Home addition cost in Idaho Falls, ID
Local estimate from BLS wage data and BEA price levels. Reviewed Nov 4, 2026.
- Typical range (300 sq ft)
- $34,500 – $69,900
- Per sq ft
- $113 – $227
- before permit
- Versus US midpoint
- −9%
- US $57,500
- Rank of 300 metros
- #180
- 1 = most expensive
Local price for a home addition in the Idaho Falls area: $34,500 to $69,900 for 300 sq ft. The low end is a basic job on easy ground; the high end is a premium spec with harder access. The midpoint runs 9% lower than the US figure. Carpenters earn a median of $25.07 an hour in the Idaho Falls area, 14% below the US median of $29.12.
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Estimated cost for 300 sq ft in Idaho Falls, ID, standard level
$45,100 to $59,300
About $147 to $193 per sq ft before permits. Labor is about 65% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $15,000 | $19,600 |
| Labor | $29,200 | $38,200 |
| Permits and fees | $900 | $1,450 |
| Total | $45,100 | $59,300 |
Cost breakdown for 300 sq ft in Idaho Falls, ID
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $11,500 | $17,300 | $23,100 | 33% |
| Labor | $22,500 | $33,700 | $45,000 | 65% |
| Permits and fees | $470 | $1,200 | $1,900 | 2% |
| Total | $34,500 | $52,200 | $69,900 | 100% |
Why Idaho Falls prices look the way they do
Labor is 65% 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 Idaho Falls the blended ratio comes out at 0.88.
Materials are scaled with BEA's regional price parity for goods. Idaho Falls is at 96.2 against 100 for the US, so a materials line of $18,000 nationally becomes $17,300 here (midpoint, 300 sq ft). Permits follow the all-items index of 94.4: $470 to $1,900.
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 Idaho Falls. The wage table below marks each row.
The best months for home addition in Idaho Falls
Climate numbers on this page come from NOAA's 1991-2020 U.S. Climate Normals at the nearest suitable station, Idaho Falls Fanning Fld (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 Idaho Falls are May through September: 5 of 12. Outside them, January, February, March, April, October, November and December have an average overnight low at or below freezing (32°F).
In January, February, March, April, October, 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 182 days a year with a low at or below 32°F at this station.
Idaho Falls gets about 10 inches of precipitation in a normal year. The wettest months are April, May and June (1.6 inches in May). Inside the workable window, July and August are the driest, at 0.5 and 0.6 inches. The station averages about 26 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 | 29 | 12 | 0.7 | Cold |
| Feb | 34 | 16 | 0.6 | Cold |
| Mar | 47 | 25 | 0.8 | Cold |
| Apr | 58 | 31 | 1.0 | Cold |
| May | 67 | 38 | 1.6 | Workable |
| Jun | 76 | 45 | 1.1 | Workable |
| Jul | 87 | 49 | 0.5 | Workable |
| Aug | 86 | 48 | 0.6 | Workable |
| Sep | 75 | 41 | 1.0 | Workable |
| Oct | 59 | 31 | 0.9 | Cold |
| Nov | 43 | 22 | 0.7 | Cold |
| Dec | 30 | 13 | 0.8 | Cold |
Related projects, priced for Idaho Falls
Jobs that often go together with home addition are priced below at their usual sizes, using the same Idaho Falls wage and price inputs. Compared with national midpoints, roof replacement comes out highest (−2%) and bathroom remodel lowest (−12%); the gap comes from the trades each job uses.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $17,400 – $29,600 | −6% |
| Bathroom remodel | 45 sq ft | $4,150 – $20,600 | −12% |
| Detached garage | 576 sq ft | $27,300 – $54,800 | −6% |
| Roof replacement | 2,000 sq ft of roof | $6,050 – $12,300 | −2% |
How Idaho Falls compares
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 $51,100 to $60,500 across Idaho Falls and its five closest metros.
