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Sliding glazed doors have become a prominent feature of many homeowners’ project plans, offering useful access along with uninterrupted views that work to blur the boundaries between living spaces and the outside. “Sliding doors used to be used as a small gateway to the garden, but they are now considered one of the main features of a house and a leading conversation starter when clients are considering doors for their project,” says Craig Luff, managing director at EcoHaus Windows & Doors.
Forget the patio doors of the past – modern designs see wide spans of glazing, ultra-thin framing and level thresholds. “As Building Regulations have tightened up the requirements for thermal performance, sliding doors are now generally more efficient than ever before, with some systems capable of achieving Passivhaus standards,” says Edward Stobart, technical sales manager at IDSystems.
In this sliding patio doors guide, I’m looking at the top 10 factors to consider when specifying a set-up that works for your project and lifestyle.
Sliding doors can be incredibly heavy – with a triple-glazed door weighing over 200kg – so the mechanism that allows the panels to glide effortlessly on the tracks is very important. “One of the things that can go wrong is the running gear,” says Edward. “Avoid systems that use nylon wheels in their running carriages because these are more likely to buckle or deform under the weight of the panel. Instead, look for products with stainless steel running carriages, which not only last longer, they also allow the panels to slide much easier.”
Norrsken’s lift and slide triple glazed alu-clad sliders have been integrated with a level threshold in this home
Most systems have the glazed doors sitting into a recessed floor track, with a combination of moving and/or fixed panels. The number of tracks will depend on the number of sliding elements. The alternative is a lift and slide design. “These use a handle-operated system that lifts the panel onto its rollers, allowing even very heavy doors to glide with minimal effort,” says Alex Alsop, founder and sales director at Norrsken. “Inline sliders are simpler – the panel travels along a track without lifting – but are generally limited to smaller openings.”
There are options when it comes to the frames surrounding the glass, in terms of makeup, colour and thickness. Here are the most popular frame materials for glazed sliding doors:
In recent years, there has been a trend to get frames as thin as possible to give that real sense of an unobstructed connection between inside and out. “Realistically 20mm is as slim as can practicably be achieved, and that has become pretty standard,” says Edward. “However, in order to achieve ultra-slim frames, a number of manufacturers have chosen to permanently bond the glass to the door frame. This is fine unless you ever have an issue with the glass, as then the entire panel of the door needs replacing.”
These sliding doors from EcoHaus glide back from the middle of the opening, stacking against fixed panels on either side
Ultra-thin frames look spectacular in wide spans of sliders, where the joins between panels are barely there. But consider them for smaller spaces, too. “They will work to maximise the light and view,” says Dan Todd, sales director at Kloeber. “The key is ensuring that you have a slim sightline around the perimeter of the frame, not just for that central sightline.”
If you’ve filled a big aperture with a sliding door system, ultra-wide panels will look fantastic. Individual panels can be over 4m wide – but bear in mind that the operating mechanism will need to work reliably with the hefty weight of the large units. Remember also that your installers need suitable site access and cost-adding lifting equipment to get those big panes into place.
If you are thinking of creating large spans of glazing, robust structural engineering is crucial. “A sliding door cannot have any weight bearing down on it otherwise it will interfere with how it slides, so the support above needs to be carefully designed,” says Craig.
And don’t forget that large expanses of glass come with considerable solar gain. You will need to factor in appropriate shading to ensure your beautiful views out don’t create unbearably hot rooms in the summer months. Overhanging roofs and brise soleils are options to discuss with your architect or designer at the planning stages.
Case study Rural timber-clad self build with glazed sliding doors
Freddie Pack built his first home, a compact cabin for him and his now-wife Katie, on his family’s farm on the stunning Romney Marsh in Kent. However, after a few years of saving, the couple decided they needed more space. There was another plot on the family farm – just a few fields away – that felt like the ideal spot. There was an existing property on the site already – a 1950s brick house. The couple considered renovating it, but quickly realised it would be more cost-effective to knock down and self build from scratch.
Photo: Richard Gadsby
To recreate the farm-style design with a modern twist, the couple enlisted the help of Rob Pollard of RX Architects, who says: “the brief was to create an adaptable and practical country home. The design needed to suit their lifestyle now, but also with the potential to adapt as they grow as a family.”
A boot room, utility space, and office were all essential for them, as were bright, open and fun living spaces. The design also incorporated high levels of insulation, triple glazing and an air source heat pump, resulting in a low-energy property with minimal long-term running costs. The design and planning process took 18 months, and permission was granted to create a detached dwelling alongside a garage.
