Welcome to Slenderpane

At Slenderpane® we manufacture slim glass units that allow the use of thermally efficient Slim Double Glazing where normally only single glazing would be allowed by planning and conservation officers. All our slim double glazed units comply with BSI Certification BS EN1279.

Slenderpane established 2011Comprising only top quality components, the high specification Slim Double Glazed Units (commonly known as slimlite or heritage units) have ultra slim sightlines that allow elegant, traditional fixed glazing bars to preserve the period character of the building, whether listed or within a conservation area.

Slim units are most commonly 11mm (4 x 4 x 3), 12mm (4 x 4 x 4) and 14mm (4 x 6 x 4) and sight lines are a standard 7mm or 6mm with the Heritage spacer. For a quote please complete our Quick Quote form.Handmade glazed units

BSI Certification

Slenderpane insulated glass units meet BSI standard BS EN 1279-3:2002. Please view the attached certificates for the Insulated Glass Units and Gas Specification.

Slenderpane Brochure

Please download our brochure.Slenderpane Brochure

Offering a competitive, friendly and efficient service, all our slim double glazed units are made in Britain in our Haddenham workshop in Buckinghamshire.

We supply nationwide to joiners, construction companies, architects, private clients and indeed anybody in the industry that cares about aesthetics and the preservation of our heritage and buildings.


Slenderpane makes a donation to the children’s charity Helen & Douglas House.

For a Quick Quote please complete the Quick Quote Form which is quick and easy with helpful advice throughout.