The Netherlands, Utrecht – Overvecht Net Zero retrofit

19 May 2021

Mustbe0 projects is all about apartments buildings, so let’s check out a realised high-rise project.

Housing organisation Portaal with construction company Dura Vermeer

After completion of successful net zero retrofits for single-family homes, Housing Organisation Portaal decided to moving on up to retrofit multi-story buildings. Together with construction company Dura Vermeer, a net zero deep retrofit for 110 apartments at the Kwangodreef, Gambiadreef and Kasaidreef in Utrecht was realised.

Portaal is one of the pioneers in realising net zero energy homes and has completed hundreds of them all over the Netherlands. Together with builder Dura Vermeer, also a frontrunner in this area of expertise, they again successfully delivered these multi-story apartment buildings. While the residents were at home, window frames were renewed, facades repackaged, new ventilation systems and PV panels installed and kitchens and bathrooms replaced.

Most important elements:

  • Energy use before the renovation: 3.245 kWh/m3 per year
  • Energy use after the renovation: 848 kWh/m3 per year
  • Ventilation by means of balanced ventilation with a Heat Recovery Unit
  • CO2 controlled (system D)
  • Entire shell thermally insulated:
    Roof: Rc= 7
    Closed façade: Rc = 6
    Open façade, triple glas: U-value = 0,9
    Ground floor: Rc = 4


Housing organisation Portaal with construction company Dura Vermeer.

Click here for the complete photoalbum

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