Alternative sanitation solutions such as Urine Diverting DryToilets are not based on a sewer system. Instead they require special operation and maintenance efforts to stay in working condition. In many cases, especially in urban and peri-urban areas, service providers are required to fulfil those functions against a fee. Such alternative systems, as they are often introduced by development projects, often face problems after the end of the development project in question putting at risk the success of the project. One of the reasons is the difficulty to establish service providers that will continue offering the services once external support has stopped. Due to the poverty of large parts of the populations, the costs of such services must be low while at the same time be sufficiently high for the service provider to continue to offer the services. Cost calculation and comparison methods help to assess the costs of a project and to find the most cost effective solution for a given context. Applying those methods when establishing operation and maintenance services therefore can be an important step towards their sustainability. This thesis tries to adapt existing methods and to apply them to such a scenario.