Market facts for spray foam contractors in St Louis
Each figure links to its public source and shows the date it applies to.
Population
278,144
Estimate for July 1, 2025
Source: U.S. Census Bureau, Vintage 2025 population estimates for cities and towns. As of July 1, 2025.
County
St. Louis city
County that contains the city's central point
Source: U.S. Census Bureau Geocoder (2020 county boundaries). As of 2020.
IECC climate zone
4A
humid climate, zone 4 of 8
Source: U.S. DOE and PNNL, Guide to Determining Climate Zone by County: Building America and IECC 2021 Updates (PNNL-33270). As of October 21, 2022.
Heating degree days per year
4,547
Normal, base 65 F, measured at CAHOKIA ST LOUIS AP
Source: NOAA NCEI 1991-2020 U.S. Climate Normals. As of 1991-2020.
Cooling degree days per year
1,476
Normal, base 65 F, measured at CAHOKIA ST LOUIS AP
Source: NOAA NCEI 1991-2020 U.S. Climate Normals. As of 1991-2020.
Median year homes were built
1938
National median: 1981 (survey estimate, with a margin of error)
Source: U.S. Census Bureau, 2024 American Community Survey 1-year estimates, table B25035. As of 2024.
Homes built before 1980
87%
National: 48% (survey estimate)
Source: U.S. Census Bureau, 2024 American Community Survey 1-year estimates, table B25034. As of 2024.
Owner-occupied homes
46%
National: 65% (survey estimate)
Source: U.S. Census Bureau, 2024 American Community Survey 1-year estimates, table B25003. As of 2024.
Median home value
$214,500
Owner-occupied homes. National: $360,600 (survey estimate)
Source: U.S. Census Bureau, 2024 American Community Survey 1-year estimates, table B25077. As of 2024.
Main heating fuel
utility gas (66%)
Share of occupied homes (survey estimate)
Source: U.S. Census Bureau, 2024 American Community Survey 1-year estimates, table B25040. As of 2024.
Drawn from the sourced figures above. No new numbers.
Homes built before 1980
Owner-occupied homes
Median home value
Heating and cooling load in a typical year
Degree days per year, a standard measure of how much heating or cooling a climate needs.
What this means for your marketing in St Louis
The Census Bureau's 2024 American Community Survey puts the median home in St Louis at a build year of 1938 (nationally: 1981), and 87% of its homes were built before 1980 (nationally: 48%). That is an older housing stock. Older homes are where attic insulation, air sealing and rim joist work tend to pay off for the owner, so retrofit and energy-bill messaging usually fits better here than a new-construction pitch.
St Louis is in St. Louis city, which falls in IECC climate zone 4A. NOAA's 1991-2020 normals for CAHOKIA ST LOUIS AP (about 6 miles away) show 4,547 heating degree days and 1,476 cooling degree days in a typical year, so heating is the larger load. For a spray foam or insulation contractor, that tends to move what homeowners search for toward cold rooms, drafts, high heating bills and ice dams. The "A" in 4A marks a humid climate, so moisture control and air sealing deserve space in your content.
46% of occupied homes in St Louis are owner-occupied (nationally: 65%), and the median home value is $214,500 (nationally: $360,600). Renters make up a large part of the city, and renters are less often the ones who commission insulation work, so the buyers you want are a smaller group of owners and landlords. It is worth checking in your Google Maps grid whether the strongest demand sits in the suburbs and towns around the city. Lower home values tend to go with more price-aware buyers, so clear pricing, financing options and any rebates you can verify help.
Of occupied homes in St Louis, 66% heat mainly with utility gas and 31% with electricity (ACS 2024). With utility gas heating most homes, owners compare their winter gas bills, so comfort and heating-bill savings are the familiar angle.
St Louis had an estimated 278,144 residents on July 1, 2025 (U.S. Census Bureau). Google Maps rankings change from one part of a market to the next, so being visible near your shop does not mean being visible across the whole service area. The free Market Visibility Audit shows your ranking at a grid of points around your business.
How the Google Maps grid works in a market like St Louis
Google Maps does not show one ranking for a whole city. The result changes block by block, depending on where the searcher is standing. Our audit searches from a grid of points around your business and records where you appear at each one. Green means you are in the top 3 at that spot. Red means customers there are not finding you.
Example from a client in Baton Rouge, Louisiana, not St Louis
Services for St Louis contractors
SEO Services for Insulation Companies
Rank higher on Google, attract the right local traffic, and convert visits into real leads with organic growth built for spray foam contractors.
Google Business Profile Optimization
Improve your Google Business Profile and local search visibility so your insulation company appears more often across Google Maps, manages reviews well, and turns views into phone calls.
Google Ads Management
Capture demand from homeowners and builders actively searching for a contractor right now, while your Google Maps and SEO visibility build behind it.
Facebook & Instagram Ads
Paid Facebook and Instagram campaigns with lead forms, landing pages and retargeting that turn homeowners scrolling their feed into estimate requests.
Website Development
Fast, mobile-friendly websites built for SEO, lead conversion, and trust, engineered to turn visitors into paying customers.
Reputation Management
Get more 5-star reviews, respond to feedback fast, and build a reputation that wins trust and wins more local jobs.
Results from other markets
These are real client results from the markets named. Client companies are not identified, and results vary by market.
Spray foam marketing in St Louis: FAQ
What climate zone is St Louis in, and why does it matter for my marketing?+
St. Louis city is in IECC climate zone 4A (U.S. Department of Energy and PNNL, 2022). Climate zone drives what insulation work homeowners ask about, so it shapes which services and keywords to put first on your website and in your ads.
Is heating or cooling the bigger driver in St Louis?+
NOAA's 1991-2020 normals for the nearest weather station show 4,547 annual heating degree days and 1,476 annual cooling degree days. Heating is the larger number, which is a useful starting point for choosing what to promote.
How old are the homes in St Louis, and does it change what I should sell?+
The Census Bureau's 2024 American Community Survey estimates a median build year of 1938 and 87% of homes built before 1980 in St Louis. Older homes tend to need retrofit work such as attic and air sealing, so lead with that.
Do most people in St Louis own their homes?+
The 2024 American Community Survey estimates that 46% of occupied homes in St Louis are owner-occupied, compared with 65% nationally. Owners are usually the ones who buy insulation work, so this is the size of the group your marketing is aimed at.
How big is the St Louis market?+
The U.S. Census Bureau estimated 278,144 residents in St Louis on July 1, 2025. Population is only one input. The audit shows how many positions you actually hold on Google Maps across the area.
Do you have an office in St Louis?+
No. Our office is in Vancouver, Washington. We work with spray foam and insulation contractors across the United States and Canada.
How do I see where my company ranks in St Louis?+
Run the free Market Visibility Audit. It checks your Google Maps ranking at a grid of points around your business and shows the map in a few minutes.
Other areas in Missouri
See where your company ranks in St Louis.
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