Home addition cost in Champaign, IL
Local estimate from BLS wage data and BEA price levels. Reviewed Nov 4, 2026.
- Typical range (300 sq ft)
- $42,500 – $85,900
- Per sq ft
- $140 – $280
- before permit
- Versus US midpoint
- +12%
- US $57,500
- Rank of 300 metros
- #35
- 1 = most expensive
A home addition in Champaign, IL usually costs $42,500 to $85,900 for 300 sq ft. That works out to about $140 to $280 per sq ft before permits. Compared with the national midpoint that is $6,750 more. Carpenters earn a median of $32.20 an hour in the Champaign area, 11% above the US median of $29.12.
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Estimated cost for 300 sq ft in Champaign, IL, standard level
$55,500 to $72,900
About $182 to $238 per sq ft before permits. Labor is about 72% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $14,600 | $19,100 |
| Labor | $40,000 | $52,400 |
| Permits and fees | $880 | $1,450 |
| Total | $55,500 | $72,900 |
Cost breakdown for 300 sq ft in Champaign, IL
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $11,200 | $16,900 | $22,500 | 26% |
| Labor | $30,800 | $46,200 | $61,600 | 72% |
| Permits and fees | $460 | $1,150 | $1,850 | 2% |
| Total | $42,500 | $64,200 | $85,900 | 100% |
What is behind the Champaign number
Labor is 72% 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 Champaign the blended ratio comes out at 1.21.
Materials are scaled with BEA's regional price parity for goods. Champaign is at 93.6 against 100 for the US, so a materials line of $18,000 nationally becomes $16,900 here (midpoint, 300 sq ft). Permits follow the all-items index of 92.7: $460 to $1,850.
Data note: 10% of the labor weighting for this project uses a statewide median because BLS has no published metro figure for that trade in Champaign. The wage table below marks each row.
Why two Champaign 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).
What local crews earn in Champaign
The labor line is built from BLS wage data, one trade at a time. This job draws on 6 trades. We compare each trade's local median with the US median, weight the ratios by how much of the job each trade does, and apply the blend to the national labor cost. For Champaign the blend is 1.21.
Carpenters (47-2031), 50% of the weighting: a median of $32.20 an hour, 11% above the US median of $29.12. The middle half of them earn between $24.37 and $42.23 an hour. About 310 work in the metro. That is 29.4 per 10,000 jobs, compared with 43.1 nationally, so expect fewer local crews to bid.
Cement masons and concrete finishers (47-2051), 10% of the weighting: a median of $35.90 an hour, 31% above the US median of $27.41. The middle half of them earn between $25.52 and $40.23 an hour. About 110 work in the metro. That is 10.4 per 10,000 jobs, compared with 13.3 nationally, so expect fewer local crews to bid.
For electricians (47-2111, weighted 10%) the local median is $48.23 an hour, which is 59% above the national $30.38. The middle half of them earn between $31.23 and $50.82 an hour. BLS counts 410 of them working in the area, 38.9 for every 10,000 jobs (US: 48.7), so the local bench is thinner than average.
Plumbers, pipefitters and steamfitters (47-2152), 10% of the weighting: a median of $45.93 an hour, 50% above the US median of $30.67. The middle half of them earn between $31.69 and $54.26 an hour. About 390 work in the metro. That is 37.0 per 10,000 jobs, compared with 30.0 nationally, which suggests plenty of local crews to bid.
Drywall and ceiling tile installers (47-2081) carry 10% of the labor weighting. BLS does not publish this trade for the Champaign metro, so we used the Illinois statewide median: $30.38 an hour against $28.33 for the US. The middle half of them earn between $24.78 and $49.27 an hour.
Roofers (47-2181), 10% of the weighting: a median of $28.92 an hour, 9% above the US median of $26.65. The middle half of them earn between $22.85 and $38.56 an hour. About 70 work in the metro. That is 6.6 per 10,000 jobs, compared with 8.7 nationally, so expect fewer local crews to bid.
