Piers, footings etc. with slabs/walls/roofs/column tool, basically any tool that lets you produce a rectangular prism, although depending on construction (eg cavity fill) some tools may be more appropriate/easier to use.
Ant caps to piers - create half ant cap outline fill and create complex profile (see attached drawing) and insert with wall or beam tool on rectangular or rotated rectangular mode, although doing this once and then saving the resultant object as a library part for multiple insertion into project would be preferable i think if you had many to do.
Of course, for ant cap to walls just use the above complex profile in required lengths.