Prefabricated house floor plans with prices for your building project

The floor plan has a direct effect on costs: compact, rectangular building bodies with little external wall area are the cheapest, while angular shapes with bay windows or dormers increase the price per square metre. In detail, the following points are the main cost drivers in 2026: more than one bathroom, elaborate roof shapes, large window surfaces and individual changes to the standard floor plan. Turnkey, prefabricated houses cost roughly 2,000 to 3,500 €/m², a shell-finish house (Ausbauhaus) from around 1,300 €/m². Standard floor plans can usually be adapted within certain limits — deeper changes to the factory prefabrication add 5,000 to 25,000 euros depending on scope. Anyone who wants to keep costs under control plans early with a clear room programme.

The most economical in 2026 are compact floor plans with a clear structure: first, the rectangular bungalow or the two-storey single-family house with bathrooms stacked above one another — this shortens the pipe runs and saves money. Second, an open living-dining area instead of many small individual rooms, because fewer walls and doors are needed. Third, a single full bathroom plus a guest WC instead of two large bathrooms. Fourth, a plain gable or mono-pitch roof instead of a hip or hip-and-valley roof. Fifth, doing without bay windows, dormers and extensions. Anyone who still needs more space gains it through an efficient layout — and not through additional square metres, which quickly add up at 2,000 to 3,500 €/m².