How to plan your semi-detached floor plan
A good semi-detached floor plan combines the cost-effectiveness of a shared wall with the living feel of a free-standing house. Since the half-house adjoins the neighbour on only one side, it has three external walls with windows and therefore feels almost like a detached house. The central special feature compared with other house floor plans is the party wall: it is built as a twin-leaf wall with a continuous separating joint, so that no impact sound and hardly any airborne sound passes between the halves.
For the room layout, the same principle applies as for the detached house: the open living-dining-kitchen area with a guest WC below, the bedrooms and children's rooms with the main bathroom above. Avoid placing noise-intensive rooms such as the bathroom, utility room or children's room directly against the party wall – this increases the living comfort for both parties. Since only three sides allow windows, the daylighting becomes more important: large window areas belong on the garden and sunny side, windowless utility rooms against the party wall.
An important fundamental decision is mirror-image versus offset. In the mirror-image semi-detached house, both halves are mirrored at the party wall – this reduces construction costs through shared routing of services, identical bathrooms and the same window axes. Anyone who plans together with the neighbouring party gets away most cheaply, but has to coordinate on the facade, roof shape and floor plan. An offset floor plan shifts the halves against each other or designs them differently: this brings more privacy on the terrace and in the garden and allows individual layouts, but costs more.
Semi-detached half-houses with 110 to 140 m² of living area are common – enough space for a four- to five-person family. Compact halves from 100 m² suit narrow plots, generous variants with a dressing room, a second bathroom and a study reach up to 150 m². Per square metre, the half-house usually turns out somewhat cheaper than the free-standing detached house, since the shared wall saves material and the plot can often be divided. Also provide a privacy screen or offset terraces so that the outdoor area offers privacy.
Before you commit to a layout, it is worth looking at concrete models. You can compare suitable houses together with their floor plan in our house overview. If you want to start with your own room programme, design your layout directly in the house configurator and then have suitable offers from vetted providers sent to you. Among our 140 vetted providers and over 3.050 floor plans, there is a suitable template for almost every semi-detached half-house.
