At Glideline, we supply a specialist range of trade supply aluminium windows for installers who are looking for a one-stop-shop for all types of aluminium windows. Our products aren’t standard fabricator windows. Every system is re-engineered and improved in-house to deliver the best possible quality, improved performance, slimmer sightlines, and a higher standard of finish.

We also offer the kinds of specialist windows many manufacturers avoid—like serving windows and frameless oriels and box windows. Whether you're quoting for a bespoke new-build, upgrading old PVCu frames, or looking for a coordinated window and door solution, the Glideline aluminium windows collection is carefully chosen to support your business, not compete with it.

We’re a trade-only manufacturer, and we’re here to help you win more work, protect your margins, and deliver projects you can be proud of and get recommendations for.

Trade Supply Aluminium Windows. One Range with Multiple Solutions.

Using tried and tested aluminium systems extensively used in both residential and commercial projects, our aluminium windows cover all the core design types you need for modern residential and light commercial projects. Each system offers best-in-class specifications, stylish design, and installer-friendly options.

• Casement Windows – GW70 Casement

Our best-selling outward-opening system, ideal for replacements or new builds. Slim sightlines and outstanding thermal performance, capable of larger sashes than competitor products and options for sashes and frame styles.

• Tilt & Turn Windows – GT70 Tilt & Turn

All the functional benefits of tilt and turn windows and capable of single or double door sizes! They include elegant, concealed, multifunctional handles and hinges without the visual bulk of other brands. Inward-opening for secure ventilation, safe cleaning, and flexible use.

• Shaped Windows – GW70 Shaped Window

Our manufacturing expertise also extends to arched, angled, and bespoke shapes. Whether you need a gable window above our bifolding or sliding doors, general shaped or gable windows, or feature glazing for self-build homes, we can help and all made-to-order.

• Serving Windows – GLS Serving Window

A unique system available in sliding, bi-folding, or top-hinged (gas strut) variants. Ideal for garden rooms, kitchen servery openings, or hospitality projects, needing a safe, secure and reliable top opening window that extends straight out.

• Frameless Oriel Windows

A product virtually no other trade aluminium window supplier offers, but we can. Box windows for seating or in a bespoke size and shape. Our Frameless Oriel windows maximise light and elevate architectural style. Structurally bonded, with optional invisible frame detailing. Perfect for high-end residential or new-build feature glazing.

And because all our exterior windows and doors come from one system, it’s easy to provide you and your end user customers complete project solution, also including roofs and rooflights. Coordinated glazing solution for your projects.

Built for Performance. Manufactured for the Trade.

Our entire aluminium window range is based on globally proven aluminium systems, to which we carry out meaningful improvements to give you something better than the mainstream systems, that always end up being a race to the bottom on price. We prefer to support you, our trade installers, with products that your homeowners don’t see in every showroom. When we partner with you, our trade supply aluminium windows offer you a lot more:

• The same latest generation premium grade 6063 T5/T6 aluminium marketed by the larger brands.

• Qualicaoat-Approved colours, including special textures and unique shades.

• Matching bifolding, single or double doors to accompany your windows.

• Custom hardware options enhacing the window appearance

• Full installation and technical support

Our entire product range is made by us – our promise to you of very high quality windows and doors that you can fit confidently, with everything provided complete and on time. Even better, our quality is so proven, our existing trade customers get fewer call-backs too.

Energy Efficiency and Compliance

Our re-engineered window systems are designed to help you meet Part L and future Building Regulations changes. Where other systems can be ambiguous as to U-Value claims, we can provide you with the data and documentation you need. Important for SAP calculations and FENSA approval. Your customers benefit from energy-efficient glazing they can trust.

We offer:

• U-values as low as 1.2 W/m²K with double glazing

• Triple glazing support on multiple products

• Help with specifications to ensure compliance

• Advice on ventilation, trickle vents, and gable configurations

• Documentation to support your quote or building inspector requirements

Built to Last, Easy to Sell

Every installer wants reliable products that are easy to fit, perform well, and look the part. Our aluminium windows deliver just that—clean lines, easy operation, high security, and long-lasting results.

