Can UK citizens still buy property in Spain after Brexit?
Yes - and the answer is straightforward. UK nationals can purchase property in Spain freely. There are no nationality restrictions on who can own real estate in Spain. Brexit has not changed the right to buy; what it has changed is your right to stay.
As a non-EU national, you are now subject to the Schengen 90/180-day rule: you can spend a maximum of 90 days in any 180-day period in the Schengen Area without a visa. That affects how you use the property, not whether you can own it. If you want to live in Spain for longer - or retire there - you will need a Spanish visa or residency permit.
The most relevant visa options for British buyers are the Non-Lucrative Residency visa (for those with sufficient passive income or savings), the digital nomad visa (for remote workers), and the standard work visa. Spain's Golden Visa also exists, but requires a minimum €500,000 property investment and has been targeted for abolition - verify its current status with a specialist before relying on it.