uPVC vs Aluminium Bifold Doors: Which Suits Your London Garden Extension?

Garden extensions have become one of the most popular home improvements across London, and bifold doors are almost always part of the plan. If you're deciding between aluminium and uPVC for your new opening, here's what to consider.

Why Bifold Doors Suit London Extensions

Bifold doors fold back completely, opening up your kitchen, dining room, or living space directly onto the garden. For London homes — where garden space is often limited — this creates the feeling of a much larger, brighter room without extending the footprint further than necessary.

Aluminium Bifold Doors

Aluminium is the most popular choice for bifold doors, and for good reason. The strength of aluminium allows for slimmer frames and larger glass panels than uPVC can typically achieve, which means better sightlines and more natural light — a real advantage for London extensions that often rely on rear glazing for daylight.

Aluminium bifolds also handle larger configurations well (four, five, or six-panel sets), making them suitable for wide openings on rear extensions and side-return projects, which are extremely common across London terraces.

uPVC Bifold Doors

uPVC bifolds are a more budget-conscious option and still perform well thermally. They tend to suit smaller openings better, as the bulkier frame becomes more noticeable across wider spans. If budget is the primary driver and the opening isn't especially large, uPVC remains a solid, practical choice.

Which Is Better for a Side-Return or Rear Extension?

For most London side-return and rear extension projects, aluminium tends to be the preferred specification — largely because:

• It handles wider spans with less frame intrusion

• It complements the contemporary architectural style common in extensions

• It's built to last, which matters given the investment already made in the extension itself

  
  

Things to Consider Before You Choose

• Orientation: North-facing extensions benefit from the maximum glass aluminium allows, to capture available light.

• Traffic flow: Consider how the doors fold back (left, right, or split) based on your furniture layout and garden access.

• Security: Look for multi-point locking as standard, particularly important for rear-access properties in London.

• Building regulations: Larger glazed openings need to meet current thermal and safety standards — your installer should guide you through this.

  
  

Planning Your Extension Glazing

Whether you're at the planning stage or ready to install, getting the right glazing specification early avoids costly changes later. We work with architects, builders, and homeowners across London and Essex on extension projects of all sizes.

Talk to our team about your extension project — call 020 8550 2929 or [book a free design consultation].