In carbon-neutral cities, housing companies must become as energy efficient as possible and adopt solutions to reduce greenhouse gas emissions. Residents of a housing company are rarely active real estate developers, even though the property that is managed and the decisions taken are significant. According to the companies, the poor accessibility of housing company information and the flow of information between the various actors continue to be a bottleneck in improving energy efficiency.The companies and managers are unclear or motivated about general energy efficiency measures and which service or solution provider could provide them. From the point of view of companies providing services, housing companies are a challenging customer field and sales to this customer group are made by a limited number of companies. Information on housing companies is fragmented in multi-stakeholder systems, on which it is difficult to obtain information for a resident or share information with a company offering energy-efficient solutions. Information is not always available even in digital form. It is difficult for providers of new solutions to enter this market and develops solutions for office buildings where the management of the property is in the hands of professionals. Housing companies need information and demonstrations about solutions that allow for the availability of housing company information to both shareholders and other parties (own data management) taking into account privacy protection. The natural role of the smart city is to provide information infrastructure — data and platforms — for its residents (city-as-a-platform). The project accelerates the digital environment of housing companies (1) by defining the practices of ownership and licensing of data in housing companies, (2) collecting housing company information for data platforms and developing the sharing of own data in the urban data model, (3) by promoting new platforms, services and data-driven management to the housing company, and (4) by sparring companies providing digital and information services in the use of own data and open data and developing customer understanding. As a result of the digital transformation, housing companies will become an active part of the smart city. With the digital transformation, the project develops a service ecosystem for the maintenance and renovation of housing companies, so that knowledge and know-how about solutions that improve energy efficiency are included in the renovation planning. The project develops dialogue, expertise and cooperation models among the actors in the service ecosystem (enterprises and municipal organisations) in order to make the implementation of energy-efficient solutions as easy as possible in the service ecosystem. The project will develop opportunities for companies offering climate-smart solutions to help housing companies promote environmental sustainability. With the project, the management of the personal data of housing companies facilitates rational decision-making and interaction in housing companies. The project promotes long-term knowledge-based planning of housing companies. Services developed for the management of personal data of housing companies take into account different user groups on an equal footing, in which case, for example, gender or language skills do not become a challenge to take advantage of the services that are being developed.