Composite Front Doors & Aluminium Bi-Fold Doors: Installed Cost Benchmarks
How adding high-security composite front doors and multi-pane bi-folds affects whole-house window packages, fitting labour, and structural lintel requirements.
- Turnkey GRP composite front door supply and installation ranges from £1,050 to £1,450 for standard styles, or up to £1,800 for designer architectural slabs.
- 3-metre 3-pane aluminium bi-fold doors average £2,800 to £3,400 installed with 28mm toughened low-E double glazing and trickle vents.
- PAS 24:2022 security accreditation and Ultion 3-star diamond deadbolts are required for Approved Document Q compliance on new openings.
- Package discounts: Combining whole-house windows with entrance doors saves £300–£600 in unified scaffolding, skip hire, and sealant labour.
Key Considerations for UK Property Owners
Replacing aging windows and doors is one of the highest-impact thermal and security upgrades you can undertake. Under Approved Document L1B of the UK Building Regulations, all new replacement windows installed in existing dwellings must achieve a maximum U-value of 1.4 W/m²K, which modern A+ argon-filled double glazing comfortably beats at 1.2 W/m²K.
Beyond thermal performance, installations must satisfy Approved Document F regarding continuous or trickle ventilation, Approved Document K for safety glazing within 800mm of the finished floor level, and Approved Document Q / PAS 24:2022 for secure ground-floor accessibility.
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