Photo: Richard Gadsby
The home is clad in Siberian larch, with charred sections on the lower level. Inside, the larch staircase is a focal point in the downstairs living space, while the open-plan area features a dark teal kitchen, plus a dining and sitting area with a large void above, finished in raw plaster with a beautiful pink hue. The scheme features glazed sliding patio doors from Norrsken, which perfectly capture views of the surrounding countryside.
| Owners | Freddie & Katie Pack |
| Project | Self build |
| Location | Kent |
| Size | 175m² |
| Project cost | £350,000 |
A nice detail to help with a smooth connection to your patio is getting rid of any drop down when you step out. Level thresholds are made by recessing the door track and frame into the floor structure, so the inside and outside levels align. “Doing this typically involves knowing the depth of the track and making early decisions about the type (and depth) of the finished flooring, both inside and out. You’ll need to coordinate the structural slab, insulation and screed depths to ensure the track is positioned at the exact height to make it flush when everything is installed,” says Edward.
Always go through these details with your designer to make sure it all ends up as you expect it to be – and has suitable weather resistance. “A beautiful door is only as good as its ability to keep out the British climate,” says Alex. “Look for certification to at least BS 6375. Norrsken sliding doors are tested to EN 12208, Class E750, meeting more rigorous requirements for high-level or coastal locations.”
The whole idea of going for triple glazing over double glazing is that it has a more thermally efficient barrier, which will stop warmth from leaking out of the building. Obviously, a sheet of glass is never going to be as insulated as a solid wall. There are projects, such as Passivhaus-certified homes, that require triple glazing, and some sliding door suppliers highly recommend it for reducing heat loss – but there’s some debate about whether it’s always worth doing.
A timber internal finish brings warmth and character to interiors. These sliders are from Internorm
“The development of double glazing technology means that the difference between double and triple glazing is relatively small,” says Edward. “The added weight, cost and size restrictions mean that formost extensions and renovation projects double glazing is perfectly adequate.” A product’s U-values are the thing to pay attention to when it comes to energy efficiency (a measure where lower numbers mean better performance) but you should always look for whole-door U-values rather than just that of the glass.
how to specify glazing for an eco home
Having two sliders glide back from the edge of the building to expose a fully-open corner is a stunning architectural feature that adds real wow factor. “The most important detail is how the roof or walls above will be supported. Is it a cantilever steel or are there steel posts located in the vicinity? Either way, no weight can bear down on the sliding door, so what is above needs fully supporting,” says Craig. In terms of the doors themselves, they’re almost exactly the same as a standard configuration, but will just need a different style of locking profile added to one side of the lead door.
Your sliding door budget will depend on size, material and features. “A simple two-panel arrangement with one fixed and one sliding leaf is the most economical,” says Alex. “Costs increase with additional panels, particularly triple-track lift and slide systems where two panels stack at one end to maximise the openable area. Glass-to-glass corner configurations can add cost depending on the specification.” Expect sliding doors with narrow frame systems to cost 10-20% more than thicker units.
These are indicative costs for various sizes of sliding door systems. You should always seek project-specific quotes, and prices will depend on factors such as thermal performance, glazing spec, locking mechanisms, threshold type etc.
| System | Supplier | Size (w x h) | Configuration | Supply price (double-glazed) | Supply price (triple-glazed) |
|---|---|---|---|---|---|
| Visiline (aluminium bonded) | Ecohaus (2025 cost) | 3,500mm x 2,200mm | 2 panel double track | £3,300 + VAT | £5,800 + VAT |
| Lift and slide (aluminium) | Kloeber | 4,000mm x 2,200mm | 2 panel (1 sliding, 1 fixed) | £5,385 + VAT | £6,315 + VAT |
| theEDGE2.0 (aluminium part-bonded) | IDSystems | 4,000mm x 2,200mm | 3 or 4 panels | £8,350 + VAT * | n/a |
| theEDGE2.0 (aluminium part-bonded) | IDSystems | 4,000mm x 2,200mm | 2 panel | £8,915 + VAT * | n/a |
| SF80 (aluminium – dry glazed) | Sunflex | 4,000mm x 2,200mm | 3 panel | n/a | £13,650 + VAT * |
| SF80 (aluminium – dry glazed) | Sunflex | 4,000mm x 2,200mm | 2 panel | n/a | £14,050 + VAT * |
| Visiline (aluminium bonded) | Ecohaus (2025 cost) | 5,500mm x 2,200mm | 3 panel triple track | £5,900 + VAT | £10,200 + VAT |
| theEDGE2.0 (aluminium part-bonded) | IDSystems | 6,000mm x 2,200mm | 3 or 4 panel | £11,365 + VAT * | n/a |
| theEDGE2.0 (aluminium part-bonded) | IDSystems | 6,000mm x 2,200mm | 2 panel | £12,660 + VAT * | n/a |
| SF80 (aluminium – dry glazed) | Sunflex | 6,000mm x 2,200mm | 3 panel | n/a | £18,250 + VAT * |
| SF80 (aluminium – dry glazed) | Sunflex | 6,000mm x 2,200mm | 2 panel | n/a | £20,445 + VAT * |
| Lift and Slide (aluminium) | Kloeber | 8,000mm x 2,200mm | 4 panel (2 sliding, 2 fixed) | £11,840 + VAT | £13,795 + VAT |
*includes fitting
Good installation is key to getting the performance you’re expecting from your doors. Most glazed door suppliers provide a fitting service or will recommend trusted trades to do the job. “Capable contractors can absolutely install bespoke sliding doors: just ensure they demonstrate genuine expertise with high-performance fenestration,” says Alex. Make sure your installer has proper lifting equipment and experience with heavy, delicate items.
