★ Key Takeaways
The Average Room or House Addition Costs $86 to $208 per Square Foot, with Most Homeowners Spending Between $22,500 and $74,000. Adding a 20×20 Family Room Costs $48,000 on Average, While Adding a 12×12 Bedroom Costs About $17,300. the Cost to Add a Bathroom Starts at $18,000.
Are how Much Does It Cost to Add More Rooms to a House a question on your mind? Read expert analysis in our feature story.
The Average Room or House Addition Costs $86 to $208 per Square Foot, with Most Homeowners Spending Between $22,500 and $74,000. Adding a 20×20 Family Room Costs $48,000 on Average, While Adding a 12×12 Bedroom Costs About $17,300. the Cost to Add a Bathroom Starts at $18,000.
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