What is the difference between a bump-out and a full addition?
Last Updated June 24, 2026
A bump-out extends an existing room by a few feet using the existing foundation. A full addition adds notable square footage with its own foundation, framing, roofline, and systems. Bump-outs are less expensive; full additions are more involved.
Still have questions?
Talk through your project with a Neil Kelly designer — no pressure, no obligation.