Introducing the Alliance Report
The publication âBĂŒndnis fĂŒr bezahlbares Wohnen und Bauen â Wohnungsgenossenschaften als Partner der Kommunenâ is a research study produced by the Bundesinstitut fĂŒr Bauâ, Stadtâ und Raumforschung (BBSR) on behalf of the Federal Ministry for the Environment, Nature Conservation, Building and Nuclear Safety (BMUB). Authored by a team of senior researchers â Sigrid Schaefer, Carolin KrĂŒger, Katrin Witthaus, Jan Krimphoff, Lena Bruce and Heike Schröder â the work draws on extensive field research, expert interviews and ten detailed case studies across German municipalities. Its purpose is to assess how housing coâoperatives can support affordable, sustainable living in partnership with local authorities.
Scope and Methodology
The study combines secondary literature review, expert workshops and qualitative analysis of ten representative housingâcoâoperative projects. Selection criteria included diversity of city size, regional distribution, the intensity of municipal cooperation and the presence of innovative building concepts. Data were gathered through interviews with coâoperative managers, municipal officials and consultancy firms, as well as site visits to projects ranging from new construction to retrofitting historic stock. The research aligns with the broader âAllgemeine Ressortforschungâ programme and the federal âAlliance for Affordable Living and Buildingâ launched in 2014.
Key Findings on Housing Stock
Housing coâoperatives own roughly 2 million dwellings, accounting for about ten percent of Germanyâs rental market and providing homes for more than five million residents. In the 20 largest German cities, coâoperative market shares vary from 1 percent in Berlin to over 20 percent in Dresden, with Hamburg and Cologne each exceeding 14 percent. Overall, coâoperatives hold around 9.8 percent of the national rental stock, demonstrating a significant capacity to influence housing affordability.
Sustainability Contributions
Coâoperatives reinvest surplus earnings into modernisation, energyâefficiency upgrades and barrierâfree adaptations, thereby extending the lifespan of existing buildings and reducing the need for new construction. Case studies highlight measures such as photovoltaic installations, districtâheating integration and comprehensive retrofits that lower carbon emissions while preserving affordable rents. The coâoperative modelâs emphasis on memberâowned assets supports longâterm stewardship of the housing stock.
Coâoperation Models with Municipalities
The research identifies three principal forms of partnership:
- Formal cooperation contracts â legally binding agreements that link municipal land provision, publicâfunding access and coâoperative development targets.
- Joint development projects â coâoperative participation in urban regeneration, mixedâuse quarters and social infrastructure (e.g., dayâcare centres, community spaces).
- Informal networks and advisory platforms â regular exchange forums that facilitate knowledge sharing, joint planning and coordinated action on issues such as ageing populations and refugee accommodation. Successful examples include the LĂŒbecker Bauvereinâs multiâyear contract with the city of LĂŒbeck and the investment bank of SchleswigâHolstein, which enabled flexible allocation of publiclyâfunded units and financed neighbourhood improvements. Similar arrangements in Hamburg, Dortmund and Stuttgart illustrate how coâoperatives can leverage municipal land, planning incentives and funding programmes to deliver affordable units while meeting local sustainability goals.
Economic and Social Impact
Coâoperatives generate around âŹ4.5 billion in annual turnover, with net operating margins typically reinvested in member services, building maintenance and community projects. Their democratic governance â one member, one vote â ensures that profit maximisation does not override social objectives. The study notes that coâoperatives often provide lifelong tenancy rights, enhancing housing security for vulnerable groups such as seniors, lowâincome families and students. In several case studies, coâoperativeâled projects have created mixedâgeneration neighbourhoods that combine affordable rentals with communal amenities, fostering social cohesion.
Challenges and Recommendations
Key obstacles identified are regulatory complexity, limited access to capital for smaller coâoperatives and the need for clearer municipal landâallocation procedures. The authors recommend:
- Establishing dedicated housing coordinators within municipal administrations to streamline coâoperative collaborations.
- Expanding publicâfunded lowâinterest loans and guarantee schemes for coâoperative startâups.
- Standardising cooperationâcontract templates to reduce negotiation time and increase legal certainty.
- Promoting coâoperative participation in earlyâstage urban planning to integrate sustainability criteria from the outset.
Future Outlook for PanâEuropean Audiences
While the study focuses on Germany, its insights are applicable across Europe, where housing affordability and climateâneutral construction are pressing policy goals. The demonstrated capacity of coâoperatives to combine social ownership, longâterm tenancy and environmentally responsible refurbishment positions them as valuable partners for municipalities seeking to meet EU sustainability targets. Scaling these models will require coordinated policy frameworks, access to financing and the sharing of best practices demonstrated in the ten German case studies.

