Why is politics dominated by wealthy men, and how do gendered and class barriers to running for office intersect? This article addresses these questions using the UK as a case study. Drawing on interview data, I highlight the formal and informal institutions that shape the class and glass ceilings in electoral politics. I identify how the high personal costs of running for office, especially in relation to candidates’ time, present a barrier to those without significant financial resources. These costs are gendered, as women typically have less time and money than men. These resource barriers are compounded by additional gendered obstacles including discrimination, abuse and gendered family roles. I find that the intersection of the class and glass ceilings creates cumulative barriers that are particularly prohibitive for working-class women. The findings extend our understanding of class and gender gaps within politics and, crucially, the intersection between them.