What Is A Composite Door

Composite doors have grown in popularity in the last few years and are now the most popular option for fronts doors in the UK, however, what exactly is a composite door and what makes it different to other doors options available on the market?

In this article, we’ll explore what is a composite door is, the features and benefits of composite doors, and what the difference is between composite doors and other types of doors.

What Is a Composite Door Made Of?

A composite door is made up of various components that work together to create a strong and durable structure. The main materials used in a composite door are timber, glass-reinforced plastic (GRP), and UPVC. Timber is commonly used as the core material, providing strength and stability. GRP, a type of reinforced plastic, is then applied to the surface to add strength and resistance to weathering. The insulating layers of timber are inserted in between the layers to enhance energy efficiency and improve thermal performance. These materials are carefully combined to create a composite door that offers the perfect blend of strength, security, and insulation for your home.

Components of  composite door
  1. The outer surface of a composite door consists of a 2mm thick layer of Glass Reinforced Plastic (GRP), commonly known as fibreglass. This material, also utilized in the construction of fishing boats in the North Sea, possesses remarkable toughness, weather resistance, and the ability to accurately mimic the texture of wood grain. As a result, it enhances the door’s visual appeal, making it an attractive addition to any home.

  2. The durable GRP panels with a sturdy exterior are securely combined with an internal uPVC frame, and further complemented by an additional layer of hardwood, resulting in a double frame that offers exceptional stability and rigidity.

  3. The interior of the door is filled with a timber core, consisting of multiple layers of pressed timber that provide superior security and insulation properties, thereby enhancing the energy efficiency of your door.

  4. Composite doors are highly secure, thanks to the robust outer door frame made from a combination of durable 70mm uPVC and reinforced with steel. This sturdy construction ensures that composite doors offer utmost security and peace of mind.

Composite Doors Benefits

  • Long-lasting investment: Composite doors do not require frequent replacement like timber or uPVC doors, with a lifespan of up to 20+ years.

  • Durability: Stronger than timber and uPVC, composite doors can withstand wear and tear, bumps, and knocks. The external GRP material is highly resistant to dents, kicks, and knocks.

  • Enhanced security: Composite doors offer superior security with a steel-reinforced frame and internal solidity, making it difficult for burglars to break through.

  • Thermally efficient: Composite doors eliminate draughts and gaps, ensuring excellent insulation. They are A-rated for thermal efficiency, helping to retain heat in the home.

  • Attractive appearance: With a wood-grain effect surface, composite doors resemble painted timber doors, adding curb appeal and value to the property.

  • Low maintenance: Unlike timber, composite doors do not require constant care to prevent cracking, rotting, or peeling. They can be easily cleaned with a cloth to maintain their appearance and longevity.

How Much Does A Composite Door Cost?

Composite doors come in a range of prices depending on factors such as style, color, hardware, security extras, and size. The cost of a composite door can vary based on your preferences and requirements. If you prefer a more intricate design or a specific color, it may affect the price. Similarly, the type of hardware and security features you choose can also impact the overall cost. Additionally, the size of the door plays a role in determining the price.

It’s important to consider these factors when budgeting for a composite door, as they can affect the final cost. However, investing in a composite door is worth considering due to its durability, energy efficiency, and aesthetic appeal.

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Composite Doors vs UPVC Doors

When it comes to choosing between composite doors and UPVC doors, consider the benefits of each option and weigh them against your specific needs.

Composite doors are made of multiple materials, including a sturdy timber core surrounded by additional layers of materials like uPVC and GRP. They offer a classic timber appearance with modern performance, require minimal maintenance, and have enhanced security with multi-point locking mechanisms.

On the other hand, UPVC doors are more economical and lower maintenance, but they lack the durability and strength of composite doors.

Composite doors are a better investment for longevity and offer superior security and weatherproof seals.

Ultimately, the decision between composite and UPVC doors depends on your priorities for longevity, security, and aesthetics.

Problems with composite doors

Are there any common issues that arise with composite doors?

Composite doors are known for their durability and low maintenance, but like any other product, they may have some common issues.

One potential problem is swelling in hot weather, especially for south-facing doors. However, this can be easily remedied by adjusting the door.

Another consideration is the initial higher cost compared to uPVC doors. However, composite doors are a better value investment in the long run due to their longevity and durability.

It’s important to note that painting a composite door isn’t recommended as the surface doesn’t adhere well to paint.

Overall, composite doors have few problems compared to other door types and offer exceptional benefits such as superior strength, energy efficiency, and an attractive appearance.

Do composite doors fade?

You don’t have to worry about your composite door fading over time. Composite doors are designed to maintain their color and appearance for years to come.

Unlike traditional wooden doors that can fade and lose their vibrancy, composite doors are made with materials that are resistant to fading. The combination of a sturdy timber core, uPVC layers, and a GRP coating ensures that your composite door will stay looking as good as new.

The uPVC layers provide weatherproof protection, preventing warping or fading due to harsh weather conditions. So, whether your composite door is exposed to sunlight or extreme temperatures, you can trust that it will retain its beautiful appearance.

How long do composite doors last?

Composite doors can last for 20+ years, providing you with long-lasting durability and security. Imagine having a front door that withstands the test of time, keeping your home safe and secure.

Picture a door that remains sturdy and robust, unaffected by warping or fading, thanks to its weatherproof layers.

Visualize the peace of mind that comes with a multi-point locking mechanism, offering enhanced security against intruders.

Composite doors not only offer longevity but also provide excellent insulation, reducing energy consumption and saving you money on bills.

With their classic timber appearance and modern performance, composite doors combine the best of both worlds.


In summary, a composite door is a durable and versatile option, offering long-lasting performance and enhancing the security of your home.

Made from a combination of materials, including a sturdy timber core, composite doors are designed to be strong and robust. With additional layers of uPVC, laminate, or GRP surrounding the timber core, these doors are weatherproof and resistant to warping or fading.

The multi-point locking mechanisms provide enhanced security, while the solid timber core and durable layers make the door impact-resistant.

Not only do composite doors offer excellent insulation, reducing energy consumption and saving money on bills, but they also require minimal maintenance and don’t need regular cleaning or repainting.

Overall, composite doors are an attractive and reliable choice for your home.



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Astframe is a uPVC Windows & Doors manufactured based in Norwich.

We supply a range of premium quality products including uPVC Windows, Doors, and Conservatories. Aluminium Bi-Folding Doors, Patio Doors.

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