The core activity of Holling Service GmbH is the provision of services in the areas of sanitation, heating and cleaning. Specifically, this includes: Sanitary work such as bathroom renovations, renovations, boiler decalcification and replacement, decalcification/water softening systems, kitchen fittings and tile laying work; Heating work such as new construction, replacement, heat pumps, bathroom radiators and thermostat valves; Repairs and minor repairs in the sanitary area; Cleaning services such as maintenance cleaning, final cleaning and construction final cleaning for commercial and private customers.