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Given its significant implications for the economy and society, this paper investigates the impact of housing supply regulation on household wealth inequality. Utilizing data from the China Household Finance Survey and land transaction records spanning from 2013 to 2019, we employ recentered influence function regression and two-way fixed effects models to analyze the effect of unexpected housing supply shocks on the wealth gap among households. Our findings reveal that positive unexpected housing supply shocks are crucial in reducing household wealth inequality. This reduction is attributed to the heterogeneous impacts of housing supply regulation on different wealth groups. By deregulating the housing supply, the upward trend in housing prices has slowed, which in turn makes homeownership more accessible and facilitates wealth accumulation for households that fall within the 20 % and 80 % wealth quantiles. Conversely, deregulation has a negative impact on property values for households in the 80–100 % wealth quantile, thus mitigating their overall wealth growth. Overall, this study emphasizes the significant role of housing supply regulation in shaping wealth inequality in China. • This paper examines the housing supply regulation's impact on wealth inequality in China. • Positive housing supply shocks play a vital role in decreasing household wealth inequality. • Deregulation boosts homeownership for 20 %–80 % wealth quantile households. • Wealthiest households face property value drops with deregulation. [ABSTRACT FROM AUTHOR]