Glannant, Trefonen - 9th, 29th and 30th November

Property details

A four-bedroom detached house. Probably started as a 1 up 1 down agricultural dweling in the 1800s and has been extended 3 times, most recently in the 1980s.

What changes have you made to your home?

Before renovation our house was not insulated (other than spray froam in the roof space) and was heated with electric storage heater. It was EPC rating F. We added 170mm external wall insulation, 350mm rockwool insulation in the loft, 150mm insulation in the solid floor, and triple glazed windows. We installed a mechanical heat recovery ventilation (MVHR) system, 10.125kw solar array with battery, a 9kw air source heat pump with underfloor heating downstairs, radiators upstairs and a hot water cylinder. We now have an EPC rating of A. 

What have been the approximate energy savings?

Before renovation, the energy use would have been approximately 359 kilowatt hours per square metre (kWh/m2). We now use approximately 20 kWh/m2. In 2024, we used 2,490 kWh in energy for the house and 3,440 kWh to charge our car. We exported 4,560 kWh back to the grid. Our total annual energy bill (for house and car charging) in 2024 was £858.83 (after input-export). This year costs should be lower, as we are getting better at understanding how to maximise export rates and lower electricity import. We have saved approximately 13.59 tonnes for CO2 from the solar array alone.

What have been the benefits to you and your home?

Apart from energy savings, the house is without drafts, warm and dry. The MVHR means that fresh air is always circulating. The triple glazing means we can have large windows which emit no cold so you can sit right next to them and enjoy the view.

For more information, please see attached PDF.

Additional information

(PDF, 215kB)