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TRADING SINCE 1849

Crafting beautiful steel windows and doors since the reign of Queen Victoria.

HANDCRAFTED TECHNOLOGY

High-quality, hand-crafted products that are designed to last a lifetime.

NATIONWIDE COVERAGE

Discover our exceptional products no matter where you are in the UK.

Steel T60 windows

Key Thermally Broken Steel Window Features

Our Thermally Broken Steel Window offer a host of features and benefits, these include:

Exceptional thermal performance (configuration dependent)

Crittall’s thermally broken / enhanced steel systems can achieve U-values from 0.8 W/m²K (depending on system and build-up), supporting energy-conscious commercial design.

Slim steel profiles, without the “chunky frame” compromise

Steel is chosen for clean, minimal sightlines. Thermally improved designs help retain that visual intent while upgrading insulation performance for modern building expectations.

Specifier-ready compliance route (UK projects)

Crittall products are assessed in line with BS EN 14351-1 and supplied with CE/UKCA marking where applicable, supporting a smoother specification and procurement process.

Additional Features & Benefits

Design Flexibility for Thermally Broken Steel Windows

Select finishes and hardware to suit modern commercial architecture, premium refurbishments, or heritage-sensitive work. Use the tabs below to explore Popular Colours, Hardware, and Downloads—so your team can align aesthetics, performance, and specification documentation in one place.

  • Hardware
  • Downloads

Popular Colours

Black
Traffic Grey
Agate Grey
Light Grey
White
Pastel Green

A colour to suit your project

Our Galvanised Steel Windows are available in a range of colours and finishes for you to choose from including our legendary black steel. No matter what look you’re trying to achieve, we’re sure that you can find the perfect fit for your property.

Selected: Black

Black

Selected: Traffic Grey

Traffic Grey

Selected: Agate Grey

Agate Grey

Selected: Light Grey

Light Grey

Selected: White

White

Selected: Pastel Green

Pastel Green

Hardware

Hardware

Discover the perfect finishing touches for your Crittall window with our exquisite hardware options, featuring both the timeless Classic Collection and the opulent Luxury Collection to suit every style and preference.

Soho Casement Handle

Soho Casement Handle

Phoenix Casement Handle

Phoenix Casement Handle

Deco Casement Handle

Deco Casement Handle

Berkeley Casement Handle

Berkeley Casement Handle

Arched Casement Handle

Arched Casement Handle

Straight Casement Handle

Straight Casement Handle

Scroll Casement Handle

Scroll Casement Handle

Curved Casement Handle

Curved Casement Handle

Sliding Stay With Round Knob

Sliding Stay With Round Knob

Sliding Stay With Butterfly

Sliding Stay With Butterfly

Straight Peg Stay

Straight Peg Stay

Curved Peg Stay

Curved Peg Stay

Single Folding Opener

Single Folding Opener

Downloads

  • Case Studies

Our Recent Work

Another angle of the Crittall steel-framed window showing a seamless blend with the surrounding architecture.

Ambitious project in South West London by Bespoke Design Glazing

This case study shines the spotlight on a compelling project that secured a runner-up position...

Modern property exterior featuring black crittall windows and doors with glass balustrade balcony

Restoration in rural Sussex by Lightfoot Windows

This project, executed by our specialist reseller Lightfoot Windows, focused on a listed property in...

Modern property with white facade, featuring crittall steel windows and doors

Modern renovation in South Yorkshire by KJA Services

The Crittall House of the Year (CHOTY) awards celebrate our commitment to excellence by recognising...

Exterior of Adelaide House, an office building in London

Crittall windows that truly stand the test of time

Crittall Windows recently returned to Adelaide House in London to replace the steel windows it...

Black steel french internal doors

Crittall House of the Year Award Winner 2023

Congratulations to the deserving winners of this year's Crittall House of the Year Award with...

Full installation of light grey steel bespoke windows, casement windows, and french doors

Crittall House of the Year Award – Runner Up 2023

When the owners were planning the renovation of their house, they knew they wanted to...

Compare Crittall® Window Styles

Find the right window for your project.

