buying guide
23 October 2026
Aluminium Windows: A UK Buyer's Guide
How to choose aluminium windows in the UK: casement or flush sash, opening types, sizes, glass, Part L, trickle vents, certification, prices and lead times.
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Aluminium Doors
& Windows Manufactured in Leeds
Cortizo aluminium systems, precision-crafted in Leeds and delivered across the UK. Contact us for an agreed delivery date — with exceptional lead times for trade and retail.
Why Choose Us?
Manufactured in Leeds
Proudly fabricating out of our state-of-the-art UK facility. Complete control over the supply chain ensures strict quality standards and zero middle-man delays.
Aluminium doors & windows in Leeds
Official Systems Partner
Crafted exclusively using premium European aluminium profiles, internationally renowned for ultra-slim sightlines and industry-leading thermal efficiency.
2
Day Lead Times
In-House Fleet
Delivered direct to your site on our own dedicated vehicles.
How It Works
From quote to delivery in three simple steps
01
Request Your Quote
Send us your drawings or specification. We'll provide a competitive quote within 24 hours.
02
Confirm Your Order
Once approved, we manufacture your order in-house at our Leeds facility using Cortizo systems. You'll receive an agreed delivery date.
03
Delivered on Your Agreed Delivery Date
Your order is delivered kerbside on your agreed delivery date via our fleet, anywhere on the UK mainland (NI and islands to the connecting port).
Lead Times
Mazuli delivers on its own fleet, so you get a delivery date when you order and it rarely moves
2-5Working days
Unglazed
Standard Colours (Subject to Order Quantity)
6-10Working days
Glazed
Standard Colours (Subject to Order Quantity)
2Weeks
RAL Colours
4–6Weeks
Woodgrain Colours
Trusted by
As Seen On TV
Featured on George Clarke's Kitchen vs Garden
Watch our aluminium doors and windows being fitted on the popular Channel 4 show — from fitting to the finished result
Our Latest News and Insights
Get In Touch
Have a question or looking to speak to an account manager? We'd love to hear from you
Visit us
Wellington Bridge Street, Leeds
Typically responds within 24 hours
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