvement in thermal insulation and noise reduction. I had an issue with the order which was immediately resolved. Would thoroughly recommend."

Duncan

via Trustpilot

"Experts in their field, a well run family business. Pleasure to deal with. Good communicators and they produce a quality product."

James Sunderland

via Trustpilot

Browse all reviews