'More Space, Less Energy: Extending and Upgrading a 1940s Semi'

Thurs 8th October 2020

In this free interactive online tour you’ll learn about the retrofitting techniques that have enabled a significant reduction in the energy required to heat this home, as well as the lessons learned by the hosts throughout the extension and renovation process.

Hosts Bart and Rose have transformed this 1940s semi-detached house into an extended, sustainable home with a CO2 footprint around 60%, or 1.5 tonnes, lower than that of the original building. This largely DIY retrofit project was achieved through a detailed scientific approach, with a focus on significantly improving the home’s energy efficiency. The improvements to the house include an extension in line with Passivhaus standards, super-insulated floors, walls and roof, as well as a state of the art weather compensation boiler, and a PV array. The result of these features is a home which maintains an even temperature throughout, benefitting from significant draught reduction and the ability to remain cool in summer. 

Key features of this home:

  • Single storey extension built to Passivhaus standards.
  • Super-insulated screed floors with wet underfloor heating (UFH) throughout.
  • External Wall Insulation (EWI) on rear and side of existing house with front facade pending – mostly 200mm thick.
  • Solar PV panels (2.88 kWp) with diverter for heat store immersion element to supply domestic hot water.
  • Modern condensing boiler feeding 2-zone low-temperature heating circuit with weather compensation controller.

19 participants joined Bart’s online tour. See more about this exemplar retrofit in the Slides, Video and Case Study.


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