| Area | Range | Midpoint | vs. here |
|---|---|---|---|
| Idaho Falls, IDthis page | $34,500 – $69,900 | $52,200 | |
| Logan, UT125 miles | $33,700 – $68,400 | $51,100 | −2% |
| Bozeman, MT145 miles | $40,000 – $81,000 | $60,500 | +16% |
| Ogden, UT175 miles | $34,400 – $69,800 | $52,100 | level |
| Boise, ID190 miles | $34,700 – $70,400 | $52,500 | +1% |
| Salt Lake City, UT210 miles | $37,100 – $75,300 | $56,200 | +8% |
| Idaho (statewide) | $34,700 – $70,300 | $52,500 | +1% |
| United States | $38,000 – $77,000 | $57,500 | +10% |
Out of the 300 metros we cover, Idaho Falls ranks #180 for the cost of this job (#1 is the most expensive). Statewide, Idaho Falls is 1% below the Idaho figure.
Elsewhere in Idaho
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Boise, ID | 391,790 jobs | $34,700 – $70,400 | $52,500 | +1% |
| Coeur d'Alene, ID | 72,280 jobs | $35,700 – $72,300 | $54,000 | +3% |
Metros of a similar size
Big cities and small ones price differently, so here is Idaho Falls against the 4 metros with the closest total employment.
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Hilton Head, SC | 81,920 jobs | $33,300 – $67,600 | $50,500 | −3% |
| Johnson City, TN | 81,690 jobs | $32,400 – $65,700 | $49,100 | −6% |
| Bowling Green, KY | 82,160 jobs | $34,400 – $69,800 | $52,100 | level |
| Odessa, TX | 80,910 jobs | $33,900 – $68,700 | $51,300 | −2% |
Who does the work: Idaho Falls trade wages
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 Idaho Falls the blend is 0.88.
Carpenters (47-2031), 50% of the weighting: a median of $25.07 an hour, 14% below the US median of $29.12. The middle half of them earn between $21.83 and $31.11 an hour. About 750 work in the metro. That is 91.6 per 10,000 jobs, compared with 43.1 nationally, which suggests plenty of local crews to bid.
Cement masons and concrete finishers (47-2051), 10% of the weighting: a median of $25.28 an hour, 8% below the US median of $27.41. The middle half of them earn between $22.44 and $28.69 an hour. About 250 work in the metro. That is 30.5 per 10,000 jobs, compared with 13.3 nationally, which suggests plenty of local crews to bid.
For electricians (47-2111, weighted 10%) the local median is $31.42 an hour, which is 3% above the national $30.38. The middle half of them earn between $23.27 and $40.07 an hour. BLS counts 540 of them working in the area, 66.0 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 $24.72 an hour, 19% below the US median of $30.67. The middle half of them earn between $21.23 and $33.40 an hour. About 260 work in the metro. That is 31.8 per 10,000 jobs, compared with 30.0 nationally, so the supply of crews looks typical.
Drywall and ceiling tile installers (47-2081) carry 10% of the labor weighting. BLS does not publish this trade for the Idaho Falls metro, so we used the Idaho statewide median: $21.05 an hour against $28.33 for the US. The middle half of them earn between $17.11 and $27.68 an hour.
Roofers (47-2181), 10% of the weighting: a median of $26.77 an hour, in line with the US median of $26.65. The middle half of them earn between $19.28 and $29.65 an hour. About 130 work in the metro. That is 15.9 per 10,000 jobs, compared with 8.7 nationally, which suggests plenty of local crews to bid.
A quick sensitivity check: moving the lead trade (carpenters) from the median to the 75th percentile wage adds about $3,950 to the midpoint estimate; the 25th percentile takes off about $2,150. That is a swing of roughly 4.1% to 7.6% of the total, which is useful for judging whether a bid reflects wages or something else, such as scope or margin.
