Home addition cost in Missouri
Statewide estimate from BLS wages and BEA prices. Reviewed Nov 4, 2026.
- Statewide range (300 sq ft)
- $37,800 – $76,500
- Per sq ft
- $125 – $249
- before permit
- Versus US midpoint
- −1%
- US $57,500
- Metros covered
- 6
Across Missouri, a home addition costs about $37,800 to $76,500 for 300 sq ft. Statewide, that midpoint is 1% below the US figure of $57,500. Carpenters earn a median $29.25 an hour in Missouri (US: $29.12).
Inside Missouri, the metros we cover range from $51,900 (Joplin) to $63,200 (St. Louis) at the midpoint. Pick your closest city in the table for a tighter number.
Estimate your home addition cost
Pick a size, a quality level and where you live. Prices update as you type.
Estimated cost for 300 sq ft in Missouri (statewide), standard level
$49,400 to $64,900
About $162 to $212 per sq ft before permits. Labor is about 68% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $15,000 | $19,600 |
| Labor | $33,500 | $43,900 |
| Permits and fees | $860 | $1,400 |
| Total | $49,400 | $64,900 |
Cost breakdown for 300 sq ft in Missouri
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $11,600 | $17,300 | $23,100 | 30% |
| Labor | $25,800 | $38,700 | $51,600 | 68% |
| Permits and fees | $450 | $1,150 | $1,800 | 2% |
| Total | $37,800 | $57,200 | $76,500 | 100% |
What carpenters and the other trades earn in Missouri
Statewide wages come from BLS's state-level estimates, which blend big cities with small towns and rural areas. 6 trades drive the labor line for this job, and the weighted ratio against the national wage level is 1.01 for Missouri.
For carpenters (47-2031, weighted 50%) the local median is $29.25 an hour, which is in line with the national $29.12. The middle half of them earn between $22.85 and $38.74 an hour. BLS counts 14,410 of them working in the state, 49.1 for every 10,000 jobs (US: 43.1), so the local bench is about average.
For cement masons and concrete finishers (47-2051, weighted 10%) the local median is $29.51 an hour, which is 8% above the national $27.41. The middle half of them earn between $23.25 and $35.27 an hour. BLS counts 6,220 of them working in the state, 21.2 for every 10,000 jobs (US: 13.3), so the local bench is deeper than average.
Electricians (47-2111), 10% of the weighting: a median of $31.45 an hour, 4% above the US median of $30.38. The middle half of them earn between $23.95 and $45.08 an hour. About 12,780 work in the state. That is 43.5 per 10,000 jobs, compared with 48.7 nationally, so the supply of crews looks typical.
For plumbers, pipefitters and steamfitters (47-2152, weighted 10%) the local median is $32.11 an hour, which is 5% above the national $30.67. The middle half of them earn between $24.35 and $48.19 an hour. BLS counts 8,310 of them working in the state, 28.3 for every 10,000 jobs (US: 30.0), so the local bench is about average.
Drywall and ceiling tile installers (47-2081), 10% of the weighting: a median of $30.09 an hour, 6% above the US median of $28.33. The middle half of them earn between $25.36 and $38.74 an hour. About 550 work in the state. That is 1.9 per 10,000 jobs, compared with 5.3 nationally, so expect fewer local crews to bid.
For roofers (47-2181, weighted 10%) the local median is $23.35 an hour, which is 12% below the national $26.65. The middle half of them earn between $20.55 and $31.11 an hour. BLS counts 2,050 of them working in the state, 7.0 for every 10,000 jobs (US: 8.7), so the local bench is thinner than average.
A crew paid at the 75th percentile for carpenters ($38.74 an hour) would add about $6,250 to the statewide midpoint; one at the 25th percentile ($22.85) would take off about $4,200. Use that as a rough guide to how far a bid can sit from our midpoint on wages alone.
