Home addition cost in Des Moines, IA
Local estimate from BLS wage data and BEA price levels. Reviewed Nov 4, 2026.
- Typical range (300 sq ft)
- $37,300 – $75,400
- Per sq ft
- $123 – $245
- before permit
- Versus US midpoint
- −2%
- US $57,500
- Rank of 300 metros
- #128
- 1 = most expensive
Des Moines homeowners pay roughly $37,300 to $75,400 to build a home addition at 300 sq ft, or $123 to $245 per sq ft (permit not included). Against the US midpoint, Des Moines is almost level. Building materials run about 6% below the US average here (BEA goods price index 93.7).
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 Des Moines, IA, standard level
$48,700 to $64,000
About $159 to $209 per sq ft before permits. Labor is about 68% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $14,600 | $19,100 |
| Labor | $33,200 | $43,400 |
| Permits and fees | $870 | $1,400 |
| Total | $48,700 | $64,000 |
Cost breakdown for 300 sq ft in Des Moines, IA
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $11,200 | $16,900 | $22,500 | 30% |
| Labor | $25,500 | $38,300 | $51,100 | 68% |
| Permits and fees | $460 | $1,150 | $1,850 | 2% |
| Total | $37,300 | $56,300 | $75,400 | 100% |
What is behind the Des Moines number
The wage side of the estimate leans on carpenters, who do 50% of the hours on a typical job. Their local median is $29.50 an hour. Add the other trades involved and the blended wage index for Des Moines is 1.00 (US = 1.00), which puts labor at 68% of the total.
On the materials line, the BEA goods price index for the Des Moines metro is 93.7 (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 (91.7) and land at $460 to $1,850.
Pick a size, pick a tier: home addition pricing in Des Moines
Three bands are cut from the same cited range and localized for Des Moines 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
$37,300 to $52,500
Bump-out or simple room without plumbing
Standard
$48,700 to $64,000
Standard room addition with HVAC and electrical
Premium
$60,200 to $75,400
Large addition with bath or kitchen and a new foundation
| Size | Basic | Standard | Premium |
|---|---|---|---|
| bump-out (100 sq ft) | $12,700 – $18,200 | $16,800 – $22,300 | $20,900 – $26,400 |
| 20x20 room (400 sq ft) | $49,500 – $69,700 | $64,700 – $84,800 | $79,800 – $100,000 |
| large suite (600 sq ft) | $74,100 – $104,000 | $96,500 – $126,500 | $119,000 – $149,000 |
Specs and site conditions that change a Des Moines bid
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).
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 Des Moines is 1.00 times the national level.
For carpenters (47-2031, weighted 50%) the local median is $29.50 an hour, which is in line with the national $29.12. The middle half of them earn between $24.03 and $35.68 an hour. BLS counts 1,810 of them working in the area, 44.8 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 $28.70 an hour, which is 5% above the national $27.41. The middle half of them earn between $23.89 and $33.56 an hour. BLS counts 530 of them working in the area, 13.1 for every 10,000 jobs (US: 13.3), so the local bench is about average.
Electricians (47-2111), 10% of the weighting: a median of $30.21 an hour, in line with the US median of $30.38. The middle half of them earn between $22.53 and $38.67 an hour. About 2,870 work in the metro. That is 71.0 per 10,000 jobs, compared with 48.7 nationally, which suggests plenty of local crews to bid.
For plumbers, pipefitters and steamfitters (47-2152, weighted 10%) the local median is $36.08 an hour, which is 18% above the national $30.67. The middle half of them earn between $28.70 and $45.12 an hour. BLS counts 2,150 of them working in the area, 53.2 for every 10,000 jobs (US: 30.0), so the local bench is deeper than average.
Drywall and ceiling tile installers (47-2081), 10% of the weighting: a median of $23.88 an hour, 16% below the US median of $28.33. The middle half of them earn between $21.93 and $29.79 an hour. About 80 work in the metro. That is 2.0 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 $23.80 an hour, which is 11% below the national $26.65. The middle half of them earn between $22.88 and $30.62 an hour. BLS counts 280 of them working in the area, 6.9 for every 10,000 jobs (US: 8.7), so the local bench is thinner than average.
Quotes come from real crews, not medians. If the carpenters on your job are paid at the 75th percentile ($35.68 an hour) instead of the median, the labor line grows by about $4,050. At the 25th percentile ($24.03) it shrinks by about $3,600. The total moves by 7.2% or 6.4%, so wages alone rarely explain a quote that is far outside our range.
For context on the local economy, BLS counts 404,130 jobs in the Des Moines-West Des Moines area. That makes it the 64th largest of the 300 metros we cover, with 0.26% of US employment.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Carpenters (47-2031) | 50% | $24.03 | $29.50 | $35.68 | $29.12 | 1.01 | metro |
| Cement masons and concrete finishers (47-2051) | 10% | $23.89 | $28.70 | $33.56 | $27.41 | 1.05 | metro |
| Electricians (47-2111) | 10% | $22.53 | $30.21 | $38.67 | $30.38 | 0.99 | metro |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $28.70 | $36.08 | $45.12 | $30.67 | 1.18 | metro |
| Drywall and ceiling tile installers (47-2081) | 10% | $21.93 | $23.88 | $29.79 | $28.33 | 0.84 | metro |
| Roofers (47-2181) | 10% | $22.88 | $23.80 | $30.62 | $26.65 | 0.89 | metro |
| Blended | 100% | 1.00 | |||||
When to schedule home addition in Des Moines
We use NOAA's 1991-2020 climate normals for Des Moines Intl 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 Des Moines (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 128 days a year with a low at or below 32°F at this station.
