- ADDON
- Increase
- Append
- Supplemental component
- Extension
- Guac at Chipotle, e.g.
- Firefox extension, e.g.
- Contribute (to)
- Little something extra
- Extra-cost item
- Supplement
- Legislative rider, e.g.
- Relieve a cramping situation, in a way
- Extra charge
- Extra
- Peripheral
- Something attached
- Attachment
- Enhancement
- Aftermarket item
- Bonus
- Rider, e.g.
- Purchase of a Kickstarter backer who pledges above the minimum
- Annex
- Auto option, e.g.
- Building contractor's job
- Scanner, maybe
- Computer accessory
- Accessory
- Webcam, for example
- Attach
- Home builder's afterthought
- Extra, and this puzzle's title
- Garage, perhaps
- Accompaniment
- Not standard
- Optional component
- Extra purchase
- Extra feature
- Something more
- Optional feature
- Bonus feature
- Extra option
- Attach, as a building wing
- Many a toolbar
- Build an annex
- Surcharge, e.g.
- Something extra
- House extension
- Affix
- Extend with
- Aftermarket purchase
- Something costing extra
- Augment with
- Extra-cost purchase
- Provide something extra
- CD burner, e.g.
- Enlarge.
- Knitting instruction.
- Extend
- Write a p.s.
- Lengthen
- Increase stitches
- Architectural afterthought
- Attach an ell
- Suffix
- Bonus item
- Expand
- Building wing
- Codicil, e.g.
- Rider
- Wing
- Write a codicil
- Enlarge a house
- New wing
- Building wing, e.g.
- Enlargement
- Build a new wing, say
- Software plug-in
- Supplementary item
- Supplemental item
- Extension : Chrome :: ___ : Firefox
- New wing, say
- Option
- Cramped handyman's project
- Build a new room
- Enlarge the house, say
- Computer peripheral, e.g.
- Any annex
- Attach at the end
- Browser extension, e.g.
- Expansion
- Software accessory
- Chrome extension, e.g.
- Second story, perhaps
- Enlarge as a room
- Residence afterthought
- Extra device
- Enlarge the house
- Build a new room, say
- Computer peripheral, say
- Build an extra room, say
- Item that doesn't come standard
- Home improvement
- Architect's afterthought
- Home improvement, of a sort
- Build a third bedroom, say
- Like some fees
