Which Is the Right Choice for Your Home: uPVC Windows or Timber Windows?

Yes, uPVC windows are generally more affordable than timber windows. A standard uPVC casement window costs between £400 and £600 installed, while an equivalent timber window typically ranges from £800 to £1,200. However, timber windows can add more value to a property, particularly period homes, and may offer a better return on investment when selling. Over a 30-year period, the total cost of ownership for uPVC can still be lower due to minimal maintenance requirements, whereas timber needs regular repainting and sealing.

Both uPVC and timber windows offer excellent energy efficiency when fitted with modern double or triple glazing. Timber is a natural insulator with slightly better thermal performance than uPVC in like-for-like comparisons. However, modern multi-chambered uPVC profiles have closed the gap considerably and can achieve A+ energy ratings. The overall energy performance depends more on the glazing type, installation quality, and seal integrity than the frame material alone. Both options comfortably meet current UK Building Regulations for thermal performance.

With proper maintenance, timber windows can last significantly longer than uPVC. Well-maintained hardwood timber windows can last 50 to 60 years or more, while softwood timber frames typically last 30 to 40 years. uPVC windows have an average lifespan of 20 to 25 years before they may need replacing. However, timber requires regular upkeep including repainting or re-staining every 3 to 5 years and periodic checks for rot or insect damage, which adds to the long-term cost and effort.

Timber windows are often the preferred or required choice for properties in conservation areas and for listed buildings in the UK. Local planning authorities typically require that replacement windows match the original materials and style to preserve the character of the area. uPVC windows are frequently rejected in conservation areas due to their modern appearance. If you live in a conservation area, consult your local council's planning department before ordering replacement windows to understand the specific requirements that apply to your property.

Timber windows typically need repainting or re-staining every 3 to 5 years to maintain their protective finish and prevent moisture damage. The frequency depends on the type of timber, the quality of the paint or stain used, and the window's exposure to weather. South-facing windows may need attention more frequently due to greater UV exposure. Using high-quality microporous paints can extend the interval between repainting. Regular inspection for early signs of flaking or cracking allows you to address issues before they lead to rot.

Modern uPVC windows have improved significantly in terms of design and can now closely replicate the appearance of traditional timber windows. Options such as woodgrain foil finishes, authentic-looking astragal bars, and mechanical joints help uPVC windows blend with period property aesthetics. However, for listed buildings or properties in conservation areas, uPVC may not be accepted by the local planning authority. For non-listed period homes outside conservation areas, uPVC can be a practical and cost-effective alternative to timber.

Timber windows are generally considered more environmentally friendly than uPVC. Timber is a natural, renewable resource with a lower carbon footprint during manufacture, and it is biodegradable at the end of its life. FSC or PEFC certified timber ensures responsible forestry practices. uPVC is a petroleum-based plastic that requires more energy to produce, though it can be recycled up to 10 times. Both materials contribute to energy savings through improved insulation, but timber has the edge in overall environmental impact across its full lifecycle.