A quick sensitivity check: moving the lead trade (carpenters) from the median to the 75th percentile wage adds about $6,600 to the midpoint estimate; the 25th percentile takes off about $5,150. That is a swing of roughly 8.0% to 10.3% of the total, which is useful for judging whether a bid reflects wages or something else, such as scope or margin.
Champaign-Urbana has 105,500 jobs in total (BLS, May 2025), ranking 196th by size among the 300 metros on this site.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Carpenters (47-2031) | 50% | $24.37 | $32.20 | $42.23 | $29.12 | 1.11 | metro |
| Cement masons and concrete finishers (47-2051) | 10% | $25.52 | $35.90 | $40.23 | $27.41 | 1.31 | metro |
| Electricians (47-2111) | 10% | $31.23 | $48.23 | $50.82 | $30.38 | 1.59 | metro |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $31.69 | $45.93 | $54.26 | $30.67 | 1.50 | metro |
| Drywall and ceiling tile installers (47-2081) | 10% | $24.78 | $30.38 | $49.27 | $28.33 | 1.07 | state |
| Roofers (47-2181) | 10% | $22.85 | $28.92 | $38.56 | $26.65 | 1.09 | metro |
| Blended | 100% | 1.21 | |||||
Champaign weather and the home addition calendar
Climate numbers on this page come from NOAA's 1991-2020 U.S. Climate Normals at the nearest suitable station, Champaign Willard Ap (5 miles from the city center). They are 30-year averages, so any one year can run hotter, colder or wetter.
For digging, grading and setting material in the ground, the comfortable months in Champaign are April through October: 7 of 12. Outside them, 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 122 days a year with a low at or below 32°F at this station.
Champaign gets about 37 inches of precipitation in a normal year. The wettest months are May, June and July (4.4 inches in May). Inside the workable window, September and October are the driest, at 3.0 and 3.0 inches. The station averages about 22 days a year at 90°F or above.
We do not adjust the estimate by month, because we have no reliable published data on seasonal pricing. It is still worth asking contractors whether an off-peak start date changes their bid.
| Month | Avg high °F | Avg low °F | Precip (in) | For this job |
|---|---|---|---|---|
| Jan | 34 | 18 | 2.1 | Cold |
| Feb | 39 | 22 | 1.8 | Cold |
| Mar | 52 | 31 | 2.6 | Cold |
| Apr | 65 | 41 | 3.7 | Workable |
| May | 76 | 52 | 4.4 | Workable |
| Jun | 84 | 62 | 4.3 | Workable |
| Jul | 85 | 64 | 3.9 | Workable |
| Aug | 84 | 62 | 3.1 | Workable |
| Sep | 79 | 55 | 3.0 | Workable |
| Oct | 67 | 43 | 3.0 | Workable |
| Nov | 52 | 32 | 2.9 | Cold |
| Dec | 39 | 24 | 2.1 | Cold |
Cost by quality level and size in Champaign
The cited range is split into basic, standard and premium bands, then scaled to Champaign. Bands overlap, because plenty of standard jobs cost as much as a light premium one. Sizes run from bump-out (100 sq ft) to large suite (600 sq ft).
Basic
$42,500 to $59,900
Bump-out or simple room without plumbing
Standard
$55,500 to $72,900
Standard room addition with HVAC and electrical
Premium
$68,600 to $85,900
Large addition with bath or kitchen and a new foundation
| Size | Basic | Standard | Premium |
|---|---|---|---|
| bump-out (100 sq ft) | $14,500 – $20,600 | $19,100 – $25,300 | $23,700 – $29,900 |
| 20x20 room (400 sq ft) | $56,500 – $79,500 | $73,800 – $96,700 | $91,000 – $114,000 |
| large suite (600 sq ft) | $84,600 – $118,500 | $110,000 – $144,500 | $136,000 – $170,000 |
Related projects, priced for Champaign
Jobs that often go together with home addition are priced below at their usual sizes, using the same Champaign wage and price inputs. Compared with national midpoints, bathroom remodel comes out highest (+15%) and kitchen remodel lowest (level); the gap comes from the trades each job uses.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $18,600 – $31,600 | level |
| Bathroom remodel | 45 sq ft | $5,400 – $26,700 | +15% |
| Detached garage | 576 sq ft | $31,100 – $62,400 | +7% |
| Roof replacement | 2,000 sq ft of roof | $6,500 – $12,900 | +4% |
How Champaign compares
Same job, same size (300 sq ft), priced for the nearest metros. Springfield is the priciest of the group at $66,800. Lafayette is the cheapest at $56,700.
