English：

Construction robotics represents a pivotal driver for the intelligent transformation of the building industry. However, indoor spraypainting robots have rarely been deployed in smallunit residential projects, and the corresponding construction knowhow is scarce, severely limiting their broader adoption. Taking the Shahu Affordable Rental Housing Project in Pingshan, Shenzhen as a case study, this paper evaluates the performance of an indoor spraypainting robot under various apartment layouts. The findings are as follows. Among the three layouts—A1, B1 and C1—in the smallunit project, the robot achieved the highest working efficiency and quality in the B1, whose robotaccessible workspace is rectangular, and material savings were also greatest in this layout. The larger the proportion of continuous wall surfaces within the robotaccessible zone, the higher the robot’s productivity. Nevertheless, the robot delivered relatively poor finish quality on ALC (autoclaved lightweight concrete) walls that required no plastering. Given that the robot’s finish quality is highly sensitive to substrate conditions and its maneuverability is limited, it is recommended that, to guarantee final quality, the first coat of putty and the topcoat application be executed manually, while the second putty coat and the primer on large wall surfaces be performed by the robot.