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Multigenerational home (Mehrgenerationenhaus) floor plans: living apart, living together

In a multigenerational home (Mehrgenerationenhaus), the floor plan determines how living together works: two self-contained dwelling units with their own entrances protect privacy, while shared zones such as the garden or laundry room connect the generations.

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How do you plan a multigenerational home correctly?

Horizontal division has proven itself: the low-barrier granny flat (Einliegerwohnung) of 40 to 60 m² sits on the ground floor, while the family dwelling spans the ground and upper floors or fully occupies the upper levels. Two separate entrances, separate meters and a sound-insulated stairwell are essential. Total living areas of 160 to 250 m² from around EUR 420,000 turnkey are typical (as of 2026).

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Multigenerational Home Floor Plans: häufige Fragen

Kompakte Antworten für die erste Planungsphase.

Which layout suits a multigenerational home?
Three models dominate: the granny flat on the ground floor with the family dwelling above, storey-by-storey division into two full-value floor apartments, and the side-by-side semi-detached principle under one roof. For older residents, the single-level unit with a floor-level shower and threshold-free transitions is the first choice – the family takes the storeys with stairs.
Does the second dwelling unit bring funding advantages?
Yes: if the granny flat is designed as a self-contained dwelling unit with its own access, kitchen and bathroom, it can count as a second dwelling unit in KfW funding and raise the loan ceiling accordingly. Parts of the construction costs can also be claimed for tax purposes if the unit is later rented out. The exact conditions should be clarified with a financing adviser and tax adviser before the building application.
How much living space does a multigenerational home need?
As a rule of thumb, 160 to 250 m²: 100 to 160 m² for the family dwelling plus 40 to 60 m² for the granny flat, along with shared ancillary areas. More important than sheer size is the sound decoupling between the units and a floor plan that allows later changes of use – for instance when the granny flat is eventually rented out or used by care staff.
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