This paper studies the impact of increasing minimum contract length on tenant stability and rental market outcomes. We exploit a 2019 reform in Spain that extended rental contracts from three to five years for individual landlords and to seven years for corporate landlords, using the universe of rental agreements in Catalonia (2016–2024) and a regression discontinuity design around the reform date. We find a strong increase in contract length for both landlord types, with no significant effects on rents, contract volume, or short-term contracts for individual landlords, who represent most of the market. Some short-run adjustments appear for corporate landlords, but they are confined to a one-week anticipation period. In the medium run, longer contracts increase tenant stability, driven by fewer renewals with the same tenant among individual landlords and lower market exit among corporate landlords. Overall, extending contract duration enhances tenure security without generating substantial adverse effects on prices or supply.

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