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.

BS EN Certification: The Heritage Gold Standard

For the architect and trade professional, BS EN certification is the only proof of quality that matters. These certificates are your guarantee that SlimLite™ will deliver the performance we promise. Our certification protects your reputation and your client’s investment.

When you speak to us, you are speaking to the founding authority in heritage glazing, backed by decades of independently verified data.

Frequently Asked Questions

Understanding certification standards helps trade professionals make informed decisions. Here we address common questions about our BS EN compliance and what it means for your projects.

Request Your Technical Quote

Contact our knowledgeable team today to discuss specifications, performance requirements, and obtain competitive pricing for your project.

glass panels

Industry-Leading Certification Standards

SlimLite™ holds the most comprehensive BS EN 1279 certification in the UK heritage sector. This commitment to technical specification is what separates us from the “cookie-cutter” manufacturers.

Our BS EN 1279 certification includes:

  • Part 1: Materials and Tolerances
  • Part 2: Long Term Test Method and Requirements for Moisture Penetration
  • Part 3: Long Term Test Method and Requirements for Gas Leakage Rate
  • Part 4: Edge Seal Durability
  • Part 5: Product Evaluation and Compliance
  • Part 6: Factory Production Control

Exceptional BS EN 1279 Compliance

SlimLite™ is one of only two organisations in the UK to hold both Part 2 and Part 3 certification for heritage sightline units. While most companies stop at the basics, we achieve the gold standard.

Part 2 proves our seals will not fail; Part 3 proves our gas will not leak. This is the only way to guarantee long-term durability in a slim unit.

sliding sash windows
person using clipboard

What True Certification Means

BS EN 1279 is a rigorous testing protocol, not a suggestion. Achieving it requires a total commitment to quality management and factory control.

For the trade professional, this means the peace of mind that comes with knowing your supplier is operating at the absolute peak of the construction industry.

 

"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