uPVC windows were popularised in the 1970s onward, beloved for it’s low maintenance, respectable energy efficiency and, most of all, high affordability due to low manufacturing costs. That being said, timber windows are, and likely always will be, a classic choice not just to their sophisticated aesthetic appeal, but also their superior thermal efficiency.

But is it worth the extra cost? In this article, Double Glazing On The Web will explore in more detail the pros of each window, and whether or not you should make the change.

Performance Breakdown of uPVC vs timber windows

The following will break down the performance of each window frame material assessing them by 5 key points:

1. Aesthetic appeal

The first thing you notice about windows is how they look, and one of the factors that impacts on property value is ensuring your windows complement your home and look the part.

uPVC windows frames:

  • Factory finished colours – White, grey and woodgrain effects are the main colours available, but uPVC is not a window that can be painted.

Timber window frames:

  • Repaintable – You can paint or stain wooden windows to change or maintain new looks.
  • Detailing – Intricate carvings and mouldings are available on higher end units.

Timber windows are best suited to period properties, listed buildings, and heritage homes due to their authentic and traditional appearance. In contrast, uPVC is best suited for modern or new builds. Even so, most people would consider timber windows to look better than limited and basic uPVC frames.

That being said, there are more modern timber variants, named engineered timber windows. These wooden frames could look good with a modern home due to its more sleek and minimalist design.

2. Energy Efficiency

Energy efficiency refers to insulation and how much heat is used before being lost in a home. Increasing energy efficiency means lowering energy bills in the long run, so this should be considered when making a choice.

uPVC window frames:

  • Good efficiency – uPVC windows are a solid choice when paired with double-glazing and other energy efficiency measures, as they have a low thermal conductivity of 0.19 W/m.k.

Timber window frames:

  • Great efficiency – Timber frames are made of naturally insulating material, and offer higher levels of insulation compared to uPVC, and how much depends on the quality of the build. On average, timber frames have around 0.13 W/m.k.

When judging energy efficiency between uPVC vs timber windows, timber blocks 30 – 40% more heat loss than uPVC.

3. Maintenance and long term costs

This category is a little more complicated, as it not only factors in costs associated with maintenance, but also with how much money is retained just by having the windows.

uPVC window frames:

  • Longevity – uPVC frames last 25-35 years. Lower quality uPVC can begin to fade before then, around 20 years in.
  • Low maintenance – There is no need to do anything beyond cleaning your windows with a light soap, due to its impressive hardy material.
  • Heat vulnerable – In seasons of extreme temperature, uPVC windows can be warped.
  • Cheaper upfront – uPVC windows save money in the immediate future by having a much lower upfront cost than timber, between £750 – £1,000 on average.

Timber window frames:

  • Maintenance – Wooden window frames require repainting or resealing every 5-10 years, not to protect the aesthetic, but to protect against moisture damage.
  • Longevity – Timber windows last for 60+ years, potentially twice as long or more than uPVC.
  • Long term investment – Timber windows typically cost 50% more than uPVC windows, around £1,200 – £1,600 per window. That being said, it’s also known to add to the value of period properties – between 10 – 15%.
  • Air quality – Timber is breathable, helping regulate indoor air quality by managing humidity and reducing damp and mould risks.

4. Environmental credentials

For those who have a mind for environmental and ecological health, consider the following.

UPVC window frames:

  • Recyclable – uPVC windows are 30-40% recyclable, with the rest of it ending up in landfills.
  • Production – Production of uPVC windows released around 6kg of CO2 per kg of material.

Timber window frames:

  • Production – The production of timber windows produces less than 80% of the CO2 that uPVC does.
  • Carbon emissions – Timber, sourced sustainably, can be either carbon neutral or carbon negative, absorbing 1.8 kg of CO2 per kg of material over its lifetime.
  • Recyclable – Timber can be recycled, or fully and naturally biodegraded.
  • Conservation areas – Timber is suitable for conservation areas, and listed buildings.
  • Ethical – Timber windows can be ethically and sustainably sourced from FSC and PEFC managed forests, with harvested trees being reforested. Advancements in engineered timber also improves longevity and reduces need for chemical interference.

5. Value for money

What you get for your money is always more important than what you spend. Value for money is efficiency.

When looking at the value when comparing timber vs uPVC windows, consider the following:

  • Upfront and lifetime costs – uPVC windows are cheaper at £750 to £1,000 per window, whereas timber windows are £1,200 to £1,600 per window (around 50 to 60% more). But uPVC lasts 25 – 35 years before needing replacement, whereas timber windows last 60+ years. How long you’re staying in your home should be a deciding factor in your choice.
  • Heating bills – The standard double-glazed uPVC windows will save £125 – £235, whereas timber windows save £131 – £270 per year. Lifetime savings of uPVC windows are between £2,500 – £8,225 for their life cycle of 20 to 35 years, and for timber windows they are £3,930 – £16,200 for their 60 years.

Conclusion

The uPVC vs timber windows debate can be finalised by the following verdict: the better window depends on how long-term it is, and what style of home you have. Timber windows’ timeless look both complements periodic homes, and is a long-term investment. For homeowners that have modern looking homes, uPVC windows typically look better, unless you want to invest in modern timber (engineered timber windows).

Your windows are not an expenditure, but rather an asset and investment.

FAQs

Is modern timber better than traditional timber windows?

Yes. Generally, engineered timber windows offer more than their traditional variants:

  • Construction – Engineered timber uses laminated or modified wood that boast high resistance to warping, swelling or cracking.
  • Weather resistance – Factory-applied microporous coatings that prevent moisture damage and rot.
  • Longer lifespan – Engineered timber windows and durable finishes can push past traditional windows’ 60 years up to 100.
  • Low maintenance – Wood windows typically always need semi-consistent proper maintenance, but engineered wood windows are far less prone to rot and weathering issues.
  • Sustainable – Most engineered wooden windows use certified wood sourced from eco-friendly afforestation efforts.

Is a complete replacement necessary, or can I restore my wooden windows?

This depends entirely on the condition of your existing wooden windows. Have a qualified surveyor assess your windows for confirmation.

However, in cases where restoration is possible, understand that it’s much better to do so due to the lowered costs.

Typically, restoration is possible when:

  • Minor rot or damage – Small areas of rot can be cut out and repaired with wood filler or epoxy.
  • Loose/sticking sashes – Adjusting hardware, sanding or lubrications usually serve as fixes.
  • Flaking or peeling paint – A fresh coat of microporous paint can extend the lifespan of wooden frames.

What is the better choice for new builds?

New builds typically are built with modern aesthetics, and uPVC windows (especially higher quality variants) tend to be more in line with the style. It’s not a good idea to have mismatched materials for your windows and doors.

If you want new windows for your build that are wood, then your only recourse is to commit to engineered wood, and take advantage of the sleek style. However, this means giving up the sophisticated aesthetic that wooden windows are loved for.