Composite Doors UK: What to Look For (and Why We Install Palladio)

A composite door is one of the most impactful upgrades you can make to a property. It improves security, thermal performance and kerb appeal in a single installation. But with dozens of brands and hundreds of styles available, choosing the right one can feel overwhelming. In this guide we cut through the noise and focus on what actually matters when selecting a composite door in 2026.

What to Look For

Not all composite doors are created equal. The three things that separate a premium door from a budget one are the core material, the security certification and the warranty. A quality composite door should have a solid timber or insulating core — not just expanded foam. It should be independently tested and certified to PAS 24 or Secured by Design standards. And it should come with a minimum 10-year manufacturer's warranty that covers both structural integrity and colour stability.

The outer skin material matters too. GRP (glass-reinforced plastic) is the most common, but fibreglass monocoque construction — as used by Palladio — is a step above. It's more rigid, more resistant to UV degradation, and holds a realistic woodgrain texture that doesn't fade or chalk over time.

Palladio Composite Doors

Palladio is our top recommendation and the door we install most frequently. Manufactured in Ireland, Palladio doors use a unique monocoque fibreglass construction that makes them exceptionally strong and weather-resistant. Every door comes with triple-glazed glass as standard, a multi-point locking system, and a 12-year structural warranty.

The design range is extensive, covering everything from traditional panelled styles to bold contemporary designs with full-height glass. Colours are moulded into the fibreglass rather than painted on, which means they won't peel, flake or fade. Palladio doors consistently outperform competitors in independent security, weather and durability testing.

Why We Install Palladio Exclusively

At Vitrum Solutions we only install Palladio composite doors. After testing and installing multiple composite door brands over the years, Palladio consistently outperforms the competition on security, thermal performance and long-term durability. The monocoque fibreglass construction is fundamentally different to GRP-skinned doors with timber cores — it is a single moulded shell with no weak points, no joints to separate, and no timber to absorb moisture.

We chose Palladio because we want every door we install to perform flawlessly for decades. The 12-year manufacturer warranty and triple-glazed glass as standard give our customers genuine peace of mind. Every Palladio installation is FENSA registered and protected by a 10-year CPA insurance-backed guarantee.

Tiers in the 2026 UK Market

The UK composite door market splits into three tiers. Entry-level doors use a GRP shell over a foam core with double-glazed inserts and basic multi-point locking. Mid-range doors use a solid timber core with PAS 24 security and a wider colour palette. Premium doors (the tier Palladio sits in) use monocoque fibreglass construction with triple-glazed glass as standard, 12-year structural warranty and the slimmest sightlines available in the category. Final cost on any tier depends on door style, glass options, hardware, sidelights and any structural alterations needed.

Questions to Ask Your Installer

Before committing to a composite door, ask your installer these key questions: What is the core material? Is the door PAS 24 or Secured by Design certified? What warranty is offered and what does it cover? What is included in the installation price — frame, cill, threshold, handles, letterbox? Will they remove and dispose of the old door? A reputable installer will answer all of these clearly and without hesitation.

Frequently Asked Questions

What is the best composite door brand in the UK?

Palladio is widely regarded as the best composite door brand in the UK. Their doors feature a monocoque fibreglass construction, triple-glazed glass units and consistently top independent security tests. At Vitrum Solutions we exclusively install Palladio because no other composite door matches their build quality and long-term performance.

Which composite door brand lasts longest?

A quality composite door should last 30-35 years as a minimum. Premium brands like Palladio can last even longer thanks to their solid construction and UV-stable fibreglass skin. Cheaper composite doors with a foam core may start to show wear after 15-20 years.

Are composite doors more secure than uPVC?

Yes, significantly. Composite doors have a solid core (timber, insulating foam or a combination) that makes them far more resistant to forced entry than hollow uPVC door panels. Most quality composite doors are PAS 24 or Secured by Design certified as standard.

How much does a composite door cost fitted?

Final composite door cost depends on the tier (entry-level GRP versus monocoque fibreglass), door style, glass options, hardware, sidelights and any structural alterations to the existing opening. Vitrum Solutions provides a free no-obligation survey at your property: our surveyor measures up, discusses your specification and provides an honest itemised quote the same day. Every Vitrum installation is FENSA registered with our 10-year CPA insurance-backed guarantee.