GalCiv 3 Crusade:
It's possible to avoid the administrator cost for building starbases by designing constructors with multiple construction points and 'upgrading' the ship back to the original design after building a starbase and losing one construction point. The upgrade considers the adminstrator cost for building the original ship rather than the administrators left as indicated by the remaining construction points.
This means lost construction points can be restored without administrator cost as long as the ship is still there (i. e. has 1 CP left).
I doubt this is working as intended, although of course this method still requires time and money for upgrading after every construction.