The rental market in Castellón is facing growing tensions, with a 36% decrease in housing supply over the last three years, according to a report by Idealista. Concurrently, demand has surged, with approximately 56 interested parties for each available property, a situation surpassing the national average.

This combination has led to a sustained increase in rental prices, which have risen by 34% compared to 2023. Castellón's figures are above the Spanish average, where the price increase is around 30.7% and competition stands at 41 interested parties per property. The national supply reduction has been 30%.

The province of Castellón also reflects this upward trend. The INE's Rental Housing Price Index indicates an accumulated increase of 22% between 2015 and 2024, with a notable acceleration from 2021 onwards. New contracts have risen by 22.8%, while existing leases have increased by 9.4%.

During the first months of 2025 and 2026, the province has seen a 5.1% price increase. In the capital, room rentals have surged; supply has fallen by 24%, but competition has soared by 124%, with prices nearing 300 euros per room.

Despite rising prices, Castellón remains a profitable market for rental investment, with more competitive prices than other major cities. Industry sources highlight investor interest in properties below 100,000 euros, although the resulting supply is still insufficient to meet growing demand.