Dolphin House is a Dublin City Council housing estate constructed in the 1950’s. Phase 1 of the regeneration of Dolphin House was completed in November 2018. This initial phase of a wider masterplan consists of deep retrofitting three existing housing blocks to provide 63 refurbished apartments and providing 37 new build homes (28 apartments and 9 houses), totalling 100 units on the one hectare site. The overall area of the development both refurbished and new is 8,450sq.m. Previously underutilised green spaces between the blocks of the original scheme have been incorporated within the design, using the new build elements to form new internal courtyards, which have been landscaped with play areas provided. Where the original scheme did not address the Grand Canal, terraced housing has been designed to create a new frontage. The existing blocks were upgraded to a high level of thermal comfort by externally insulating the external walls, increasing roof insulation to current requirements and by installing new highly efficient triple glazed windows. In order to eliminate cold bridges, the existing walkways were removed and replaced with new, wider ones. In addition, a large array of photovoltaic panels have been placed on the roofs to supply a percentage of electricity to the new and refurbished dwellings.