“Projects don’t go wrong, they start wrong”—Masterbuilder heuristic, mentioned in Flyvbjerg, Proj Manag J 55:615–625 (2024) Strategic planning is a critical first step in construction project management—even more so when working in the informal or “unorganised” construction sector. This chapter explores how clear planning and structured project initiation can transform small-scale projects (such as housing, public buildings, and local roads) in both emerging economies and developed contexts. We discuss common challenges in informal construction—from minimal regulations and tight finances to ad-hoc labor—and show practical strategies to address them. Key themes include developing and maintaining a solid project business case, engaging stakeholders, enabling effective decision-making, and tailoring planning processes to fit local conditions. We compare case studies across regions to illustrate lessons learned: for example, how strong upfront planning led to success in some projects, while poor planning caused delays or cost overruns in others. By the end, readers will appreciate how even basic planning steps—setting clear objectives, defining scope, assessing risks—can significantly improve project development processes and outcomes. Whether you are organizing a community build in an emerging economy or initiating a formal project in Australia, strategic planning is the foundation for construction success.