- May 14, 2026|
- Doors|
- sandymount_admin
If you’re wondering how composite doors reduce energy bills, the answer is down to their construction.
Composite doors are unique in that they’re made using a combination of materials, rather than a single slab (wooden doors are just a layer of timber for example).
These materials are each chosen due to how well they complement one another and suit the demands of 2026 living. One of the non-negotiables for a modern entrance door is having elite energy efficiency, something that can save homeowners significant money on energy bills in the long run.
Composite doors are industry-leading when it comes to reducing energy bills, largely thanks to the fact that they feature an insulated core, which helps retain heat and as a result, lowers your dependence on costly appliances. This is in-amongst a host of other benefits, including elite security and a beautiful look, that make composite doors the ultimate home entrance.
How composite doors reduce energy bills
As mentioned above, composite doors are made using a combination of materials. Here’s how they work together to reduce heat transfer, lowering your dependence on costly appliances as a result.
Insulated foam core
At Sandymount, we supply and install composite doors with a dense polyurethane foam core. This section is designed to reduce heat transfer, so essentially in the winter the warmth is trapped inside your home by the foam, and in the summer it can’t enter… make sense?
Compared to a solid timber core composite door, our Hallmark composite doors are around 19% more thermally efficient.
Weatherproof tight seal
Older doors often suffer from gaps and warped frames that let draughts sneak through.
Composite doors are designed with a tight seal between the door and door frame, blocking out cold air and stopping warm air from escaping. This means less energy loss and a more efficient heating system overall.
Advanced glazing options
If you’d like glass panes in your new front door, the good news is that they won’t alter your home’s thermal performance.
The glass in our composite doors is double-glazed as standard, but triple glazing is available should you wish to upgrade.
Why is energy efficiency so important?
A thermally efficient front door is beneficial to both your wallet and the planet. Here’s why.
Lower energy bills
When your central heating doesn’t have to work as hard or make up for cold draughts, your energy costs come down.
Composite doors come at a higher initial cost than uPVC, but their elite thermal performance makes them a really wise long-term investment.
Sustainability
By reducing the amount of energy needed to heat your home, your carbon footprint will be lowered.
We speak to a lot of homeowners who really value sustainability when viewing new homes, both in terms of inheriting an environment that naturally creates a comfortable temperature, and one that releases minimal emissions.
What are the other benefits of composite doors?
Beyond home energy efficiency, there are plenty of other advantages of composite doors worth knowing about.
Strength and security
Built to exceed modern standards with multi-point locking and anti-snap cylinders, you won’t find a more secure front door than a composite.
Style and customisation
Our composite doors are available in over 150 designs, so it’s really easy to find one that suits your home. For instance, if you live in a rural setting or love a traditional look, woodgrain effects such as Darkwood or Oakwood are perfect.
Alternatively, if you’re in a new build or want something minimalist, you can select a colour like Anthracite Grey or Green.
Easy cleaning
Because of the smooth, scratch-resistant surface, composite doors are really easy to clean.
All you really need to do for them to look their best is wipe them with a damp cloth occasionally, and the stains will be gone.
A wide range of colours
Composite doors from Sandymount are available in any RAL colour, so you’re guaranteed to find something you like.
Longevity
You can reliably expect your new composite front door to last for a generation. They regularly last upwards of 30 years.
Composite doors from Sandymount Windows & Doors
Our composite door range, sourced by leading manufacturer Hallmark, is designed with thermal efficiency as a priority, as well as leading aesthetic choices and durability.
- Construction: GRP outer skin, insulating foam core, reinforced sub-frame and a galvanised steel-reinforced uPVC outer frame
- Styles: Traditional, modern and stable door designs to suit any property
- Colours: Including black, anthracite, sage, heather, oakwood, slate, cream and many more
- Hardware: Classic, Architectural, Heritage and Forged suites in chrome, gold, graphite and black finishes
- Energy ratings: Door Set Energy Ratings up to Class A, with U-values around 1.4 W/m²K
- Accessibility: Low threshold options available for easier mobility access
Who are Sandymount Windows & Doors?
We’re a friendly, family-run installer based in North Wiltshire, serving homeowners and trade customers across Oxfordshire, Gloucester, Gloucestershire and the outskirts of Bristol. Alongside our composite doors, we offer uPVC and aluminium windows, French doors, bifold doors and much more.
We’re proud to hold FENSA, BFRC and CHAS accreditations, so you can trust your home is in expert hands. We’re also proud partners of award-winning manufacturer Origin, giving you access to premium aluminium products too.
Want to see our products up close? Pop into our Cirencester showroom to browse the range, or get in touch for a free quote on your new door.
Call us on 01793 230684
Email windowsanddoors@sandymount.co.uk
Visit us at Unit 4, Sandpool Farm, Oaksey
