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Slenderpane – Slimline Heritage Double Glazing

At Slenderpane® we manufacture slim glass units, for trade customers only, that allow the use of thermally efficient Slim Double Glazing where only single glazing would normally be allowed by planning and conservation officers.

Comprising 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 sightlines are a standard 7mm or 6mm with the Heritage spacer.

For a quote please complete our Quick Quote form.

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

Slenderpane has been providing slim double glazed units since 2011 and as a leading UK provider take the industry standards extremely seriously. Working with Edgetech, who themselves are the leading manufacturer of warm edge technology, our Heritage Sealed Units have been tested and achieved full accreditation in compliance with EN1279 parts 2 & 3.

We have certificates for our Insulated Glass Units and Gas Specification, that are available on request or can be viewed on the website.

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

Slenderpane is proud to support the Florence Nightingale Hospice charity.

Florence Nightingale Hospice Charity
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Get A Glazing Quick Quote - TRADE ONLY

Complete and send our online "Quick Quote Form" and we will get back to you within 24 hours.

Mr Hothersall, Somerset

"I thought I would get in touch following installation of your glass by Chris of Sash Window Doctor, Portland, Devon. We never expected huge differences in temperature with this type of slim glazed units so only gave Chris a couple of windows to see if your website claims stand up. The honest answer is yes!"

"I’ve been very impressed so far and with a 7mm sight line, your 10 year guarantee it gives me confidence, so much so I’ve asked him to do several more windows. I’m sure you will look after him, and I’m grateful that both he and your company exist to keep older buildings going and not simply rip out perfectly good wooden frames etc. well done!"

David George-Powell, Buckinghamshire

"I have received the units . Just like to say I am very pleased with the quality of your units they are very well made."

"I have seen a lot of units , I have been around the glass industry all my life. My dad owned two glass shops and was in the business for 61 years."

"The packing crate was a bit damaged but I think there is no damage . We used to put a glass fragile sticker on , the delivery drivers seem to understand that better. He thought it was a machine. Thanks for your speedy service hope to deal with you in the future."

Bobby, Berkshire

"Thank you for the glass that was delivered today. Can I just say your service is amazing and the packaging ezxeptional. Please pass my thanks to Ralph also."

Handmade in Our Workshop

All Slenderpane’s slim double glazed units are handmade in our Haddenham workshop in Buckinghamshire.

We use the latest technology to ensure our consistent high quality with an attention to detail throughout all our products.

We are producing toughened glass for our own units down to a size of 120mm x 120mm in our workshop.


Handmade slim glazed units

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Opening Hours

Monday - Thursday: 8.30am - 5.00pm
Friday: 8.30am - 4.00pm
Saturday, Sunday & Bank Holidays: Closed

Slenderpane's Workshop Showroom visits for Trade customers are by appointment only.

We are proud to be sponsors of the Florence Nightingale Hospice Charity

Florence Nightingale Hospice Charity

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