When choosing double-glazed windows for residential buildings, the kind of frame to be used should not be ignored when choosing the glazing. It affects the beauty of your windows and determines their value, longevity, and how easy they are to upkeep. This blog will help you navigate the various frame materials available, so you can make an informed decision.

Speak with our trained professionals and learn about various material available for windows. Channel windows offer windows in uPVC, Aluminium, Sash, Casement and Tilt and Turn. Call us on 01304 379991 or email info@channelwindows.co.uk and we will get back to you as soon as possible.

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Types of Double-Glazing Frames

There are several materials for double-glazed frames, and each one has benefits and drawbacks. The major categories include uPVC, aluminium, timber, and composite doors. This means that understanding the characteristics of each material will play a vital role in enabling you to identify what window frames suit you best.

uPVC (Unplasticised Polyvinyl Chloride)

For double-glazing frames, uPVC is among the most widely used options. It is appreciated for its high density, non-decorative, ease of maintenance and fine thermal performance.


  • Cost-effective: uPVC is usually cheaper than other materials in terms of the cost of the products.
  • Low maintenance: It requires minimal upkeep; a simple wipe down is usually sufficient.
  • Energy efficiency: The use of uPVC frames is suitable because they have good levels of thermal efficiency, and therefore, energy bills can be lowered.
  • Weather-resistant: uPVC does not bend or get affected by rotting and is thus ideal for all kinds of weather.


  • Aesthetic limitations: Thermal efficiency: uPVC has numerous colours and finishes but can sometimes be less attractive than timber frames.
  • Environmental concerns: uPVC is non-biodegradable and has a considerably larger environmental load both during its manufacture and in the process of disposal.

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Aluminium frames are strong and durable and appeal to a modern minimalist aesthetic. These are especially used in modern business structures.


  • Strength and durability: Metal frames, particularly aluminium frames, are more rigid and can bear bigger glass sections and, as such, offer a wider view.
  • Slim profiles: This is because the strength of aluminium permits frames to be thinner than steel, allowing more glass exposure.
  • Low maintenance: It is a material that does not rust or corrode quickly and, thus, does not need frequent maintenance.
  • Recyclable: Aluminium has high recovery rates, making it suitable for the environment.


  • Thermal efficiency: Despite being malleable and ductile, aluminium is a conductor of heat, which may reduce the efficiency of energy. However, contemporary aluminium frames are still designed with a thermal break to enhance the insulation of the material.
  • Cost: Aluminium frames are often a little more costly than uPVC as well as timber.

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Besides, timber frames have attributes such as durability and flexibility, as well as an organic finish that makes any home appealing. They come in a variety of woods, with the choice usually being between hardwood and softwood.


  • Aesthetic appeal: Timber frames are probably the best when it comes to the issue of external appearance; they appear traditional and warm.
  • Insulation: Wood is also an insulating material and will, therefore, prevent the interior temperature from going very high or very low.
  • Sustainability: If timber is sourced sustainably, this is a renewable and more eco-friendly material than other materials.


  • Maintenance: Maintenance is also necessary from time to time to keep from rotting, warping and getting attacked by insects.
  • Cost: Timber frames as a type of frame maybe more costly than the other types of frames required in the building.
  • Susceptibility to weather: This clearly indicates that timber can also be subjected to weather conditions if not well treated.

Factors to Consider When Choosing Double-Glazing Frames

Energy Efficiency

The frame material determines how much heat will be transferred through the windows. At the same time, uPVC and composite door frames are considered the most thermally efficient, slightly less than timber and aluminium door frames with a thermal break.


To determine the types of window frames to choose, consider the amount of time and energy you are willing to spend cleaning and maintaining them. uPVC and aluminium do not need much attention in terms of maintenance, although the same cannot be said about timber frame doors, which are likely to rot if not regularly treated.


If you want your window frames to blend well with the architecture of your house. Timber windows are especially suitable for house-specific designs, while aluminium is more appropriate for modern homes. Aluminium and uPVC are flexible in terms of different types of conservatories.

Environmental Impact

Consider the environmental impact of your choice. Aluminium and timber (when sustainably sourced) are more eco-friendly options compared to uPVC. Composite frames can also be a good choice due to their long lifespan and energy efficiency.


The selection of frame material in double glazed windows depends on the aspect of the frame material and aesthetics of the frames, their efficiency in insulating heat, ease of cleaning, durability, and their effects to the environment.

Essentially, each material has its advantages and disadvantages, and the decision will depend on the individual preferences of a given lawyer. Now that we have described the different types of uPVC, aluminium, timber and composite frames you can now make the right choice and contribute to the aesthetics, comfort, and value addition of your home.

Some things worth considering included the need to find a good supplier who could offer good quality double glazing frames and professional services. Contact Channel windows for best quality. Call us on 01304 379991 or email info@channelwindows.co.uk and we will get back to you as soon as possible.