The new building replaces a small existing building that could not be converted or extended according to the requirements of the clients. The result was a building suitable for three generations with two residential units, both with direct access to the garden. It was a challenge in architecture to keep the building compact and the construction costs affordable, which was ideally solved together with the barrier-free residential unit on the ground floor and without a cellar.

For the owners, it was a matter of course to realise their building as a certified passive house in ecological timber construction, to equip the whole thing with a heat pump and plus technology and, together with e-mobility, to realise a holistic climate-friendly concept. Principle: Use little energy in the life cycle, use the little energy 100% regeneratively and provide it at the maximum on site, thus achieving a high degree of independence and actively taking responsibility for climate protection.

Thermal envelope

Exterior wall: U-value = 0.118 W/(m2K)

Basement floor / floor slab: U-value = 0.136 W/(m2K)

Roof: U-value = 0.135 W/(m2K)

Frame: Optiwin, Purista U w-value = 0.73 W/(m2K)

Glazing: U g-value = 0.53 W/(m2K) g -value = 53 %

Entrance door: U d-value = 0.78 W/(m2K)

Ecological aspects

Wooden construction with regional wood and consistent use of natural building materials. Plus-energy concept with photovoltaics (21.8 KWpeak), batteries (9.8 kWh), energy manager, 2 wall boxes, for maximum self-sufficiency in heat and electricity. At the sunny location, 18,200 kWh of PV electricity are forecast on the east-west oriented roof surfaces.

Passive House, plus technology and e-mobility as an ideal combination of living, working in a home office and mobility, with maximum self-sufficiency and self-use on site. An additional emergency generator was installed to ensure self-sufficiency at all times, which was easy to realise given the building's low energy requirements. The example of this building shows that all the requirements for a secure and cost-effective energy supply in the future can be easily met if little energy is required to operate a building!

PE demand (non-renewable Primary Energy): 54 kWh /(m2a ) on heating installation, domestic hot water, household electricity and auxiliary electricity calculated according to PHPP. PER demand (renewable Primary Energy): 39 kWh /(m2a ) on heating installation, domestic hot water, household electricity and auxiliary electricity calculated according to PHPP

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