The projects funded using National Government Constituency Developed Fund in Kenya faces, time and cost overruns as well as quality issues which prompted this study to investigate the extent to which social audit has been conducted among government funded projects, and its effect on the performance taking a case of Mandera county. A descriptive approach was taken and the data was collected through semi-structured questionnaire. The study targeted 88 respondents who comprised of National Government Constituency Developed Fund committee members, wards representatives, heads of departments such as education, works, water, health, finance and audit in the sub county as well as the beneficiaries of the projects. The data analysis procedure was thematic, descriptive and inferential statistics. In this case, mean, standard deviation and regressions were used. The study found out that social accountability had a positive and significant effect on performance of NGCDF projects in Mandera county; participatory budgeting had a positive and significant effect on performance of NGCDF projects in Mandera county and community-based monitoring of NGCDF projects was also positively and significantly associated with the performance of NGCDF projects in Mandera county.