Three months if the ground is that the decision seriously harms the community or unfairly harms one owner, and one year if the ground is that it breaks the law or the statutes. An owner who was not at the meeting counts the window from the day the decision was communicated to them, not from the day of the meeting. To challenge, you generally have to be up to date with community payments or have paid the disputed amount into court first.
Where this comes from: art. 18.3 Ley 49/1960 (LPH), BOE consolidated text, read 2026-09-10; art. 18.3 Ley 49/1960 (LPH), with art. 9, BOE consolidated text, read 2026-09-10; art. 18.2 Ley 49/1960 (LPH), BOE consolidated text, read 2026-09-10.