Doors
Triple glazed bifold doors
Bifolds are the go-to for extensions because they open the room to the garden. In winter they are a big glass wall, so triple glass makes a real difference. Look for a system tested for the panel weight and with a good weather rating; the threshold detail matters as much as the glass.
Summary
Bifold doors are made of several panels hinged together that fold and slide to one or both sides, opening almost the full width of the opening. Triple glazed bifolds use three-pane units in every panel, so the frames and hinges must be strong enough for the extra weight; aluminium is the usual choice.
What you get
| Panels | 2 to 7 panels, folding left, right or both |
|---|---|
| Frames | Thermally broken aluminium (uPVC and timber available) |
| Glass | Triple safety glass units |
| Hardware | Top-hung or bottom-rolling, rated for panel weight |
| Thresholds | Weather or low threshold |
| Typical lead time | 5 to 8 weeks |
Guide prices
Guide prices for supply and fitting, including removal of the old door.
3-panel bifold
about 2.4 m wide, aluminium
£4,295 – £5,395inc VAT · £3,580 – £4,495 ex VAT
- Triple glazed panels
- Removal of the old door or window
- Fitted, sealed and finished
4-panel bifold
about 3.2 m wide, aluminium
£5,295 – £6,695inc VAT · £4,410 – £5,580 ex VAT
- Triple glazed panels
- Removal of the old door or window
- Fitted, sealed and finished
5-panel bifold
about 4 m wide, aluminium
£6,295 – £7,895inc VAT · £5,245 – £6,580 ex VAT
- Triple glazed panels
- Removal of the old door or window
- Fitted, sealed and finished
Guide prices, supply and fit. The written quote after your survey fixes the price for the specification shown; anything extra is agreed with you first.
Is it right for your home?
A good fit for
- Extensions and garden rooms
- Openings you want fully open in summer
- Modern homes with slim aluminium elsewhere
Think twice if
- Openings rarely opened, where a slider gives more glass and fewer frames
- Narrow openings under about 1.8 m
Options
- Traffic door for everyday use
- Low thresholds
- Integral blinds
- Dual colour frames
- Solar-control glass
Why aluminium for triple glazed bifolds
Each bifold panel hangs from or rolls on hardware at its edge, so heavy triple panels need stiff frames. Aluminium keeps sightlines slim while carrying the load. uPVC and timber bifolds exist, but panel sizes are more limited with triple glass.
Using bifolds every day
A traffic door, a single panel that opens like a normal door, lets you use the bifold daily without folding the whole set. It is worth including on most installations.
Building Regulations by nation
| Nation | Replacement doors | Sign-off |
|---|---|---|
| England | 1.4 W/m²K, or a door set energy rating of band C (more than 60% glazed) or band B (other doors) | Competent person scheme or building control |
| Wales | 1.4 W/m²K, or a door set energy rating of band C (more than 60% glazed) or band B (other doors) | Competent person scheme or building control |
| Scotland | 1.6 W/m²K | No building warrant for a straight replacement; must meet the standards |
| Northern Ireland | 1.8 W/m²K | No building notice for a straight replacement; must comply |
Full regulations guide, with sources →
Questions about bifold doors
How much are triple glazed bifold doors?
Our guide starts at £4,295 fitted for a 3-panel aluminium bifold about 2.4 m wide and £6,295 for 5 panels, inc VAT.
Are bifolds warmer with triple glazing?
Yes. The glass is most of the door area, so triple units cut heat loss and keep the inner surface warmer.
Are bifold doors secure?
Good systems lock at multiple points on each panel and use anti-snap cylinders. We specify tested doorsets where available.
Do I need building regulations for new bifolds?
Replacing an existing door is covered by the replacement rules. A new or widened opening is structural work that needs building control approval.
Related products
Sliding patio doors
From £1,895Big sliding panes in uPVC or aluminium, with heavy-duty rollers.
Learn more →
French doors
From £1,295Pairs of opening doors to the garden, in uPVC or aluminium.
Learn more →
Aluminium windows
From £1,095Slim, strong frames with thermal breaks, for big panes and modern homes.
Learn more →
New builds and self-builds
From £11,195Window and door packages delivered and fitted to your build programme.
Learn more →Bifold doors by area
England
- Bedfordshire
- Berkshire
- Bristol
- Buckinghamshire
- Cambridgeshire
- Cheshire
- Cornwall
- County Durham
- Cumbria
- Derbyshire
- Devon
- Dorset
- East Riding of Yorkshire
- East Sussex
- Essex
- Gloucestershire
- Greater London
- Greater Manchester
- Hampshire
- Herefordshire
- Hertfordshire
- Isle of Wight
- Kent
- Lancashire
- Leicestershire
- Lincolnshire
- Merseyside
- Norfolk
- North Yorkshire
- Northamptonshire
- Northumberland
- Nottinghamshire
- Oxfordshire
- Rutland
- Shropshire
- Somerset
- South Yorkshire
- Staffordshire
- Suffolk
- Surrey
- Tyne and Wear
- Warwickshire
- West Midlands
- West Sussex
- West Yorkshire
- Wiltshire
- Worcestershire
Scotland
Bifold doors: get your guide price
Use the guide-price tool, or book a free survey for a written quote that fixes the price.