House 3.RB.7 is situated in a closed residential complex in the suburbs of Sofia, Bulgaria. The project aimed to create a highly functional home for a six-member family by applying resource-efficient practices within a contemporary design. With a total budget of 670,000 BGN, the renovation included layout reconfiguration, new heat pump HVAC with heat recovery, underfloor heating, outdoor extension, custom furniture and finishes – resulting into a cohesive, modern and adaptable interior.