Written with people moving from Turkey in mind. The Portuguese rules still apply more broadly.
Disposing of Large Items (Monstros)
Leaving old furniture or mattresses next to street bins is illegal and carries heavy fines. Instead, every municipality offers a free pickup service for "Monstros" (Monsters/Large Waste).
You simply call your local parish council (Junta de Freguesia) or check their app to schedule a pickup time. They will tell you exactly when to place the item outside your door for collection.