How long does a composite door last?

The GRP skin of a composite door is UV-stable and colour-fast for 25–30 years in normal UK conditions — most manufacturers guarantee the finish for 10–25 years. The foam or solid timber core and structural integrity should last 35+ years. The multipoint lock hardware should be serviced every 5 years and may need replacement at 15–20 years. Composite doors generally require no painting — wipe-clean maintenance only.

What is the most secure composite door for a London home?

Rockdoor is the most security-focused composite door brand in the UK — steel-reinforced frame, dual-density foam core, stainless steel central reinforcement strip, tested to PAS 24. Combined with a Ultion 3-star anti-snap, anti-drill, anti-pick cylinder (approximately £60–£90 to add to any composite door order) and a multipoint lock with six or more locking points, a security-specification composite door provides excellent protection against the most common London burglary methods.

Can I get a composite door in any colour?

Composite doors are available in a wide range of standard colours from most manufacturers — typically 20–40 colours including Chartwell Green, Anthracite Grey, Flemish Blue, Duck Egg Blue, and Black. Custom RAL colours are available from some manufacturers (Solidor, Rockdoor) at a 15–25% premium. Unlike timber, composite doors cannot be field-painted a custom colour — the GRP skin requires specific factory paint systems.

Do I need a new door frame when replacing a composite door?

In most cases, yes — composite doors are manufactured to specific frame dimensions and cannot be fitted into an existing uPVC or timber sub-frame. A new composite door frame is supplied with the door. If the structural opening (brick or blockwork) is sound and plumb, the new frame is simply fitted into the existing opening — no structural work required. If the structural opening is rotten (common in Victorian terraces), the lintel and reveal condition should be assessed before ordering.

Composite Door Cost London 2025 | Builderr

How Much Does a Composite Door Cost in London?

A composite door costs £1,200–£3,500 installed in London, depending on size, style and brand. Composite doors use a GRP (glass-reinforced plastic) outer skin over a foam-filled solid timber core — providing superior thermal performance, security and low maintenance compared to uPVC. Mid-range Solidor, Rockdoor or Endurance units cost £1,400–£2,200 installed for a standard front door opening.

Composite door cost by brand and specification

Composite door installation cost in London varies by brand tier and door size. Entry-level composite door (800mm × 2,100mm, standard hardware): £900–£1,400 installed. Mid-range — Solidor, Rockdoor, Endurance (standard 70mm slab, multipoint lock): £1,200–£2,200 installed. Premium — Residence 9, or bespoke GRP door (100mm slab, Ultion or Avocet lock, chrome or satin hardware): £2,000–£3,500 installed. French composite doors (pair, 1,600mm × 2,100mm): £2,500–£5,000 installed. Stable composite door (split horizontally, 800mm × 2,100mm): £1,800–£3,000 installed. Side panel or top light addition: £300–£800 per panel. Key brand comparisons: Solidor (solid timber core, 48mm) — good thermal performance, wide colour range, 10-year guarantee; Rockdoor (ultra-secure, PAS 24 certified, 70mm foam core, stainless steel reinforcement) — best security specification; Endurance (44mm solid timber core, similar to Solidor at slightly lower price point). All reputable composite doors are PAS 24 certified, Part Q Building Regulations compliant, and achieve a U-value of 1.4–1.8 W/m²K.

Composite vs uPVC vs timber front doors

The three main front door materials each have distinct advantages. Composite: the most popular choice for front door replacement in London non-conservation-area properties. Advantages: no painting required; superior thermal performance to uPVC; better security (solid timber or foam core with steel reinforcement resists kick-in and drill attacks better than hollow uPVC); GRP outer skin is colour-fast and UV-resistant. Disadvantages: cannot be painted a custom colour; limited to the manufacturer's range of moulded designs. uPVC: least expensive option; acceptable thermal performance with PU foam core; lighter weight; slightly less security than composite. Best for: rental properties and budget renovations. Timber: required for listed buildings and most conservation area front elevations. Best for: Victorian and Georgian properties where original character is important. Advantages: can be custom-painted any colour; architecturally authentic; extremely durable with proper maintenance. Disadvantages: 5–7 year repaint cycle; most expensive option.

Planning and Building Regulations for composite door replacement

Replacing a front door in a non-listed, non-conservation-area property is permitted development — no planning permission or Building Regulations application required. However, the replacement door must comply with: Part L (thermal performance): a replacement external door must achieve a U-value of 1.4 W/m²K or better — all reputable composite doors meet this requirement. Part Q (security): replacement external doors should ideally meet PAS 24:2022 — most composite doors include this certification as standard. Conservation areas: replacing a front door with a composite in a traditional-style moulding is often acceptable to planning authorities even in conservation areas. However, some Article 4 Directions require original-style or matching-material doors — check with the planning department before ordering. Listed buildings: LBC is required for any front door change — composite doors are almost never approved in listed buildings.

Composite door installation in London

A composite door installation in a London terrace typically takes half a day (3–5 hours). The process: survey and measure existing opening (allow 7–14 days from survey to delivery for a manufactured composite door); remove and dispose of existing door and frame; check and square the structural opening; fit new composite door frame, ensuring plumb, level and square; fit door leaf on frame; adjust and align (multipoint locks require precise fitting); seal externally; commission multipoint lock and test all locking points; provide FENSA registration documentation. Key specification decisions at survey: threshold (rebated low-threshold for step-free access or standard threshold); letterbox position; glazing — decorative glass in front door panels adds light and character but reduces security — specify toughened glass in all door light positions.