Choosing between aluminium and timber bi-fold doors is one of the most common decisions homeowners face when planning a rear extension or garden-facing opening. Both have genuine strengths — the right choice depends on your property, your priorities, and how much maintenance you’re willing to take on.
Aluminium Bi-Fold Doors
Aluminium is the default choice for most installers and architects in 2026, and for good reason. Modern thermal break technology means aluminium bi-fold doors now match uPVC and timber for energy efficiency, typically achieving U-values of 1.2–1.6 W/m²K — with triple glazing pushing that below 1.0.
Strengths:
- Slimmer sightlines — as narrow as 20mm on premium systems like Origin — meaning more glass and more light
- Doesn’t warp, swell, or discolour over time
- Minimal maintenance — no repainting or resealing required
- Strong and secure, supporting larger panel sizes without sagging
- Wide colour range — Origin doors are available in over 150 RAL colours
Consider: aluminium has a more contemporary aesthetic, which may not suit every period property, though modern powder-coated finishes (including heritage colours like anthracite grey and off-white) work well in a wide range of settings.
Timber Bi-Fold Doors
Timber remains the premium choice for period properties, listed buildings, and conservation areas where planning requirements or aesthetic preference call for a traditional look.
Strengths:
- Natural warmth and character that’s hard to replicate in other materials
- Often the right — or required — choice for period and listed properties
- Good natural thermal performance
- Can be finished in almost any colour or stain
Consider: timber requires more ongoing maintenance — periodic repainting or resealing to protect against the elements — and is generally more prone to expansion, contraction, and wear over time than aluminium. Cost is broadly competitive with aluminium, typically £2,000–£6,700 installed depending on specification.
Which Should You Choose?
As a general rule:
- Choose aluminium if you want maximum glass, minimal maintenance, and a contemporary finish that will last for decades with little upkeep.
- Choose timber if you’re working with a period property, conservation area restrictions, or you specifically want the natural character timber provides and are happy to maintain it.
Many homeowners are surprised to learn that, cost-wise, the two materials are often more comparable than expected — the real decision usually comes down to maintenance appetite and the character of the property rather than budget alone.
See Both in Person
The best way to decide is to see and feel both options for yourself. Visit our Bicester showroom to compare Origin aluminium bi-fold doors in person, or explore our range of sliding doors and front doors while you’re there. We install across Buckinghamshire, Oxfordshire and the surrounding counties — our team can talk you through which option makes sense for your specific project. Get in touch to book a visit or arrange a free site survey.