Thermal performance and what to specify (Uw matters)

When comparing systems, focus on the whole-window U-value (Uw) for the intended configuration, not just glazing performance in isolation. Crittall references U-values such as 1.4 W/m²K for Corporate W20 TE (as low as) and examples of 0.8 W/m²K in T60 project contexts—your final Uw will depend on size, glazing build-up, and opening type.

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Steel T60 windows handles
steel T60 windows for Trinity College

Choosing the right system: T60 vs Corporate W20 TE

If your brief prioritises maximum thermal performance, T60 is positioned as an advanced thermally broken steel system. Where you need a strong balance of heritage-compatible sightlines and improved energy efficiency, Corporate W20 TE is described as achieving around 1.4 W/m²K through its thermally enhanced approach.

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Compliance and project documentation

For UK projects, Crittall states products are assessed in line with BS EN 14351-1 and supplied with CE/UKCA marking where applicable. Keep documentation aligned with your procurement route and include the correct system references within employer’s requirements and package specs.

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Steel T60 windows in Oxford
Steel T60 windows

Sustainability and lifecycle value

Crittall presents steel glazing as a long-life choice, highlighting 100% recycled steel content and a 60+ year lifespan narrative to reduce replacement cycles and support whole-life impact thinking.

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Your Crittall® Buying Journey

Our buying guide walks you through the effortless steps to incorporating timeless Crittall products into your project, from initial inquiry to receiving your custom-made steel windows and doors.

Step 1

Enquire with Us

Start your Crittall journey by contacting us. Simply fill out our contact form and expect a response within 24 hours.

Step 2

Understanding Your Requirements

Our team will discuss your project to understand your needs and recommend the perfect Crittall supplier based on your location and requirements.

Step 3

Get Your Quote

We'll connect you with your local Crittall approved installer who will provide a personalised quote for your Crittall project.

Step 4

Purchase

Once you've reviewed your quote and confirmed your order, your custom-made Crittall windows and doors will be crafted especially for you.

Frequently Asked Questions

We understand you may have queries about our products and services. We’ve answered some of the most common questions below.

Are “thermally broken” and “thermally enhanced” the same thing?

Not always. Some systems use a full thermal break approach, while others use thermally enhanced profile design to improve U-values. Confirm the specific system details in the downloads/spec pack.

What U-values can Crittall steel windows achieve?

Crittall references U-values from 0.8 W/m²K (configuration dependent), and Corporate W20 TE as low as 1.4 W/m²K.

Do you provide CE/UKCA documentation?

Crittall states products are assessed to BS EN 14351-1 and supplied with CE/UKCA marking where applicable.

Can I specify bespoke colours?

Yes—Crittall references Duralife® epoxy-free polyester powder coating with standard and bespoke colour routes (subject to specification).

Do thermally improved steel windows help with condensation risk?

Improved thermal performance typically keeps internal frame temperatures higher than non-thermally improved metal frames, which can reduce condensation risk in occupied commercial spaces (project conditions still matter: ventilation, humidity, and detailing).

Are thermally broken steel windows fire-rated?

Fire performance depends on the tested system configuration and glazing specification. If fire resistance is required, confirm requirements with your fire engineer and request the correct certified solution from the technical team.

Can’t find the answer you’re looking for?

Speak to an Expert
Trio of french doors for London home

Start your Crittall journey

Transform your home by finding your local Crittall approved installer. Our specialist partners offer a stress-free service from enquiry to after-sales support.






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    Customer Reviews

    Take a look at some of our customer reviews to see how Crittall windows and doors have transformed real-world spaces. Customer reviews offer valuable insights beyond aesthetics, providing details on installation experiences, long-term performance, and the overall impact Crittall's windows and doors had on their projects.

    The Crittall design meant we could retain a traditional feel which would fit with the overall look of the house.

    KAREN WELSTEAD

    Scotland, UK

    All of our visitors comment on our stunning doors and we all love the beautiful shadows in the kitchen created by the frames – its like a cobweb of shadows!

    HANNAH

    SW London, UK

    ‘Nothing shouts 1930’s elegance like original Crittall windows … We feel as though we are on the set of a Poirot shoot when we walk inside’

    HARRY & VIC

    Lake District, UK

    Fully Accredited Manufacturers

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