Room addition cost
Short answer
A room addition costs about $25,000–$75,000 nationally (typically $50,000). Costs run 15–35% higher in the Northeast and West, and lower in the South. Pick your state for a localized range.
National range
$25,000–$75,000
Typical
$50,000
Room addition cost by state
| State | Estimated cost |
|---|---|
| CA | $32,000–$96,000 |
| TX | $23,300–$69,800 |
| NY | $31,300–$93,800 |
| FL | $24,500–$73,500 |
| IL | $26,300–$78,800 |
| GA | $23,000–$69,000 |
Your state & scope
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Frequently asked questions
How much does a room addition cost?
About $25,000–$75,000 nationally for a mid-range room addition (bump-out to full room, per project), typically around $50,000. Your state and finish level move it.
Why does a room addition cost more in some states?
Labor and materials vary by region. The same room addition runs about $32,000–$96,000 in California versus $23,300–$69,800 in Texas. Pick your state in the calculator.
How can I save on a room addition?
Choose a budget finish tier, get at least three itemized bids, keep the existing layout to avoid moving plumbing or walls, and schedule in the off-season. The calculator's budget tier shows the lower end.
51 states supported.