How energy efficient is a Guardian Home Extension?

Home extensions can offer families of all shapes and sizes space to get more enjoyment out of their home— whether it’s a dedicated area to deal with the washing load or a complete reconfiguration of the ground floor to embrace open plan living. However, this addition to your home’s footprint can have you wondering how it will contribute to your heating and cooling bills? When developing the Guardian Home Extension, a highly insulated shell was a key priority for our team ensuring rooms that are efficient and cost-effective to keep warm and comfortable without giving over valuable floor space to massively thick layers of insulation. We achieved this by combining high quality components and production approaches.


Guardian Warm Walls

Guardian Warm Walls feature innovative Kingspan TEK structural insulated panels (SIPs). Used to build whole houses, this advanced building technology is made from a highly insulated core which is sandwiched between two layers of oriented strand board (OSB). These are designed to fit together with an enhanced jointing system that ensures a tight fix with no gaps where heated air can leak out, or cold external air can leak in.

Guardian Warm Wall can comfortably achieve a thermal performance U-value of 0.18 W/m2K once fully constructed with external and internal finishes. This meets the thermal performance requirements of the Building Regulations across the UK and ensures a space that cab be heated  quickly and more affordably than most typical brick and mortar extensions.

What’s more, thanks to their excellent insulation performance, Guardian Warm Walls can be a lot slimmer than traditional brick walls. This can allow for additional internal floor space within a given footprint. For example, we estimate that on a typical 5 x 4 m extension, you can gain 20% more internal floorspace.

Guardian Warm Roof

To finish the extension’s ‘envelope,’ the Guardian Home Extension uses the Guardian Warm Roof System. This features a triple layer of insulation and can achieve a U-value of 0.15 W/m2K or 0.12 W/m2K – one the lowest in the industry.  It has also been independently tested by the Building Research Establishment (BRE) to certify it can effectively manage condensation risk.

You can learn more about our Warm Roof here.

Precision fit

The Guardian Home Extension is manufactured offsite by one of our dedicated network of Certified Fabricators. They have extensive experience fabricating our products and have received training to ensure the highest quality delivery of the Home Extension, with no margin for error. The panels are custom designed to your home’s unique requirements, with precise apertures for windows and doors. This helps to ensure a precision finish, allowing insulation to run virtually continuously throughout walls and roofs and limiting air-leakage.

Request a quote

If you’re looking to add a Guardian Home Extension to your home, simply add your details to our quote form below and one of our Certified Installers will be in touch to get things started.


To find out more, call us today on 
0800 066 5832 or get a quote below

Get a Quote

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