BLS counts 2,936,050 jobs across Missouri (May 2025), which is 1.9% of US employment.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Carpenters (47-2031) | 50% | $22.85 | $29.25 | $38.74 | $29.12 | 1.00 | state |
| Cement masons and concrete finishers (47-2051) | 10% | $23.25 | $29.51 | $35.27 | $27.41 | 1.08 | state |
| Electricians (47-2111) | 10% | $23.95 | $31.45 | $45.08 | $30.38 | 1.04 | state |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $24.35 | $32.11 | $48.19 | $30.67 | 1.05 | state |
| Drywall and ceiling tile installers (47-2081) | 10% | $25.36 | $30.09 | $38.74 | $28.33 | 1.06 | state |
| Roofers (47-2181) | 10% | $20.55 | $23.35 | $31.11 | $26.65 | 0.88 | state |
| Blended | 100% | 1.01 | |||||
How Missouri compares with nearby states
Missouri ranks 25 of 51 (the 50 states plus DC) for home addition, where 1 is the most expensive. The costliest is Hawaii at $76,300 and the cheapest Arkansas at $48,200, both for 300 sq ft at the midpoint. Missouri sits at $57,200. The five states closest by workforce center are listed below.
| State | Distance | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Iowa | 220 miles away | $35,900 – $72,700 | $54,300 | −5% |
| Arkansas | 230 miles away | $31,800 – $64,500 | $48,200 | −16% |
| Kansas | 250 miles away | $35,200 – $71,300 | $53,300 | −7% |
| Nebraska | 270 miles away | $33,700 – $68,300 | $51,000 | −11% |
| Illinois | 310 miles away | $47,400 – $95,800 | $71,600 | +25% |
Weather windows across Missouri
Season matters for home addition. For each Missouri metro below we took NOAA's 1991-2020 monthly normals from the nearest suitable station and counted comfortable months for digging and ground work.
Springfield has the longest comfortable season of the metros we cover in Missouri at 9 months (March through November); Joplin has the shortest at 7 (March through June and September through November). Rainfall runs from 38 inches a year in Kansas City to 47 inches in Springfield.
We do not adjust prices by month, because we have no reliable published data on seasonal pricing. Timing is still worth raising when you collect bids.
| Metro | Jan avg low °F | Jul avg high °F | Precip (in/yr) | Comfortable months |
|---|---|---|---|---|
| St. Louis | 25 | 90 | 44 | 8: March through June and August through November |
| Kansas City | 22 | 90 | 38 | 8: March through June and August through November |
| Springfield | 23 | 88 | 47 | 9: March through November |
| Columbia | 23 | 89 | 45 | 9: March through November |
| Joplin | 25 | 90 | 46 | 7: March through June and September through November |
| Jefferson City | 23 | 89 | 40 | 9: March through November |
Missouri metro-by-metro prices
2 of the 6 metros sit above the statewide midpoint of $57,200, and the top-to-bottom gap is 22%. Each row prices the default size with that metro's own BLS wages and BEA price levels, so the gap between rows is real local variation rather than a flat markup.
| Metro | Range (300 sq ft) | Midpoint | vs. state |
|---|---|---|---|
| St. Louis, MO | $41,800 – $84,600 | $63,200 | +11% |
| Kansas City, MO | $38,400 – $77,700 | $58,100 | +2% |
| Jefferson City, MO | $36,500 – $73,900 | $55,200 | −3% |
| Columbia, MO | $35,900 – $72,600 | $54,200 | −5% |
| Springfield, MO | $34,700 – $70,200 | $52,400 | −8% |
| Joplin, MO | $34,300 – $69,400 | $51,900 | −9% |
Home addition: what moves the price in Missouri
Type of addition
A new room is $125-$250 per sq ft; a bump-out $85-$200; an attic conversion $50-$150; a garage conversion $50-$200 (HomeGuide).
Plumbing and fixtures
Adding a bathroom or kitchen drives the price up the most.
Permits
Construction permits run $500-$2,000, or $5-$21 per $1,000 of project cost (HomeGuide).
Foundation
A foundation, framing, roofing and matching exterior finishes all have to be built before the interior work starts.
