Related Clues:
- To be or not to be, e.g.
- Home builder's afterthought
- Expansion
- Possibility
- Call, for example
- Garage, perhaps
- Building wing, e.g.
- Extra, and this puzzle's title
- Include as a bonus
- Build an annex
- Extra cup holders, for one
- Enlargement
- The choice of taking or leaving
- Altenative choice
- Choice or selection