Fenster Glazing
Aluminium Bifold Doors
Aluminium bifold doors open up kitchens, extensions and living spaces with slim frames, flexible pane layouts and strong weather protection. We specify the configuration, traffic door, threshold, colour and glazing around how the room will be used.
Key specifications
Aluminium Bifold Doors
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U-value
1.0 W/m²K*
* Lowest achievable.
- Colour choice Any RAL colour
- Configuration Up to 7 panes
- Sightlines Ultra slim
Product information
Aluminium Bifold Doors
Aluminium bifold doors open up kitchens, extensions and living spaces with slim frames, flexible pane layouts and strong weather protection. We specify the configuration, traffic door, threshold, colour and glazing around how the room will be used.
Open-plan living
Aluminium bifold doors create a wide, flexible opening between your home and garden while keeping strong weather protection when closed.
Slim aluminium sightlines
Narrow frames help maximise glass area, daylight and views without compromising everyday durability.
Configured around the opening
We help plan pane count, traffic doors, thresholds, colours, glazing and hardware around the way the space will be used.
Thermally broken frames
High-performance aluminium frames and modern glazing help retain warmth, reduce draughts and keep the room comfortable when the doors are closed.
Installed with care
The opening, levels, drainage and threshold details are checked before manufacture so the doors fold, seal and lock correctly after installation.
Open-plan living
Aluminium bifold doors create a wide, flexible opening between your home and garden while keeping strong weather protection when closed.
Slim aluminium sightlines
Narrow frames help maximise glass area, daylight and views without compromising everyday durability.
Configured around the opening
We help plan pane count, traffic doors, thresholds, colours, glazing and hardware around the way the space will be used.
Thermally broken frames
High-performance aluminium frames and modern glazing help retain warmth, reduce draughts and keep the room comfortable when the doors are closed.
Installed with care
The opening, levels, drainage and threshold details are checked before manufacture so the doors fold, seal and lock correctly after installation.
Product guide
More information on Aluminium Bifold Doors
Choose the pane count, traffic door, threshold, sash weight and security specification around how the doors need to fold and open day to day.
Sheerline Prestige
1.0 W/m²K option
Configurations
Up to seven panes, with traffic door options depending on layout
Pane count and traffic door position decide how the doors work every day, not just how they look fully open.
Panel capacity
Large sash sizes and heavy-duty hardware are specified around the opening
Larger panes need the right hardware, glass weight and frame design so operation stays smooth over time.
Thresholds
Weathered, low and access threshold conversations at survey
The threshold choice balances weather protection, access and internal floor levels.
Security
Multi-point locking, shootbolts/deadbolts and security interlocks where specified
The locking plan covers the main traffic door, intermediate panels and the meeting points between sashes.
Configurations
How many panes, and which way they fold.
A bi-fold runs from two panes up to seven. They can all fold to one side, or split and open from the middle, and most layouts can carry a traffic door.
A traffic door is one leaf that opens on its own, so you can step out without folding the whole run back.
01 / 17
Configurations and maximum widths are Sheerline's published figures for the Prestige bi-fold, and every layout is shown folded open. Which one suits your opening is settled at survey.
Design and price it
Specification choices
Finish the design with your colours, glass and hardware.
Choose your colours, privacy glass and hardware; each guide helps narrow the detail before survey.
Colour
Twelve standard colours, powder coated in the UK.
Powder coating is baked onto the aluminium rather than painted over it, so it does not flake and it never needs redoing. Anthracite Grey and Jet Black are the two we fit most often, and both sit well against brick and render alike.
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Pure White
RAL 9010 Matt
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Hipca Gloss White
RAL 9910 Gloss
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Anthracite Grey
RAL 7016 Matt
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Jet Black
RAL 9005 Matt
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Cream
RAL 9001 Matt
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Agate Grey
RAL 7038 Matt
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Squirrel Grey
RAL 7000 Matt
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Pastel Turquoise
RAL 6034 Matt
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Chocolate Brown
RAL 8017 Matt
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Silver Metallic
Metallic effect
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Mid Bronze Metallic
Metallic effect
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Black Metallic
Metallic effect
You can have a different colour inside and out, and beyond these we can match any RAL colour, confirmed against a sample before your door is ordered. If you have a shade in mind, ask and we will tell you what is possible. Compare colours across every material
Product questions
FAQs about Aluminium Bifold Doors
How many panes can aluminium bifold doors have?
