Home Addition Cost in Missouri
Updated October 2026 · Based on Missouri contractor data
$36,000
Low Estimate
$72,000
State Average
$129,600
High Estimate
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Total Cost
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Cost per Sq Ft
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Home Addition Costs in Missouri (400 sq ft)
| Addition Type | Cost in MO | Per Sq Ft | National |
|---|---|---|---|
| Bedroom | $41,400 | $104/sqft | $46,000 |
| Bathroom | $79,200 | $198/sqft | $88,000 |
| Garage | $25,200 | $63/sqft | $28,000 |
| Sunroom | $50,400 | $126/sqft | $56,000 |
| Second Story | $104,400 | $261/sqft | $116,000 |
| Adu | $82,800 | $207/sqft | $92,000 |
Home Additions in Missouri
Home addition costs in Missouri run below the national average. Lower contractor rates in Missouri make home additions more affordable than most states.
What's Included in Home Addition Costs
- • Design and architectural drawings: $2,000–$8,000
- • Permits and inspections: $1,350–$4,500
- • Foundation: $4,500–$18,000 depending on type
- • Framing, roofing, exterior: $23–$54/sqft
- • Interior finishes: $36–$108/sqft
Planning Tips
- • Budget 10–20% contingency for unexpected issues
- • Get quotes from at least 3 licensed general contractors
- • Confirm zoning setback requirements before designing
- • Consider financing options: HELOC rates vary by state
Get Free Home Addition Quotes in Missouri
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Get Free Quotes →Frequently Asked Questions
How much does a home addition cost in Missouri?
Home additions in Missouri cost $36,000–$129,600, with an average around $72,000.
How much does it cost to add a bedroom?
Adding a bedroom in Missouri costs $41,400–$57,960 for a typical 400 sq ft room.
Is a home addition worth it?
Home additions typically recoup 50–80% of cost at resale. ADUs offer the best ROI through rental income potential.
How long does a home addition take?
A bedroom/bathroom addition takes 1–3 months. A second-story addition or ADU takes 3–6 months. Include 4–8 weeks for permitting.
What is the cheapest type of home addition?
A garage or sunroom addition is typically cheapest at $25,200–$50,400 for 400 sq ft.