Home services · County · Washington
HVAC and plumbing companies in King County, WA
Competitor counts, household spending and official business counts for HVAC and plumbing companies in King County, WA, set against other counties and the U.S.
Groundwork market score · out of 100
Score 89 out of 100: High
Ranked #11 of 1,707 scored counties
#1 of 26 scored counties in Washington
- Listings
- 388
- 22 chain locations (6%)
- Official establishments
- 468
- +0.9% since 2019
- Household spending a year
- $3.4B
- On home repairs, maintenance and insurance · $3,659 a household
- Spending per listing
- $8.9M
- 87% above the U.S.
- Listings per 10k households
- 4.1
- 35% below the U.S.
- Population, 2025
- 2,344,939
- +3.1% since 2020
See the HVAC and plumbing companies around any address in King County
The site report maps the HVAC and plumbing companies on map listings near the address, by name and distance, and sizes the households and spending around it. Or open the report at the center of King County. Signed out, you see a blurred preview; on an account, each report is one action.
Free10 actions over 3 days, no cardSurvey estimates 2020–2024 · population estimates 2025 · official business counts 2023 · map listings September 2026 · Data credits · How we measure
What this means
The Groundwork market score for HVAC and plumbing companies in King County is 89 (high), #11 of 1,707 scored counties and #1 of 26 scored counties in Washington. That puts it in the top 10% of counties for HVAC and plumbing companies.
Household spending on home repairs, maintenance and insurance in King County comes to about $3.4B a year: $3,659 per household, 21% above the U.S. average. Spread across 388 HVAC and plumbing companies, that is $8.9M per company, 87% above the U.S. figure of $4.8M. The spending figure covers all home repairs, maintenance and insurance, not only HVAC and plumbing companies.
There are 388 HVAC and plumbing companies on map listings in King County as of September 2026. Of those, 22 are chain locations, or 6%, against 4% across the U.S. That is 4.1 per 10,000 households, 35% below the U.S. rate of 6.3.
The official count of businesses with payroll classed as plumbing, heating and air-conditioning contractors in King County was 468 in 2023, up 0.9% from 2019. That is one for every 2,011 households, against one for every 1,162 across the U.S. Since fiscal 2022, 47 SBA-backed loans worth $21.9M have gone to businesses classed as plumbing, heating and air-conditioning contractors in King County. Population estimates show King County grew 3.1% from 2020 to 2025, in step with the U.S. (+3.1%).
How King County compares
The same measures for Washington and the whole U.S. Spending per listing divides a year of household spending on all home repairs, maintenance and insurance by the HVAC and plumbing companies counted, so it measures the demand for each competitor, not any business’s revenue. Households per establishment does the same with the official count.
| Measure | King County | Washington | U.S. |
|---|---|---|---|
| Listings per 10k households | 4.1 | 4.9 | 6.3 |
| Spending per listing | $8.9M | $6.5M | $4.8M |
| Households per official establishment | 2,011 | 1,367 | 1,162 |
| Official establishment growth, 2019–2023 | +0.9% | +8.9% | +7.6% |
| Population growth, 2020–2025 | +3.1% | +3.6% | +3.1% |
| Spending per household on home repairs, maintenance and insurance | $3,659 | $3,196 | $3,018 |
| Median household income | $124,746 | $98,141 | $80,734 |
| Groundwork market score | 89 | 83 |
Official counts and lending
Businesses
- Official establishments, 2019 to 2023
- 464 → 468+0.9% over the period
- Employees, 2023
- 11,062
- Annual payroll, 2023
- $1.1B
- One-person businesses, 2023
- Not publishedNot published for this business type
- Map listings, September 2026
- 38822 chain locations
- Listings at the U.S. rate for this spending
- 724The U.S. ratio of listings to household spending, applied here
SBA-backed loans since fiscal 2022
- Loans
- 47
- Amount
- $21.9M
SBA-backed loans to businesses classed as plumbing, heating and air-conditioning contractors in King County, through June 2026, placed by the borrower’s ZIP code. Official establishments are businesses with payroll; the official counts leave out places with fewer than 3.
Population and households in King County
- Population, 2025 estimate
- 2,344,939+3.1% since 2020
- Households
- 941,054
- Median age
- 38.8
- Homes lived in by their owners
- 55%
- Vehicles per household
- 1.6
- Land area
- 2,116 sq. mi.
- People per square mile
- 1,081
- Median household income
- $124,746+31.4% vs. 2015–2019, before inflation
- Average household income
- $176,807
- Median home value
- $859,900
- Jobs located here
- 1,503,962
- Daytime population
- 2,645,877Residents who don’t work, plus everyone whose job is here
Looking at a specific site in King County?
These figures cover the whole county. A site report draws rings around one address and counts what’s inside them: households, spending, jobs, and the HVAC and plumbing companies on map listings by name and distance.
Or open the report at the center of King County. Signed out, you see a blurred preview; on an account, each report is one action.
