Home addition cost in Kennewick, WA
Local estimate from BLS wage data and BEA price levels. Reviewed Nov 4, 2026.
- Typical range (300 sq ft)
- $43,500 – $88,100
- Per sq ft
- $143 – $287
- before permit
- Versus US midpoint
- +14%
- US $57,500
- Rank of 300 metros
- #26
- 1 = most expensive
Local price for a home addition in the Kennewick area: $43,500 to $88,100 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 14% higher than the US figure. Carpenters earn a median of $30.92 an hour in the Kennewick area, 6% above the US median of $29.12.
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Estimated cost for 300 sq ft in Kennewick, WA, standard level
$56,900 to $74,700
About $186 to $244 per sq ft before permits. Labor is about 69% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $16,400 | $21,400 |
| Labor | $39,600 | $51,700 |
| Permits and fees | $950 | $1,550 |
| Total | $56,900 | $74,700 |
Cost breakdown for 300 sq ft in Kennewick, WA
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $12,600 | $18,900 | $25,200 | 29% |
| Labor | $30,400 | $45,600 | $60,900 | 69% |
| Permits and fees | $500 | $1,250 | $2,000 | 2% |
| Total | $43,500 | $65,800 | $88,100 | 100% |
What is behind the Kennewick number
Labor is 69% 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 Kennewick the blended ratio comes out at 1.19.
Materials are scaled with BEA's regional price parity for goods. Kennewick 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 100.1: $500 to $2,000.
The best months for home addition in Kennewick
Climate numbers on this page come from NOAA's 1991-2020 U.S. Climate Normals at the nearest suitable station, Pasco Tri Cities 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 Kennewick are March through June and September through October: 6 of 12. Outside them, January, February, November and December have an average overnight low at or below freezing (32°F), and July and August have an average daytime high of 90°F or more.
In January, February, 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 112 days a year with a low at or below 32°F at this station.
Kennewick gets about 8 inches of precipitation in a normal year. The wettest months are January, November and December (1.0 inches in January). Inside the workable window, June and September are the driest, at 0.6 and 0.3 inches. The station averages about 55 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 | 41 | 28 | 1.0 | Cold |
| Feb | 49 | 28 | 0.6 | Cold |
| Mar | 59 | 33 | 0.7 | Workable |
| Apr | 67 | 38 | 0.7 | Workable |
| May | 77 | 46 | 0.7 | Workable |
| Jun | 83 | 53 | 0.6 | Workable |
| Jul | 93 | 57 | 0.1 | Hot |
| Aug | 91 | 56 | 0.3 | Hot |
| Sep | 81 | 48 | 0.3 | Workable |
| Oct | 66 | 38 | 0.7 | Workable |
| Nov | 50 | 32 | 0.9 | Cold |
| Dec | 41 | 27 | 1.0 | Cold |
Home addition: what moves the price in Kennewick
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.
Is Kennewick cheap or dear? The local comparison
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 Kennewick and its five closest metros.
| Area | Range | Midpoint | vs. here |
|---|---|---|---|
| Kennewick, WAthis page | $43,500 – $88,100 | $65,800 | |
| Yakima, WA70 miles | $41,100 – $83,200 | $62,100 | −6% |
| Spokane, WA140 miles | $41,500 – $84,000 | $62,700 | −5% |
| Seattle, WA145 miles | $46,900 – $94,800 | $70,900 | +8% |
| Coeur d'Alene, ID150 miles | $35,700 – $72,300 | $54,000 | −18% |
| Portland, OR165 miles | $46,600 – $94,300 | $70,500 | +7% |
| Washington (statewide) | $45,200 – $91,400 | $68,300 | +4% |
| United States | $38,000 – $77,000 | $57,500 | −13% |
Out of the 300 metros we cover, Kennewick ranks #26 for the cost of this job (#1 is the most expensive). Statewide, Kennewick is 4% 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 | +8% |
| Spokane, WA | 255,820 jobs | $41,500 – $84,000 | $62,700 | −5% |
| Olympia, WA | 130,300 jobs | $42,800 – $86,500 | $64,700 | −2% |
| Yakima, WA | 97,010 jobs | $41,100 – $83,200 | $62,100 | −6% |
| Bremerton, WA | 93,740 jobs | $42,400 – $85,800 | $64,100 | −3% |
| Bellingham, WA | 91,390 jobs | $45,500 – $92,000 | $68,800 | +5% |
Metros of a similar size
Big cities and small ones price differently, so here is Kennewick against the 4 metros with the closest total employment.
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Waco, TX | 129,860 jobs | $32,300 – $65,600 | $48,900 | −26% |
| Elkhart, IN | 127,730 jobs | $38,200 – $77,200 | $57,700 | −12% |
| Olympia, WA | 130,300 jobs | $42,800 – $86,500 | $64,700 | −2% |
| Norwich, CT | 126,450 jobs | $39,800 – $80,700 | $60,300 | −8% |
Planning more than one job in Kennewick?
