Comparing Aluminium vs. steel windows

Many homeowners get in touch asking for help and information to change their old steel windows with a credible aluminium alternative. The steel window replacement market is growing, with the majority of aluminium systems companies providing a steel replacement version of their aluminium window systems. When it comes to comparing aluminium vs. steel windows, which is best?

The history of The Crittall Window Company Limited and the Crittall® range of windows is well documented. Not only are Crittall the oldest window company in the world, but their range of steel windows and doors is also still widely used in residential and commercial property.

If you are thinking about replacing your old steel windows, we take a look at the key differences between a steel window such as those made by Crittall and the aluminium alternatives.

Aluminium vs. steel windows.  Why compare the two materials?

Many homeowners love the look of steel windows and want to recreate the metal window look in their home. We have worked with clients that have replaced their windows and doors and even provided New York style screens inside their homes. All of these products were made of aluminium. However, there is a strong argument that nothing beats the look, feel and manufacturing expertise of an authentic steel window. The reality is, as good as aluminium steel replacement windows can be, they will not possess some of the features found in a steel window. It makes sense therefore to compare aluminium vs steel windows and see what each can offer the customer.

For homeowners looking to change their steel windows with a suitable alternative, it is worth researching what both materials can offer so they can come to an informed decision.

How much do aluminium steel replacement windows cost?

Aluminium steel replacement windows will be cheaper than their steel counterparts. On price alone, aluminium as a steel window replacement is cheaper and within the budget of most homeowners. However, it is important to understand why steel windows are much more expensive. Much of this comes down to the entire manufacturing process that is very different to aluminium. Steel as a raw material is also more costly.

Comparing aluminium vs. steel casement windows.

Taking a typical steel and aluminium casement window there are several differences between the two. However, let us first dispel some of the myths about modern steel windows. Today’s steel windows are:

• Incredibly secure utilising a variety of locking methods and passing current security tests with excellent results.
• Thermally efficient to meet current Building Regulations.
• Available as double glazed and fully weather-stripped windows with insulation.
• Available in the full range of RAL, Syntha Pulvin and BS colours as well as other special finishes you cannot get in aluminium.

Feature	Modern Steel Window	Aluminium Steel Replacement Window	Original Steel Window
Glazing	Double Glazed	Double or Triple Glazed	Single Glazed
Strength	3 times stronger than aluminium	3 times weaker than steel	3 times stronger than aluminium.
Security	Meets all current standards	Meets all current standards	Basic locking
Manufacturing	Fully welded window	Crimped and mechanical joints	Fully welded window.
Traditional Hardware	Yes mostly welded to the window	Yes, mostly screwed or riveted to the window.	Yes
Narrow Sight Lines	Steel can be slimmer than aluminium.	Aluminium is not as slim as steel	Steel can be slimmer than aluminium
Life Expectancy	60+years excluding paint finish.	30-40 years excluding paint finish.	Crtittall windows still functioning in buildings since the 1920’s
Thermal Performance	Meets Current requirements.	A Rated Windows Available	N/A
Colour choice	Full RAL availability	Full RAL availability	Limited choice.
Dual colour option	Yes	Yes	No
Rust Protection	Yes	Aluminium does not rust	No
Availability	Specialist Companies	Anyone can fit aluminium	Specialist Refurbishment only
Modern or Traditional Products	Yes	Yes	N/A
Large Open Sashes	Virtually unlimited large sizes.	Typically 3m2 maximum	Virtually unlimited large sizes
Curved heads and Curved on plan	Yes	Yes	Yes
Fire Rating of the frame	Typically 30 minues	No fire rating	N/A
Residential and Commercial Use	Yes	Yes	Still in use today
Recyclable	Yes	Yes	Yes

Aluminium Steel Replacement Windows Key Features.

• The more cost-effective option.
• Can be triple glazed.
• Offers better acoustics if required.
• More widely available.

Steel Windows Key Features.

• Aluminium is not as strong as steel
• Slimmer and enables bigger opening doors and windows.
• Fully welded construction.
• Longer Lifespan
• Available through specialist installation companies.

Both Steel and Aluminium windows deserve their place in the market.

Many people have a negative perception of steel windows, and it is important to present steel in a positive light. Study our table, and you will see they are just as good as aluminium.

It is up to the homeowner to make the best decision on aluminium vs. steel windows, based on their budget and requirements. However, the old perception of steel windows being single glazed, draughty and unsuitable for residential use is no longer valid with the current range of products. Aluminium is an excellent alternative, but steel provides some useful features as well.

Images show Smart Systems Alitherm Heritage 47 windows, manufactured and supplied by Everglade Windows of Middlesex.

Crittall® is a registered trademark of Crittall Windows Limited and is unconnected to the Aluminium Trade Supply Website.