Sliding Patio Doors: A Clear, Simple Guide

Sliding patio doors are a popular choice for homeowners looking to maximise natural light while creating a seamless connection between indoors and outdoors. With large glass panels and slim frames, they’re ideal for modern extensions and open-plan living spaces.

This guide breaks down everything you need to know about sliding patio doors in the UK, including how they work, materials available, costs, and how they compare to bifold doors.

What Are Sliding Patio Doors?

Sliding patio doors are made up of large glazed panels that slide smoothly along a track. Typically, one panel slides behind a fixed pane, although larger openings can include multiple sliding panels.

Because the doors slide rather than fold, they’re perfect for homes where space is limited. This makes them a strong alternative to bi fold doors or folding patio doors, especially in narrower rooms.

Why Choose Aluminium Sliding Patio Doors?

Most high-quality sliding patio doors now use aluminium window frames, offering strength, durability and modern styling.

Benefits of aluminium sliding patio doors include:

• Slim sightlines and larger glass areas
• Excellent structural strength for wide openings
• Long lifespan with minimal maintenance
• Compatibility with double or triple glazing

Aluminium sliding doors are ideal when homeowners want uninterrupted views and a contemporary finish.

The Leading Systems Explained

Aluna Slider

• Premium-grade aluminium for durability and style
• Large sash sizes up to 2.5m x 2.7m
• Super slim 25mm interlock for maximum vision
• Double or triple glazing up to 32mm
• Excellent thermal performance (as low as 1.4 U W/m²K)
• PAS24 security compliant with optional multi-locking
• Soft-close technology for smooth operation
• Noise reduction and weatherproofing as standard
• Supports 1–11 panel configurations, including lift-and-slide
• Available in any RAL colour, single or dual finishes

If you’re looking for luxury architectural styling sliding door, this is it. You can design your own Aluna Sliding Door through our easy-to-use design software. This gives you the flexibility to choose your own custom size, colours and glazing options. Once you’ve designed you will be an instant price.

Cortizo 4700 Slimline Sliding Doors

• Slim aluminium frames for maximum sightlines and modern look
• Available in 2, 3, 4, or 6 sash configurations, up to 6400mm wide
• Double or triple track options for flexible design
• PAS 24:2022 security certified with anti-back drive shootbolt handles
• Pre-assembled panels for fast, easy installation
• Oversize glass delivery service for large panels
• Slimline trickle vents with colour-matched finishes
• Wide choice of BS or RAL colours for bespoke styling
• 10-year end-user warranty included

Sliding Patio Doors vs Bifold Doors

Choosing between sliding doors and bifold doors is one of the most common decisions homeowners face.

Sliding Patio Doors

• Fewer vertical frames
• Better views when closed
• Ideal for large glass spans

Bifold Doors

• Can fully open an entire aperture
• Panels fold and stack neatly
• Slightly more visible framework

If uninterrupted views and light are your priority, sliding patio doors are often the better option. If opening up the full width matters more, bifold doors may suit your project.

Glazing Options: Double or Triple?

Modern sliding patio doors are available with double glazed or triple glazed patio doors, helping improve thermal efficiency and comfort.

• Double glazing offers excellent insulation for most homes
• Triple glazing provides enhanced energy efficiency and noise reduction

Both options work well with aluminium frames and meet current UK building regulations.

How Much Do Sliding Patio Doors Cost?

The cost of sliding patio doors depends on several factors, including:

• Door size and number of panels
• Frame material (aluminium or uPVC)
• Glazing specification
• Colour options. Special RAL colours often come at a premium price so it’s always worth checking with your supplier if the colour you want comes at a premium cost.

As a general rule, aluminium sliding patio doors cost more than uPVC alternatives, but offer slimmer profiles and greater longevity.

Are Sliding Patio Doors Secure?

Security is a common concern with large glass doors, but modern sliding patio doors are designed with safety in mind.

Typical security features include:

• Multi-point locking systems
• Toughened or laminated safety glass
• Anti-lift protection

When correctly installed, aluminium sliding doors are highly secure and suitable for UK homes.

Where Do Sliding Patio Doors Work Best?

Sliding patio doors are commonly used in:

• Kitchen extensions
• Open-plan living areas
• Garden rooms
• Apartments and flats

They also pair perfectly with roof lanterns, flat roof windows, and rooflight skylights, helping flood interiors with natural daylight.

FAQs

1. What are sliding patio doors?

Sliding patio doors are doors with large glass panels that slide horizontally along a track. They allow plenty of natural light, save space compared to traditional doors, and are perfect for connecting indoor and outdoor spaces.

2. How do sliding patio doors compare to bifold doors?

Sliding doors have fewer vertical frames, providing uninterrupted views and a sleek modern look. Bifold doors fold back completely, opening up the full width of a space. If you want maximum light with a fixed panel, sliding doors are ideal; if you want the entire aperture open, bifold doors are better.

3. Are aluminium sliding patio doors better than uPVC?

Aluminium sliding doors offer slimmer frames, larger glass panels, superior strength, and durability. uPVC is usually more cost-effective but may have thicker frames. Aluminium is ideal for contemporary homes with large spans.

4. Can sliding patio doors be double or triple glazed?

Yes, sliding patio doors are available in both double glazed and triple glazed options. Double glazing is standard, while triple glazing offers extra insulation, energy efficiency, and noise reduction.

5. How secure are sliding patio doors?

Modern sliding patio doors are very secure. Features include multi-point locks, toughened or laminated glass, and anti-lift mechanisms. Aluminium frames also provide strength without sacrificing aesthetics.