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The glazing you choose for your bifold doors affects how warm your home stays in winter, how comfortable it is in summer, how secure your doors are, and how much maintenance they need over time. It is one of the most important decisions in the specification process, and it is one that often gets less attention than frame colour or panel configuration.
This blog covers the main glazing options available for bifold doors, what each one does, and how to choose the right specification for your project.
The first decision most people face is whether to go with double or triple glazing. Both are available across our bifold door range from Origin and Smarts, and both meet current UK building regulations when specified correctly.
A standard double glazed unit consists of two panes of glass with an argon-filled cavity between them. For most residential bifold door installations in the UK, high performance double glazing is more than adequate. It is lighter than triple glazing, which matters when you are dealing with large bifold panels, and it still delivers strong thermal performance when the right glass specification is chosen.
We supply double glazed units with low-emissivity coatings as standard. This coating, commonly referred to as low-E glass, reflects heat back into the room rather than allowing it to escape through the glass. The result is a warmer room in winter without a significant increase in heating costs.
Triple glazing adds a third pane of glass and a second cavity, reducing heat loss further. It is a genuine upgrade in terms of thermal performance, but it is not always the right choice for bifold doors specifically.
In our experience, triple glazing works better than double glazing for fixed windows and roof lanterns because the weight penalty is easier to manage in those applications. With bifold doors, the additional weight of triple glazed units affects how the panels fold and stack, and it puts more stress on the hinges and tracks over time. For most residential projects, a well-specified double glazed unit performs excellently and avoids these mechanical considerations.
That said, for north-facing extensions or properties in exposed locations, triple glazing is worth the investment and both Origin bifold doors and Smarts systems can accommodate it.
Solar control glass is designed to reduce the amount of heat that passes through the glass from sunlight. It does this through a thin metallic coating that reflects solar radiation while still allowing visible light through.
For south or west-facing bifold doors, this is one of the most practical upgrades available. Without solar control glass, a large expanse of glazing facing the afternoon sun can make a room uncomfortably hot in the warmer months, even with the doors open.
From working with clients across Gloucestershire and beyond, we find solar control glass is most commonly requested for rear extensions that run along the south-facing wall of a property. Customers who specify it consistently report that their rooms are more comfortable in summer without needing blinds or additional shading.
It is worth noting that solar control coatings do reduce the amount of light that passes through the glass slightly, typically by around 10 to 15 percent. For most installations this is barely noticeable, but it is worth being aware of if the room already has limited natural light. In those cases, we would discuss the balance with you before recommending it.
Self-cleaning glass has a photocatalytic coating on the outer surface. When exposed to daylight, the coating breaks down organic dirt, and when rain falls, it sheets off the surface rather than forming droplets, carrying the loosened dirt with it.
For bifold doors in Cheltenham and other areas of Gloucestershire where the weather tends to be unpredictable, self-cleaning glass is a practical choice. It does not eliminate the need for cleaning entirely, but it significantly reduces how often the glass needs attention, particularly on the external face of the door.
It is especially useful on larger installations where external glass cleaning is more physically demanding, and on doors that open onto a garden where the glass is regularly exposed to pollen, dust, and general outdoor debris.
All of our bifold doors are supplied with toughened safety glass as standard. Toughened glass is processed to be several times stronger than standard float glass, and when it does break, it shatters into small, relatively harmless fragments rather than dangerous shards.
For additional bifold door security, laminated glass is available as an upgrade. Laminated glass consists of two panes bonded together with a tough interlayer. If the glass is broken, the interlayer holds the pane together, making it significantly harder to breach than toughened glass alone.
We fit laminated glass most commonly on ground floor installations where security is a higher priority, on properties in more exposed or urban settings, and for customers who simply want the highest available level of glass protection regardless of location.
Standard bifold door glazing provides a reasonable level of sound reduction, but acoustic glass takes this further. It uses a specialist interlayer within a laminated unit that is specifically designed to dampen sound frequencies.
For properties near busy roads, flight paths, or in densely built areas across Bristol, Bath, Oxford, or Birmingham, acoustic glass makes a noticeable difference to how quiet the room feels when the doors are closed. We have completed installations in both urban and semi-rural locations and the difference in ambient noise levels with acoustic glass fitted is something customers notice immediately.
Integral blinds sit permanently within the sealed double glazing cavity rather than hanging on a track on the wall or ceiling. Because they are enclosed within the unit, they require no cleaning, cannot be damaged by children or pets, and do not collect dust.
They are operated by a magnetic slider on the edge of the frame, which moves the blind up and down without breaking the seal of the unit.
We find integral blinds particularly popular on south-facing patio doors in Cheltenham and bifold doors where customers want to manage light levels without adding curtains or external blinds to the room. They give a very clean finish and suit modern interiors well.
The U-value of a glazing unit measures how much heat passes through it. The lower the number, the better the thermal performance.
Current UK building regulations require replacement glazing in existing dwellings to achieve a U-value of 1.4 W/m2k or better for the whole window unit. All of the glazing we supply across our bifold door range meets this as a minimum.
High performance double glazed units with low-E coatings and argon fill typically achieve whole-unit U-values of around 1.2 to 1.4 W/m2k. Triple glazed units can achieve 0.8 W/m2k or below depending on the specification.
When comparing glazing options, always ask for the whole-unit U-value rather than just the centre-pane figure. The centre-pane figure measures the glass alone and does not account for heat loss through the frame and edge of the unit, which is where a significant proportion of heat loss actually occurs.
The right glazing specification depends on the orientation of your opening, how you use the room, your priorities around security, maintenance, and thermal comfort, and your budget.
What we consistently find is that customers who invest in the right glazing specification upfront spend less time and money managing the consequences later. A south-facing room with standard double glazing and no solar control can become difficult to use in summer. A ground floor installation without laminated glass in a higher-risk area is a missed opportunity to improve security at relatively low additional cost.
We are happy to talk through the options based on your specific project. Every bifold door we supply and install is specified individually, and glazing choices are discussed as part of that process rather than selected from a fixed menu.
If you are based in Stroud, Cirencester, Tewkesbury, Worcester, Hereford, Evesham, or anywhere else across the region, you can visit our showroom in Cheltenham to see working examples of our bifold door range, or use our quote tool to get a bespoke price based on your opening and chosen specification.
We also cover London, Oxfordshire, Swindon, and Stonehouse for customers who want supply and installation further afield.
GET A FREE QUOTE HERE USING OUR TOOL / ALTERNATIVELY YOU CAN CALL US ON 0808 271 2398
