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Exclusive Flush Stacking Design
Unique to Glideline sliding doors, the flush stacking facility means doors stack neatly together when open. Unlike traditional sliding systems where panels protrude awkwardly, the GS20’s innovative design creates a clean, unobtrusive appearance that gives you more of your available opening.
This exclusive feature not only looks better but operates more smoothly, ensuring your sliding doors remain a design feature even when fully open.
Exceptional Thermal Performance
Achieve U-values from 1.3 W/m²K thanks to thermally broken aluminium construction and high-performance glazing up to 30mm thick. Advanced polyamide thermal breaks eliminate cold bridging, whilst triple glazing options deliver superior insulation and acoustic performance.
The GS20 doesn’t just look beautiful, it dramatically reduces your heating costs whilst keeping your home comfortable year-round.
Industry-Leading 20mm Sightlines
The GS20 features the slimmest central sightline available in the UK market at just 20mm. This ultra-slim profile maximises your glazed area by up to 15% compared to standard aluminium sliding doors (50-60mm) and dramatically outperforms traditional uPVC systems (100mm+).
More glass means more natural light flooding your home, uninterrupted views of your garden or landscape, and a truly contemporary aesthetic that defines modern architectural design.
Bespoke Configuration Options
Every GS20 installation is custom-manufactured to your exact specifications. Choose from two to six sliding panels with fixed or open corner designs, panel widths from 800mm to 2500mm, and heights up to 3 metres for stunning floor-to-ceiling glazing.
Select from over 150 RAL powder coat colours or anodised aluminium finishes, with dual-colour options allowing different internal and external finishes to perfectly complement your home’s aesthetic.
PAS24 Security & Performance
The GS20 has passed rigorous PAS24 security testing the UK standard for enhanced security performance. Multi-point locking mechanisms with upgraded hardware, anti-lift blocks, and reinforced aluminium frames ensure both security and peace of mind.
Tested to achieve Class 4 air permeability (600Pa), Class 7A water tightness (300Pa), and Class C5 wind resistance (2000Pa), the GS20 delivers exceptional performance in all British weather conditions.
Professional Installation by Lightfoot Windows
As certified Glideline installers, our expert team ensures every GS20 system is fitted to the highest standards. From initial survey and design consultation through to final commissioning and aftercare, we manage your entire project with meticulous attention to detail.
Our comprehensive installation service includes structural assessment, building regulation compliance, and a full handover ensuring your doors operate perfectly for years to come.
Made in Britain
Crafted in Glideline’s advanced UK factory with quality checks at every stage of manufacturing, GS20 sliding doors are made from premium-grade aluminium with professionally applied powder coating, anodising, or special finishes.
Every door is meticulously manufactured to the highest British standards with a luxurious look, feel, and quality that’s instantly visible. Our 10-year manufacturer warranty provides complete peace of mind for your investment.
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What are the key features and benefits of GS20 sliding doors?
Considering GS20 sliding doors for your home or commercial project? Our comprehensive FAQ answers the most common questions about specifications, performance, security, and installation to help you make an informed decision about this premium British-made sliding door system.
What makes the GS20 sliding door different from standard sliding doors?
The GS20 features an ultra-slim 20mm central sightline, which is among the narrowest available in the UK market. This significantly reduces visible frame mullions compared to traditional sliding doors, maximising your glazed area by up to 15%. Additionally, the GS20 offers exclusive flush stacking technology, meaning panels stack neatly together when open rather than protruding, giving you more usable space. The system is British-made with precision engineering, achieving U-values from 1.3 W/m²K and PAS24 security certification as standard.
How tall can GS20 sliding doors be manufactured?
GS20 sliding doors can be manufactured up to 3 metres (3000mm) in height, making them ideal for floor-to-ceiling glazing in contemporary extensions and new builds. Panel widths range from 800mm to 2500mm, with a maximum panel weight capacity of 320kg. This allows for impressive expanses of glass whilst maintaining structural integrity and smooth operation. The system can accommodate two to six panels in various configurations, including fixed panels, open corners, and pocket door designs.
What security features do GS20 sliding doors have?
GS20 sliding doors have passed rigorous PAS24 security testing, which is the UK standard for enhanced security performance of doors. The system includes multi-point locking mechanisms with upgraded hardware as standard, anti-lift blocks to prevent forced entry, and reinforced aluminium frames. The doors achieve Class 4 air permeability (600Pa), Class 7A water tightness (300Pa), and Class C5 wind resistance (2000Pa), ensuring both security and weatherproofing. All components are BSI Kitemark quality assured for additional peace of mind.
Can I choose different colours for the inside and outside of my GS20 doors?
Yes, GS20 sliding doors offer dual-colour options, allowing you to select different finishes for the internal and external faces. You can choose from over 150 RAL powder coat colours, including popular options like Grey 7016, Black 9005, and White 9016. Alternatively, anodised aluminium finishes are available in various options including brushed silver, champagne, bronze, and black. Textured finishes are also available for a contemporary matt appearance. This flexibility ensures your doors complement both your interior décor and external architectural style.
How energy efficient are GS20 sliding doors?
