Business Details
15 Years
experience
Slim Double Glazing Units for Heritage Buildings
Slenderpane has been manufacturing high-quality slim double-glazed units since 2011, specialising in solutions for heritage and conservation projects. Our units combine thermal efficiency with traditional aesthetics, enabling compliance with planning regulations while preserving period character. We use advanced warm-edge technology and inert gases to achieve U-values between 0.9 and 1.9, meeting BSI standard BS EN 1279-3:2002. All products are handmade in our Haddenham workshop using components tested to EN1279 parts 2 & 3, with a 10-year warranty on most units. Our team collaborates with Edgetech, a leading warm-edge technology manufacturer, to ensure industry-leading performance.We supply nationwide to trade customers including joiners, architects, and conservation specialists. Our small toughening plant enables production of units as small as 100x100mm, addressing niche heritage requirements. Client testimonials highlight satisfaction with thermal improvements, sightline precision, and packaging quality. We operate a 24-hour quote turnaround system and maintain transparent delivery timelines, with annealed units typically dispatched within 4-5 days. As a community-focused business, we sponsor the Florence Nightingale Hospice Charity.
Services
Slim Double Glazing
Toughened Glass Units
Heritage Glazing
Acoustic Glazing
Leaded Glass Units
Krypton Gas Filling
Warm Edge Spacers
Custom Size Production
Conservation Glazing
Thermal Insulation
Details
- Year established: 2011
Highlights and features
- We offer BSI-certified units meeting BS EN 1279-3:2002 standards
- Our 10-year warranty covers most double-glazed units
- Handmade production in Haddenham since 2011 ensures quality control
- We manufacture toughened glass down to 100x100mm sizes
- Collaboration with Edgetech ensures warm-edge technology leadership
Associations and certifications
- BSI
What people say
Service is amazing
Quality of your units
10 year guarantee
Speedy service
Packaging exceptional
Services
Slim Double Glazing
Our slim double-glazed units maintain traditional aesthetics while improving thermal efficiency. With sightlines from 6-11mm, they meet conservation requirements and achieve U-values between 0.9 and 1.9. Each unit uses warm-edge spacers and inert gases for optimal performance.
Toughened Glass
We produce toughened glass units down to 100x100mm sizes, ideal for heritage applications requiring safety glazing. Our in-house toughening plant ensures quality control and 8-day production times for these specialist units.
Leaded Glass Units
Bespoke leaded glass units replicate historic designs while incorporating modern thermal benefits. Each unit maintains authentic appearance with 7mm sightlines and 10-year guarantees on both annealed and toughened variants.
Acoustic Glazing
Our units reduce sound transference while preserving visual authenticity. Using specialist gas fills and precise manufacturing tolerances, we achieve sound reduction performance alongside thermal efficiencies of 0.9-1.9 U-values.
Conservation Glazing
Designed for listed buildings and conservation areas, our glazing solutions balance energy efficiency with period accuracy. Products meet planning requirements while maintaining original wooden frames and traditional sightlines.
Questions
What makes Slenderpane's units suitable for heritage buildings?
Our units feature sightlines as narrow as 6mm, replicating single-glazing aesthetics while achieving modern thermal standards. This balance meets conservation officer requirements for listed properties.
Do you offer guarantees on your glass units?
Most units carry a 10-year warranty, with guarantees covering both thermal performance and manufacturing quality. Certificates of compliance are available on request.
Can you produce small-sized toughened glass?
Yes, our specialist plant produces toughened glass down to 100x100mm sizes, ideal for heritage sash windows where safety glazing is required in restricted spaces.
How do you ensure thermal efficiency?
We use warm-edge spacers, inert gases like krypton/argon, and low-emissivity coatings to achieve U-values between 0.9 and 1.9, meeting Part L building regulations.
What delivery timelines should trade customers expect?
Annealed units typically dispatch within 4-5 days, while toughened units take 8 days. We aim to return quotes within 24 hours for trade customers.
