Trade supply only aluminium windows

Quality-made trade supply aluminium windows for residential property or commercial buildings, come with insulated aluminium profiles with a polyamide thermal break, a choice of RAL colours, double or triple glazing and stylish, locking window handles. Our windows come with several frames, vent and bead options, offering a choice of styling, for standard or new opening, bay or bow windows and corner designs. We can even crate shaped windows with gable or raked heads.

With flexible frame depths, our aluminium windows are suitable for the replacement of dated aluminium, PVCu, timber or metal windows, with minimum disruption to plaster lines and internal decoration. For new build openings, you benefit from slimline frames that are easy to fix, and in a choice of styles and opening options.

Trade Supply Aluminium Windows

Designed for residential or commercial property, a quality range of slim or classically styled aluminium windows.

Slim frame windows

Crafted aluminium windows with the latest flush casement design.

Every window made to order

Made to measure to your precise sizes, design, colour and window accessories.

New Build or Replacement

Suitable for replacement doors or new build openings, ready to fit and glaze.

white aluminium windows in a new build detached house

Premium aluminium windows

Benefitting from the best in window design and quality, 23 DOORS offer fixed or flush casement windows. Each comes expertly crafted to your precise sizes, colour, configuration and handle colour options. A selection of ancillary profiles is available with all our windows when you require extension pieces, cills, posts or poles.

Aluminium windows, made for the trade

Our residential windows provide a premium solution for older properties, available in modern or classically styled frames and customisable in the steel look with applied bars. For light commercial property, aluminium windows meet the higher-usage of offices, schools or other types of public buildings.

gable aluminium windows in a large open plan room

Windows for any property type.

Our windows range’s clever design and profile options create standard or oversized windows, including picture windows, floor-to-ceiling glazing and individual designs. Each comes with a choice of mullion, transom, vent and heading options, creating exactly the right look for any property.

Secure and Energy Efficient

All our windows comprise polyamide thermal breaks within the aluminium profiles. Combined with double or triple-insulated glass units, they comfortably meet the requirements of current Building Regulations for insulation and ventilation when fitted with trickle vents. For security, multipoint espagnolette or shoot bold locking with lockable window handles comes as standard.

black slim windows in a bathroom with balcony views

Key Features

  • Slim or standard sightlines.
  • Easy-clean or egress hinges.
  • Excellent customisation options.

Choose your from a range of window styles.

Flush Casement Windows

The familiar opening outward design is available as top hung or side hung windows, flush casement with equal sightlines.

Luxury detached dwelling with grey aluminium windows
  • Seamless flush casement.
  • Available with dummy sashes.
  • For traditional or modern property.

Window Designs

Every window is made to order, offering single windows, bay windows, corner or angled designs or combined with doors.

aluminium windows in modern empty space with suspended bench and big windows
  • Virtually any size or design.
  • Egress and easy-clean hinges
  • Choice of cills, extensions and add-ons

Product Colours

We supply our windows in black, white and anthracite grey as standard, but we can offer any bespoke colour option on request.



Anthracite Grey

RAL Colours

Reliable trade supply service

23 DOORS are specialist trade manufacturers providing quality-made and stylish aluminium windows for the trade. Desirable aesthetics, safety, security, functionality and energy efficiency make modern aluminium windows an excellent and long-lasting solution for homes and other buildings, that are also low maintenance. Our windows come in standard colours at fast lead times and great trade prices. All are supplied fully fabricated, ready to glaze or factory-glazed, depending on the window type. Beads, cills, and add-on extension pieces are provided cut to size.

Bespoke aluminium windows

Our standard colour range offers the fastest possible lead times in Black RAL 9005 matt, White RAL 9010 matt, Grey RAL 7016 matt. Or we can create windows in a dual colour finish or other standard RAL colours to order. Customise your windows with a choice of frame profiles, window handle styles and colours, optional restrictor stays, easy-clean, or egress hinges. We also provide a choice of aluminium window cills, meeting the required opening.

The benefits of modern aluminium

Slimmer than PVCu or timber, with less thermal expansion and optimum reliability. Aluminium windows are trusted for their strength, smooth operation, virtually unlimited colour choice and impressive design. The insulated profiles work with high-specification safety glass creating energy-efficient windows and helping save money on energy bills.

Flexible window sizes.

Fixed windows can create panoramic picture or floor-to-ceiling windows, limited usually by the size of the glass units. Opening window sizes are approximately 1200mm wide or 1500mm high, depending on the system for top hung windows. Maximum sizes for side hung windows are approximately 700mm wide or 1200mm high.

Frequently Asked Questions

Here we answer popular questions about aluminium windows. You can get in touch for more information and help to get the best window types and styles for your particular project.

What are the benefits of aluminium windows?

Premium aluminium profiles, a durable and high-quality colour finish, excellent components, and a choice of styles and designs make aluminium windows ideal for modern or older homes. They are also the best solution for commercial buildings, thanks to their long service life. Above all, aluminium windows are always slimmer than PVCu or timber windows, giving you more glass and light and less frame bulk. Aluminium windows usually come at larger opening sizes than PVCu windows too.

What is the best way to choose aluminium windows?

The style of windows you choose can either complement your home or create a new look. With numerous frame and styling options, colours and glass, aluminium windows can be designed in virtually any shape or size and can even create impressive picture windows or full-height glazing. They can also integrate with residential doors.

What is the best colour for aluminium windows?

Grey, white and black are undoubtedly the most popular colours right now for aluminium windows and are totally on-trend. The RAL colour range offers over 150 colours, many of which have a satin, matt or gloss option as well. You can have a different colour inside and out, a metallic finish and even textured surfaces.

What are the types of aluminium windows?

For residential property, aluminium windows typically come as casement windows, opening outwards from the top or the side. Tilt and turn windows are also popular, opening inwards for ventilation and letting you clean the outside pane of glass from inside the room. For commercial properties, the options are even greater with bottom hung, pivot and reversible windows and even parallel openings.

How long do aluminium windows last?

When you choose aluminium windows, you benefit from slimmer, stronger frames that are also some of the longest-lasting. The powder-coated finish is typically guaranteed for 15 years when correctly applied. All aluminium windows need a routine clean with a soft sponge and mild soapy solution to keep them looking new for years. PVCu windows can look dated after a number of years, and timber windows, whilst long-lasting too, do need more care.

How much do aluminium windows cost?

The size, style, frame profiles, the number of opening elements, colour, glass and handle options all affect the price you pay for aluminium windows. Therefore there is no standard price for these. Contact us for a quotation.

Are aluminium windows energy efficient?

Yes. Using the latest insulated aluminium profiles, high-specification safety glass and overall great design, aluminium windows can achieve low U-Values and good window energy ratings, depending on the glass specification chosen. These windows also meet current Building Regulations for both energy efficiency and ventilation.

How secure are aluminium windows?

Not only is aluminium one of the strongest window materials, but its great design also makes your new aluminium windows very secure. All windows come with espagnolette or shootbolt locking, glass that is secured from the inside only, secure hinges and other design elements. Quality aluminium windows are also tested to the latest security requirements for added peace of mind.