Home addition cost in Iowa
Statewide estimate from BLS wages and BEA prices. Reviewed Nov 4, 2026.
- Statewide range (300 sq ft)
- $35,900 – $72,700
- Per sq ft
- $118 – $236
- before permit
- Versus US midpoint
- −6%
- US $57,500
- Metros covered
- 7
What does it cost to build a home addition in Iowa? Plan on $35,900 to $72,700 for 300 sq ft. Wages (0.95x the US blend), materials (price index 93.7) and permit costs (87.8) put the state below the national midpoint by 6%.
Inside Iowa, the metros we cover range from $51,600 (Iowa City) to $57,500 (Davenport) at the midpoint. Pick your closest city in the table for a tighter number.
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Estimated cost for 300 sq ft in Iowa (statewide), standard level
$46,900 to $61,600
About $154 to $201 per sq ft before permits. Labor is about 67% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $14,600 | $19,100 |
| Labor | $31,500 | $41,200 |
| Permits and fees | $830 | $1,350 |
| Total | $46,900 | $61,600 |
Cost breakdown for 300 sq ft in Iowa
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $11,200 | $16,900 | $22,500 | 31% |
| Labor | $24,200 | $36,300 | $48,400 | 67% |
| Permits and fees | $440 | $1,100 | $1,750 | 2% |
| Total | $35,900 | $54,300 | $72,700 | 100% |
Iowa seasons and home addition
Weather decides when digging and ground work can happen, and Iowa is not uniform. The table uses NOAA's 1991-2020 climate normals from the weather station nearest each metro we cover, and counts the months that are neither cold nor hot enough to complicate the job.
Every Iowa metro on the list has 7 comfortable months, though rainfall ranges from 29 inches a year in Sioux City to 38 in Dubuque.
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 |
|---|---|---|---|---|
| Des Moines | 14 | 86 | 37 | 7: April through October |
| Davenport | 14 | 84 | 36 | 7: April through October |
| Cedar Rapids | 11 | 83 | 36 | 7: April through October |
| Iowa City | 15 | 86 | 36 | 7: April through October |
| Waterloo | 11 | 85 | 36 | 7: April through October |
| Sioux City | 10 | 85 | 29 | 7: April through October |
| Dubuque | 11 | 82 | 38 | 7: April through October |
Iowa against its neighbors
Iowa ranks 33 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. Iowa sits at $54,300. The five states closest by workforce center are listed below.
| State | Distance | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Nebraska | 190 miles away | $33,700 – $68,300 | $51,000 | −6% |
| Missouri | 220 miles away | $37,800 – $76,500 | $57,200 | +5% |
| Wisconsin | 230 miles away | $39,300 – $79,500 | $59,400 | +9% |
| Minnesota | 240 miles away | $42,200 – $85,400 | $63,800 | +18% |
| Illinois | 240 miles away | $47,400 – $95,800 | $71,600 | +32% |
Related projects, priced for Iowa
Each project weights the trades differently, so Iowa's wage level does not push every price by the same amount. Compared with the US midpoint, detached garage is −5% and roof replacement −9%.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $17,400 – $29,600 | −6% |
| Bathroom remodel | 45 sq ft | $4,450 – $22,200 | −5% |
| Detached garage | 576 sq ft | $27,600 – $55,400 | −5% |
| Roof replacement | 2,000 sq ft of roof | $5,550 – $11,400 | −9% |
Iowa labor market for home addition
Iowa's labor line is priced from 6 trades, each compared with its US median wage. After weighting by each trade's share of the work, the state comes out at 0.95 times the national level.
Carpenters (47-2031), 50% of the weighting: a median of $27.75 an hour, 5% below the US median of $29.12. The middle half of them earn between $22.91 and $31.69 an hour. About 5,770 work in the state. That is 37.0 per 10,000 jobs, compared with 43.1 nationally, so the supply of crews looks typical.
Cement masons and concrete finishers (47-2051), 10% of the weighting: a median of $27.99 an hour, in line with the US median of $27.41. The middle half of them earn between $22.74 and $31.25 an hour. About 2,110 work in the state. That is 13.5 per 10,000 jobs, compared with 13.3 nationally, so the supply of crews looks typical.
For electricians (47-2111, weighted 10%) the local median is $29.26 an hour, which is 4% below the national $30.38. The middle half of them earn between $22.31 and $38.45 an hour. BLS counts 10,310 of them working in the state, 66.1 for every 10,000 jobs (US: 48.7), so the local bench is deeper than average.
Plumbers, pipefitters and steamfitters (47-2152), 10% of the weighting: a median of $30.72 an hour, in line with the US median of $30.67. The middle half of them earn between $24.95 and $41.02 an hour. About 5,730 work in the state. That is 36.7 per 10,000 jobs, compared with 30.0 nationally, which suggests plenty of local crews to bid.
