For instance, if you live somewhere with harsh winters, uPVC might be a better choice due to its superior insulating properties. On the other hand, if you’re going for something that fits more with the character of a period property, timber could be worth the extra effort.

Great question! I’ve gone through a similar process, and it really comes down to what you’re prioritizing. Here’s my take:

-uPVC is the most affordable option and has excellent insulation properties. It’s low-maintenance, so it’s great if you don’t want to spend time on upkeep. However, it can sometimes lack the aesthetic appeal of wood or aluminum, especially if you're going for a more traditional look.

-Aluminum is sleek and modern, offering durability and strength, but it doesn’t provide the same level of insulation as uPVC or timber. It’s a good option if you live in a milder climate or prefer a more industrial look. Plus, you can get thermal breaks in the frames to improve efficiency.

-Timber is definitely the most attractive if you’re after a natural, classic aesthetic. It offers good insulation and can be treated for durability, but it requires more maintenance over time. It’s a fantastic choice if you’re willing to put in a little extra work to preserve its beauty.

I’d recommend checking out double glazing for more detailed comparisons and how these materials stand up to weather conditions and long-term use. They give a great overview on how each material performs in terms of double glazing efficiency.