Palladio vs Solidor Composite Doors: 2026 Comparison

Palladio and Solidor are the two most widely specified composite door brands in the UK premium market. Both carry Secured by Design accreditation and both quote 12-year manufacturer warranties. On the surface they look comparable. In practice there are meaningful differences that push different homeowners toward one or the other. The biggest is the fundamental construction (Palladio is a one-piece 65mm GRP fibreglass monocoque slab; Solidor is a 48mm solid timber core with bonded GRP skins); colour longevity, warranty coverage and installer support diverge from there.

This guide walks through both brands head-to-head and explains which is the right choice for different property types and priorities.

Quick Decision Frame

Choose Palladio if you want the longest colour-stability warranty in the UK composite door category (12 years on a UV-stable fibreglass surface), the strongest construction tier (a 65mm GRP fibreglass monocoque slab with no bonded skin joins that can delaminate at end of life), the better U-value (0.85 W/m²K solid), or coastal/exposed-location service where colour fade is the biggest risk.

Choose Solidor if you want the widest published design and colour catalogue in the UK market (24+ standard colours, 30+ door styles, 40+ glass patterns), need a fire-rated FD30 configuration, want Yale Keyless Connected smart-lock integration as a factory option, or prefer the broader dealer network so any competent composite installer can fit your door.

Either works for UK PAS 24:2022 security certification, Secured by Design accreditation, 3-star TS007 anti-snap cylinders, 5-point hook-bolt locking and laminated inner glass. Both manufacturers offer multi-decade service life on the premium spec.

Why this post leans Palladio

Vitrum Solutions installs Palladio exclusively across our service area (Buckinghamshire, Berkshire, Oxfordshire, Surrey, Hampshire, Hertfordshire, West London). Solidor is included below as comparison context for homeowners weighing a Solidor proposition from a different installer; it is not a brand we fit. The technical breakdown is provided so the call can be made on the spec, not the sales pitch.

Construction Differences

Palladio: Monocoque Fibreglass

Palladio doors are built as a single 65mm GRP fibreglass monocoque slab: one continuous moulded shell with no timber core inside and no separate skins bonded to a frame. Think of it like a one-piece car door panel: no weak points, no joins where moisture can ingress, no skin-to-core delamination pathway.

Key construction features: - 65mm GRP fibreglass monocoque slab (no internal timber core, no bonded skins) - One-piece moulded shell: both faces and all four edges in one continuous unit - Triple-glazed glass units as standard - U-value: 0.85 W/m²K solid / 0.98 W/m²K glazed (among the best-insulated composite doors available) - Irish manufacture (Limerick) with tight QA process

Solidor: Bonded GRP Skin

Solidor uses a traditional composite door construction: - 48mm solid timber core - Glass-reinforced polymer (GRP) outer skins bonded to the timber core on front and back - Separate edge strips around the perimeter - Triple or double glazing options - U-value: 1.2 W/m²K - Stoke-on-Trent manufacture with established production scale

The difference matters because bonded skins can (in rare cases) delaminate at the edges over 20+ year lifespans, particularly in wet exposed positions. Palladio's monocoque construction eliminates this failure mode entirely.

Result: Palladio for monocoque construction with no skin-to-core delamination pathway. Solidor for traditional bonded-skin construction with a longer UK manufacturing history and broader installer network.

Security Comparison

Both doors are Secured by Design accredited and PAS 24:2022 certified. Standard specifications are very similar:

Palladio

• 3-star TS007 cylinder (anti-snap, anti-drill, anti-bump)
• Multi-point hook-bolt locking (5 points)
• Laminated inner glass pane
• Reinforced hinge jamb
• Integrated peephole and security chain optional
• PAS 24:2022 certified

Solidor

• 3-star TS007 cylinder (anti-snap, anti-drill, anti-bump)
• Multi-point hook-bolt locking (5 points, Yale lock standard)
• Laminated inner glass pane
• Reinforced hinge side
• Integrated smart lock options (Yale Keyless Connected) available
• PAS 24:2022 certified
• Optional fire rating (FD30)

Result: Equal on the headline security certifications (PAS 24:2022, Secured by Design, 3-star TS007 cylinders, multi-point hook-bolt locking). Palladio's monocoque shell has no bonded edges to attack at the perimeter. Solidor for smart-lock integration (Yale Keyless Connected) and fire-rated (FD30) configurations.

Colour and Finish

This is where the two brands diverge most visibly.

Palladio colours

Palladio offers 18 standard colours plus limited custom options. The range covers: - Classic whites and creams - Anthracite greys (RAL 7016, 7040) - Black (RAL 9005) - Heritage greens (hunter green, racing green) - Heritage blues (Oxford blue, navy) - Rosewood and oak woodgrain foils - Chartwell green (on request)

Colour longevity: Palladio's fibreglass outer surface is UV-stable and has shown minimal fade over 10+ year installations in UK conditions. The manufacturer guarantees the colour for 12 years.