GS20 sliding doors achieve excellent thermal performance with U-values from 1.3 W/m²K, significantly better than older sliding door systems. The aluminium frames feature thermal breaks to prevent cold bridging, and the system accepts glazing units up to 30mm thick, allowing for high-performance double or triple glazing. For enhanced acoustic insulation, specialist glass options can filter up to 41dB of external noise. The combination of slim profiles, thermally broken frames, and quality glazing means your GS20 doors will reduce heating costs whilst maintaining comfort throughout the year.
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What our customers say
Despite being a small project by comparison, from start to finish our project has been executed with precision, promptness and professionalism to deliver a thing if beauty which as we...
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LOVE. LOVE. LOVE my windows and doors! They look amazing! ? Lightfoot Windows were a pleasure to deal with. Polite, helpful and informative. Plan to use them again for a...
Read more
Adiba Ghauri
Very efficient and thorough. Quick installation. Very helpful and friendly staff. My new Crittall windows are beautiful.
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Susan Tuffy
I would like to thank the team at Lightfoot windows for supplying and fitting my new Crittal windows, from start to finish the service has been great and the product...
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Lee
Excellent windows (Heritage Aluminium french doors). Our builder was impressed with the excellent quality and will be using again. Efficient fitting, fitted perfectly.
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Sophia Barlow
I am very pleased with the Crittall windows as supplied and fitted by Lightfoot. I visited their showroom and discussed the requirements, and these were met in full. From the...
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David SC
Probably one the best experiences we've had with a building contractor/supplier. We went to the showroom where we were given all the information we needed and shown the various options...
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Paul Phillips
Lightfoot supplied & installed a steel Crittal arch for an internal opening. Both the design and install process was very professional and we are delighted with the product. Would highly...
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Richard Simpson
We have used Lightfoot Windows on two occasions now, and both times their service has been exemplary. The products we purchased are also of a very high quality and we...
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Martin French
I cannot recommend Lightfoot highly enough. I used to run a business, and the sheer pleasure and relief of being communicated with properly and courteously means a lot. It’s rare...
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Catherine C
So happy to have found Lightfoot Windows who supplied fire rated Crittall doors and screens. Great showroom full of inspiration. Unhurried great advice given, quote and contract really streamlined and...
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Torsten Mansson
Despite being a small project by comparison, from start to finish our project has been executed with precision, promptness and professionalism to deliver a thing if beauty which as we had hoped brings the outside in - our garden by day and the stars by night. We had the pleasure of Reese (still amazed at the price of a cup of tea and a bed for the night in Driffield) and Brad installing our curtain wall, accounting for the vagaries of an old property on a freezing cold day. Marcin as surveyor/project managing was careful and considered in his surveying and measuring. Clear and concise in his instructions to our builder. Paul's input at the design and acquisition stage ensured there was accurate representation of what we wanted. Praise indeed from an aircraft design engineer used to working to a "thou of an inch". We wouldn't hesitate to recommend investing in this company and its products.
Sharman & Phil
LOVE. LOVE. LOVE my windows and doors! They look amazing! ? Lightfoot Windows were a pleasure to deal with. Polite, helpful and informative. Plan to use them again for a new internal window very soon. Would definitely recommend. Thank you guys !
Adiba Ghauri
Very efficient and thorough. Quick installation. Very helpful and friendly staff. My new Crittall windows are beautiful.
Susan Tuffy
I would like to thank the team at Lightfoot windows for supplying and fitting my new Crittal windows, from start to finish the service has been great and the product is first class. great value for money.
Lee
Excellent windows (Heritage Aluminium french doors). Our builder was impressed with the excellent quality and will be using again. Efficient fitting, fitted perfectly.
Sophia Barlow
I am very pleased with the Crittall windows as supplied and fitted by Lightfoot. I visited their showroom and discussed the requirements, and these were met in full. From the initial visit to the final fitting Lightfoot exceeded my expectations and I would unhesitatingly recommend them.
David SC
Probably one the best experiences we've had with a building contractor/supplier. We went to the showroom where we were given all the information we needed and shown the various options for our kitchen patio doors. We selected what we wanted and gave the dimensions and by the time we got home, there was a plan and an estimate in our inbox.
Paul Phillips
Lightfoot supplied & installed a steel Crittal arch for an internal opening. Both the design and install process was very professional and we are delighted with the product. Would highly recommend and I would certainly use them again for future products.
Richard Simpson
We have used Lightfoot Windows on two occasions now, and both times their service has been exemplary. The products we purchased are also of a very high quality and we are really happy with them. The surveyors and installers were careful, considerate and polite. We highly recommend Lightfoot Windows and will definitely use them again should the need arise.
Martin French
I cannot recommend Lightfoot highly enough. I used to run a business, and the sheer pleasure and relief of being communicated with properly and courteously means a lot. It’s rare these days. The windows and installation were excellent. Reece, Grant & Bradley were fantastic. Particularly as they were up against supply issues, parking restrictions not to mention Covid.
Catherine C
So happy to have found Lightfoot Windows who supplied fire rated Crittall doors and screens. Great showroom full of inspiration. Unhurried great advice given, quote and contract really streamlined and easy to understand. Service was excellent throughout visiting, ordering measuring up and installation. Special thanks to Daniel at the showroom, Reece Taylor for an excellent installation and finish. Really pleased with the product and service. Would not hesitate to recommend and will definitely use again in the future.
Torsten Mansson