Spain's platform short-let inventory fell about 47,000 dwellings in a year to 329,764, a 12.4% drop measured by INE (Spain's national statistics institute) at November 2025 and the largest annual fall in its series 1. Roughly 52,000 listings came off the platforms in the six months to November 2025, as the Unique Registration Number requirement (a single national licence code that every legal short-let must display) and a Horizontal Property Law reform letting residents' committees veto new lets both bit at once. This is the first hard evidence that a major European short-let crackdown measurably compresses supply.
Supply decides where a remote worker can rent long-term: every flat pulled from the tourist platforms is one that can return to the residential market. The wider package sits behind the figure, from Valencia's 2% cap on tourist stock in pressured zones, set against record foreclosures , to Madrid rents still up 17.9% year-on-year . Spain has shown the lever works at scale.
Then the Tribunal Supremo (Spain's Supreme Court) pulled part of it out. Its ruling, STS 620/2026 (Supreme Court judgment 620 of 2026), voided the national registration number on federalism grounds , the very instrument that drove much of the compliance wave. The Ministry of Housing says the listing-accuracy duties the enforcement rests on survive the ruling, while Airbnb's pending reconsideration motion against its 64-million-euro fine now uses the judgment as a competence defence.
The drop may not be regulation alone. Part of it reflects a methodology change, since TripAdvisor Left the data panel, and the post-ruling legal uncertainty could reverse the trend before it consolidates. The next INE snapshot, due around November 2026, will be the clean read on whether the compliance wave held once its central tool was gone.
