Technical information notice. Technical information on this page is general product-selection guidance, not a certification, compliance statement, design calculation or order confirmation. Before relying on a figure or standard, request current evidence for the selected product route, size, glazing, hardware and project. See our technical information.
Comparison
Aluminium vs uPVC Windows and Doors
Aluminium wins on strength, slim sightlines, span and lifespan; uPVC competes mainly on upfront price. For trade projects where spec, large openings and long service life matter, aluminium is the stronger choice. VitrineAlu fabricates and supplies aluminium to the trade across the North West. Tell us what you need and we quote the right system. Get a quote.
Trade onlyWe fabricate and supply installers, builders, architects and joiners. Homeowners are routed to vetted installers through our installer referral route.
Haydock fabricationUnits are made in our own workshop in St Helens.
North West EnglandFabrication and supply across the region.
Which is better, aluminium or uPVC?
For most trade specifications, aluminium. It carries more glass on a slimmer frame, spans larger openings, and lasts longer in service. uPVC holds an advantage on upfront cost and on entry-level thermal figures, which is why it still suits budget-led domestic work.
The honest answer is project-led. Where the brief calls for big glazed areas, narrow sightlines, structural spans or a long maintenance-free life, aluminium earns its premium. Where the only driver is lowest initial price on a standard-size opening, uPVC can be the pragmatic call. The exact spec varies by system and is quote-confirmed.
Request current product evidence for the selected route, size, glazing, hardware and project before relying on the specification.
How do they compare on thermal performance?
Both can hit current targets, but the routes differ. Modern aluminium uses a polyamide thermal break, and across our window and door systems Uw figures start from competitive numbers where specified.
Verified aluminium figures we work to: casement and window Uw from 0.85, bifold Uw from 0.9, sliding Uw from 1.0, entrance from 1.1, and a high-insulation tilt-turn route from 0.71. Curtain walling reaches Ucw from 0.6 where specified. uPVC competes at the budget end on a like-for-like sash, but it cannot match aluminium on slim frames at the same glass area. Confirm whole-unit Uw at quote.
| Casement and window | Uw from 0.85 |
|---|---|
| Bifold | Uw from 0.9 |
| Sliding | Uw from 1.0 |
| Tilt-turn (high-insulation route) | from 0.71 |
| Entrance door | from 1.1 |
| Curtain walling | Ucw from 0.6 where specified |
What about sightlines and glass area?
Aluminium is stronger than uPVC, so frames are thinner for the same opening. That means more daylight and a cleaner line, which is why architects specify it for big glazed elevations.
On bifolds, leaves run to 1.2 x 3.0m and 130kg, up to 14 leaves, with around 90% clear opening. On sliding, sashes reach 2.2 x 2.87m and 420kg on a 35mm interlock, with roughly 50 to 65% clear opening. Curtain walling carries units to 1.5 x 3.6m and 350kg on a 66mm sightline. uPVC sections are bulkier and span far less before they need reinforcing or extra mullions.
Strength, span and security
Aluminium is the structural choice. It holds large sashes and tall spans without the frame deflection that limits uPVC, and it takes weather and impact testing to high classes where specified: weather to air permeability Class 4, watertightness Class 9A and wind Class C5.
Security is engineered in. We offer PAS 24 routes, including PAS 24:2025, across the relevant systems. Acoustic performance runs to Rw 46 dB where specified. See security for the detail.
Lifespan, maintenance and finish
Aluminium lasts. A powder-coated aluminium frame holds colour and shape for decades with minimal upkeep, and it will not warp, yellow or sag the way uPVC can over a long service life.
Finish options are wider too: any RAL colour, matt or gloss, dual-colour inside and out, and consistent colour across windows, doors and curtain walling on the same project. uPVC colour choice is narrower and foiled finishes can fade or peel over time.
Cost: where uPVC wins and where it does not
uPVC is cheaper to buy. On a standard-size, standard-spec window it will undercut aluminium, and for tight-budget domestic work that can decide it.
Aluminium closes the gap over the life of the building through durability, lower replacement frequency and stronger resale on the finished work. On large openings, slim-sightline glazing and commercial spec, aluminium is often the only route that meets the brief, so the comparison stops being about price.
Which should you specify?
Specify aluminium for large glazed areas, slim sightlines, structural spans, commercial work and long-life projects. Consider uPVC where the only driver is lowest upfront cost on standard openings.
Not sure which fits the job? Tell us the opening sizes, performance targets and finish, and we quote the right system. Browse products or go straight to a quote. For energy targets, see energy efficiency; for trade terms, see trade.
Common questions
Is aluminium better than uPVC for windows and doors?
For most trade projects, yes. Aluminium is stronger, so it carries more glass on a slimmer frame, spans larger openings and lasts longer with less maintenance. uPVC mainly wins on upfront price for standard-size openings. VitrineAlu fabricates and supplies aluminium to the trade across the North West.
Is aluminium more energy efficient than uPVC?
Modern thermally broken aluminium competes closely and, on slim frames at the same glass area, often outperforms uPVC. Verified figures we work to include casement and window Uw from 0.85, bifold from 0.9, sliding from 1.0, entrance from 1.1 and a high-insulation tilt-turn route from 0.71. Confirm whole-unit Uw at quote.
Does aluminium last longer than uPVC?
Yes. A powder-coated aluminium frame holds colour and shape for decades with minimal upkeep and will not warp, yellow or sag the way uPVC can over a long service life. That durability is a large part of why aluminium costs more to buy but less over the life of the building.
Is aluminium more secure than uPVC?
Aluminium is the stronger material and supports engineered security. We offer PAS 24 routes, including PAS 24:2025, across the relevant systems, with weather and impact performance to high classes where specified. See security for the detail.
Why is aluminium more expensive than uPVC?
Aluminium costs more to buy because the material and fabrication deliver greater strength, slimmer sightlines, larger spans and a longer service life. On large openings, slim-sightline glazing and commercial spec it is often the only route that meets the brief, so the comparison stops being about upfront price.
Can I buy aluminium windows and doors direct from VitrineAlu?
We are a trade fabricator and supplier. We supply installers, builders, architects and joiners. Homeowners are routed to vetted installers via find an installer rather than sold direct.
Related guidance
Continue your project research
Relevant product routes