The oak door can be built in the Door space of the Dungeon and Treasure Room in a player-owned house. It requires 74 Construction to build and when built, it gives 600 experience. The player must have a hammer and a saw in their inventory to build it.
They are the weakest of the three tiers of dungeon doors. As with all dungeon doors, they can be either forced open or have the lock picked to be opened. The success rate of these actions are determined by the player's Strength and Thieving levels.
Oak doors are often used as an alternative method of training Construction since you can have a Butler deliver 20 oak planks around the time the player finishes building both of them. This method is around 350-360k experience an hour. With the demon butler delivering 20 oak planks and being able to build two doors in the time the demon butler returns experience rates of 500k experience an hour can be reached.