Window Frames – Aluminium vs uPVC vs Timber

Do you know which window frames are more energy-efficient? Do you know the price comparisons of different materials?

Planning the new window frames for your home requires careful consideration of both aesthetic and practical requirements. In this article, we compare the most common types of window frames in New Zealand, including timber, aluminium, and uPVC. 

Window frame materials

When choosing window frames for your home, the window frame material is the best place to start. In New Zealand, the most common options are wood, uPVC, and aluminium. 

• Aluminium Windows — Aluminium is known for its durability, low maintenance, and corrosion resistance. It’s also 100% recyclable, resistant to UV, and lightweight.
• uPVC Windows — uPVC is a hard plastic material known for its low maintenance, thermal insulation and innovative openings. However, it is more expensive than aluminium.
• Timber Windows — Wood is easy to work with, versatile, and renewable. However, it does require regular maintenance and is more expensive than aluminium or uPVC windows. 
  
  

Aluminium vs uPVC vs Timber — which is better? 

In this section, we compare the key characteristics of all three frame materials so you can see the pros and cons of each. Depending on your priorities, this will help you decide which is the best choice for your project. 

Energy efficiency 

uPVC is an excellent insulating material, supporting the home’s energy efficiency and reducing the risk of condensation on your window frames. Similarly, timber is naturally insulating but is also more prone to shrinking, warping and deteriorating over time, especially when not maintained properly, potentially leading to drafts. 

On its own, aluminium is not a good insulator but most aluminium window frames now include a thermal break. This is an insulated barrier of reinforced polyamide sandwiched between the aluminium, stopping the heat transfer. Paired with double glazing and Low-E, this keeps your home at a comfortable temperature and minimises your energy bill. 

Durability

If cared for correctly and consistently, timber windows can last for decades. However, there is a higher risk of irreversible damage from exposure to the elements, such as warping and rotting.

uPVC is relatively durable but is susceptible to discolouration and staining when exposed to harsh UV rays or pollution. Unfortunately, it is very difficult to restore.

On the other hand, aluminium is incredibly strong, durable, and corrosion-resistant, making it the top choice for security and longevity.

Maintenance

Aluminium and uPVC windows require very little maintenance, only needing a wipe-down with a cloth to remove any build-up. Unlike timber, there’s no need to re-apply finishes because the colour and finish are made to last. 

Timber windows require a lot more maintenance, including treating, staining, painting, and sealing. As timber is not weatherproof, it needs constant care to prevent expansion, warping, rotting, fading, mildew, and mould. The hardware will also need to be lubricated and cleaned with specialist products.

Sustainability

Aluminium is one of the most sustainable window materials because it is endlessly recyclable and requires far less energy to be produced from raw materials. 

Timber is also considered sustainable when sourced from renewable and responsibly managed forests. However, it does require more frequent replacement which can put strain on the supply chain. 

While uPVC is the most energy-efficient choice, it is produced with harmful chemicals and is not biodegradable. This means it will persist in landfills for an extended period and may release environmentally harmful toxins in the process. 

Cost

Unfortunately, it is difficult to provide a clear cost for different window frame materials because it is so dependent on the project. Generally, timber frames are the most expensive, both to install and maintain.  

uPVC windows are the next in price but do not require as much maintenance. In most cases, they only need a quick wipe-down every few months to keep them looking their best. 

Aluminium windows are far more cost-effective and only require occasional cleaning with a cloth. Note that all aluminium windows must now contain a thermal break which will also amount to significant energy savings over time. For reference, our aluminium windows start from approximately $530 per square metre. 

Aesthetics

Timber window frames provide a traditional and warm appearance, with more character and texture in the finish. You can choose to paint or stain them but the upkeep is more demanding, meaning the visual appeal can deteriorate much faster. 

uPVC comes in fewer finishes and colours and is prone to discolouration over time. It’s also not as strong as aluminium, making it difficult to achieve the slimline look. 

Aluminium has a more sleek and refined finish because its strength enables a slimline frame. You can also opt for various colours and textures, including satin, metallic, matt, gloss, or even a woodgrain imitation like our Eurowood powder coat finish. The finish of aluminium will also last much longer. 

DuCo Aluminium Windows NZ

In New Zealand, many buildings need new windows to improve energy efficiency, internal comfort, and functionality.

In a nutshell, we’re all about creating spaces you love to be in. Our team is passionate about windows and doors because we know how impactful they are for light, warmth, and the outlook of a room. 

From our Cambridge workshop, we design, manufacture and install premium quality joinery and accessories for projects throughout the North Island. That means we can support you throughout the project, whether you need replacements or brand-new windows. 

We’re here to make it easy, which is why our promise remains the same - from start to finish and beyond, we’re with you the whole way through. Request a quote today or contact us to find out more and discuss your next steps.