A study was conducted at the construction site of Laman Granview, Saujana Puchong, Selangor to study the stability of two slopes and the geomechanical properties of the rock mass. The study site is part of the Kenny Hill Formation. Surveys were carried out at two cut slopes at construction site were discontinuity surveys and rock mechanics characterisation. Quartzite is the dominant lithology in this area with minor amounts of phyllite. The following rock mechanics tests were conducted: Uniaxial compressive test, point load index test, Brazilian tensile strength test, Schmidt rebound hammer test and Shore Scleroscope test. Tilt tests for determining the surface roughness of discontinuities were conducted on rock block. The results of discontinuities survey showed that there are four major sets of discontinuities at cut slope L1 with dip directions/dip values of 62°/42°, 261°/79°, 281°/59° and 237°/71°. At cut slope L2, there are three major discontinuities sets with dip direction/dip values of 81°/41°, 171°/71° and 198°/60°. For the tilt test results, the average peak friction angle (fp) of the discontinuity surface for quartzite with Joint Roughness Coefficient (JRC) 8-10 is 61°. Discontinuity planes of quartzite with JRC of 10-12 have an average peak friction angel (fp) value of 73°, while phyllite with JRC 4-6 has an average peak friction angle (fp) value of 56°. Based on kinematic slope stability analysis, cut slope L1 is stable. Potential failure for cut slope L2 is plane failure but the high friction angle of the discontinuity surface will prevent failure. The Rock Mass Rating (RMR) obtained for quartzite is 77 and phyllite is 66 which both of which are classify as good rock mass in class II. © 2019 Penerbit Universiti Kebangsaan Malaysia. All rights reserved.