Doors

• Multi-Layered Construction: Unlike single-material doors (like standard uPVC or timber), composite doors use a combination of materials. A common high-efficiency design features a high-density polyurethane foam core, which can be up to six times more energy-efficient than traditional wooden doors.
• Low U-Values: Thermal performance is measured by "U-values" (the rate of heat transfer). The lower the number, the better the insulation. Modern energy-efficient composite doors typically achieve U-values between 0.8 and 1.4 W/m²K, far exceeding the standard building regulations requirement of 1.4 W/m²K.
• Advanced Sealing Systems: These doors are designed with weather-tight seals, compression gaskets, and sometimes triple seals in the outer frame to eliminate draughts and prevent moisture ingress.
• High-Performance Glazing: If the door includes glass, it usually features double or triple glazing, often filled with inert argon gas and coated with Low-E (low-emissivity) film to reflect heat back into the home.
• GRP Outer Skin: A tough Glass Reinforced Plastic (GRP) skin protects the core from the elements, prevents warping, and ensures the door remains airtight for its entire lifespan (often 30+ years). 

Benefits for Homeowners

• Cost Savings: By reducing heat loss, these doors can save homeowners between £90 and £110 annually on heating bills.
• Year-Round Comfort: The insulation keeps the home warmer in winter and prevents unwanted humidity and heat from entering in the summer.
• Sustainability: Improved efficiency lowers a household's carbon footprint. Many modern composite cores are also CFC-free and use sustainably sourced timber.
• Property Value: High energy ratings (often A or A++) can improve a property's overall EPC (Energy Performance Certificate) score, potentially increasing the home's market value. 

Popular Options & Pricing (2026 Data)

Energy-efficient composite doors vary in price based on style and features: 

• Entry-Level: 44mm foam-filled doors offer high efficiency at accessible price points (approx. £750 - £850).
• Premium: 70mm deep doors or those with triple glazing can reach A++ ratings and may cost £1,000+.