A Barrows Portal can be built in the portal chamber of a player-owned house. It will teleport players to the Barrows.
Barrows - The RuneScape Wiki
Portal (Player-owned house) - OSRS Wiki
Teleportation, Old School RuneScape Wiki
User: Sneaky undead fowl - OSRS Wiki
Crystalline portal nexus - OSRS Wiki
Barrows Teleport - OSRS Wiki
Annakarl Portal - OSRS Wiki
Player-owned house, RuneScape Wiki
Carrallanger Portal - OSRS Wiki