Des Moines gets about 37 inches of precipitation in a normal year, including roughly 37 inches of snow. The wettest months are May, June and August (5.3 inches in June). Inside the workable window, September and October are the driest, at 3.2 and 2.8 inches. The station averages about 22 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 | 31 | 14 | 1.1 | Cold |
| Feb | 36 | 18 | 1.3 | Cold |
| Mar | 49 | 30 | 2.2 | Cold |
| Apr | 62 | 41 | 4.0 | Workable |
| May | 72 | 52 | 5.2 | Workable |
| Jun | 82 | 62 | 5.3 | Workable |
| Jul | 86 | 66 | 3.8 | Workable |
| Aug | 84 | 64 | 4.2 | Workable |
| Sep | 77 | 55 | 3.2 | Workable |
| Oct | 63 | 43 | 2.8 | Workable |
| Nov | 48 | 30 | 1.9 | Cold |
| Dec | 36 | 20 | 1.6 | Cold |
How Des Moines compares
Same job, same size (300 sq ft), priced for the nearest metros. Des Moines is the priciest of the group. Iowa City is the cheapest at $51,600.
| Area | Range | Midpoint | vs. here |
|---|---|---|---|
| Des Moines, IAthis page | $37,300 – $75,400 | $56,300 | |
| Waterloo, IA95 miles | $35,600 – $72,000 | $53,800 | −5% |
| Iowa City, IA110 miles | $34,100 – $69,000 | $51,600 | −8% |
| Cedar Rapids, IA115 miles | $36,500 – $73,800 | $55,100 | −2% |
| Omaha, NE120 miles | $34,700 – $70,400 | $52,600 | −7% |
| Sioux City, IA145 miles | $34,700 – $70,300 | $52,500 | −7% |
| Iowa (statewide) | $35,900 – $72,700 | $54,300 | −4% |
| United States | $38,000 – $77,000 | $57,500 | +2% |
Across 300 US metros, Des Moines comes in at #128 from the top. The priciest is Honolulu, HI at $79,600; the cheapest is Brownsville, TX at $44,300 (midpoints, 300 sq ft). Statewide, Des Moines is 4% above the Iowa figure.
Other Iowa metros
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Davenport, IA | 180,450 jobs | $38,000 – $77,000 | $57,500 | +2% |
| Cedar Rapids, IA | 139,260 jobs | $36,500 – $73,800 | $55,100 | −2% |
| Iowa City, IA | 93,760 jobs | $34,100 – $69,000 | $51,600 | −8% |
| Waterloo, IA | 84,260 jobs | $35,600 – $72,000 | $53,800 | −5% |
| Sioux City, IA | 75,010 jobs | $34,700 – $70,300 | $52,500 | −7% |
| Dubuque, IA | 58,470 jobs | $36,400 – $73,600 | $55,000 | −2% |
Cities with a workforce like Des Moines's
Big cities and small ones price differently, so here is Des Moines against the 4 metros with the closest total employment.
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Bridgeport, CT | 404,180 jobs | $40,900 – $82,900 | $61,900 | +10% |
| Columbia, SC | 394,200 jobs | $32,900 – $66,800 | $49,900 | −12% |
| Albuquerque, NM | 404,700 jobs | $36,300 – $73,600 | $55,000 | −2% |
| Charleston, SC | 394,170 jobs | $33,600 – $68,200 | $50,900 | −10% |
Planning more than one job in Des Moines?
Because every project leans on different trades, Des Moines's wage level does not move all prices equally. Against the US midpoint, bathroom remodel runs −1% and roof replacement −8%.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $17,600 – $30,000 | −5% |
| Bathroom remodel | 45 sq ft | $4,650 – $23,100 | −1% |
| Detached garage | 576 sq ft | $28,200 – $56,600 | −2% |
| Roof replacement | 2,000 sq ft of roof | $5,650 – $11,600 | −8% |
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 $48,700 to $64,000 for Des Moines, IA is attached.
A detailed PDF report of this estimate, $9
Multi-page report for Des Moines, 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 Des Moines: your questions
+How much does it cost to build a home addition in Des Moines?
For 300 sq ft, expect $37,300 to $75,400 in the Des Moines area. A standard-spec job lands at $48,700 to $64,000. Small jobs usually cost more per sq ft and large ones less.
+What is the price per sq ft for home addition in Des Moines?
About $123 to $245 per sq ft for materials and labor, plus $460 to $1,850 for the permit if one is needed. The US range is $125 to $250.
+Is home addition cheaper in Des Moines or Waterloo?
Waterloo is 95 miles away. The midpoint for 300 sq ft there is $53,800, which is 5% less than Des Moines ($56,300). Wage and materials indexes both feed that gap.
+How much of the bill is labor in Des Moines?
About 68% at the midpoint, or $38,300 out of $56,300. Materials are 30% and permits 2%. Nationally, labor is 67%.
+What would 20x20 room (400 sq ft) cost in Des Moines?
$49,500 to $100,000. Pick a different size in the estimator above to get your own number.
+Does home addition need a permit in Des Moines?
Often, but rules are set by your city or county building office, so call before you hire. Budget $460 to $1,850 for fees in the Des Moines area (our national range of $500 to $2,000 scaled by the local price level).
+Is Des Moines expensive for home addition compared with the rest of Iowa?
Des Moines is 4% above 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 Des Moines?
The BLS median is $29.50 an hour in the Des Moines area, compared with $29.12 nationally. The 25th to 75th percentile range is $24.03 to $35.68.
+What do basic and premium home addition work cost in Des Moines?
For 300 sq ft, basic work runs $37,300 to $52,500 and premium work $60,200 to $75,400. 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 Des Moines?
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 Des Moines
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.