This research report, "Générations 1,5°C," assesses the financial viability of sustainable building practices in Quebec. The study uses a case study of an existing residential building, modeling energy and financial performance for both the existing structure and two sustainable alternatives. The analysis demonstrates that while upfront costs are higher for sustainable buildings, long-term financial benefits outweigh these initial expenses due to reduced operating costs and enhanced market value. The report incorporates perspectives from various industry partners and quantifies both operational and embodied carbon emissions. The findings emphasize the importance of considering environmental factors for responsible real estate investment.