Why Your Front Door Matters for Energy Efficiency
An old or poorly fitted front door can lose as much heat as a single-glazed window. Modern energy-efficient doors achieve U-values of 0.8-1.0 W/m²K compared to 3.0-4.0 W/m²K for a typical old timber door. Upgrading your front door alone can save £20-£50 per year on heating and significantly reduce draughts.
Door Material Comparison
| Material | Typical U-Value | Cost Range | Lifespan | Security Rating |
|---|---|---|---|---|
| Composite | 0.8-1.2 W/m²K | £800-£2,000 | 30-35 years | Excellent |
| uPVC | 1.0-1.4 W/m²K | £500-£1,200 | 20-25 years | Good |
| Timber (modern) | 1.0-1.5 W/m²K | £1,000-£3,000 | 30-50 years | Good |
| Aluminium | 1.2-1.8 W/m²K | £1,200-£3,500 | 30-45 years | Excellent |
Composite Doors Lead on Performance
Composite doors combine a solid timber or foam core with a GRP (glass reinforced plastic) outer skin. This construction achieves the lowest U-values while providing excellent security ratings. Most composite doors are Secured by Design accredited, the official UK police security initiative. Leading brands include Solidor, Endurance, and Rockdoor.
What to Look for When Buying
Check the door energy rating from A++ to E under the British Fenestration Rating Council scheme. Ensure multipoint locking as standard. Insist on PAS 24 security testing certification. Check the threshold seal quality as this is where most draughts enter. Request the U-value certificate and compare it against the Building Regulations requirement of 1.8 W/m²K for replacement doors.
Installation and Building Regulations
Replacement doors must comply with Building Regulations Part L and Part Q. Use a FENSA or CERTASS registered installer who provides compliance certificates automatically. Installation typically takes 2-4 hours for a straightforward replacement. Budget an additional £100-£200 for making good the surrounding brickwork and decoration.
