Background: The activity concentrations of ²²⁶Ra, ²³²Th and ⁴⁰K in sand used as building material in Weifang of China were investigated for evaluating the radiation hazard. Materials and Methods: Sand samples were collected from Weifang and their radioactivity levels were measured using gamma-ray spectrometry. The radiation hazard for residents was assessed by radium equivalent activity (Ra_eq), indoor air absorbed dose rate (D), annual effective dose (AED) and excess lifetime cancer risk (ELCR). Results: The activity concentrations of ²²⁶Ra, ²³²Th and ⁴⁰K ranged from 11.7 to 23.0, 33.6 to 126.1 and 353.2 to 924.8 Bq kg⁻¹ with averages of 15.5, 70.3 and 802.9 Bq kg^-1, respectively. All Ra_eq values were lower than the limit of 370 Bq kg^-1. The mean value of D was higher than the world population-weighted average of 84 nGy h^-1, while the mean AED and ELCR values were below the internationally accepted values. Conclusions: The use of sand in construction of dwellings is considered to be safe for inhabitants.