For drywall and ceiling tile installers (47-2081, weighted 10%) the local median is $24.53 an hour, which is 13% below the national $28.33. The middle half of them earn between $21.54 and $29.70 an hour. BLS counts 290 of them working in the state, 1.9 for every 10,000 jobs (US: 5.3), so the local bench is thinner than average.
Roofers (47-2181), 10% of the weighting: a median of $23.39 an hour, 12% below the US median of $26.65. The middle half of them earn between $22.31 and $29.50 an hour. About 930 work in the state. That is 6.0 per 10,000 jobs, compared with 8.7 nationally, so expect fewer local crews to bid.
A crew paid at the 75th percentile for carpenters ($31.69 an hour) would add about $2,600 to the statewide midpoint; one at the 25th percentile ($22.91) would take off about $3,200. Use that as a rough guide to how far a bid can sit from our midpoint on wages alone.
BLS counts 1,559,240 jobs across Iowa (May 2025), which is 1.0% of US employment.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Carpenters (47-2031) | 50% | $22.91 | $27.75 | $31.69 | $29.12 | 0.95 | state |
| Cement masons and concrete finishers (47-2051) | 10% | $22.74 | $27.99 | $31.25 | $27.41 | 1.02 | state |
| Electricians (47-2111) | 10% | $22.31 | $29.26 | $38.45 | $30.38 | 0.96 | state |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $24.95 | $30.72 | $41.02 | $30.67 | 1.00 | state |
| Drywall and ceiling tile installers (47-2081) | 10% | $21.54 | $24.53 | $29.70 | $28.33 | 0.87 | state |
| Roofers (47-2181) | 10% | $22.31 | $23.39 | $29.50 | $26.65 | 0.88 | state |
| Blended | 100% | 0.95 | |||||
Iowa metro-by-metro prices
4 of the 7 metros sit above the statewide midpoint of $54,300, and the top-to-bottom gap is 12%. 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 |
|---|---|---|---|
| Davenport, IA | $38,000 – $77,000 | $57,500 | +6% |
| Des Moines, IA | $37,300 – $75,400 | $56,300 | +4% |
| Cedar Rapids, IA | $36,500 – $73,800 | $55,100 | +2% |
| Dubuque, IA | $36,400 – $73,600 | $55,000 | +1% |
| Waterloo, IA | $35,600 – $72,000 | $53,800 | −1% |
| Sioux City, IA | $34,700 – $70,300 | $52,500 | −3% |
| Iowa City, IA | $34,100 – $69,000 | $51,600 | −5% |
Basic, standard or premium: Iowa prices
Bands overlap on purpose, since a good standard job can cost as much as a light premium one. Below are the three bands for the default size, then a grid from bump-out (100 sq ft) to large suite (600 sq ft).
Basic
$35,900 to $50,600
Bump-out or simple room without plumbing
Standard
$46,900 to $61,600
Standard room addition with HVAC and electrical
Premium
$58,000 to $72,700
Large addition with bath or kitchen and a new foundation
| Size | Basic | Standard | Premium |
|---|---|---|---|
| bump-out (100 sq ft) | $12,300 – $17,500 | $16,200 – $21,500 | $20,100 – $25,400 |
| 20x20 room (400 sq ft) | $47,700 – $67,200 | $62,300 – $81,700 | $76,900 – $96,300 |
| large suite (600 sq ft) | $71,400 – $100,000 | $93,000 – $122,000 | $114,500 – $143,500 |
Why two Iowa 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).
Foundation
A foundation, framing, roofing and matching exterior finishes all have to be built before the interior work starts.
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Home addition in Iowa: your questions
+How much does it cost to build a home addition in Iowa?
$35,900 to $72,700 for 300 sq ft, using statewide wages and prices. Metro areas inside Iowa can sit above or below that.
+Which city in Iowa is cheapest for home addition?
Iowa City at about $51,600 (midpoint, 300 sq ft). The priciest is Davenport at $57,500.
+Is home addition cheaper in Iowa than the US average?
It is 6% cheaper: $54,300 against $57,500 for 300 sq ft at the midpoint.
+What share of the price is labor in Iowa?
About 67% ($36,300). Materials are 31%. Statewide labor for this job is weighted 0.95x the national wage level.
+What do carpenters earn in Iowa?
The BLS statewide median is $27.75 an hour, against $29.12 for the US. The 25th to 75th percentile range is $22.91 to $31.69.
+Where does Iowa rank for home addition costs?
33rd most expensive of 51 (the 50 states plus DC) at the midpoint, $54,300 for 300 sq ft. Rank 1 is the costliest.
+What do basic and premium home addition work cost in Iowa?
For 300 sq ft, basic work runs $35,900 to $50,600 and premium work $58,000 to $72,700. 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 Iowa?
Yes where winters or summers are hard. Of the Iowa metros we cover, Des Moines has the most comfortable months (7 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 Iowa
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.