The Shipyard is responsible for constructing all ships and defensive structures. Each level of shipyard opens up the ability to produce new ships and defenses, and increases their production speed (select a ship or defensive unit from the production screen to see its build requirements, or see the Technology Tree for a complete list). Additionally, each level of Nanite Factory will cut the current production time of ships and defenses in half.
Regardless of the Shipyard level, only one defensive structure or ship can be constructed at a time. As with building construction, there is a build queue in the Shipyard that allows you to queue up building of defenses and ships. However, there are three VERY important differences:
In other words, once you place an order with the Shipyard for ships or defenses, it is permanent. No refunds allowed! And because there is no limit on the size of the Shipyard build queue, be very careful about the numbers you enter. You may accidentally build more than intended and there is no way to correct the error. When you are under attack, adding resources to the Shipyard build queue is one way to prevent them from being plundered.