Editing Shipyard (section)

===Expansion===
Shipyards industrial capacity can be improved by expansion of the capacity of slipways, increasing the maximum construction tonnage of ships they can handle; or by producing more slipways, increasing the number of ships that the shipyard can build concurrently. 

It is important to note though that shipyards don't gain much benefit from constructing ships smaller than their maximum tonnage, so don't expand your shipyards gratuitously unless you have resources to spare. Also, it rapidly becomes more expensive and takes increasing lengths of time to modify a shipyard as its number of slipways increase. Use 1-slip shipyards for ships you won't build many of, and reserve multiple-slipway yards for major classes you are building a number of. In [[VB6]], you also cannot start new ship construction at a shipyard that is retooling to another class, so plan your shipyard retooling carefully to avoid unusable construction slips.

Expansions can be done in discrete steps, or by using the Continual Capacity Upgrade order. Continual upgrades are always slightly faster (since the yard's self-modification speed increases as it grows), and in c#, you can tell the yard when to stop growing. In VB6, the yard will keep expanding indefinitely, which may be an issue if you don't keep an eye on it.