Triple-Glazing upgrades now available across EVERY product range!

Slimline Aluminium Windows

Timeless minimalist design without the high end cost

Add the wow factor with sleek and slimline aluminium windows. The beautiful clean lines created by this product enhance the appearance of both modern and period properties.

Triple-Glazing upgrades now available across EVERY product range!

What are Slimline Aluminium Windows and Doors?

Slimline aluminium windows are a statement of modern architecture utilising larger panes of glass in slender frames to help accentuate space. They offer a true feeling of luxury, intertwining industrial aesthetic and rustic cosiness. 

While they may have only been available constructed in steel back in the infancy in the 1880s, advances in materials have made this luxury look accessible to everyone. 

By replacing the costly steel element in production, slimline heritage aluminium windows and doors maintain this chic look with all the strength and security of steel, but at a price point you’ll love for years to come. 

Key Benefits of Powder Coated Aluminium Windows

Our powder-coated aluminium window frames are available in over 120 colour combinations using only the best hardware and glazing on the market.

We use a range of Grade 1 (by which we mean non-recycled) profiles, so we’ll have something to suit your individual home and budget and each one comes with Shootbolt locking systems and internal beading fitted as standard.

Our windows are the strongest and most secure currently available on the market.

See our other types of casement windows

Flush Casement Windows

Storm Casement Windows

Timber Casement Windows

See our other products

Sliding Sash Windows


Glazing Options

Design and Installation Services


We are passionate about what we do. We will take the time to go through the ideal design specification to best suit your property and budget. We're not interested in sitting in your house for hours on end offering silly 'deals'.


All of our installers are directly employed by us and are paid a fixed salary. Unlike most other companies who use sub-contractors, our teams are given the time to ensure that your project is completed to the most exacting standards

Peace of Mind

All IBGs are NOT the same. As members of The Consumer Protection Association, our insurance backed guarantee covers 100% of the contract value. Many of our competitors offer IBGs covering as little as 25%. We are a Certass registered company.

Slimline Aluminium Windows FAQ's

What Manchester Window Factory doesn’t know about windows isn’t worth knowing, so if your question isn’t answered below, our family-run business is here to help.

Crittall windows are bespoke metal windows from the trademark of Crittall, typically starting at £600 per window, although it is common to cost upwards of £1,000. Comparatively, aluminium-framed windows cost around half this price offering a strong yet affordable alternative to this luxury look. For accurate pricing based on your requirements, get in touch with our friendly team. 

Absolutely. Because of the slimline design, it is often assumed that the glazing is single pane by default, but this isn’t the case. Slimline aluminium windows can be double glazed and triple glazed as with any other windows, and to ensure energy-efficiency in your home we thoroughly recommend it.

The contemporary yet timeless look of our aluminium windows and doors can speak volumes but when it comes to quality, MWF can boast security and versatility in design with the following benefits: 

  • Security tested to PAS 24:2016 (casement windows & fixed lights only)
  • Weather tested to BS 6375 Part 1:2009
  • British Standard Kitemark KM 81543
  • British Standard Kitemark KM 81580
  • Fixed windows,tilt turn, side hung or top hung open out casements
  • Polyamide thermal break provides enhanced thermal performance
  • Designed as a direct replacement for steel windows
  • Single or dual colour, marine quality polyester powder coat as standard
  • 316 Marine Grade Stainless Steel Hardware options
  • Heritage and Art Deco hardware options

Interested in Slimline Aluminium Windows?

We design and install with lasting peace of mind. We’ll give you an honest quote without sitting in your house for hours on end. We don’t start off with one price, then dramatically halve it after a bogus call to a fictitious boss. We don’t believe in working that way. We never have and we never will.