Why choose Metwin for Crittall W20 windows

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Black Crittall W20 steel shopfront window with glazing bars, showing a florist’s display of flowers in galvanised buckets
Key Features

What are Crittall Corporate W20 windows?

Crittall W20 windows, sold by Crittall as Corporate W20®, are the company’s classic external steel window. Slim rolled steel frames hold large panes of glass, so more of each opening is glass and less is frame. Steel glazing bars can divide the glass into the familiar Crittall grid, or the panes can be left clear.

Each window is made to measure by Crittall from 100% recycled steel. The frames are hot-dip galvanised against corrosion and finished in a Duralife® polyester powder coat, and Crittall gives the system a life expectancy of more than 60 years.

W20 keeps the slim profile of older steel windows, which is why Crittall describes it as ideal for listed and historic buildings. It suits conservation areas, period homes, shopfronts and offices, and sits just as well in a contemporary extension that wants genuine steel rather than a steel-look alternative.

We handle every stage: the first conversation, a site survey that takes in any conservation requirements, ordering from Crittall, installation and aftercare. If your project needs a published U-value for Building Regulations, such as a new build or extension, take a look at Crittall W20 TE windows too. We explain the difference further down this page.

Slim steel frames that keep the look of original Crittall windows
Galvanised and powder coated, with a life expectancy of over 60 years
Made to measure in any RAL or BS colour
Product Options

Tailor your Crittall W20 windows

From Crittall black to any RAL or BS shade

W20 windows can be finished in any RAL or BS colour, or a custom shade. Popular choices include Crittall black, traffic grey, agate grey, light grey, white and pastel green. We used Crittall black (RAL 9005) on the Neptune showroom in Wimbledon. Crittall applies the Duralife® powder coat in the factory, so the frames need little more than an occasional clean.

Black

Black

Traffic Grey

Traffic Grey

Agate Grey

Agate Grey

Light Grey

Light Grey

White

White

Pastel Green

Pastel Green

Double glazed, with the right glass for each room

W20 windows are double glazed and sealed with EPDM weatherseals. Crittall also offers solar control, self-cleaning and obscured glass, so you can choose privacy for a bathroom or solar control for a sunny elevation. On listed buildings, we can advise on a glazing bar layout that stays close to the original pattern.

Handles and stays, from Art Deco to modern

Crittall's casement handles range from the Art Deco feel of the Deco and the traditional Berkeley to the cleaner lines of the Phoenix and Soho, with the Arched, Straight, Scroll and Curved designs completing the set. Handles pair with straight or curved peg stays or sliding stays. Top-hung windows that open outwards can use a single folding opener, which restricts the opening to about 100mm.

Soho Handle

Soho Handle

Deco Handle

Deco Handle

Phoenix Handle

Phoenix Handle

Berkeley Handle

Berkeley Handle

Straight Handle

Straight Handle

Arched Handle

Arched Handle

Scroll Handle

Scroll Handle

Curved Handle

Curved 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

Corporate W20 specification at a glance

• Material: 100% recycled steel
• Corrosion protection: hot-dip galvanised to BS EN 1461
• Finish: Duralife® polyester powder coat in any RAL, BS or custom shade
• Life expectancy: more than 60 years
• Weather seals: dual EPDM weatherseals
• Water tightness and air permeability: 300 Pa
• Wind resistance: up to 1600 Pa
• Made under ISO 9001 and ISO 14001 management systems

Heritage Buildings

Crittall W20 windows for listed and period properties

Many of the buildings we work on still have their original steel windows. Before we recommend replacement, we check whether the frames can be restored, because conservation officers generally prefer repair where it is possible. Where replacement is the right call, W20 keeps the slim lines the building was designed with. On Wallis Road in London, a locally listed building that still had its pre-war Crittall windows, we installed Corporate W20 windows, externally bead glazed in Crittall black. Our guide to Crittall windows for listed buildings and conservation areas covers the consent process in more detail.

White Crittall W20 windows with curved heads set into the arched openings of a red brick period building
Black Crittall W20 steel shopfront window with glazing bars, showing a florist’s display of flowers in galvanised buckets
Commercial Projects

W20 windows for shopfronts, offices and commercial buildings

W20 has served commercial buildings for decades, from shopfronts to offices and former industrial premises. For Neptune’s showroom in Wimbledon, an early 20th century building over three storeys, we supplied and installed Corporate W20 windows and doors in Crittall black. See our commercial services for how we handle larger schemes.

Our Process

From first conversation to aftercare

It starts with a conversation about your building and what you want from it. We then assess the site, including any conservation area requirements, and help you choose the layout, colour, glass and hardware. Crittall makes your windows to measure, our team installs them, and we stay on hand afterwards for maintenance and genuine Crittall parts.

branding arch

Crittall Corporate W20 windows: your questions answered

Straight answers to the questions we are asked most about Corporate W20 windows.

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What our customers say

At Metwin, we take pride in our commitment to quality and customer satisfaction. Hear directly from our clients about their experiences with our products and services, showcasing the craftsmanship and reliability that define our work.

I was interested in installing A Crittall door at the back of my property, was referred to Metwin by Crittall themselves and spoke with a very helpful guy called Daniel...

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Natalie Young

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Good company. Approached them from the recommendation of Crittall. Dan and Frankie offered great advice throughout. What we noticed here, against other companies we worked with, in this project, is...

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Fred

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Very helpful throughout my project. Once I had excepted the quotation there surveyor was round within a couple of days, he took accurate measurements and talked me through the processes...

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Hannah Woolvett

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Wanted an internal door to break up two large living spaces, but still enable us to effectively leave the space open or closed depending on the mood. The Metwin product...

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Mr Lim

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Once we established what was required it was clear Metwin could help (no other company would even respond). We were looking for a cheaper solution than replacing, and Metwin came...

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Jodie

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Every time I've dealt with Metwin they have been fast to respond and keen to help in what ever way they can. Had a time sensitive job which they split...

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