This study investigates the implementation of Project Quality Management Plan (PQMP) in building projects in Rivers State, Nigeria. The construction industry plays a vital role in the economic development of the region, with a large proportion of the workforce engaged in construction-related activities. The Quality Management Plan (QMP) is crucial in ensuring that projects meet established standards of time, cost, and quality. The study aims to evaluate the application of QMP documents in the construction sector of Rivers State, identifying key factors affecting their successful implementation. Data were collected through a survey of built environment professionals, using attendance registers from various professional institutes in the state to derive the sample size based on Taro Yamane’s method. Random sampling was used to select the respondents. The findings reveal that poor planning, political interference, and the use of unskilled contractors are the most significant factors impeding the effective application of PQMP, with Relative Importance Index Values of 0.807, 0.794, and 0.776, respectively. The study highlights the importance of proper planning, the involvement of skilled contractors, and the strict adherence to government policies for building approvals to improve the application of PQMP in the state. The research concludes that enhancing the implementation of PQMP is essential for improving the quality and sustainability of building projects in Rivers State.