Whilst aluminium enjoys a renaissance with contemporary design, it has always remained a popular choice for period or traditional properties too. Whether you’re looking to replace existing steel or Crittall® windows, maintain a slimmer sightline, restore a more period character look to your home, or if you are in a listed building or conservation area, then our traditional aluminium windows are a perfect choice.

With many properties from the 1920s-1950s, or pre-1880, having slim metal windows, the existing opening dimensions can be better suited to a slimmer frame to maximise the glass area and original proportions.

Our traditional aluminium range is available both internally and externally glazed, depending on your preference. We can also offer a choice of a bevelled casement and frame detail, as well as a completely unique fully featured internal mullion and outer frame.

Classic-AL Internally Glazed Aluminium Window, Bevelled CasementInternally Glazed Aluminium Window, Bevelled Casement – Exterior

Classic-AL Internally Glazed Aluminium Window, Bevelled CasementInternally Glazed Aluminium Window, Bevelled Casement – Interior

Classic-AL Externally Glazed Aluminium Window Section, Bevelled CasementExternally Glazed Aluminium Window Section, Bevelled Casement – Exterior

Classic-AL Externally Glazed Aluminium Window Section, Bevelled CasementExternally Glazed Aluminium Window Section, Bevelled Casement – Interior

Our traditional aluminium range offers a fixed sight line of as little as 47mm and our casement-to-casement dimension is one of the narrowest on the market at just 112mm! With low ‘e’ double glazing, the window offers an overall u-value of 1.6w/m²k – in line with building regulation requirements. For more energy efficient projects we also offer a composite alu-clad system from Internorm, with fully sculpted outer frame and casements which will achieve anything up to 0.69w/m²k and is fully Passivehaus certified.

Classic-AL Internally Glazed Aluminium Window, Bevelled CasementInternally Glazed Aluminium Window, Bevelled Casement

Classic-AL Externally Glazed Aluminium Window Section, Bevelled CasementExternally Glazed Aluminium Window Section, Bevelled Casement

We have a stock range of powder coated finish colour options including white, anthracite grey and black, which are available on reduced lead times. We are also able to offer any RAL colour subject to preference and final design.

Our traditional aluminium system also offers a full residential door range for single doors and French doors, as well as an In-Line Slider suitable for openings of up to 4000mm. The aluminium window can also be combined perfectly with our bespoke aluminium bi-folding and sliding door solutions from Solarlux and Internorm for larger opening sizes and higher performance.


Our products are designed and custom made to suit your chosen style and property. Therefore,  giving you a quote before speaking to you or seeing your home, isn’t possible. However, we can give you the following commitments:

  • Our prices for a like-for-like traditional aluminium window will be very competitive
  • Our designers are there to help and advise so that you enjoy the experience
  • Our passion for excellence and design ensures we will suggest the best solution for your project
  • We provide you with a full breakdown quotation, giving you complete visibility of your options and choices
  • We can provide you with full colour 3D visualisations, allowing you to explore options that you may not have considered, with complete peace of mind. Find out more >
  • We encourage you to visit our showroom before making a decision so that you can select the frame shape, colour, finish and handles allowing you to personalise your windows and doors to suit your taste and budget
  • With more than 30 years’ experience, BSI accreditation and ISO 9001 certification, you can be assured that your home will be in very safe hands with Thames Valley Windows
  • Our overall aim is to provide value for money with the best products and service available in the industry


Metal windows

have been used for centuries, way back in Tudor times in the fifteenth and sixteenth centuries. The Georgian period saw timber take over as the most popular option and this carried on through the Victorian and Edwardian times. In the 1920s and 30s, steel windows took centre stage once again, most notably through the Art Deco period with a very distinct dual bar design.

Traditional steel windows are still around today. A combination of their strength, very slim profiles and often intricate designs can mean they add character and charm to a property. However, you may be looking to replace your steel windows for something more modern. You’ll want the design to remain sympathetic to your home but you’d also like the benefits that come with today’s demands on thermal performance and security.

