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

By Bob Millaway, South Jersey Community Expert & REALTOR®

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.

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