We custom built an addition to an existing century-plus-old home in a historic waterfront neighborhood on Cape Cod. The addition includes two bedrooms and a bath, an open floorplan main living space with a living room, and a kitchen and dining area all of which have great views of the ocean. The space was to be used by a person with mobility issues, so there are no thresholds between the extra-wide doors or leading into the large, glass-enclosed shower. The kitchen is arranged along one wall to allow ease of use and certain elements – such as the microwave – were positioned in the lower level of cabinets so they were easily reachable. A custom-built fireplace surround incorporates natural beach pebble insets and the ceiling in the primary living space is finished with insets of pickled pine. We relocated the home’s primary entrance to create a transition from the existing portion to the addition. Overall, the exterior of the addition is barely discernable from the existing home.