Duration Windows is open for business
Please check our COVID-19 page for the latest information.

Steel Replacement Windows

Replicate Steel Windows
Cost Effective

Double Glazed

Thermally Efficient
Authentic Appearance

Easy Installation

Competitive Prices
Get A Quote Today

Steel Replacement Windows

Our Heritage aluminium windows have been designed specifically to replace existing steel windows. They replicate the appearance and slim sight-lines of traditional Steel windows, and come as close as you can get to a steel window, using a thermally broken aluminium profile. These steel look-a-like windows not only provide an authentic appearance, they offer much improved security, thermal efficiency, and come at a fraction of the cost of steel.

They are suitable for use in listed buildings, conservation areas and even listed buildings. They can be fabricated to suit almost any period property and can be specified for a wide range of applications, including new build, replacement and refurbishment, domestic and commercial projects. Retain the classic look, character and integrity of your property with our Heritage Window Range.

How To Get A Quote


Quotation requests are required in writing and prices cannnot be provided over the phone. Trade Prices require a company letter head or purchase order.

What Information Do We Require?

In order to process your quotation request and provide you with an accurate price, we require the following information (click here to see an example of the information we need):

  • The product you wish for us to quote. (i.e. aluminium windows)
  • The system you wish for us to quote. (i.e. Premium Plus Windows)
  • The product details, including; sizes, colours, glass, styles and designs for each item.
  • Any additional information, requirements or specialist instructions. (For example... I require; direct fix outerframes, internally glazed sashes, trickle vents, a 150mm projection cill etc.).

Please note: All of our products are bespoke and made-to-measure, to your exact specifications.

For more help and advice on specifying or pricing our products please call us on (01268) 681612.

Download Quote Form

Royale 'Stepped'
Steel Replacement Windows

Our slimmest windows with a depth of just 33mm, Royale Steel Replacement Windows replicate traditional steel windows. They are slim, thermally efficient, and highly secure.

More on this Window

Royale 'Putty-Line'
Steel Replacement Window

Royale Steel Replacement Windows now come with a 45° chamfer to replicate traditional putty glazed steel windows. They are slim, thermally efficient, and highly secure.

More on this Window

Heritage 'Stepped'
Steel Replacement Windows

Our Heritage Stepped Aluminium Windows have been specifically designed to be slim, thermally efficient steel replacement windows. Almost half the price of steel windows.

More on this Window

Heritage 'Putty-Line'
Steel Replacement Windows

Our Putty-line aluminium windows are designed to be very slim, thermally efficient replacement for traditional putty glazed steel windows. With optional fitter friendly clip-on A-shaped astragal bars.

More on this Window

Listed Buildings

Replicate Appearance
Of Traditional Steel Windows

Slim Profile

Aluminium Provides
Slim Sightlines

Established 1985

Successfully and Continuously
Trading Since 1985.

200+ Colours

Choose From More Than
200 RAL Colour Combinations

10 Year

Guarantee On All Products
(5 years on integrated blinds)

This site uses cookies and other tracking technologies to assist with navigation and your ability to provide feedback, analyse your use of our products and services, assist with our promotional and marketing efforts, and provide content from third parties. Cookie Policy