Home addition cost in Sioux City, IA
Local estimate from BLS wage data and BEA price levels. Reviewed Nov 4, 2026.
- Typical range (300 sq ft)
- $34,700 – $70,300
- Per sq ft
- $114 – $229
- before permit
- Versus US midpoint
- −9%
- US $57,500
- Rank of 300 metros
- #176
- 1 = most expensive
Sioux City homeowners pay roughly $34,700 to $70,300 to build a home addition at 300 sq ft, or $114 to $229 per sq ft (permit not included). Against the US midpoint, Sioux City is 9% lower. Carpenters earn a median of $24.57 an hour in the Sioux City area, 16% below the US median of $29.12.
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Estimated cost for 300 sq ft in Sioux City, IA, standard level
$45,400 to $59,700
About $149 to $194 per sq ft before permits. Labor is about 66% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $14,700 | $19,200 |
| Labor | $29,900 | $39,100 |
| Permits and fees | $820 | $1,350 |
| Total | $45,400 | $59,700 |
Cost breakdown for 300 sq ft in Sioux City, IA
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $11,300 | $16,900 | $22,600 | 32% |
| Labor | $23,000 | $34,500 | $46,000 | 66% |
| Permits and fees | $430 | $1,100 | $1,750 | 2% |
| Total | $34,700 | $52,500 | $70,300 | 100% |
Why Sioux City prices look the way they do
Labor is 66% of the midpoint bill here, against 67% nationally. The mix of trades behind this job is carpenters (50%), cement masons and concrete finishers (10%), electricians (10%), plumbers, pipefitters and steamfitters (10%), drywall and ceiling tile installers (10%), roofers (10%). We weight each trade's local median wage by that share and compare it with the national median. In Sioux City the blended ratio comes out at 0.90.
On the materials line, the BEA goods price index for the Sioux City metro is 94.0 (US = 100). The midpoint materials bill for 300 sq ft comes to $16,900, compared with $18,000 at national prices. Permit and inspection fees are scaled by the broader index (86.5) and land at $430 to $1,750.
Why two Sioux City quotes can differ
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).
Is Sioux City cheap or dear? The local comparison
Contractors rarely work more than an hour or two from home, so the neighboring metros set a rough ceiling and floor for your quotes. Midpoints for 300 sq ft range from $50,700 to $56,300 across Sioux City and its five closest metros.
| Area | Range | Midpoint | vs. here |
|---|---|---|---|
| Sioux City, IAthis page | $34,700 – $70,300 | $52,500 | |
| Sioux Falls, SD75 miles | $33,500 – $67,900 | $50,700 | −3% |
| Omaha, NE85 miles | $34,700 – $70,400 | $52,600 | level |
| Lincoln, NE120 miles | $33,600 – $68,100 | $50,800 | −3% |
| Des Moines, IA145 miles | $37,300 – $75,400 | $56,300 | +7% |
| Waterloo, IA195 miles | $35,600 – $72,000 | $53,800 | +2% |
| Iowa (statewide) | $35,900 – $72,700 | $54,300 | +3% |
| United States | $38,000 – $77,000 | $57,500 | +9% |
Across 300 US metros, Sioux City comes in at #176 from the top. The priciest is Honolulu, HI at $79,600; the cheapest is Brownsville, TX at $44,300 (midpoints, 300 sq ft). Statewide, Sioux City is 3% below the Iowa figure.
Other Iowa metros
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Des Moines, IA | 404,130 jobs | $37,300 – $75,400 | $56,300 | +7% |
| Davenport, IA | 180,450 jobs | $38,000 – $77,000 | $57,500 | +9% |
| Cedar Rapids, IA | 139,260 jobs | $36,500 – $73,800 | $55,100 | +5% |
| Iowa City, IA | 93,760 jobs | $34,100 – $69,000 | $51,600 | −2% |
| Waterloo, IA | 84,260 jobs | $35,600 – $72,000 | $53,800 | +2% |
| Dubuque, IA | 58,470 jobs | $36,400 – $73,600 | $55,000 | +5% |
Cities with a workforce like Sioux City's
Big cities and small ones price differently, so here is Sioux City against the 4 metros with the closest total employment.
