Arosfa is located on a steeply sloping site overlooking Goodwick, Pembrokeshire, close to the seafront of Fishguard Bay. jpa was commissioned in 2013 by the owners, a couple, to reconfigure and enlarge their three-storey Victorian semi-detached house. Our design proposed a pavilion volume running transversely behind the existing Victorian house to connect to the terraced garden and afford outstanding views to the east across Fishguard harbour and out along the Pembrokeshire coastline beyond. The ground floor is exposed cast in-situ waterproof concrete, acting as structure and external finish, internally insulated. The timber cladding at first floor is Kebony, chosen for its for durability and reduced maintenance requirements. Internally: at ground floor, the new volume adds a garden store, along with a bathroom and dressing room serving the master bedroom (located within the volume of the existing house). At first floor, the heavily-glazed open-plan kitchen, dining, living room opens out onto the garden, and is served by a new utility room and shower room. The GIA of the new element is 110m2. The pavilion has a sedum roof, with solar thermal and PV panels discreetly mounted on the pre-existing rear retaining wall.