Free10 actions over 3 days, no cardHVAC and plumbing across Washington
Every Washington market ranked →The highest-scoring counties in Washington for HVAC and plumbing companies, numbered among those based in Washington, with King County marked.
Top counties in Washington
| Market | Score | Listings | Per 10k households | Spending per listing | Population growth | U.S. rank |
|---|---|---|---|---|---|---|
| 1King County, WA | 89 | 388 | 4.1 | $8.9M | +3.1% | #11 of 1,707 |
| 2Mason County, WA | 85 | 10 | 3.8 | $7.4M | +7.8% | #23 of 1,707 |
| 3Stevens County, WA | 80 | 7 | 3.6 | $7.4M | +6.6% | #64 of 1,707 |
| 4Grant County, WA | 79 | 12 | 3.4 | $7.8M | +6.3% | #70 of 1,707 |
| 5Whatcom County, WA | 77 | 40 | 4.3 | $6.8M | +3.9% | #88 of 1,707 |
| 6Benton County, WA | 76 | 36 | 4.6 | $6.4M | +6.9% | #99 of 1,707 |
| 7Pierce County, WA | 75 | 160 | 4.6 | $6.9M | +2.5% | #114 of 1,707 |
| 8Kitsap County, WA | 75 | 53 | 4.9 | $6.5M | +2.7% | #117 of 1,707 |
| 9Grays Harbor County, WA | 73 | 9 | 2.9 | $8.6M | +3.0% | #140 of 1,707 |
| 10Thurston County, WA | 70 | 72 | 6.1 | $4.9M | +2.8% | #216 of 1,707 |
Other business types in King County
Each with its Groundwork market score here, out of 100, where it has one.
Food and drink
Groceries and convenience
Auto
Beauty and personal care
Fitness and classes
Health care
Child care
Clothing and laundry
Home services
- Home repair trades84
- HVAC and plumbing89
- Electricians82
- Roofing and gutters73
- Lawn, cleaning and pest control71
- Landscaping and lawn care76
- House cleaning62
- Pest control86
Real estate
Funeral services
Questions
How many HVAC and plumbing companies are in King County, WA?
As of September 2026, map listings count 388 HVAC and plumbing companies in King County. 22 of them (6%) are chain locations. The listings count heating and air-conditioning companies and plumbers. Official counts show 468 businesses with payroll classed as plumbing, heating and air-conditioning contractors in 2023, up 0.9% from 2019.
How much do households in King County, WA spend on home repairs, maintenance and insurance?
About $3.4B a year, or $3,659 per household. That is 21% above the U.S. average (an index of 121, where 100 is the U.S. average). Spread across the 388 HVAC and plumbing companies on map listings, it comes to $8.9M per company. That spending covers all home repairs, maintenance and insurance, which HVAC and plumbing companies share with other businesses in the trade. It is estimated from the incomes of the 941,054 households in King County and national spending patterns by income.
How does King County, WA compare with the U.S. for HVAC and plumbing companies?
King County has 4.1 HVAC and plumbing companies per 10,000 households, 35% below the U.S. rate of 6.3. Spending per company is $8.9M, 87% above the U.S. figure of $4.8M. At the U.S. ratio of HVAC and plumbing companies to household spending, King County would have about 724, against 388 on map listings. There is one business with payroll in the industry for every 2,011 households, against one for every 1,162 across the U.S. The official count rose 0.9% from 2019 to 2023, against +7.6% for the U.S.
How fast is King County, WA growing?
Population estimates put King County at 2,344,939 people in 2025, up 3.1% since 2020, in step with the U.S. (+3.1%). It has 941,054 households. Median household income in King County is $124,746, 55% above the U.S. median of $80,734. Against the 2015–2019 survey, the median rose 31.4%, before inflation.
What is the Groundwork market score?
The Groundwork market score runs from 0 to 100 and compares a market with others of its kind for one business type: states with states, metro areas with metro areas, small-town markets and counties with their own. It weighs household spending per competitor (35%), households per business with payroll (25%), population growth (20%) and spending power (20%), each ranked against those peers. A higher score means that, taken together, the market has more household spending and more households for each business already there, faster population growth and more spending per household than similar markets. It describes a market, not any one site or deal. King County scores 89 for HVAC and plumbing companies (high), #11 of 1,707 scored counties.
How can I see the market around a specific site?
Run a Groundwork site report on an address in King County. It maps the HVAC and plumbing companies on map listings near the site and sizes the households and spending within the distance you choose. New accounts get 10 actions over 3 days, no card.
How the score works · Top markets for HVAC and plumbing companies · All 56 business types in King County
Screening a site or an acquisition in King County?
A site report maps the competitors on map listings near an address and sizes the households and spending around it.
The button opens the report at the center of King County. Signed out, you see a blurred preview; on an account, each report is one action.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
Figures are estimates for research only. Not investment or real estate advice.