Home services · County · Michigan
HVAC and plumbing companies in St. Clair County, MI
The HVAC and plumbing companies in St. Clair County, MI, the household spending behind them and how the market ranks against other counties.
Groundwork market score · out of 100
Score 51 out of 100: Upper middle
Ranked #814 of 1,707 scored counties
#38 of 61 scored counties in Michigan
- Listings
- 39
- 0 chain locations (0%)
- Official establishments
- 51
- +13.3% since 2019
- Household spending a year
- $178.6M
- On home repairs, maintenance and insurance · $2,634 a household
- Spending per listing
- $4.6M
- 4% below the U.S.
- Listings per 10k households
- 5.8
- 8% below the U.S.
- Population, 2025
- 160,486
- +0.1% since 2020
See the HVAC and plumbing companies around any address in St. Clair 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 St. Clair 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
At $2,634 per household (13% below the U.S. average), households in St. Clair County spend about $178.6M a year on home repairs, maintenance and insurance. That is about $4.6M of household spending for each company on map listings, 4% below 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 39 HVAC and plumbing companies on map listings in St. Clair County as of September 2026. None of them are chain locations, against 4% across the U.S. That is 5.8 per 10,000 households, 8% below the U.S. rate of 6.3.
In 2023, official counts showed 51 businesses with payroll in St. Clair County classed as plumbing, heating and air-conditioning contractors, up 13.3% from 2019. That is one for every 1,330 households, against one for every 1,162 across the U.S. Since fiscal 2022, 4 SBA-backed loans worth $277K have gone to businesses classed as plumbing, heating and air-conditioning contractors in St. Clair County.
Between 2020 and 2025, the population of St. Clair County grew 0.1%, slower than the U.S. (+3.1%). For HVAC and plumbing companies, St. Clair County has a Groundwork market score of 51 (upper middle): #814 of 1,707 scored counties and #38 of 61 scored counties in Michigan.
How St. Clair County compares
The same measures for Michigan 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 | St. Clair County | Michigan | U.S. |
|---|---|---|---|
| Listings per 10k households | 5.8 | 5.3 | 6.3 |
| Spending per listing | $4.6M | $5.2M | $4.8M |
| Households per official establishment | 1,330 | 1,532 | 1,162 |
| Official establishment growth, 2019–2023 | +13.3% | +7.6% | +7.6% |
| Population growth, 2020–2025 | +0.1% | +0.6% | +3.1% |
| Spending per household on home repairs, maintenance and insurance | $2,634 | $2,711 | $3,018 |
| Median household income | $71,270 | $72,875 | $80,734 |
| Groundwork market score | 51 | 55 |
Official counts and lending
Businesses
- Official establishments, 2019 to 2023
- 45 → 51+13.3% over the period
- Employees, 2023
- 292
- Annual payroll, 2023
- $17.7M
- One-person businesses, 2023
- Not publishedNot published for this business type
- Map listings, September 2026
- 390 chain locations
- Listings at the U.S. rate for this spending
- 38The U.S. ratio of listings to household spending, applied here
SBA-backed loans since fiscal 2022
- Loans
- 4
- Amount
- $277K
SBA-backed loans to businesses classed as plumbing, heating and air-conditioning contractors in St. Clair 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 St. Clair County
- Population, 2025 estimate
- 160,486+0.1% since 2020
- Households
- 67,816
- Median age
- 44.6
- Homes lived in by their owners
- 81%
- Vehicles per household
- 1.8
- Land area
- 722 sq. mi.
- People per square mile
- 222
- Median household income
- $71,270+25.1% vs. 2015–2019, before inflation
- Average household income
- $90,621
- Median home value
- $224,600
- Jobs located here
- 41,623
- Daytime population
- 129,372Residents who don’t work, plus everyone whose job is here
Looking at a specific site in St. Clair 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 St. Clair 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 Michigan
Every Michigan market ranked →The highest-scoring counties in Michigan for HVAC and plumbing companies, numbered among those based in Michigan, with St. Clair County marked.
Top counties in Michigan
| Market | Score | Listings | Per 10k households | Spending per listing | Population growth | U.S. rank |
|---|---|---|---|---|---|---|
| 1Washtenaw County, MI | 77 | 64 | 4.3 | $7.2M | −0.4% | #86 of 1,707 |
| 2Cass County, MI | 75 | 5 | 2.4 | $11.4M | +0.2% | #107 of 1,707 |
| 3Monroe County, MI | 71 | 28 | 4.4 | $6.2M | +0.7% | #184 of 1,707 |
| 4Montcalm County, MI | 71 | 10 | 4.1 | $6.1M | +4.1% | #188 of 1,707 |
| 5Mecosta County, MI | 70 | 7 | 4.2 | $5.7M | +4.7% | #206 of 1,707 |
| 6Oakland County, MI | 70 | 309 | 5.8 | $5.5M | +1.2% | #209 of 1,707 |
| 7Ingham County, MI | 69 | 49 | 4.2 | $6.1M | +1.7% | #229 of 1,707 |
| 8Tuscola County, MI | 65 | 6 | 2.8 | $8.7M | −1.2% | #318 of 1,707 |
| 9St. Joseph County, MI | 65 | 8 | 3.4 | $7.3M | +0.1% | #325 of 1,707 |
| 10Houghton County, MI | 63 | 5 | 3.5 | $7.1M | +1.6% | #386 of 1,707 |
| 38St. Clair County, MI | 51 | 39 | 5.8 | $4.6M | +0.1% | #814 of 1,707 |
Other business types in St. Clair 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 trades50
- HVAC and plumbing51
- Electricians51
- Roofing and gutters56
- Lawn, cleaning and pest control32
- Landscaping and lawn care29
- House cleaning47
- Pest control53
Real estate
Funeral services
Questions
How many HVAC and plumbing companies are in St. Clair County, MI?
As of September 2026, map listings count 39 HVAC and plumbing companies in St. Clair County. None of them are chain locations. The listings count heating and air-conditioning companies and plumbers. Official counts show 51 businesses with payroll classed as plumbing, heating and air-conditioning contractors in 2023, up 13.3% from 2019.
How much do households in St. Clair County, MI spend on home repairs, maintenance and insurance?
About $178.6M a year, or $2,634 per household. That is 13% below the U.S. average (an index of 87, where 100 is the U.S. average). Spread across the 39 HVAC and plumbing companies on map listings, it comes to $4.6M 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 67,816 households in St. Clair County and national spending patterns by income.
How does St. Clair County, MI compare with the U.S. for HVAC and plumbing companies?
St. Clair County has 5.8 HVAC and plumbing companies per 10,000 households, 8% below the U.S. rate of 6.3. Spending per company is $4.6M, 4% below the U.S. figure of $4.8M. At the U.S. ratio of HVAC and plumbing companies to household spending, St. Clair County would have about 38, against 39 on map listings. There is one business with payroll in the industry for every 1,330 households, against one for every 1,162 across the U.S. The official count rose 13.3% from 2019 to 2023, against +7.6% for the U.S.
How fast is St. Clair County, MI growing?
Population estimates put St. Clair County at 160,486 people in 2025, up 0.1% since 2020, slower than the U.S. (+3.1%). It has 67,816 households. Median household income in St. Clair County is $71,270, 12% below the U.S. median of $80,734. Against the 2015–2019 survey, the median rose 25.1%, 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. St. Clair County scores 51 for HVAC and plumbing companies (upper middle), #814 of 1,707 scored counties.
How can I see the market around a specific site?
Run a Groundwork site report on an address in St. Clair 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 St. Clair County
Screening a site or an acquisition in St. Clair 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 St. Clair 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.