Schüco and Cortizo are two of the aluminium door and window systems most often placed side by side on Hertfordshire quotations. Both are systems houses — they design the profiles, extrude the aluminium and supply approved fabricators, rather than making finished doors themselves. Both can produce very good residential installations. This is an honest comparison of where each pulls ahead and how to think about the choice.
Who they are
Schüco is a German systems house, family-owned, with a long history in architectural glazing. In the UK it is well established and its systems are among the most widely specified aluminium doors in premium residential work. Cortizo is Spanish, younger, more aggressive on innovation and slimmer sightlines. Cortizo's product catalogue shows the current systems, particularly the Cor Vision Plus minimum-sightline slider which is often the reason Cortizo enters the conversation.
Where Schüco tends to win
- Depth of range: Schüco covers everything from small residential windows to commercial curtain walling. This matters if you want visual consistency across doors, windows and screens in one project.
- Track record: more decades of installed base means more real-world data on how the systems age.
- UK support: Schüco UK's technical resource is well developed. Fabricators can usually get design assistance quickly.
- Front door systems: the AD UP range is one of the strongest engineered entrance door platforms on the market.
Where Cortizo tends to win
- Slim sightlines: Cor Vision Plus sliders have some of the slimmest visible frames on the market — under 20 mm at the interlock in some configurations.
- Price on comparable spec: Cortizo can be more competitive per square metre on straightforward residential doors, especially sliders.
- Recent innovation: the pace of new product releases has been notable.
Where they are effectively level
On thermal performance for standard residential windows and doors, both systems meet and exceed UK Building Regulations comfortably at their current generations. On hardware quality, both use engineered, system-specific ironmongery. On finish quality, powder-coating is done by the fabricator to the same industry standards regardless of which system is inside. On lead times, both are subject to the same broader market conditions.
The real decision variable
For most homeowners in Borehamwood the honest answer is that the fabricator matters more than the system choice at this level. A well-fabricated Cortizo will outperform a poorly-fabricated Schüco. A well-fabricated Schüco will outperform a poorly-fabricated Cortizo. Both systems are excellent when built by an approved partner who understands the details.
Local 5EC Aluminium is one of the fabricators that holds credentials for multiple aluminium systems, so if you are undecided between Schüco and Cortizo it is worth asking a fabricator with hands-on experience of both to walk you through the differences on your specific job. Their authorised aluminium supplier pages give a sense of the range they work with.
A useful rule of thumb
If your top priority is minimum visible frame and clean sightlines on a modern extension, start with Cortizo. If your priority is design consistency across a whole-house project mixing doors, windows and possibly a screen, or if you are specifying a front door alongside, start with Schüco. Either way, the installer decision is the one that will make or break the result.
Cost in practical terms
On a like-for-like four-leaf bifold set or a two-panel slider in the 3-4 m range, Cortizo often comes in a few percent cheaper on supply, though the gap has narrowed in recent years. Once installation, structural work, plastering and finishing are added in, the difference is usually small in percentage terms. The premium either system commands over unbranded aluminium is real and worth paying if you value long-term reliability and warranty support.
What we would not use to decide
Marketing photos, colour-brochure U-values quoted without conditions, and generic sightline claims. These all have an element of theatre. What matters is the actual whole-window U-value on your specified glazing, on your specified opening size, from an approved fabricator you have visited or seen the work of. Both Schüco and Cortizo can produce excellent numbers here — the question is whether the supplier in front of you can deliver those numbers on your project.
Practical next step: get quotations from a fabricator competent in both systems, on the same opening, with the same glazing spec. That way the comparison is real. In Hertfordshire and the Borehamwood area a small number of installers can genuinely offer this.