Jobs that often go together with home addition are priced below at their usual sizes, using the same Kennewick wage and price inputs. Compared with national midpoints, bathroom remodel comes out highest (+20%) and roof replacement lowest (+7%); the gap comes from the trades each job uses.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $20,200 – $34,300 | +9% |
| Bathroom remodel | 45 sq ft | $5,600 – $27,900 | +20% |
| Detached garage | 576 sq ft | $32,300 – $64,700 | +11% |
| Roof replacement | 2,000 sq ft of roof | $6,600 – $13,400 | +7% |
Who does the work: Kennewick 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 Kennewick the blend is 1.19.
Carpenters (47-2031), 50% of the weighting: a median of $30.92 an hour, 6% above the US median of $29.12. The middle half of them earn between $29.03 and $48.19 an hour. About 1,310 work in the metro. That is 101.2 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 $37.23 an hour, 36% above the US median of $27.41. The middle half of them earn between $28.25 and $43.89 an hour. About 290 work in the metro. That is 22.4 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 $48.00 an hour, which is 58% above the national $30.38. The middle half of them earn between $33.80 and $58.00 an hour. BLS counts 1,050 of them working in the area, 81.1 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 $46.70 an hour, 52% above the US median of $30.67. The middle half of them earn between $29.15 and $61.16 an hour. About 840 work in the metro. That is 64.9 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 $30.71 an hour, which is 8% above the national $28.33. The middle half of them earn between $29.53 and $38.38 an hour. BLS counts 190 of them working in the area, 14.7 for every 10,000 jobs (US: 5.3), so the local bench is deeper than average.
Roofers (47-2181), 10% of the weighting: a median of $28.73 an hour, 8% above the US median of $26.65. The middle half of them earn between $24.61 and $36.65 an hour. About 210 work in the metro. That is 16.2 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 $11,300 to the midpoint estimate; the 25th percentile takes off about $1,250. That is a swing of roughly 1.9% to 17.2% of the total, which is useful for judging whether a bid reflects wages or something else, such as scope or margin.
Kennewick-Richland has 129,490 jobs in total (BLS, May 2025), ranking 169th 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% | $29.03 | $30.92 | $48.19 | $29.12 | 1.06 | metro |
| Cement masons and concrete finishers (47-2051) | 10% | $28.25 | $37.23 | $43.89 | $27.41 | 1.36 | metro |
| Electricians (47-2111) | 10% | $33.80 | $48.00 | $58.00 | $30.38 | 1.58 | metro |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $29.15 | $46.70 | $61.16 | $30.67 | 1.52 | metro |
| Drywall and ceiling tile installers (47-2081) | 10% | $29.53 | $30.71 | $38.38 | $28.33 | 1.08 | metro |
| Roofers (47-2181) | 10% | $24.61 | $28.73 | $36.65 | $26.65 | 1.08 | metro |
| Blended | 100% | 1.19 | |||||
Kennewick: what basic, standard and premium work costs
The cited range is split into basic, standard and premium bands, then scaled to Kennewick. 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
$43,500 to $61,300
Bump-out or simple room without plumbing
Standard
$56,900 to $74,700
Standard room addition with HVAC and electrical
Premium
$70,200 to $88,100
Large addition with bath or kitchen and a new foundation
| Size | Basic | Standard | Premium |
|---|---|---|---|
| bump-out (100 sq ft) | $14,800 – $21,200 | $19,600 – $25,900 | $24,400 – $30,700 |
| 20x20 room (400 sq ft) | $57,900 – $81,400 | $75,500 – $99,100 | $93,200 – $116,500 |
| large suite (600 sq ft) | $86,600 – $121,500 | $113,000 – $148,000 | $139,000 – $174,000 |
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Home addition in Kennewick: your questions
+How much does it cost to build a home addition in Kennewick?
For 300 sq ft, expect $43,500 to $88,100 in the Kennewick area. A standard-spec job lands at $56,900 to $74,700. Small jobs usually cost more per sq ft and large ones less.
+What is the price per sq ft for home addition in Kennewick?
About $143 to $287 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 Kennewick or Yakima?
Yakima is 70 miles away. The midpoint for 300 sq ft there is $62,100, which is 6% less than Kennewick ($65,800). Wage and materials indexes both feed that gap.
+How much of the bill is labor in Kennewick?
About 69% at the midpoint, or $45,600 out of $65,800. Materials are 29% and permits 2%. Nationally, labor is 67%.
+What would 20x20 room (400 sq ft) cost in Kennewick?
$57,900 to $116,500. Pick a different size in the estimator above to get your own number.
+Does home addition need a permit in Kennewick?
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 Kennewick area (our national range of $500 to $2,000 scaled by the local price level).
+Is Kennewick expensive for home addition compared with the rest of Washington?
Kennewick is 4% 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 Kennewick?
The BLS median is $30.92 an hour in the Kennewick area, compared with $29.12 nationally. The 25th to 75th percentile range is $29.03 to $48.19.
+What do basic and premium home addition work cost in Kennewick?
For 300 sq ft, basic work runs $43,500 to $61,300 and premium work $70,200 to $88,100. 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 Kennewick?
Based on NOAA 1991-2020 normals, the comfortable months for this kind of work are March through June and September through October. June and September 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 Kennewick
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.