Cortizo 4700 Sliding Patio Doors: A Review

The Cortizo 4700 Sliding Patio door is one of the aluminium sliding systems we fabricate and install most often across West London, usually specified where a homeowner wants a wide, uninterrupted opening onto a garden or terrace without the panel stack of a bifold. This review sets out what the system actually delivers on a typical UK project.

What the 4700 Is Built For

The 4700 Sliding Patio is Cortizo's standard sliding door platform, built around large glazed panels that run on a track rather than folding away. It suits openings where the priority is an unbroken view when the doors are closed and a smooth, low-effort glide when they are open, rather than the fully stacked-open configuration a bifold gives you.

Compared with the Cor Vision and Cor Vision Plus ranges we cover in our Cor Vision vs Cor Vision Plus comparison, the 4700 is the more conventional sliding platform, and the 4900 Sliding HI above it steps up the thermal package for larger or more exposed spans. We compare the two directly in our 4700 vs 4900 guide.

Sightlines and Panel Size

The 4700 sits among the slimmest sliding frames we fit, with narrow interlock sections between panels so the glass reads as close to continuous as a sliding system allows. Panel sizes run large, which suits a modern extension where the brief calls for maximum glass and a clean view of the garden.

Track Configurations

The system is available in two-, three- and four-track configurations, so the number of panels and how they stack on opening depends on the width of the opening and how much of it needs to fully open at once. A wider opening on a two-track configuration gives the largest single sliding panel; a three- or four-track layout lets more of the opening slide clear when fully open. This is a survey conversation rather than a fixed spec, since the right track count depends on the exact opening.

Thermal Performance and Weathertightness

The 4700 is thermally broken to the same UK performance benchmarks as the rest of Cortizo's aluminium range, reaching an A-rated energy category on a typical specification, with the exact figures confirmed at survey once glazing is chosen. For weathertightness, the system uses a multi-point locking system and a compression seal along the running track, which copes well with a typical UK garden elevation. Very large or exposed openings are better served by the 4900 Sliding HI's extra thermal package, and we will flag that at survey if your opening calls for it.

Colour and Finish

The 4700 is available across the full RAL colour spectrum with a dual-colour option, so the interior and exterior faces can differ. As with our other aluminium ranges, we run our own finishing checks in-house rather than relying on the supplier's paint booth alone.

Who the 4700 Suits

The 4700 is the right choice for most standard rear extensions and garden-facing openings where an unbroken glass view matters more than a fully open stacked configuration. Where the opening is unusually wide or exposed, or the priority is the maximum available thermal package, the 4900 Sliding HI or a bifold configuration is worth discussing at survey instead.

We fabricate and install the Cortizo 4700 Sliding Patio door in-house at our Uxbridge workshop, cutting, machining and assembling each unit to the exact opening measured on site. All our installations are FENSA registered and carry a 10-year CPA insurance-backed guarantee.

Frequently Asked Questions

What is the difference between the Cortizo 4700 and 4900 sliding doors?

The 4700 is the standard sliding patio platform, while the 4900 Sliding HI adds an upgraded thermal package suited to larger or more exposed openings. Both share the same slim sightline approach. We cover the full comparison in our dedicated 4700 vs 4900 guide.

How wide can a Cortizo 4700 sliding door opening be?

The maximum practical width depends on the track configuration chosen, panel size and the structural opening on your property. Two-, three- and four-track layouts each change how wide a single opening can comfortably run, and this is confirmed at survey.

Is the Cortizo 4700 as slim as the Cor Vision range?

The 4700 sits among the slimmest sliding frames we fit, though the Cor Vision and Cor Vision Plus ranges are built specifically around minimal sightlines and generally narrow the frame further still. Which suits your project depends on the priority given to sightline versus track configuration.

Can the Cortizo 4700 be specified in different colours inside and out?

Yes. The system is available across the full RAL colour spectrum, including a dual-colour finish with a different colour on the interior and exterior faces.

Does the Cortizo 4700 come with a guarantee?

Yes. Every Cortizo 4700 installation we carry out is FENSA registered and backed by a 10-year CPA insurance-backed guarantee.