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Abilene, TX | 75,070 jobs | $31,000 – $62,900 | $47,000 | −11% |
| Blacksburg, VA | 74,070 jobs | $33,400 – $67,800 | $50,600 | −4% |
| Kenosha, WI | 75,450 jobs | $40,100 – $81,100 | $60,600 | +15% |
| Rapid City, SD | 73,820 jobs | $33,200 – $67,300 | $50,300 | −4% |
Sioux City: what basic, standard and premium work costs
Three bands are cut from the same cited range and localized for Sioux City wages and prices. They overlap on purpose: a good standard job and a modest premium job can cost the same. The grid below prices the same bands at 3 common sizes.
Basic
$34,700 to $49,000
Bump-out or simple room without plumbing
Standard
$45,400 to $59,700
Standard room addition with HVAC and electrical
Premium
$56,100 to $70,300
Large addition with bath or kitchen and a new foundation
| Size | Basic | Standard | Premium |
|---|---|---|---|
| bump-out (100 sq ft) | $11,900 – $17,000 | $15,700 – $20,800 | $19,500 – $24,600 |
| 20x20 room (400 sq ft) | $46,200 – $65,000 | $60,300 – $79,100 | $74,400 – $93,200 |
| large suite (600 sq ft) | $69,000 – $97,000 | $90,000 – $118,000 | $111,000 – $139,000 |
Local wages behind the labor line
Wages are the part of this estimate that changes most from town to town. 6 trades carry the job here, and each is compared with its US median. The weighted result for Sioux City is 0.90 times the national level.
For carpenters (47-2031, weighted 50%) the local median is $24.57 an hour, which is 16% below the national $29.12. The middle half of them earn between $22.02 and $29.52 an hour. BLS counts 350 of them working in the area, 46.7 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 $27.60 an hour, which is in line with the national $27.41. The middle half of them earn between $22.32 and $28.75 an hour. BLS counts 120 of them working in the area, 16.0 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 $35.54 an hour, 17% above the US median of $30.38. The middle half of them earn between $23.43 and $40.83 an hour. About 300 work in the metro. That is 40.0 per 10,000 jobs, compared with 48.7 nationally, so expect fewer local crews to bid.
For plumbers, pipefitters and steamfitters (47-2152, weighted 10%) the local median is $29.28 an hour, which is 5% below the national $30.67. The middle half of them earn between $23.54 and $36.15 an hour. BLS counts 240 of them working in the area, 32.0 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 $23.49 an hour, 17% below the US median of $28.33. The middle half of them earn between $21.90 and $28.55 an hour. About 70 work in the metro. That is 9.3 per 10,000 jobs, compared with 5.3 nationally, which suggests plenty of local crews to bid.
For roofers (47-2181, weighted 10%) the local median is $22.62 an hour, which is 15% below the national $26.65. The middle half of them earn between $18.46 and $27.56 an hour. BLS counts 90 of them working in the area, 12.0 for every 10,000 jobs (US: 8.7), so the local bench is deeper than average.
Quotes come from real crews, not medians. If the carpenters on your job are paid at the 75th percentile ($29.52 an hour) instead of the median, the labor line grows by about $3,250. At the 25th percentile ($22.02) it shrinks by about $1,650. The total moves by 6.2% or 3.2%, so wages alone rarely explain a quote that is far outside our range.
For context on the local economy, BLS counts 75,010 jobs in the Sioux City area. That makes it the 247th largest of the 300 metros we cover, with 0.05% of US employment.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Carpenters (47-2031) | 50% | $22.02 | $24.57 | $29.52 | $29.12 | 0.84 | metro |
| Cement masons and concrete finishers (47-2051) | 10% | $22.32 | $27.60 | $28.75 | $27.41 | 1.01 | metro |
| Electricians (47-2111) | 10% | $23.43 | $35.54 | $40.83 | $30.38 | 1.17 | metro |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $23.54 | $29.28 | $36.15 | $30.67 | 0.95 | metro |
| Drywall and ceiling tile installers (47-2081) | 10% | $21.90 | $23.49 | $28.55 | $28.33 | 0.83 | metro |
| Roofers (47-2181) | 10% | $18.46 | $22.62 | $27.56 | $26.65 | 0.85 | metro |
| Blended | 100% | 0.90 | |||||
When to schedule home addition in Sioux City
We use NOAA's 1991-2020 climate normals for Sioux City Gateway Ap (5 miles from the city center). These are 30-year monthly averages, not forecasts.
April through October is the stretch where digging, grading and setting material in the ground runs into the fewest weather problems in Sioux City (7 of 12 months). January, February, March, November and December have an average overnight low at or below freezing (32°F).
