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Paul Testa has spent £230,000 retrofitting his semi-detached house in Sheffield, initially bought for £185,000 in 2013. The retrofit aimed to enhance energy efficiency and sustainability, with significant improvements including insulation, triple-glazed windows, and a mechanical ventilation system.

The total investment has surpassed the property's current estimated value of £350,000 to £400,000. Testa reports annual energy bills have dropped to under £1,000, aided by solar panels, and he plans to add a heat pump to further reduce energy costs. The retrofit has transformed the living conditions, providing a healthier and more comfortable home.