-          Original design recreated of new double-glazed timber French doors and clerestory windows with unique stained glass.

-          Layout changes achieving open-plan connectivity for ground floor living areas and kitchen, all offering views towards the river.

-          Reconfiguration of spaces to add two more bedrooms with en-suites; library and office space; and a utility room.

-          Fully utilised eaves’ spaces for essential storage cupboards.

-          Redesign and rebuilding of existing outbuildings serving a boatyard.

-          Design for a garden space for entertainment and home-office work.

-          Building fabric was upgraded to criteria explored in EnerPHit – the PassivHaus standard for retrofit buildings – both in terms of thermal performance and airtightness.

-          The new allocation of spaces in main areas allowed for passive natural and cross ventilation, which was complimented with newly installed MVHR - mechanical ventilation system with heat recovery.

-          New underfloor heating for better comfort to the occupants.

-          The heat source is a ground source heat pump with boreholes deep 130m, which installation was challenged logistically by transporting all the heavy equipment on the island via a barge.

-          Solar slates on the south-facing roof pitch match the natural slate which is the original roof cover. Part of the daily energy demand is met and a battery storage allows for energy to be saved up.

-          Investigation into the existing structure to check on cause of past subsidence to cast iron columns and design necessary for remedial works.