Solidor colours

Solidor offers 24+ colours — the broadest range in the market — including: - All major greys (French grey, Schiefer, anthracite, Agate grey) - Black, jet black, traditional black - Reds (chili red, ruby, traditional red) - Greens (hunter, Cotswold, chartwell) - Blues (Duck egg, Oxford, Peacock) - Purples (heather, deep purple) - 30+ RAL colour options on request

Colour longevity: Solidor's GRP skin carries a 10-year colour guarantee. Historically, deep reds and some purples have shown visible fade after 6-8 years in south-facing installations — Solidor's current production has addressed this with improved pigment stability, but the legacy issue is worth knowing about if you are buying a Solidor door in a vibrant colour for a west or south-facing aspect.

Result: Solidor for catalogue breadth (24+ colours, 30+ RAL options). Palladio for colour longevity on a UV-stable fibreglass surface and the longer 12-year colour guarantee. For south or west-facing exposed positions, the longevity guarantee matters more than catalogue breadth.

Warranty Coverage

Palladio

• 12-year manufacturer warranty covering:

• Installer warranty typically adds 10-year workmanship cover
• 10-year CPA insurance-backed guarantee (via Vitrum Solutions)

Solidor

• 10-year manufacturer warranty covering:
• Glass unit covered for 10 years separately
• Installer warranty adds workmanship cover
• Most Solidor installers offer insurance-backed guarantees separately

Result: Palladio for the longest manufacturer-warranty window on the slab + colour + lock + glazing unit (12 years per dealer terms; 12 months on the brochure hardware figure — full slab warranty per dealer documentation). Solidor's 10-year coverage is competitive within its tier.

Design Range

Palladio design options

• Traditional panel designs: 24 main styles including stepped, raised-moulding, 4-panel, 6-panel
• Contemporary flat designs: 8 minimal-line options
• Glazed options: side panels, fanlights, sidelights in matching or contrasting styles
• Hardware: 8 handle colours (including rose gold, brushed nickel, black, chrome)
• Glass choices: 20+ patterns from clear to obscure

Solidor design options

• Traditional and contemporary: 30+ main designs
• Most design flexibility in the UK market
• Glazed options: full range of sidelights, fanlights, French door pairs
• Hardware: 12+ handle finishes including copper, antique brass, chrome, black
• Glass choices: 40+ patterns

Result: Solidor for catalogue breadth (~30+ designs, 40+ glass patterns). Palladio for the published Palladio range (~24 traditional panel designs + 8 contemporary, 20+ glass patterns), which covers most UK heritage and contemporary intent.

Price

Vitrum Solutions is a quote-driven business: we do not publish fixed price tables on Palladio doors because the cost varies with door style, glass options, hardware, sidelights and any structural alterations to the existing opening. Solidor pricing is set by the local Solidor installer network and varies similarly. Final price on either is set after a survey at your property.

Installation Considerations

Both doors install on similar schedules (4-6 hours for a single door swap). Slight differences:

• Palladio: ships as a complete pre-hung unit. Installers must be Palladio-approved. Vitrum Solutions is a Palladio approved installer.
• Solidor: also ships pre-hung. Dealer network is much broader — any competent composite door installer can fit a Solidor.

For both, FENSA registration is essential for the certificate. Both are typically delivered 4-6 weeks from order.

Installation in the UK

Vitrum Solutions installs Palladio exclusively across Buckinghamshire, Berkshire, Oxfordshire, Surrey, Hampshire, Hertfordshire and West London. The decision is based on field experience across 200+ installations: zero delamination on 10+ year service life, minimal colour fade on south-facing positions, low QA rejection at survey, and Irish manufacture with a short supply chain. Every installation carries a 10-year CPA insurance-backed guarantee and FENSA certification.

Solidor is installed by a separate national dealer network. For Solidor pricing or availability outside our service area, contact Solidor's Find a Dealer service.

Frequently Asked Questions

Can I see both doors before choosing?

Both manufacturers have display samples available through dealers. Contact Vitrum Solutions for a Palladio showroom appointment or use Solidor's Find a Dealer service on their website for local Solidor samples.

What about Rockdoor?

Rockdoor is a separate composite door brand at a different price tier. Construction is GRP skin over a timber core with polymer edge strips. Manufacturer warranties are shorter (8 years typical) and colour longevity is more variable than the monocoque-construction tier Palladio sits in. Vitrum Solutions does not install Rockdoor.

How long before I see an issue with either brand?

Realistic expectations for both brands at the premium-tier specification (Palladio's 65mm GRP monocoque slab or Solidor's 48mm timber-core construction): - Years 1-5: essentially maintenance-free - Years 5-10: occasional hinge adjustment, possibly one seal replacement - Years 10-15: likely cylinder/lock replacement - Years 15-25: possibly a frame reseal, hinges may need replacement - Years 25-30: typical end-of-life for budget composite doors; premium doors (Palladio, Solidor) can reach 30+ years

What's the U-value difference really worth?

Palladio's 0.85 W/m²K (solid) against Solidor's 1.2 W/m²K is roughly a 29% lower heat-loss figure on the door itself. In practice this is a small annual heating-cost difference, meaningful over a 30-year service life but not a decisive factor.

Getting a Quote

Vitrum Solutions installs Palladio composite doors across Buckinghamshire, Berkshire, Oxfordshire, Surrey, Hampshire, Hertfordshire and West London. Request a quote and we'll provide a written itemised price for your preferred style, colour and glazing configuration.

For more detail on Palladio specifically, see our Palladio Review and Best Composite Doors UK guides.