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Challenge / Goal

This project concerns four fourteen-floor buildings and two four-floor buildings built in 1961. These buildings together host 302 apartments.
Just like most old buildings there are problems with thermal bridges and the fact that the climate shell is not airtight. This in combination with today’s standard of desirable indoor temperature leads to high energy consumption, since the warm air leaks out and cold air finds its way in.
A lot of heat and energy is lost in the existing system of installations in our buildings, due to long distances of poorly insulated pipes for heating and water, as well as the absence of heat recovery


Under the GrowSmarter project, the City of Stockholm has implemented energy retrofitting actions for the 6 tertiary buildings owned by Stockholmshem. In this retrofitting, external insulation is added to the whole building envelope in an ambitious manner and new windows and balcony doors have been installed with the best possible U-values for the project. This way there is control over incoming air. The only air intake is under the windows right behind the radiators to warm the air up before it continues into the apartment. The air exits by exhaust ventilation and the heat is recovered by a heat pump on the roof.

The plumbing system has undergone significant improvement, and all new pipes are properly insulated and a system for wastewater heat exchange installed.
Instead of installing a traditional system with a circulation pipe parallel to the water pipe, the project uses a solution where the two are installed one inside the other, to minimize the surface where heat may escape and keep the water temperature high.

New substations and heat exchangers for district-/geothermal heating are installed in every building. This way decreasing prior culvert losses is possible and users have enhanced control of heating, hot water and ventilation heat recovery in each building.

The new modern elevators are more effective and lighting fixtures in common spaces have been replaced with more efficient ones with motion control. In addition to this, PV-cells have been installed on the roof to provide renewable local energy for the building.
These smart installations combined make the building require less energy and the consumed energy will be recovered in the best way possible.

Following are the measures implemented:

Climate shell refurbishment of Valla Torg:

  • Additional insulation by 80 mm to façade and 200 mm to basement walls.
  • New type of construction for the roof with added insulation.
  • New four glass windows with U-value 0,7 W/(m2K).

New installations of Valla Torg:

  • Separate heat exchanger in every building for district- /geothermal heating.
  • Heat pumps recovering heat from the exhaust air and transmitting it to produce heat and hot water
  • Wastewater heat exchange system to preheat fresh water.
  • Installation of “pipe in pipe” system to reduce hot water circulation losses
  • Water-saving tap water fixtures to reduce water consumption
  • Electricity saving measures -Low energy lighting fixtures for common spaces -Modern and more effective elevators
  • Renewable energy: PV cells to produce electricity

Citizen participation

Two renovated apartments were displayed to show the end result. A recycling party was arranged by GS Stockholm and Stockholhmshem which saw participation and exhibition from industrial partners in flee market. Introductory lectures and workshops were conducted for the tenants.


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Time period

Planning time: 1 to 2 years

Implementation time: 1 to 2 years

    Main benefits

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