Ask Bob Renovations What is the difference between an addition and a bump-out?
Back to Renovations

What is the difference between an addition and a bump-out?

A bump-out extends an existing room by a few feet, typically using the existing roofline and foundation. It is smaller in scale and costs $100 to $200 per square foot. A full addition involves extending the foundation, new roofing, and tying into the existing structure. Additions can be any size and cost $150 to $300 per square foot. A bump-out is the more affordable option for gaining modest space.

Why It Matters

Choosing between a bump-out and a full addition affects your budget, timeline, permits, and how much space you gain.

Related Questions

What renovations add the most value? Should I hire a general contractor or manage the project myself? How do I find a trusted contractor for my renovation? How do I budget for a home renovation? Do I need permits for a remodel in New Jersey?

Still Need Help?

Bob answers every question personally. Send your question directly to him.

Ask Bob Directly