Wooden sash windows on terraced houses

When it comes to choosing wooden sash windows or uPVC windows for your period property, there are various things you need to consider.

1. Sash window design

Firstly, high quality wooden sash windows will replicate both the design and the material of your original sash windows, so if you would like your windows to stay true to the original character of the property, then wooden sash windows are the only option.

By choosing to maintain the original design and look of your property, you not only get a more elegant, authentic finish – you are contributing to maintaining the architectural heritage of your area.

Wooden sash windows offer much more flexibility of design than uPVC windows, which are bulkier and typically feature thicker double glazing. Wooden sash windows can be made with slimmer, elegant section sizes and thin glazing bars, as well as single glazing or slimline double glazing (which is able to match the insulation performance of regular double glazing). Wooden sash windows also offer a greater selection of colours, including ‘dual colour’ (a different colour on the interior to the exterior) and a wider choice of hardware.

uPVC sash windows are also only available with spring balances, rather than the original weights and pulleys that wooden sash windows typically feature. uPVC windows can be very heavy to lift, and they are often designed to open outwards rather than up and down.

2. Cost and longevity

There are several things to consider when comparing the cost of your wooden sash windows versus uPVC, and how long they will last. While uPVC windows can be the cheaper option in the short term, they have some cost disadvantages in the longer term.

Firstly, property prices are affected by the attractiveness of the exterior – particularly the front of a house – so the authentic, elegant look of wooden sash windows are a better investment to ensure you maximise the value of your property.

Secondly, uPVC windows won’t last as long as wooden windows that are properly maintained. uPVC is a porous substance that can fill up with pollution and discolour after 10 – 20 years. It is also liable to turn brittle and yellow in the sun. Unlike wooden sash windows that can be repainted and repaired, uPVC windows cannot be painted or part-replaced – so would need to be replaced in their entirety once they discolour.

At Timbawood we manufacture our sash windows using particularly strong and durable timber, such as Accoya, which won’t swell, twist or warp, even when damp – to maximise the longevity of our windows. We also use long lasting, microporous paint, which allows the timber to breathe and minimises the need for the windows to be repainted.

3. The environment

 When it comes to choosing environmentally friendly sash windows, it’s important to choose wooden sash windows that are made from sustainable sources.

uPVC is derived from oil, which as an unsustainable, reducing source, is harmful to the environment. uPVC is also difficult to recycle, and usually ends up in landfill where it takes at least 100 years to decompose.

At Timbawood we choose timber from sustainable sources, such as Accoya, which is environmentally friendly at every stage of the process, from the renewable, managed forests it’s sourced from to the manufacturing process and finally it’s ability to be recycled.


If you are interested in authentic, traditional wooden sash windows for your period or modern property, please call us on 0208 893 4889 to speak to one of our experts or arrange a free survey or quotation.