• Contemporary window styling with slim sightlines

• Flush or overlapping sash options

• Multi-point locking as standard using premium lock brands,

• Internal glazing beads

• PAS 24 security upgrades

• Meticulous attention to detail you can see and feel.

You can be confident selling Glideline-made windows, because we’ve already built a firm reputation in homes all over the UK. We know exactly what the trade and the end-user customer wants from their windows.

Customisation Without Complication

For new builds and extensions, standard windows are no longer the norm. We know window designs are getting more complex, and architects and homeowers have in mind windows with more glass, less visible frames and even larger opening sizes. To help you secure more work we can create trade supply aluminium windows with:

• Unique window configurations

• Oversized sashes up to door sizes with tilt and turn windows.

• Shaped glazing, gables, raked head windows

• Comparable sightlines with Glideline sliding or bifolding doors

• Corner window solutions framed or frameless.

Our team is on hand to help with quoting, CAD drawings, technical advice or anything else you need to secure the job and complete it without hassle. 

Trusted Support for Installers

We’re not just a fabricator. We’re former installers ourselves—and we know what it takes to win work, deliver a project, and keep customers happy. That’s why we provide:

• Fast quoting and technical help

• Advice on complex configurations

• Installer training where needed

• Access to our showroom and factory for you and your customers

• Area exclusivity in selected regions

• Leads and referrals from our national marketing and website activity

We’re actively looking for installers with showrooms across the UK to showcase our window and door range. Let’s help each other grow.

Partner with Glideline for Trade Supply Aluminium Windows – Contact us Today

If you’re looking for better aluminium windows, specialist windows and complementary doors, lantern roofs and rooflights. Get in touch. At Glideline we are focused on supporting you the trade installer, not competing with you.

Talk to us today and find out how we can help your business with unique products, visibly better quality, genuine product advantages from the mainstream systems and build a long-term partnership with improved margins.

Get in touch to request a quote, view samples, or discuss becoming a Glideline trade partner.

Frequently Asked Questions

Q: What are the advantages of aluminium windows for trade installers?

Aluminium windows offer slim sightlines, more glass, less frame bulk than uPVC or timber windows. Slimmer and stronger they are also capable of bigger sash sizes as well, giving the contemporary simplified look with fewer mullions and transoms.

Q: Are aluminium windows better than uPVC?

For contemporary aesthetics, larger sash sizes, and longer-term durability, aluminium windows typically outperform uPVC. They’re also ideal for projects where matching aluminium doors is important. Glideline windows provide improved insulation and slimline styling while maintaining strength. And they’re all designed from the same unified suite of profiles for sightline consistency and appearance.

Q: What is the U-value of aluminium windows?

U-values vary by configuration and glazing, but Glideline’s re-engineered windows can achieve as low as 1.2 W/m²K dependingon the glass specification chosen. Contact us for more information. We help you meet Part L compliance and provide documentation for SAP calculations and building control.

Q: Can aluminium windows be used in conservation areas?

While aluminium windows aren’t always permitted in listed properties, they are increasingly accepted in conservation areas when designed sympathetically. Glideline offers flush casements, slim frames, and custom colours that suit heritage projects. You must always check with your Local Authority.

Q: Do aluminium windows need trickle vents to meet Building Regulations?

Yes, trickle ventilation is required under Approved Document F for most new installations. We offer discreet vent integration that preserves the window’s appearance while keeping you compliant.

Q: What glazing options are available with Glideline aluminium windows?

We offer a full range including double and triple glazing, laminated safety glass, acoustic glazing, solar control, obscure glass, and oversized units for shaped or tilt-and-turn windows.

Q: Do you supply matching aluminium doors?

Yes. All our doors and windows are manufactured to maintain matching sightlines, colours, and hardware options—helping you offer a full glazing package to your clients.

Q: How long does it take to get a quote or order aluminium windows from Glideline?

We offer super-fast quoting and manufacture in-house for consistent lead times. Most orders are made-to-order, and our trade team supports you from quote to delivery.

Q: Do you provide installation guidance or technical drawings?

Yes. We provide CAD support, spec sheets, and configuration help. Our team is available to advise on structural openings, trickle vent placement, and special glazing setups.