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Each team has a selection of buildables (also known as "structures") that can be built. Upon Stage advancement, new buildings will become available to the team. Humans build with the Construction Kit or the Advanced Construction Kit. Aliens build as the Granger or Advanced Granger Class. The number of structures is limited to the amount of Build Points (Humans) or Sentience (Aliens) the team has.
Structures can be broken up into four categories;
Energy: Aliens - Overmind | Humans - Reactor
Spawn: Aliens - Egg | Humans - Telenode
Defence: Aliens - Acid Tube, Hive | Humans - Machinegun Turret, Tesla Generator
Support: Aliens - Barricade, Booster | Humans - Armoury, Medistation, Defence Control Computer
See Alien Buildables and Human Buildables for a list of structures.
On how to build, see Building, Human Building and Alien Building.