Abstract A sustainable refurbishment is a fundamental approach toward reaching the EU’s climate goals. Some challenges to rehabilitating existing housing areas are few high-quality standards, lack of funding, and low residential interest. This paper aims to present the findings from the development of a SAS – Sustainable Accounting Standard tool from different stakeholders’ perspectives and information from the testing period. A triangulating combination of literature review, survey, and interview are chosen. The literature review forms a theoretical basis within the field. Experiences with the SAS tool are retrieved through semi-structured in-depth interviews with project participants from co-operative housing associations and a survey for residential board members from selected pilot projects. The SAS tool forms an improved process for sustainable development in housing co-operatives, addressing all aspects of sustainability, early involvement of stakeholders, and the importance of residents’ participation. The project shows that the equal involvement of stakeholders is essential to reaching the goal and that commitment, trust, communication, and knowledge sharing are the basis. The established KPIs are good indicators for condition analysis and ambition plans. The SAS tool can contribute to a smoother refurbishment process with proper prioritization of improved measures.