Capital Windows

Capital Windows Celebrating 35 Years

Capital Windows offer a dedicated and focused trade supply service, providing fabricated aluminium doors, windows, bifolding doors and a range of quality commercial systems.

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Capital Windows Celebrating 35 Years


Discover the largest range of Aluminium and PVCu window solutions to help you grow your business.

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A range of high quality entrance doors, bifolding or sliding doors for residential and commercial projects.

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Get a Quotation

Click to send us an enquiry and we will get back to you to discuss your project.

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Visit Our Showroom

Our comprehensive and modern showroom showcases our range of high quality aluminium and PVCu products.

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Capital Windows are reliable, flexible and experienced

If you are looking for a reliable, flexible and highly experienced trade manufacturer of fabricated windows and doors, we are your local, trusted supplier. Don’t miss out on the growing aluminium market.

We provide products from the major names in architectural aluminium all of which are widely specified and approved by architects and main contractors. All the aluminium systems we offer have been used in some of the finest buildings all over the world.

How Capital Windows can help you as your trade partner

Trading since 1979, we are long established and understand the home improvement sector at residential and commercial levels.

If you are already experienced in the aluminium sector, let us work with you as a trusted supplier offering an excellent supply only service.

Perhaps you have never sold aluminium before and are keen to enter the growing market in commercial and residential aluminium. Capital Windows Trade can help you with support, training and experience in the right aluminium products.

Here are just a few advantages to partnering with us as your trade manufacturers

  • Trusted Reliable Supplier – we have been trading since 1979
  • Your aluminium one stop shop – a wide range of products all available from one supplier
  • Competitive prices and lead times
  • Simple processes – we work with you to help you order your products quickly and easily
  • Fast and reliable delivery
  • Comprehensive showroom to view our products
  • Showroom samples, sales and marketing support


Talk to us about your project

An excellent range of residential and commercial aluminium systems

With a range of fabricated aluminium windows and doors from the leading systems companies such as SAPA Building Systems, AluK Systems and Schuco, we provide a complete range of products that can help you sell more aluminium in both residential and commercial markets.

Do you currently buy in fabricated aluminium windows and doors?

Why not let Capital Windows demonstrate our exceptional trade supply service? We are not tied to any system and will work with you on providing the right products for your target market. We have the right product for your construction project and can offer you expert and impartial advice.

Reynaers Aluminium Systems

Our Reynaers suite of architectural aluminium doors offers you a real market edge with bifolding and sliding doors that are exceptional in quality and design.

Reynaers bifolding doors benefit from four different threshold/cill options.  High Performance, Medium Performance, Low Threshold and Flat Bottom give ou a versatile and flexible folding door.

Larger and heavier doors can be provided to span wide openings.  8 door leafs and up to three metres in height can be made.

Reynaers sliding doors are designed for slimness with strength and an impressive modern appearance. They can be made at up to very large sizes and come in a choice of single, double or triple tracks.

Reynaers doors come with superb quality hardware that is distinctive, durable and aesthetically pleasing.

If you’re looking for a product that sets your business apart from the competition, we recommend you contact us about Reynaers bifolding and sliding doors.

SAPA Building Systems

SAPA Building Systems have been an influential aluminium systems company in the UK for over four decades. Capital Windows are one of the longest established SAPA manufacturers in the UK.

With a comprehensive product range, dedicated specification staff and an excellent track record in commercial projects nationwide, SAPA offer some of the very best aluminium door, window, curtain walling and facade glazing solutions. These include:

  • A wide range of window solutions including casement, tilt and turn, pivot, projecting, fire rated and protection systems.
  • High performance commercial entrance doors and ground floor framing
  • Doors and windows for residential developments such as apartments, flats and houses.
  • Sophisticated curtain walling systems available as unitised or stick construction
  • A range of protection systems such as fire rated, blast resistant and high security

AluK Systems

AluK was established 30 years ago under the well respected Beaufort brand name and is now one of the leading aluminium systems companies in the UK.

With a diverse and advanced product range, Capital Windows manufacture a AluK products that offer excellent performance, high energy efficiency and performance. AluK products have been installed in a wide variety of housing, commercial, healthcare, hospitality and retail developments. The product range includes:

  • High performance aluminium windows, residential doors and specialist windows such as steel replacements.
  • A range of curtain walling and facade glazing solutions.
  • Leading sliding doors and bifolding doors
  • Maximum security commercial entrance doors

Rehau PVCu Systems

Rehau is one of the leading PVCu systems companies in Europe and the UK offering a diverse range of PVCu products widely used in commercial applications.

The Rehau range of PVCu products includes:

  • Window systems for casement, tilt and turn and reversible windows.
  • Sliding patio doors and lift and slide patio doors
  • Conservatory systems
  • Ancillary profiles such as window boards, trims, facias and more, used in construction.

Get a Quote

Our products are custom made for your project. Simply complete the form below we will contact you to discuss your project.

How Capital Windows protects your information

CE Documents

Review our CE accreditation

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Our Promise

We're determined to ensure the highest quality and the best experience for every customer.

Capital Windows Blog

Comparing Reynaers Sliding Doors to Smarts and AluK

The residential aluminium market is buoyant and healthy. Bifolding doors and sliding doors are enjoying continued growth as homeowners and the home improvement industry benefits from the advantages of large span doors.

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Comparing Reynaers Bifolding Doors with AluK and Smarts

AluK and Smarts bifolding doors are arguably the most common bifolding doors you can buy. They are splendid bifolding door systems. Otherwise, they would not be so popular. However, with popular systems come inevitable problems with oversupply and increased competition.

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