| Area | Range | Midpoint | vs. here |
|---|---|---|---|
| Champaign, ILthis page | $42,500 – $85,900 | $64,200 | |
| Bloomington, IL35 miles | $43,000 – $86,900 | $64,900 | +1% |
| Lafayette, IN70 miles | $37,500 – $75,900 | $56,700 | −12% |
| Peoria, IL75 miles | $43,700 – $88,300 | $66,000 | +3% |
| Terre Haute, IN75 miles | $38,400 – $77,600 | $58,000 | −10% |
| Springfield, IL80 miles | $44,200 – $89,400 | $66,800 | +4% |
| Illinois (statewide) | $47,400 – $95,800 | $71,600 | +12% |
| United States | $38,000 – $77,000 | $57,500 | −10% |
Out of the 300 metros we cover, Champaign ranks #35 for the cost of this job (#1 is the most expensive). Statewide, Champaign is 10% below the Illinois figure.
Elsewhere in Illinois
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Chicago, IL | 4,513,280 jobs | $49,000 – $99,000 | $74,000 | +15% |
| Peoria, IL | 166,020 jobs | $43,700 – $88,300 | $66,000 | +3% |
| Rockford, IL | 137,650 jobs | $43,600 – $88,200 | $65,900 | +3% |
| Springfield, IL | 100,810 jobs | $44,200 – $89,400 | $66,800 | +4% |
| Bloomington, IL | 88,110 jobs | $43,000 – $86,900 | $64,900 | +1% |
Metros of a similar size
Big cities and small ones price differently, so here is Champaign against the 4 metros with the closest total employment.
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Hagerstown, MD | 107,170 jobs | $35,900 – $72,800 | $54,400 | −15% |
| St. Cloud, MN | 103,920 jobs | $40,600 – $82,100 | $61,300 | −5% |
| Columbia, MO | 107,680 jobs | $35,900 – $72,600 | $54,200 | −16% |
| Gainesville, GA | 103,870 jobs | $32,900 – $66,800 | $49,800 | −22% |
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Home addition in Champaign: your questions
+How much does it cost to build a home addition in Champaign?
For 300 sq ft, expect $42,500 to $85,900 in the Champaign area. A standard-spec job lands at $55,500 to $72,900. Small jobs usually cost more per sq ft and large ones less.
+What is the price per sq ft for home addition in Champaign?
About $140 to $280 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 Champaign or Bloomington?
Bloomington is 35 miles away. The midpoint for 300 sq ft there is $64,900, which is 1% more than Champaign ($64,200). Wage and materials indexes both feed that gap.
+How much of the bill is labor in Champaign?
About 72% at the midpoint, or $46,200 out of $64,200. Materials are 26% and permits 2%. Nationally, labor is 67%.
+What would 20x20 room (400 sq ft) cost in Champaign?
$56,500 to $114,000. Pick a different size in the estimator above to get your own number.
+Does home addition need a permit in Champaign?
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 Champaign area (our national range of $500 to $2,000 scaled by the local price level).
+Is Champaign expensive for home addition compared with the rest of Illinois?
Champaign is 10% below the Illinois statewide estimate ($71,600 at the midpoint). We cover 6 metros in Illinois; see the state page to compare them.
+What do carpenters earn in Champaign?
The BLS median is $32.20 an hour in the Champaign area, compared with $29.12 nationally. The 25th to 75th percentile range is $24.37 to $42.23.
+What do basic and premium home addition work cost in Champaign?
For 300 sq ft, basic work runs $42,500 to $59,900 and premium work $68,600 to $85,900. 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 Champaign?
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 Champaign
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.