Home addition cost in Spokane, WA
Local estimate from BLS wage data and BEA price levels. Reviewed Nov 4, 2026.
- Typical range (300 sq ft)
- $41,500 – $84,000
- Per sq ft
- $137 – $273
- before permit
- Versus US midpoint
- +9%
- US $57,500
- Rank of 300 metros
- #47
- 1 = most expensive
Local price for a home addition in the Spokane area: $41,500 to $84,000 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% higher than the US figure. Carpenters earn a median of $29.76 an hour in the Spokane area, 2% above the US median of $29.12.
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Estimated cost for 300 sq ft in Spokane, WA, standard level
$54,200 to $71,200
About $178 to $232 per sq ft before permits. Labor is about 68% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $16,400 | $21,400 |
| Labor | $36,900 | $48,300 |
| Permits and fees | $950 | $1,550 |
| Total | $54,200 | $71,200 |
Cost breakdown for 300 sq ft in Spokane, WA
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $12,600 | $18,900 | $25,200 | 30% |
| Labor | $28,400 | $42,600 | $56,800 | 68% |
| Permits and fees | $500 | $1,250 | $2,000 | 2% |
| Total | $41,500 | $62,700 | $84,000 | 100% |
Why Spokane prices look the way they do
The wage side of the estimate leans on carpenters, who do 50% of the hours on a typical job. Their local median is $29.76 an hour. Add the other trades involved and the blended wage index for Spokane is 1.11 (US = 1.00), which puts labor at 68% of the total.
Materials are scaled with BEA's regional price parity for goods. Spokane is at 105.0 against 100 for the US, so a materials line of $18,000 nationally becomes $18,900 here (midpoint, 300 sq ft). Permits follow the all-items index of 100.3: $500 to $2,000.
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 Spokane. The wage table below marks each row.
Planning more than one job in Spokane?
Jobs that often go together with home addition are priced below at their usual sizes, using the same Spokane wage and price inputs. Compared with national midpoints, bathroom remodel comes out highest (+11%) and roof replacement lowest (+6%); the gap comes from the trades each job uses.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $19,700 – $33,500 | +6% |
| Bathroom remodel | 45 sq ft | $5,200 – $25,900 | +11% |
| Detached garage | 576 sq ft | $31,200 – $62,600 | +8% |
| Roof replacement | 2,000 sq ft of roof | $6,450 – $13,200 | +6% |
Why two Spokane quotes can differ
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).
Plumbing and fixtures
Adding a bathroom or kitchen drives the price up the most.
Spokane: what basic, standard and premium work costs
The cited range is split into basic, standard and premium bands, then scaled to Spokane. 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
$41,500 to $58,500
Bump-out or simple room without plumbing
Standard
$54,200 to $71,200
Standard room addition with HVAC and electrical
Premium
$67,000 to $84,000
Large addition with bath or kitchen and a new foundation
| Size | Basic | Standard | Premium |
|---|---|---|---|
| bump-out (100 sq ft) | $14,200 – $20,200 | $18,700 – $24,800 | $23,300 – $29,300 |
| 20x20 room (400 sq ft) | $55,200 – $77,600 | $72,000 – $94,500 | $88,900 – $111,500 |
| large suite (600 sq ft) | $82,500 – $116,000 | $107,500 – $141,000 | $132,500 – $166,000 |
Spokane against nearby metros and the rest of Washington
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 $54,000 to $70,900 across Spokane and its five closest metros.
| Area | Range | Midpoint | vs. here |
|---|---|---|---|
| Spokane, WAthis page | $41,500 – $84,000 | $62,700 | |
| Coeur d'Alene, ID55 miles | $35,700 – $72,300 | $54,000 | −14% |
| Kennewick, WA140 miles | $43,500 – $88,100 | $65,800 | +5% |
| Missoula, MT175 miles | $38,300 – $77,500 | $57,900 | −8% |
| Yakima, WA185 miles | $41,100 – $83,200 | $62,100 | −1% |
| Seattle, WA200 miles | $46,900 – $94,800 | $70,900 | +13% |
| Washington (statewide) | $45,200 – $91,400 | $68,300 | +9% |
| United States | $38,000 – $77,000 | $57,500 | −8% |
Out of the 300 metros we cover, Spokane ranks #47 for the cost of this job (#1 is the most expensive). Statewide, Spokane is 8% below the Washington figure.
Elsewhere in Washington
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Seattle, WA | 2,086,210 jobs | $46,900 – $94,800 | $70,900 | +13% |
| Olympia, WA | 130,300 jobs | $42,800 – $86,500 | $64,700 | +3% |
| Kennewick, WA | 129,490 jobs | $43,500 – $88,100 | $65,800 | +5% |
| Yakima, WA | 97,010 jobs | $41,100 – $83,200 | $62,100 | −1% |
| Bremerton, WA | 93,740 jobs | $42,400 – $85,800 | $64,100 | +2% |
| Bellingham, WA | 91,390 jobs | $45,500 – $92,000 | $68,800 | +10% |
Metros of a similar size
Big cities and small ones price differently, so here is Spokane against the 4 metros with the closest total employment.
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Lakeland, FL | 265,280 jobs | $32,300 – $65,500 | $48,900 | −22% |
| Scranton, PA | 255,620 jobs | $37,400 – $75,800 | $56,600 | −10% |
| Huntsville, AL | 266,650 jobs | $33,200 – $67,300 | $50,200 | −20% |
| Lancaster, PA | 252,230 jobs | $37,000 – $75,100 | $56,100 | −11% |
The best months for home addition in Spokane
Climate numbers on this page come from NOAA's 1991-2020 U.S. Climate Normals at the nearest suitable station, Spokane Felts 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 Spokane 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 123 days a year with a low at or below 32°F at this station.
