When you are opening up the back of the house with folding doors, the frame material makes a real difference to how they look and how much they cost. The aluminium vs uPVC bifold doors question comes down to slim frames and big spans against a friendlier price. Here is an honest comparison so you can decide which is better for your home and budget.
Aluminium gives you slimmer frames, more glass and wider spans, which is why it dominates the bi-fold market. uPVC costs less and still does a solid job on smaller openings. For most people it is a trade-off between the sleek look and the price, so let us break it down.
This is where aluminium really pulls ahead. Aluminium is strong, so the frames can be made slim while still carrying big panes of glass. That means more glass, less frame and a cleaner, more modern look when the doors are shut.
uPVC is not as strong as aluminium, so the frames and sightlines have to be chunkier to hold the same glass safely. On a small opening that is not a big deal, but across a wide run those thicker bars are noticeable and break up the view more.
If a minimalist, glass-heavy look is what you are after, aluminium is the clear winner.
Because aluminium is stronger, it can carry larger, heavier panels and span wider openings with fewer, bigger panes. uPVC bi-folds work best on narrower openings, since bigger panels put more strain on a softer frame.
So for a wide kitchen-diner opening onto the garden, aluminium handles the span more comfortably. For a modest opening, a uPVC bi-fold can do the job perfectly well and save you money.
Both can be made to insulate well with modern glass and good seals. uPVC is naturally a good insulator, while aluminium needs a thermal break, a strip of insulating material inside the frame, to stop the cold transferring through the metal. Quality aluminium bi-folds all have this built in, so a well-made aluminium door and a well-made uPVC door will both keep a Yorkshire winter at bay. The difference in real-world warmth between two good products is small, so do not let anyone scare you off aluminium on thermal grounds.
Here is where uPVC claws some ground back. uPVC bi-fold doors generally cost less than aluminium, so if budget is tight, they let you get the folding-door effect for less outlay.
As a rough 2026 guide, supplied and fitted:
These are ballpark ranges, not a quote, because the width, panel count, glass spec and groundworks all move the figure. For a firm price it is best to get a quote for your own opening.
Both are low maintenance and just need the tracks kept clean and the odd wipe down. Aluminium is extremely tough and holds a powder-coated colour finish beautifully for years. uPVC is durable too, though very large panels put more long-term strain on the frame. In terms of upkeep, there is little to choose between them; both are far easier to live with than timber.
For most homeowners chasing that slim-framed, glass-maximising, wide-span look, aluminium is worth the extra and is the reason it leads the market. If your opening is on the smaller side and you want the effect for less, a good uPVC bi-fold is a sensible, honest choice. Neither is a bad decision; it is about matching the door to your opening and your budget. You can compare both across our aluminium sliding and bi-fold doors range, and we also fit uPVC doors if you want to see the two side by side.
Aluminium bi-folds have slimmer frames, more glass and can span wider openings, which is why they lead the market. uPVC costs less and works well on smaller openings. Aluminium is the better all-rounder, but uPVC is a sensible choice on a tighter budget.
Yes, generally. As a rough 2026 guide, uPVC bi-folds often run around 3,000 to 6,000 pounds fitted, while aluminium tends to sit higher at around 4,500 to 9,000 pounds or more for a wide, high-spec set. Size, panel count and glass all affect the figure, so get a quote.
Yes. Quality aluminium bi-folds have a thermal break built into the frame plus modern insulated glass, so they keep the heat in well through a Yorkshire winter. A good aluminium door and a good uPVC door perform similarly on warmth in practice.
Aluminium. Because it is stronger, its frames can be slimmer while carrying big panes, so you see more glass and less frame. uPVC frames need to be chunkier to hold the same glass, which is more noticeable across a wide opening.
They can, but they suit narrower openings best. Wider spans put more strain on the softer uPVC frame, so for a large kitchen-diner opening, aluminium usually handles the width more comfortably with fewer, larger panels.
Want to compare aluminium and uPVC folding doors up close? Download our latest brochure, or request a free quote and we will help you pick the right doors for your opening.