The core activity of Würmli Bau GmbH is the provision of construction services, particularly in the areas of: renovations and extensions (e.g. insulation, carports, elevator shafts, winter gardens, kitchen and bathroom renovations); agricultural buildings (e.g. irrigation channels, manure pits, concrete slabs, stable construction); customer-specific work (e.g. concrete foundations for heat pumps, advertisements, signposts); garage construction; and garden elements (e.g. garden houses, stairs, and garden retaining walls). The company focuses on renovations, agricultural buildings, and customer-specific work that is considered too small by larger companies.