Self-Heating Home Project Featured on Grand Designs Deemed a Success

A couple's unconventional approach to sustainable living, creating what they aimed to be the UK's first self-heating home, has been revisited on the television show Grand Designs, with the homeowner maintaining that the controversial project was ultimately worth the effort.

In 2017, Dr. Andrew Smith and his wife Margretta embarked on a mission to construct a home that would rely on solar heat stored in insulated earth banks. The ambitious project, planned for completion in 18 months with a budget of £300,000, faced significant criticism online. Skeptics questioned the use of materials like concrete, polystyrene, and plastic, with some labeling the endeavor "utterly bonkers" and "environmentally unfriendly."

Despite facing construction challenges, including issues with concrete, the Smiths moved into their unique home with their children in 2020. A recent follow-up on Grand Designs saw host Kevin McCloud return to assess the property's performance.

Andrew Smith insisted that the "blood, sweat and tears" invested in the home were worthwhile. Margretta Smith reported that they were "enjoying the home" and that it was "serving us as a home and it's lovely." Reflecting on recent extreme weather, Andrew noted that the house remained "remarkably cool" during a heatwave, to the point where visitors assumed it had air conditioning. He also highlighted that the house's design helps mitigate overheating, a growing concern due to changing climate norms.

The home features four bedrooms, a living space with a log burner, and a central courtyard designed to maximize natural light. The sunken design ensures that even bedrooms enclosed by earth banks remain dry and free from mold. The property also incorporates an innovative hot water system that captures heat from outgoing shower water, potentially saving a third to a half of hot water usage. Additionally, VB panels are used for electricity, and solar panels contribute to water heating in the summer.

The earthbank heat store system is designed to collect summer heat and release it into the earthbank for use during colder months. Andrew explained that the current stored heat reflects the summer heatwave, making it available for use in February.

Prior to this project, the Smiths lived in a countryside cottage inherited from Andrew's family. While Margretta desired a contemporary and beautiful home, Andrew's primary focus was on his thermal experiment. He admitted to taking "eco-living to the extreme" at times.

Their children, Jasper and Imogen, expressed positive views of the home. Imogen described the setup as "unique" and recalled enjoying sleepovers during the construction phase. Jasper stated a preference for the new house over the cottage, expressing pride in his parents' achievement.

Andrew also mentioned that the concrete used in the build incorporated 60% less carbon than standard concrete and estimated it would take eight to ten years to achieve carbon neutrality for the property. The final cost of the project was £330,000, a figure McCloud found surprisingly close to the initial estimate, especially considering the labor involved.

Margretta acknowledged the physical demands of the build but praised her husband's positive attitude. She expressed contentment as long as the home remains comfortable and functional, allowing Andrew to continue with his creative energy-efficiency experiments. Andrew concluded that the house functions as a reliable shelter, capable of providing heat and hot water independently, with the potential for off-grid living if necessary.