Steel windows can be fitted directly in to brickwork or stone mullions but over time these would rust in to place. Replacing these is not an easy job. Angle grinders are needed to get the steel windows out and if they are to be replaced with a more modern window, the new frame is likely to be wider meaning the internal plaster lines need to be cut back. When the metal windows are fitted in to hardwood timber frames this makes replacement much simpler. The timber is easier to remove; the proportion of the timber frame is also more closely linked to the modern replacement meaning less work on the surrounding area.

Crittal® Windows is the biggest manufacturer of replica steel windows today however, they don’t come cheap. An alternative solution is the Heritage Aluminium Window. These have been specifically designed to replace traditional steel windows – and at a fraction of the cost. With Heritage Aluminium Windows, you do not lose any of the character or authenticity that steel windows offer, but you gain from modern security and thermal efficiency.

Heritage Aluminium Windows are used in new build and refurbishment projects. They are designed more for traditional properties but can also provide an ultra slim-line option for a contemporary look. They are suitable for listed buildings and homes in conservation areas. They are also one of the slimmest profiles of all the window styles available. A frameless appearance is a much sought after look for those who desire a modern, clean look. Aluminium windows can be fitted directly in to brickwork, hardwood frames or stone mullions and can be slimmer than a frameless, butt-jointed silicon-sealed glass to glass joint!

Heritage Aluminium Windows are polyester powder coated to ensure they remain rust free and will not need to be painted for twenty years plus. Frames are available in any RAL colour and you can choose a different colour for the outside frame and the inside frame to compliment your décor.

Aluminium windows are available in any size and with various hinged opening configurations. There’s also a choice of ironmongery to complete the traditional look of the window, or you may wish to add a more modern window handle.

Let’s not forget about the glazing either. It’s possible to retain an existing leaded or Georgian design and double glazing will often replace single glazing meaning your heating bills will be lower.

The double glazing boom

began in the 1970s with the introduction of aluminium windows, sliding patio doors and secondary glazing.

By the 1980s, property prices were starting to increase, uPVC windows were introduced to the UK from Germany and replacement windows were all the rage. Aluminium was a cold material and the thermal break systems weren’t effective, causing the frames to condensate (sweat) in the colder months. uPVC was warmer. Outward-opening uPVC windows were externally glazed (the glazing beads were fitted on the outside) and were installed with poor security ‘cock-spur’ handles. Georgian window styles could now be achieved using a white bar in-between the window panes and leaded designs were rife. Moulded uPVC door panels became available offering a wide selection of jelly-mould type copies of timber door styles. Woodgrain options were also introduced allowing people to ‘change the look of their home’. In reflection, this was not a good period for property style!

uPVC windows were huge by the 1990s and by the year 2000, most uPVC window manufacturers were offering internally glazed windows with higher security options and softer shaped frames. The gaskets around the glass were ill-fitting, large and black. White gaskets then hit the market and were greeted with much enthusiasm, however, they were soon withdrawn again when dirt and mildew built up and became visible. People switched their white gaskets back to black gaskets. External Georgian bars were now available for those that wanted a more realistic Georgian appearance. Although harder to clean than those with internal Georgian bars, we now had a uPVC window that started to resemble a more traditional timber window.

2010 saw a revolution in the glazing industry. There was a high demand for high quality, maintenance-free windows that performed like uPVC windows, but didn’t look like uPVC windows. Owners of high value homes didn’t want their windows to look like uPVC, they wanted them to look like timber but without the hassle and maintenance that is associated with timber windows.

uPVC profiles are now available in grained finishes and in several colours. Precision manufacturing created neater corners and mechanical joints, meaning that a uPVC window could now look just like a timber window. And so, the Timber-Alternative Window was born. These new, high quality windows enabled homeowners to have replacement uPVC windows without any compromise on style.

The last 10 years has seen a re-birth of the replacement window. Design is now the main motivation for replacing windows. You can choose flush or storm casements or traditional sliding sash windows and in almost any colour, from soft whites to trendy greens and contemporary greys and they can be installed in any property type; character cottage, Victorian terraced or contemporary new build.


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