In January, February, March, November and December the average low is at or below freezing, which means frozen ground and slower digging, compaction and sod or stone placement. NOAA counts about 154 days a year with a low at or below 32°F at this station.
Sioux City gets about 29 inches of precipitation in a normal year, including roughly 36 inches of snow. The wettest months are May, June and August (4.3 inches in June). Inside the workable window, September and October are the driest, at 2.8 and 2.2 inches. The station averages about 25 days a year at 90°F or above.
Does the season change the price? Probably, but we do not have a sourced seasonal price curve, so the estimator shows a year-round figure and does not adjust by month. When you collect quotes, ask whether scheduling in a slower month gets a better rate.
| Month | Avg high °F | Avg low °F | Precip (in) | For this job |
|---|---|---|---|---|
| Jan | 30 | 10 | 0.7 | Cold |
| Feb | 34 | 15 | 0.9 | Cold |
| Mar | 48 | 26 | 1.8 | Cold |
| Apr | 61 | 37 | 3.1 | Workable |
| May | 72 | 49 | 3.9 | Workable |
| Jun | 82 | 59 | 4.3 | Workable |
| Jul | 85 | 63 | 3.4 | Workable |
| Aug | 83 | 61 | 3.9 | Workable |
| Sep | 77 | 51 | 2.8 | Workable |
| Oct | 63 | 38 | 2.2 | Workable |
| Nov | 47 | 25 | 1.3 | Cold |
| Dec | 33 | 15 | 1.0 | Cold |
Planning more than one job in Sioux City?
Because every project leans on different trades, Sioux City's wage level does not move all prices equally. Against the US midpoint, bathroom remodel runs −6% and roof replacement −10%.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $17,300 – $29,400 | −7% |
| Bathroom remodel | 45 sq ft | $4,400 – $21,900 | −6% |
| Detached garage | 576 sq ft | $27,200 – $54,500 | −6% |
| Roof replacement | 2,000 sq ft of roof | $5,450 – $11,300 | −10% |
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 $45,400 to $59,700 for Sioux City, IA is attached.
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Multi-page report for Sioux City, IA: 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 Sioux City: your questions
+How much does it cost to build a home addition in Sioux City?
For 300 sq ft, expect $34,700 to $70,300 in the Sioux City area. A standard-spec job lands at $45,400 to $59,700. Small jobs usually cost more per sq ft and large ones less.
+What is the price per sq ft for home addition in Sioux City?
About $114 to $229 per sq ft for materials and labor, plus $430 to $1,750 for the permit if one is needed. The US range is $125 to $250.
+Is home addition cheaper in Sioux City or Sioux Falls?
Sioux Falls is 75 miles away. The midpoint for 300 sq ft there is $50,700, which is 3% less than Sioux City ($52,500). Wage and materials indexes both feed that gap.
+How much of the bill is labor in Sioux City?
About 66% at the midpoint, or $34,500 out of $52,500. Materials are 32% and permits 2%. Nationally, labor is 67%.
+What would 20x20 room (400 sq ft) cost in Sioux City?
$46,200 to $93,200. Pick a different size in the estimator above to get your own number.
+Does home addition need a permit in Sioux City?
Often, but rules are set by your city or county building office, so call before you hire. Budget $430 to $1,750 for fees in the Sioux City area (our national range of $500 to $2,000 scaled by the local price level).
+Is Sioux City expensive for home addition compared with the rest of Iowa?
Sioux City is 3% below the Iowa statewide estimate ($54,300 at the midpoint). We cover 7 metros in Iowa; see the state page to compare them.
+What do carpenters earn in Sioux City?
The BLS median is $24.57 an hour in the Sioux City area, compared with $29.12 nationally. The 25th to 75th percentile range is $22.02 to $29.52.
+What do basic and premium home addition work cost in Sioux City?
For 300 sq ft, basic work runs $34,700 to $49,000 and premium work $56,100 to $70,300. Basic means: bump-out or simple room without plumbing. Premium means: large addition with bath or kitchen and a new foundation.
+When is the best time to build a home addition in Sioux City?
Based on NOAA 1991-2020 normals, the comfortable months for this kind of work are April through October. September and October are typically the driest of those months. Local contractors' schedules matter as much as the weather, so book early for the busy months.
Home addition near Sioux City
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.