The Netherlands is facing a significant housing shortage, with a target of 900.000 new homes by 2030. Bouwstromen have emerged as a promising response to accelerate delivery and improve affordability. However, the organizational and collaborative dynamics within Bouwstromen are not well understood. This thesis examines three active Bouwstromen: WoonST 2.0, NH Bouwstroom and Bouwstroom Haaglanden. Through a comparative case study based on interviews with key actors and project documentation, the research explores how Bouwstromen reshape actor roles, collaboration and governance in urban development. In-depth interviews and qualitative coding are applied to analyze these shifts among involved parties. Findings show that Bouwstromen transform traditional roles: housing associations evolve into coordinators of mutli-year projects within a portfolio; municipalities shift to strategic collaborators and builders step into a reactive product developers role. Early alignment and trust foster ‘no-relearning’ efficiencies and facilitate standardization at scale. Yet, challenges remain in aligning municipal processes, clarifying responsibilities and balancing standardization with site-specific flexibility. This study contributes to the understanding of programmatic housing delivery by linking governance structures to collaboration and IC method adoption. The insights provide a basis for improving permit procedures, strengthening partnerships and supporting scalable housing solutions within the Dutch urban context.