This Major Project Dissertation, will outline explorative researchsurrounding the feasibility of sustainable retrofitting methods andstandards. Focusing, on the UK’s disused Victorian infrastructure andtheir potential to be transformed into energy efficient, residentialproperties.The site I have chosen for my Dissertation Design Project is a formerVictorian textile mill (Greenwood Mill) situated in Halifax, WestYorkshire [Fig 1].The mill, is currently under procurement, to be repurposed as anapartment complex and resident gym facility. Included in theseplans, are 31 units, breaking the building up into small apartments(minimum area 53 m2, maximum area 80 m2). Arguably, the approveddesign, restricts exposure to natural light and does not allowaccessible circulation, in line with what is expected from modernliving accommodation [Fig 2].With this being the case, I am confident that my design and academicresearch (focusing on sustainable living, achieved by followingthe standards of BREEAM, WELL and EnerPHit by Passivhaus), willoutline additional options for building retrofits, like Greenwood Mill.Creating assets to be a part of the built environment’s decarbonisedlandscape.My design will feature, twelve duplex apartments and a glazed roofextension. The additional level, will elevate Greenwood Mill vertically,meeting the height of the adjoined structure, Berwick Street Mill. Acentralised entrance will guide the user through the entrance lobby(with access to stairs and a lift) and into the internal atrium, wherethe apartment hallway is situated. The Yorkshire Stone externalenvelope, will be respected and preserved and the existing windowswith be replaced with triple glazed replicas.I believe that my design will deliver high quality and sustainableliving spaces, potentially consuming less energy than the averagetown centre apartment. Meeting the challenge, to decarbonise theexisting residential building stock, as desired by the UK Government.