A contemporary, three storeys over semi-basement, modern extension along with an extensive refurbishment of a Garda Station. Limited storage space was overcome by the use of Air Source Heat Pump technology to allow the building to achieve its high specification energy ratings of nZEB and BER A3. Early stage detailed design was critical in avoiding clashes and selecting appropriate routes, voids and riser location for the many services required. In-house dynamic simulation was used to validate the design’s environmental sustainability. The project was a winner in the 2021 RIAI Cultural/Public Building and Sustainability awards.