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This study investigates adaptive reuse as a sustainable strategy to address environmental, economic, and social challenges in urban development. Through the analysis of existing buildings in Långmyran, the research explores how architectural adaptability can prolong building life cycles, preserve cultural heritage, and reduce carbon emissions.

A core principle examined is polyvalence, introduced by Herman Hertzberger, which allows structures to transition fluidly between residential and commercial functions. Historical plans of Långmyran 17, 18, and 19 illustrate how buildings evolve unpredictably over time, reinforcing Stewart Brand’s statement: “All buildings are predictions. All predictions are wrong.”

The study incorporates findings from Life Cycle Assessments (LCA), Boverket, and CIRCuIT, highlighting the high climate impact of foundations and structural systems. Comparisons between renovation strategies and new construction confirm that refurbishment significantly outperforms demolition in terms of carbon reduction. Additionally, concerns regarding raw material depletion, particularly the extraction of sand for concrete production, further emphasize the urgency of circular construction models.

Beyond sustainability, the study examines social and economic implications, showing how rising property values and the shift from rental apartments to condominiums affect housing accessibility. The interventions proposed in Laboratory A and B demonstrate how existing buildings can be optimized for increased density and adaptability, ensuring long-term relevance in urban environments. Ultimately, this research argues that preservation and innovation must coexist, advocating for adaptive reuse as a viable alternative to demolition in future urban planning.