The issue of indiscriminate urban expansion is not uncommon in Africa. It has created haphazard, unplanned, and unapproved development that negatively affected urban planning for cities in the Niger Delta Region in Nigeria. Using Stone's urban regime theory, the purpose of this phenomenological study was to explore from the perspective of developers, associations, and government agencies (referred to as stakeholders), the roots causes of indiscriminate urban development and their activities in the process in the Niger Delta Region. Data were collected through semi structured telephone interviews with 10 participants who had at least 5 years experience working in public and private organizations in the urban setting. Interviews were transcribed, coded, and analyzed using Braun and Clarke's procedure for thematic analysis. Findings included six themes of limited knowledge, passive role, recognition of experiencing the problem, contributing to the problem, weakness of regulatory framework, and lack of synergy in the process. The principal theme was limited knowledge of the roles and obligations of participants which impede participation in the planning process. The recommendations, if implemented, may result in positive changes and bring many benefits to city residents such as better housing and traffic systems, adequate sanitation and improved access to public services. To do so, government agencies in the urban sector should engage the stakeholders to create synergy. Following these recommendations may help resolve the issue of indiscriminate urban expansion, promote effective planning and management, and ensure good governance and sustainable development in the urban setting.