We can specify bifold configurations up to seven panes, depending on the opening size, layout and access requirements.
Can bifold doors include a traffic door?
Yes. A traffic door can be included in many configurations so you can use one everyday entrance without opening the full set.
Are bifold doors thermally efficient?
Yes. The aluminium bifold systems are specified with thermally broken frames and high-performance glazing to support comfort through the year.
Can I choose the colour and hardware?
Yes. We can help you choose RAL frame colours, handle finishes, threshold details and glazing options for the property.
Will the doors be surveyed before manufacture?
Yes. The opening, threshold, access and installation details are checked before manufacture so the finished doors fit correctly.
Order process
A clear process from first quote to aftercare.
Four steps. The first one has two ways in: price it yourself online, or have us come out. After that it runs the same either way.
Your price
Price it yourself on the online tool, or book a free consultation and we build the same quote with you. Both run on the same price list, so the figure matches.
Technical survey
Once you go ahead we survey before anything is made. Not a second sales visit: the measurements, thresholds and fixings the factory needs to build it right.
Installation
Fitted by our own installers rather than subcontractors, trained on the systems we sell and working carefully in a house someone lives in. We clear up after ourselves before we leave.
Aftercare
A ten year insurance-backed guarantee through the CPA on new windows and doors, and your FENSA certificate sent direct. Anything afterwards, you ring us, not a call centre.
What Milton Keynes homeowners say
Real reviews from real installations. Every one is public, so you can go and check them yourself.
Stuart Matthew
7 months ago
Fenster have just completed a front door installation on my new property - fantastic job and strongly recommend! The online design tool is great, Perry back at HQ is brilliant as is his communication. Andy, who installed the door, is a top gent and professional. Will definitely be a returning customer.
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Joanna Hayes
2 months ago
Really happy with the service we received from Fensters Windows. Aaron and Shane turned up on time and were both really friendly. They explained any issues as they went along and talked us through the different options, which we really appreciated. They did a great job fitting our new back doors and cleaned up everything afterwards. We also paid exactly what we had originally been quoted, with no unexpected extra costs. Really pleased with our new doors and would definitely recommend Fensters Windows. Thank you Aaron and Shane!
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Digger
2 months ago
We have used Fensters for years on a variety of glazing work, and 2 door installations. They are competitively priced and responsive. They take great care over measuring and specifying the work, giving you a clear quote so you understand what you are getting (thanks Perry!). The fitters are all extremely competent and personable. We had to replace our front door for accessibility reasons, they gave us confidence that our requirements would be met, reproduced the intricate leaded and stained-glass pattern of our old door, and did a quality fitting job (thanks to Johnnie and Shane!). In summary they are our go-to suppliers for all replacement and repair work.
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Silvia Peraro
a month ago
I had an excellent experience with Fenster Glazing from start to finish. Nick Perry and David managed the initial quote to installation process seamlessly, keeping communication clear, honest, and completely stress-free. When it came to the actual fitting, Zac and Shane did a fantastic job with the installation, working efficiently and leaving everything spotless. The professionalism from the entire team was top-notch, and the final result looks brilliant. I highly recommend them.
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Bernie Raffe
3 months ago
Great service from Fenster Glazing, very happy with our new bi-fold door, glass door and windows (with built-in blinds) There was an issue with the wrong spec of glass provided to them from their supplier, so they had to temporarily board up a door and a window, but this was put right within a few weeks. Recommended, thanks.
Read on Google Zak Jessup 12 Jun 2025Cannot recommend higher! Nick and Perry were really helpful in getting my windows sorted ASAP.
Read on Google Norman Cummings 10 Jun 2025The best service ever, great workmen, very high standard and in the finish, excellent eye to detail.
Read on GoogleFrom our case studies
Real installs, photographed on the day.
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From the blog
Worth reading before you decide.
Why bifold doors stick in hot weather
Bifold doors that glide in spring can drag in a heatwave. What summer heat does to doors and tracks, what you can fix yourself and when to call us.
Why uPVC doors stick in wet weather
A door that locked fine all summer and drags in October is a seasonal pattern with a mechanical cause. What autumn does to doors, and the fix.
A new front door before winter: composite or uPVC, honestly
Composite and uPVC front doors compared honestly: warmth, security, colour, feel and cost logic, and which one actually suits your house before winter.
Where we fit
Aluminium bifold doors in Milton Keynes and the towns around it.
Each town has its own page: the homes there, what to check before you order, and who to ask about permission.