Grey aluminium bifold doors have become the go to look for opening a room up to the garden, and it is easy to see why. Slim frames, a crisp finish and big panes of glass suit almost any home, from a Victorian terrace done tastefully to a bright new build. Here are some design ideas to help you picture the look and get the details right.
Why aluminium suits bifolds so well
Aluminium is strong enough to hold large panes in slim frames, which is exactly what a bifold needs. Less frame, more glass, and clean lines that look sharp whether the doors are open or closed. The powder coated finish also holds its colour well against the Yorkshire weather, so the look you choose is the look you keep.
That combination of strength and slimness is why the best bifolds are almost always aluminium, and why the design possibilities are so wide. Our aluminium sliding and bi-fold doors come in a broad range of finishes for this reason.
Grey: the modern classic
Anthracite grey is the most popular bifold colour by a distance, and it earns its place. The matt grey finish looks contemporary without shouting, works against red brick, pale render and grey render alike, and pairs neatly with grey window frames for a joined up look across the house.
Design ideas with grey: - Anthracite grey outside, white inside, so the doors read modern from the garden but keep a light, neutral feel indoors. - Grey throughout, for a bold, consistent look that suits open plan kitchens and extensions. - Grey frames with a flush threshold, for that seamless step out to a patio or garden room.
Grey suits period homes too, softening the modern edge of a big glass opening so it does not jar against older brickwork.
Black: bold and architectural
Matt black bifolds are the choice when you want the doors to make a statement. Black frames read as crisp lines around the glass, almost like a picture frame for the garden view. They look superb on both contemporary extensions and characterful older homes, echoing the black steel Crittall style windows that suit period properties.
Black works especially well: - Against white or pale render, for a striking contrast. - Paired with black window frames and black hardware, for a pulled together, architectural feel. - In a garden room or orangery, where the dark frames frame the greenery outside.
If you love the heritage steel look, our heritage aluminium windows and doors recreate that slim black profile with modern warmth.
Dual colour: best of both
You do not have to pick one colour for inside and out. Dual colour bifolds let you have, say, anthracite grey or black facing the garden and a soft white or grey inside to keep interiors light. It costs a little more but gives you the exterior drama and the interior calm in one door.
Design details that lift the look
The colour is the headline, but the details make it: - Slim sightlines. The thinner the frames, the more glass and the better the view. Ask about the sightline width. - Threshold choice. A flush threshold gives a near level, seamless step out, ideal for a garden room feel. A weathered threshold suits exposed openings. - Handles and hardware. Match the metal to the frame, black on black, or brushed steel for a softer contrast. - A traffic door. A single leaf that opens on its own for everyday garden access, so you are not folding the whole set back to let the dog out. - Corner opening bifolds. On the right room, a set that opens around a corner with no post removes the wall entirely for a dramatic indoor outdoor space.
Making it work with your home
The best bifold design is the one that suits your house. On a modern extension, go bold with black or full grey and slim frames. On a period home, grey often sits more comfortably against old brick, and matching the frames to your windows keeps everything tidy. For a garden facing living room or a new orangery, the doors become the main event, so it is worth spending on the finish and glazing.
As a rough 2026 guide, aluminium bifolds run from around 2,500 to 6,000 pounds and up supplied and fitted, depending on size, colour and the number of leaves. Dual colour and premium finishes add a little. Prices vary a lot with the opening, so get a quote for your own home.
FAQs
Are grey aluminium bifold doors a good choice?
Yes. Anthracite grey is the most popular bifold finish because it looks contemporary without being loud, suits red brick, render and grey homes alike, and pairs neatly with grey window frames. The powder coated finish also holds its colour well outdoors.
What is the most popular colour for aluminium bifold doors?
Anthracite grey is by far the most popular, followed by matt black. Both suit modern and period homes, and dual colour options let you have a bold shade outside with a lighter finish inside.
Do black bifold doors suit older homes?
They can look excellent. Black frames echo the slim steel Crittall style windows found on period properties, so they suit characterful homes as well as contemporary extensions, especially against pale render or brick.
Can I have a different colour inside and out?
Yes, with dual colour bifolds. A common choice is anthracite grey or black facing the garden and white or grey inside to keep the room light. It costs a little more but gives you both looks in one door.
How much do aluminium bifold doors cost?
As a rough 2026 guide, around 2,500 to 6,000 pounds and up supplied and fitted, depending on size, colour and the number of leaves. Dual colour and premium finishes add a little. Get a quote for your own opening.
Want to see the grey, black and dual colour finishes in the flesh? Download our latest brochure, or request a free quote and we will come and take a look.