Helsingborg is using its Oceanhamnen innovation district to test climate- neutral construction. Through COBUILD NETZERO, the city is co-developing carbon calculation tools, standards, and procurement methods with developers, contractors, and municipal departments to cut construction emissions by 50% by 2030. In Year 1, the project was embedded in Helsingborg’s Climate and Energy Plan 2025–2030, which added a dedicated chapter on building and construction. Lund University established a carbon baseline for existing development, a 20-person Change Agent Learning Programme built technical and leadership capacity, and draft carbon limits were tested with 16 developers and contractors to prepare for formal adoption.