An overview of aluminium and uPVC windows
Before diving into the details, it helps to understand what each material is best known for. Both are widely found in UK homes, popular and used for different reasons.
uPVC windows are valued for their practicality and all-round performance. They are widely used across the UK due to their affordability, insulating qualities, strength and durability, robust security features, and low-maintenance design. With a wide choice of styles and finishes, uPVC windows suit both traditional and modern properties.
Aluminium windows are recognised for their slim frames and clean, modern appearance. Their strength means they can support more glass with smaller frames, making them a popular choice for contemporary homes, extensions, and design-led projects where maximising light is important.
Which is better for windows, uPVC or aluminium?
For many UK homes, uPVC windows offer the best all-round balance of performance, cost, and practicality. Aluminium windows, meanwhile, tend to appeal to homeowners looking for a specific modern aesthetic or architectural feature.
To properly understand their pros and cons, here’s how uPVC and aluminium windows compare across key criteria for homeowners:
Advantages and disadvantages of uPVC and Aluminium windows
uPVC
Advantages
- Excellent energy efficiency
- Strong security features
- Cost-effective
- Low maintenance
- Wide range of styles and finishes
- More adaptable with configuration
Disadvantages
- Thicker frames than aluminium
- Less colour options than aluminium
Aluminium
Advantages
- Slim, modern profiles
- Contemporary aesthetic
- Strong and lightweight material
- Low maintenance
Disadvantages
- Higher cost
- Lower insulation than uPVC
- Less suitable for traditional homes or heritage properties
Energy efficiency
uPVC
uPVC frames are made to be insulating, with multiple chambers that help slow cold or heat passing through. This makes them effective at retaining heat within the home and slowing cold and heat getting from one side of the frame to the other. Benefits include
- Reduced heat loss through window frames
- Lower heating bills
- More consistent indoor temperatures
When combined with modern double glazing, uPVC windows help keep homes warmer in winter and cooler in summer.
Aluminium
Aluminium is a strong and lightweight material, but it conducts heat more readily than uPVC. Modern aluminium windows address this through the use of thermal breaks, which help to improve insulation. Benefits include:
- Double glazing lowers heat loss through glass vs single glazing or older double glazing
- Thermal breaks lower thermal transference through the frame
Takeaway: Both frames easily meet modern standards with double glazing, but uPVC generally offers higher thermal efficiency as standard, particularly for homes where energy savings are a priority. uPVC can also have triple glazing installed by the majority of manufacturers, and while Aluminium can be triple glazed very few manufacturers offer this.
Security
uPVC
Modern uPVC windows are designed with security as a key consideration. Features typically include:
- Multichambered frames
- Multi-point locking systems
- Key locking handles
- Safestyle uPVC casement windows have internal beading (so glass can’t be removed externally)
- Safestyle uPVC casement windows have a built-in excluder that engages if someone tries to force the window from the outside
Aluminium
Aluminium is a robust material, and aluminium window systems can also provide strong security when paired with high-quality locking mechanisms. Features typically include;
- Very strong frames
- Multipoint locking
- Key locking handles
- Internal beading
- Anti-jemmy design
Takeaway: Both materials can offer excellent home security.
Appearance and kerb appeal
uPVC
uPVC windows have evolved significantly and now offer far more choice in colour and style than many homeowners expect.
Modern uPVC designs include:
- A wide range of colours and finishes
- Woodgrain effects for traditional homes
- Styles suitable for both modern and period properties
This flexibility allows uPVC windows to enhance kerb appeal across a broad range of home styles.
Aluminium
Aluminium windows are often selected for:
- Contemporary homes
- Large glazed openings
- Modern extensions
Their slim profiles can create a striking, architectural look. However, they may not always be the best aesthetic match for traditional or period properties.
Takeaway: uPVC windows offer greater versatility across different property styles, while aluminium suits more design-led projects.
Maintenance and longevity
uPVC
uPVC windows are known for being extremely low maintenance, retaining their appearance and performance for many years with minimal effort.
They typically require:
- No painting or sealing
- Simple cleaning with soapy water
- Occasionally cleaning and oiling moving parts
- Minimal upkeep over their lifespan
Aluminium
Aluminium windows are very durable, weather-resistant and low-maintenance. Depending on quality, modern aluminium frames usually have long-lasting powder-coated finishes that require very little care.
They typically require:
- No painting or sealing
- Simple cleaning with soapy water
- Occasional cleaning and oiling of moving parts
Takeaway: uPVC windows and aluminium windows are generally pretty low maintenance over time, and cost less to maintain than timber. However, in the event of damage, it is likely going to be more expensive to fix or replace an aluminium window than a uPVC one.
Cost
uPVC
uPVC windows are widely regarded as the most cost-effective window option in the UK. Benefits include:
- Lower upfront cost
- Excellent value for money
- Minimal ongoing maintenance costs
This makes uPVC a practical choice for full-home window replacements as well as smaller upgrades.
Aluminium
Aluminium windows sit at a higher price point and are often considered a premium option. The increased cost reflects the material itself, manufacturing processes, and the type of projects aluminium is typically used for. Benefits include:
- Designer look
- Added value to your home
- Stronger, slimmer frames for more light
For homeowners prioritising design over budget, aluminium can be a suitable investment. However, for most households, uPVC offers stronger overall value.
Takeaway: uPVC windows are generally the more affordable choice, both initially and over the long term. However, the right window for the right price can be a fantastic long term investment for your property.
Final verdict: which is right for my home?
Upgrading your windows, regardless of material, is a great investment, particularly when you’re replacing old single or double glazed windows. Both have advantages for different properties too, and both are suited for different jobs. For all the important things like security, energy efficiency and overall look, both materials deliver reliable performance and longevity.
uPVC windows are the perfect choice in the following situations:
- Prioritising Energy Efficiency: uPVC frames are often more easily paired with triple glazing, achieving better energy efficiency than aluminium. Not many companies offer aluminium triple glazing, and when they do the costs are usually prohibitive.
- Older properties: uPVC is so versatile that it can be made to resemble original windows like Sash, and even have woodgrain finishes to resemble timber. They are the best choice over aluminium when you want windows to look more in-keeping with original features.
- Customisation: uPVC windows are available in more styles like Sash so they give you more options for customisation.
- Affordability: uPVC windows are the most affordable windows.
Aluminium windows are the best choice in the following situations:
- Design-led project: If you’re planning a modern, stylish upgrade for your home, aluminium windows are the best looking option around. Match them to your aluminium bifold doors or create a fantastic feature window on your extension.
- Maximise light: The stronger frames of aluminium means they can hold more glass, so they can be slimmer. This allows in more light than other window frame materials and gives you better sightlines too.
Why choose uPVC windows from SafeStyle?
At SafeStyle, we offer high quality uPVC windows in multiple styles including Casement, Sash, Tilt & Turn and Bay windows. Our uPVC windows are made in the UK and carry a host of accreditations and lengthy guarantees.
What you can expect from Safestyle uPVC windows:
- Energy efficiency: strong u-values and energy efficiency ratings as standard.
- Robust security: plenty of features across our range that keep your home safe and secure.
- Plenty of customisation: a huge range of colours, glazing options, configurations and finishing touches to choose from.
- Excellent customer service: from free quote to your expert surveyor and then professional installation from our experienced team, we look after everything.
- Outstanding value for money: with financing options available to suit your needs.
Explore our full range of uPVC windows and discover why they’re the preferred choice for homeowners across the UK.