How Much Do Cortizo Cor 70 Hidden Sash Windows Cost in the UK?

Cortizo Cor 70 Hidden Sash is the flush casement window in Cortizo's aluminium range, and homeowners comparing it against standard casement or uPVC options want to know how much further it pushes the budget. There is no fixed figure that applies to every project, because the price is built from your specific opening, finish and glazing choice. This guide explains what moves the number and how to get a figure that actually applies to your home.

What Cor 70 Hidden Sash Is

The "hidden sash" name describes the window's defining feature: the opening sash sits flush with the outer frame instead of protruding, giving a clean, uninterrupted line from outside that reads closer to a period timber window than a typical modern casement. That flush appearance requires more precise engineering in the frame and hardware than a standard casement, which is part of why it sits at a different price point to a basic aluminium window.

Why Cor 70 Pricing Varies

Four things drive the total on a Cor 70 project: the number and size of openings, the glazing specification, the colour or finish, and the complexity of the opening itself. A single small window costs proportionately less to fabricate and fit than a full run across an elevation, and a bespoke RAL colour or dual-colour finish sits above the standard powder-coat range. Because every Cor 70 window is fabricated to the exact opening at our Uxbridge workshop rather than supplied as a stock size, the only way to see where your project lands is a survey.

What Drives the Price Up

Larger openings and a higher number of windows increase the total simply through more profile, more glass and more fabrication time. Upgraded glazing, acoustic or enhanced solar control glass, adds to the specification. A bespoke colour, particularly a dual-colour finish that matches an internal decor scheme to a different external shade, sits above standard anthracite or white. Difficult access, such as upper-floor installation requiring scaffolding, also adds to the overall project cost outside the windows themselves.

What Keeps the Price Down

A modest number of standard-size openings in a single standard colour, on a straightforward like-for-like replacement, sits at the more accessible end of the range. Cor 70 in a common finish on ground-floor openings with easy access is the most cost-effective way to specify the system.

Cor 70 vs Standard Aluminium Casement

Homeowners often ask whether the flush look is worth the premium over a standard casement. Cor 70 typically commands more than a basic aluminium casement for a comparable opening, reflecting the extra precision the flush sash requires. Where the brief specifically calls for a period-appropriate or architecturally cleaner line, particularly on a conservation-sensitive property, that premium buys a genuinely different aesthetic rather than a marginal upgrade. Where the priority is simply replacing draughty windows on a budget, a standard aluminium casement may be the more sensible specification.

Getting an Accurate Figure

Because so much depends on the number of openings, sizes, glazing and finish, a survey is the only reliable route to a number you can act on. We measure every opening, confirm specification with you on site, and issue a fixed quote before any work begins.

We fabricate and install Cortizo Cor 70 Hidden Sash windows in-house at our Uxbridge workshop. Every installation is FENSA registered and carries a 10-year CPA insurance-backed guarantee.

Frequently Asked Questions

Is Cor 70 more expensive than a standard aluminium window?

Generally, yes. The flush sash design requires more precise fabrication than a standard casement, so Cor 70 typically sits above a basic aluminium window for a comparable opening. The exact gap depends on your specification.

What has the biggest effect on the price of a Cor 70 project?

The number and size of openings, the glazing specification, and the colour or finish are the three main factors. A large run of windows in a bespoke dual-colour finish with upgraded glass sits well above a single standard window in a common colour.

Can Cor 70 be used on a conservation area property?

Cor 70's flush profile is designed to give a period-appropriate appearance, which makes it a common choice on conservation-sensitive properties, though any planning requirements should be confirmed with your local authority before ordering.

Does the quote include installation?

Our quotes cover full supply, fabrication and installation, including removal of existing windows where applicable. Any additional building work is scoped and priced separately once confirmed at survey.

Can I get an accurate price without a survey?

Not reliably, since every Cor 70 window is fabricated to the exact opening. An accurate figure depends on the dimensions, glazing choice and finish confirmed on site.