About this good practice
Multiple passive detached houses were built in Öland, Kalmar municipality. Using local materials, such as wood and natural limestone , along with energy-efficient technologies allowed addressing traditional, environmental, and economic architectural design values in Öland. Using limestone on facades reduced the maintenance costs when comparing with traditional wooden facades in Sweden. An interview with a real estate agent showed that wood along with limestone mirror the traditional and local architectural style in Öland and create a sense of welcome.
The passive houses were equipped with an integrated ground source heat pump (Thermia Diplomat Optimum) and a mechanical ventilation with a heat recovery system to improve the energy performance of the houses. Any such system allowed reducing the annual heating consumption and costs by 80 percent. The total average energy consumption of the passive houses was about 23 kWh/m2 in 2021.
A budget between 2000 € to 2500 € per square meter was needed for constructing the passive houses.
Between 2000 € to 2500 € per square meter.
Evidence of success
The use of wood and limestone in construction of passive houses (i) allowed enhancing owners’ satisfaction with the overall design, (ii) reduced the utilization of carbon intensive materials and (iii) cut the embodied-carbon from long distance transportation.
Accordingly, Växjö and Kalmar municiplaities now encourage the use local materials in the construction of buildings. However, all involved actors must ensure that these materials are produced and handled in a sustainable maner.
Potential for learning or transfer
A similar practice can be adopted in other regions to meet different architectural design values, thereby making buildings historically identifiable and creating a sence of welcome. In addition, using energy-efficient technologies along with local materials satifies national and international energy and climate targets.