Rising household energy costs remain a concern in 2026, as homeowners continue to feel the impact of increasing living expenses and the growing cost of running a home.
As a result, homeowners are reassessing the insulation and efficiency of their homes in a bid to keep as much heat as possible inside and reduce reliance on heating. Many focus on glazing, loft insulation and boilers, but overlook the pivotal role a front door plays in thermal performance.
Entrances can be significant sources of heat loss. Old doors may lack sufficient insulation, with draughts and cold spots common around ageing doors. Improving thermal performance reduces heating demands, and replacing your underperforming front door is a great place to start your upgrades.
Composite doors are designed to retain warmth. They serve as an energy-conscious upgrade for any homeowner growing concerned about their current doors’ performance.
Thermal Performance Comparison: Endurance vs Standard Doors
The thickness of a door usually influences the insulation it provides. The core material of a door also plays an important role in determining the heat retention of an entrance. Both aspects are crucial to creating a door that meets modern performance standards.
Solid timber core doors and foam-filled doors therefore perform very differently. In lower-quality doors, weather-sealing and density often fall short of requirements.
Performance goes beyond just what you see. Our comparison matrix might help you make a more informed decision on the door you invest in to secure the performance of your home.
| Door Material | Average Thickness | Core Type | Thermal Performance |
|---|---|---|---|
| Endurance Composite | 48mm | Solid Timber Core | Excellent |
| Standard Composite | 44mm (typical) | Foam-filled Core | Good |
| Traditional Timber | Varies | Solid Timber | Moderate |
| uPVC Panel Door | Thinner panels | Hollow/Reinforced | Lower |
Endurance’s Solid Timber Core Explained
The solid timber core of an Endurance Door provides strength and density. It is 48mm thick, and on average, 10% thicker than many standard composite doors. The higher mass helps to retain internal heat and provides greater structural stability.
With better long-term performance and reduced warping risk, Endurance doors are designed to withstand all UK weather conditions. They support your overall home efficiency and provide a worthwhile upgrade to your current entrance.
