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.

Complete Window Systems: Our Commitment to Your Legacy

For those who entrust us with their complete window and door solutions, we provide a definitive 10-year maintenance-free guarantee. This comprehensive warranty is an ironclad promise covering glazing, joinery, timber, and our expert installation.

This decade-long commitment is born from absolute confidence in our craftsmanship. Whether you own a grand sash-windowed estate or a listed cottage, every detail of our work is protected.

Peace of Mind for Your Heritage Windows

Investing in a listed building is a significant undertaking; you deserve a partner who cares as much about the result as you do. Our warranty is your shield, providing total assurance in both the physical product and the hands that install it.

Our guarantee covers:

  • Defects in glass unit manufacturing

  • Master-level installation standards

  • Full compliance with English building regulations

  • Protection against internal unit condensation

  • Guaranteed thermal and energy performance

heritage flush window

Trade Supply: The 5-Year Standard

Our trade-supply units are backed by a robust 5-year guarantee against manufacturing failure. We protect the integrity of the seal, ensuring your project is immune to the internal condensation that plagues inferior products and compromises energy ratings.

Your investment is secured from the moment of installation.

LandVac Vacuum Glazing: A 25-Year Legacy

Our LandVac vacuum glazing carries an extraordinary 25-year guarantee – the highest level of assurance in the heritage glazing market. This reflects the world-class manufacturing and indestructible energy performance of vacuum technology.

This is decades of protection against heat loss, ensuring your heating costs remain low for a generation.

double front doors

Request Your Technical Quote

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

"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

Frequently Asked Questions 

Here are answers to common questions about our double glazing guarantees.