Idaho Falls has 81,840 jobs in total (BLS, May 2025), ranking 233rd 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% | $21.83 | $25.07 | $31.11 | $29.12 | 0.86 | metro |
| Cement masons and concrete finishers (47-2051) | 10% | $22.44 | $25.28 | $28.69 | $27.41 | 0.92 | metro |
| Electricians (47-2111) | 10% | $23.27 | $31.42 | $40.07 | $30.38 | 1.03 | metro |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $21.23 | $24.72 | $33.40 | $30.67 | 0.81 | metro |
| Drywall and ceiling tile installers (47-2081) | 10% | $17.11 | $21.05 | $27.68 | $28.33 | 0.74 | state |
| Roofers (47-2181) | 10% | $19.28 | $26.77 | $29.65 | $26.65 | 1.00 | metro |
| Blended | 100% | 0.88 | |||||
Cost by quality level and size in Idaho Falls
The cited range is split into basic, standard and premium bands, then scaled to Idaho Falls. 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
$34,500 to $48,700
Bump-out or simple room without plumbing
Standard
$45,100 to $59,300
Standard room addition with HVAC and electrical
Premium
$55,800 to $69,900
Large addition with bath or kitchen and a new foundation
| Size | Basic | Standard | Premium |
|---|---|---|---|
| bump-out (100 sq ft) | $11,800 – $16,900 | $15,600 – $20,700 | $19,500 – $24,600 |
| 20x20 room (400 sq ft) | $45,800 – $64,500 | $59,900 – $78,600 | $73,900 – $92,600 |
| large suite (600 sq ft) | $68,500 – $96,300 | $89,300 – $117,000 | $110,000 – $138,000 |
Specs and site conditions that change a Idaho Falls bid
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.
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).
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 $45,100 to $59,300 for Idaho Falls, ID is attached.
Detailed home addition report for Idaho Falls, ID, $9
Multi-page report for Idaho Falls, ID: 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 Idaho Falls: your questions
+How much does it cost to build a home addition in Idaho Falls?
For 300 sq ft, expect $34,500 to $69,900 in the Idaho Falls area. A standard-spec job lands at $45,100 to $59,300. Small jobs usually cost more per sq ft and large ones less.
+What is the price per sq ft for home addition in Idaho Falls?
About $113 to $227 per sq ft for materials and labor, plus $470 to $1,900 for the permit if one is needed. The US range is $125 to $250.
+Is home addition cheaper in Idaho Falls or Logan?
Logan is 125 miles away. The midpoint for 300 sq ft there is $51,100, which is 2% less than Idaho Falls ($52,200). Wage and materials indexes both feed that gap.
+How much of the bill is labor in Idaho Falls?
About 65% at the midpoint, or $33,700 out of $52,200. Materials are 33% and permits 2%. Nationally, labor is 67%.
+What would 20x20 room (400 sq ft) cost in Idaho Falls?
$45,800 to $92,600. Pick a different size in the estimator above to get your own number.
+Does home addition need a permit in Idaho Falls?
Often, but rules are set by your city or county building office, so call before you hire. Budget $470 to $1,900 for fees in the Idaho Falls area (our national range of $500 to $2,000 scaled by the local price level).
+Is Idaho Falls expensive for home addition compared with the rest of Idaho?
Idaho Falls is 1% below the Idaho statewide estimate ($52,500 at the midpoint). We cover 3 metros in Idaho; see the state page to compare them.
+What do carpenters earn in Idaho Falls?
The BLS median is $25.07 an hour in the Idaho Falls area, compared with $29.12 nationally. The 25th to 75th percentile range is $21.83 to $31.11.
+What do basic and premium home addition work cost in Idaho Falls?
For 300 sq ft, basic work runs $34,500 to $48,700 and premium work $55,800 to $69,900. 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 Idaho Falls?
Based on NOAA 1991-2020 normals, the comfortable months for this kind of work are May through September. July and August 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 Idaho Falls
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.