IDSystems’ range of ultra-slim sliding doors, the EDGE2.0, won Best Glazed Doors at the 2021 Build It Awards, where the judges praised the design and quality of the system
“Equally important is getting the details right,” adds Alex. “The threshold needs structural support without thermal bridging. The door frame must be accurately positioned with properly specified fixing and sealing. When installers don’t know the product, these conversations happen on site rather than during planning, leading to compromises, delays and additional costs.”
Sliding doors are a considerable expense, so you want to make sure your investment is protected should anything go wrong. Warranty terms vary between suppliers, so always check the details. Ask if it covers the full door or just certain components, and whether installation is included. “Whilst there will be exclusions in any warranty, it’s really important that you ask for these details prior to placing an order. How a warranty is written can give you a great insight into the level of aftercare you can expect,” says Dan.
Ed Stobart is technical sales manager at IDSystems. He has 20 years’ experience working closely with thousands of customers, builders and architects to offer advice and support on glazing solutions.
Overheating can be a common concern with large expanses of glazing, particularly on south-facing elevations, but its impact can be significantly reduced thanks to modern glazing specification.
On south facing elevations it is important to opt for high-performance solar control glass, which reduces solar gain while still allowing plenty of natural light. Solar control glass coatings are specialist treatments applied to the surface of the glass that reduce the amount of solar heat entering a building while maintaining high levels of natural light.
Typically consisting of a microscopically thin metallic layer, these coatings reflect and filter infrared radiation from the sun, helping to prevent overheating and improve indoor comfort. They can be applied during the manufacturing process, often as part of double or triple glazing units. By limiting solar gain without significantly tinting the glass, solar control coatings support energy efficiency, reducing reliance on cooling systems and contributing to a more stable internal environment throughout the year. Positioning of the doors is also key on south-facing elevations. Home designs that incorporate shading solutions such as overhangs, brise soleil, or external blinds will prevent overheating.
Aluminium is widely regarded as the lowest-maintenance option for sliding and bifold doors. It is inherently resistant to warping, rust, and corrosion, and modern powder-coated finishes require minimal upkeep beyond occasional cleaning.
Unlike timber, aluminium doesn’t need repainting, oiling or varnishing, and compared to uPVC, it offers superior longevity and structural strength allowing for slimmer frames. For homeowners seeking durability with minimal ongoing effort, aluminium is typically the best choice.
For aluminium door systems, preventing cold bridging through the frame starts with performance of the polyamide thermal break between the inner and outer aluminium profile. Enhanced Building Regulations covering energy efficiency mean that all modern door systems are thermally efficient but how efficient is governed by these insulating barriers that reduce heat transfer.
Beyond the frame high-quality double or triple glazing with warm-edge spacer bars also plays a crucial role. Proper installation is equally important, ensuring airtight seals and correct insulation around the frame prevents cold spots where condensation can form. Good ventilation within the home further reduces moisture build-up and condensation risk.
Security should be designed in from the outset. Look for systems that meet recognised standards such as PAS 24 and incorporate multi-point locking mechanisms, robust frames, and anti-lift features. Laminated security glass adds an additional layer of protection; indeed it is a requisite of Part Q of Building Regulations for new-build homes, whilst high-quality hardware and professional installation are just as important as the door itself – ensuring everything functions as intended and resists forced entry. Choosing a reputable manufacturer and installer is key to long-term security.
Effective drainage is essential for sliding door systems. High-quality systems are designed with integrated drainage channels that direct water away from the track and out through weep holes. It’s important these are kept clear of debris through occasional cleaning. Threshold design also plays a role, rebated or weathered thresholds (particularly on bifold doors) can help manage water ingress in exposed locations. Correct installation, including ensuring the sill is level and properly sealed, is critical to prevent standing water issues.
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