Enlarging a ship by jumboisation allows an increase in its value without needing to purchase or build an entirely new ship. This technique has been used on cruise ships and tankers, as well as smaller vessels like sailing or fishing ships.
On large ships, the additional sections are typically 20 to 30 metres long, consisting of an oil tank, a cargo ship hold, or a group of cabins, depending on the type of ship. The tanker Knock Nevis became the largest ship in the world after her jumboisation.
Smaller ships are usually jumboised by replacing the entire bow or stern section of the ship. This is done because the shape of their hull is usually incompatible with the previous method.