Other Missouri jobs that often go with home addition
The table prices neighboring jobs at their usual sizes using statewide Missouri wages and prices. Against national midpoints, bathroom remodel comes out highest (+1%) and roof replacement lowest (−6%), because each job leans on different trades.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $18,100 – $30,700 | −2% |
| Bathroom remodel | 45 sq ft | $4,750 – $23,600 | +1% |
| Detached garage | 576 sq ft | $29,100 – $58,300 | level |
| Roof replacement | 2,000 sq ft of roof | $5,700 – $11,700 | −6% |
Quality levels and sizes in Missouri
The cited range is cut into three overlapping bands (basic, standard and premium) and scaled to statewide Missouri wages and prices. The grid prices the same bands at 3 common sizes.
Basic
$37,800 to $53,300
Bump-out or simple room without plumbing
Standard
$49,400 to $64,900
Standard room addition with HVAC and electrical
Premium
$61,000 to $76,500
Large addition with bath or kitchen and a new foundation
| Size | Basic | Standard | Premium |
|---|---|---|---|
| bump-out (100 sq ft) | $12,900 – $18,400 | $17,100 – $22,600 | $21,200 – $26,700 |
| 20x20 room (400 sq ft) | $50,300 – $70,700 | $65,600 – $86,100 | $81,000 – $101,500 |
| large suite (600 sq ft) | $75,200 – $105,500 | $98,000 – $128,500 | $121,000 – $151,500 |
Get 3 local quotes
Tell us about the job and we will try to connect you with up to three local contractors for written quotes. It is free and you are under no obligation to hire. Your estimate of $49,400 to $64,900 for Missouri is attached.
Detailed home addition report for Missouri, $9
Multi-page report for Missouri: low, typical and high cost, a line-item breakdown of materials and labor by trade, permit notes, the best months to schedule, a quote comparison sheet, red flags, questions for contractors, checklists and every source. Save your estimate above, preview page 1 free, and unlock the full report for $9 one-time, or get every report with CostLocal Pro.
Home addition in Missouri: your questions
+How much does it cost to build a home addition in Missouri?
$37,800 to $76,500 for 300 sq ft, using statewide wages and prices. Metro areas inside Missouri can sit above or below that.
+Which city in Missouri is cheapest for home addition?
Joplin at about $51,900 (midpoint, 300 sq ft). The priciest is St. Louis at $63,200.
+Is home addition cheaper in Missouri than the US average?
It is 1% cheaper: $57,200 against $57,500 for 300 sq ft at the midpoint.
+What share of the price is labor in Missouri?
About 68% ($38,700). Materials are 30%. Statewide labor for this job is weighted 1.01x the national wage level.
+What do carpenters earn in Missouri?
The BLS statewide median is $29.25 an hour, against $29.12 for the US. The 25th to 75th percentile range is $22.85 to $38.74.
+Where does Missouri rank for home addition costs?
25th most expensive of 51 (the 50 states plus DC) at the midpoint, $57,200 for 300 sq ft. Rank 1 is the costliest.
+What do basic and premium home addition work cost in Missouri?
For 300 sq ft, basic work runs $37,800 to $53,300 and premium work $61,000 to $76,500. Basic means: bump-out or simple room without plumbing. Premium means: large addition with bath or kitchen and a new foundation.
+Does the season matter for home addition in Missouri?
Yes where winters or summers are hard. Of the Missouri metros we cover, Springfield has the most comfortable months (9 of 12) based on NOAA 1991-2020 normals. Our prices do not change by month, so ask contractors whether they charge more or less in busy and slow seasons.
Home addition by city in Missouri
Where these numbers come from
Base prices are national ranges from the sources below. We scale labor by local BLS wages, materials by BEA goods prices and permits by the BEA all-items price level. Full method on the methodology page.
- HomeGuide: How Much Does a Home Addition Cost? (2026) (accessed November 4, 2026)
- Cost to Renovate: Renovation Labor Report 2026: Where the Money Goes (accessed November 4, 2026)
- HomeGuide: 2026 Building Permit Costs | Fees & Cost Calculator (accessed November 4, 2026)
- BLS Occupational Employment and Wage Statistics, May 2025
- BEA Regional Price Parities, 2024
- NOAA NCEI U.S. Climate Normals, 1991-2020
Note on derived figures: Materials = 32% of the installed price, from Cost to Renovate's mid-range 'Structural' category split (56% labor, 32% materials, 11% permits and design). It is a category average rather than an addition-specific figure.