Spokane gets about 17 inches of precipitation in a normal year. The wettest months are January, November and December (2.2 inches in December). Inside the workable window, July and August are the driest, at 0.7 and 0.5 inches. The station averages about 29 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 | 38 | 26 | 2.0 | Cold |
| Feb | 43 | 27 | 1.3 | Cold |
| Mar | 51 | 32 | 1.8 | Cold |
| Apr | 60 | 37 | 1.5 | Workable |
| May | 70 | 44 | 1.7 | Workable |
| Jun | 76 | 50 | 1.5 | Workable |
| Jul | 87 | 56 | 0.7 | Workable |
| Aug | 86 | 55 | 0.5 | Workable |
| Sep | 76 | 47 | 0.7 | Workable |
| Oct | 60 | 38 | 1.5 | Workable |
| Nov | 45 | 31 | 2.0 | Cold |
| Dec | 37 | 26 | 2.2 | Cold |
Who does the work: Spokane 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 Spokane the blend is 1.11.
Carpenters (47-2031), 50% of the weighting: a median of $29.76 an hour, in line with the US median of $29.12. The middle half of them earn between $27.92 and $36.43 an hour. About 2,020 work in the metro. That is 79.0 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 $36.16 an hour, 32% above the US median of $27.41. The middle half of them earn between $27.22 and $40.58 an hour. About 400 work in the metro. That is 15.6 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 $38.38 an hour, which is 26% above the national $30.38. The middle half of them earn between $29.75 and $48.32 an hour. BLS counts 1,290 of them working in the area, 50.4 for every 10,000 jobs (US: 48.7), so the local bench is about average.
Plumbers, pipefitters and steamfitters (47-2152), 10% of the weighting: a median of $35.00 an hour, 14% above the US median of $30.67. The middle half of them earn between $27.12 and $46.27 an hour. About 810 work in the metro. That is 31.7 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 Spokane metro, so we used the Washington statewide median: $35.16 an hour against $28.33 for the US. The middle half of them earn between $30.15 and $48.45 an hour.
Roofers (47-2181), 10% of the weighting: a median of $28.23 an hour, 6% above the US median of $26.65. The middle half of them earn between $23.34 and $36.54 an hour. About 420 work in the metro. That is 16.4 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 $4,400 to the midpoint estimate; the 25th percentile takes off about $1,200. That is a swing of roughly 1.9% to 7.0% of the total, which is useful for judging whether a bid reflects wages or something else, such as scope or margin.
Spokane-Spokane Valley has 255,820 jobs in total (BLS, May 2025), ranking 101st 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% | $27.92 | $29.76 | $36.43 | $29.12 | 1.02 | metro |
| Cement masons and concrete finishers (47-2051) | 10% | $27.22 | $36.16 | $40.58 | $27.41 | 1.32 | metro |
| Electricians (47-2111) | 10% | $29.75 | $38.38 | $48.32 | $30.38 | 1.26 | metro |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $27.12 | $35.00 | $46.27 | $30.67 | 1.14 | metro |
| Drywall and ceiling tile installers (47-2081) | 10% | $30.15 | $35.16 | $48.45 | $28.33 | 1.24 | state |
| Roofers (47-2181) | 10% | $23.34 | $28.23 | $36.54 | $26.65 | 1.06 | metro |
| Blended | 100% | 1.11 | |||||
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Home addition in Spokane: your questions
+How much does it cost to build a home addition in Spokane?
For 300 sq ft, expect $41,500 to $84,000 in the Spokane area. A standard-spec job lands at $54,200 to $71,200. Small jobs usually cost more per sq ft and large ones less.
+What is the price per sq ft for home addition in Spokane?
About $137 to $273 per sq ft for materials and labor, plus $500 to $2,000 for the permit if one is needed. The US range is $125 to $250.
+Is home addition cheaper in Spokane or Coeur d'Alene?
Coeur d'Alene is 55 miles away. The midpoint for 300 sq ft there is $54,000, which is 14% less than Spokane ($62,700). Wage and materials indexes both feed that gap.
+How much of the bill is labor in Spokane?
About 68% at the midpoint, or $42,600 out of $62,700. Materials are 30% and permits 2%. Nationally, labor is 67%.
+What would 20x20 room (400 sq ft) cost in Spokane?
$55,200 to $111,500. Pick a different size in the estimator above to get your own number.
+Does home addition need a permit in Spokane?
Often, but rules are set by your city or county building office, so call before you hire. Budget $500 to $2,000 for fees in the Spokane area (our national range of $500 to $2,000 scaled by the local price level).
+Is Spokane expensive for home addition compared with the rest of Washington?
Spokane is 8% below the Washington statewide estimate ($68,300 at the midpoint). We cover 7 metros in Washington; see the state page to compare them.
+What do carpenters earn in Spokane?
The BLS median is $29.76 an hour in the Spokane area, compared with $29.12 nationally. The 25th to 75th percentile range is $27.92 to $36.43.
+What do basic and premium home addition work cost in Spokane?
For 300 sq ft, basic work runs $41,500 to $58,500 and premium work $67,000 to $84,000. 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 Spokane?
Based on NOAA 1991-2020 normals, the comfortable months for this kind of work are April through October. 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 Spokane
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.