Different examples explain challenges faced by construction projects in Rwanda along with their development also known to cause projects’ low quality and overruns. This study aimed at assessing the critical factors affecting the performance of construction projects in Rwanda considering the case of Rubavu Modern market. A cross sectional research design (a non-experimental descriptive survey)considered both the stratified and simple random sampling techniques was applied to sample the targeted populationincluding engineers, consultants, project planners’ team and contractors among others. Pre-tested, structured questionnaire were used for data collection and distributed among the target population. These quantitative data were analyzed using the univariate and bivariate analyses in the statistical package for social sciences (SPSS V.20). The results exhibited a positive and a very high correlation between consultants, designer’s factors and construction project of the Rubavu modern market construction project with a Pearson correlation equivalent to .658**. The results also revealed a very high correlation between contractors’ factors and the Rubavu modern market construction project with a Pearson correlation equivalent to .839**. Furthermore, the findings confirmed a very strong correlation between technical equipment and material factors and construction project with a Pearson correlation equivalent to .777**. Lastly,findings confirmed the significant relationship between contract management factors and Rubavu modern market construction project with a Pearson correlation value equal to .571**. However, there is a need to strengthen construction and post-constructive phase in numerous trainings to the concern stakeholders in the project to avoid any risk of construction failure or delays. The stakeholders should have the duties like management skills in the site and use them effectively to reach on project goals, {"references":["Alhajri, A. R., & Alshibani, A. (2018). Critical factors behind construction delay in petrochemical projects in Saudi Arabia. Energies, 11(7), 1652","Amade, B. (2015). FACTORS FOR CONTAINING FAILURE AND ABANDONMENT OF PUBLIC SECTOR CONSTRUCTION PROJECTS IN NIGERIA. journal for building performance, 6(1), 63","] Amade, B., Ubani, E. C., Omajeh, E. O.-M., & Njoku, U. (2015). Critical success factors for public sector construction project delivery: A case of Owerri, Imo State. International Journal of Research in Management, Science & Technology, 3(1), 11-21","Behuria, P., & Goodfellow, T. (2016). The political settlement and 'deals environment'in Rwanda: Unpacking two decades of economic growth. Effective States and Inclusive Development Working Paper(57).","Blundell, R., & Costa Dias, M. (2000). Evaluation methods for non‐ experimental data. Fiscal studies, 21(4), 427-468","Chan, A. P., & Chan, A. P. (2004). Key performance indicators for measuring construction success. Benchmarking: an international journal","Chan, W. K., Suhaiza, Z., & Yudi, F. (2009). Critical factors influencing the project success amongst manufacturing companies in Malaysia. African journal of business management, 3(1), 016-027.","Dissanayaka, S. M., & Kumaraswamy, M. M. (1999). Evaluation of factors affecting time and cost performance in Hong Kong building projects. Engineering, Construction and Architectural Management"]}