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Insulation in St. Louis, MO

Compare 5 local insulation pros. Typical service: $1641–$3164.

Top Insulation Companies in St. Louis

  1. 1.Thornburgh Insulation Inc

    5.0★ (5 reviews)

    5.0★ from 5 reviews

    +13146445323Website

  2. 2.All Star & Roofing

    4.3★ (6 reviews)

    4.3★ from 6 reviews

    +13147718424Website

  3. 3.Bi-State Insulation, Inc.

    5.0★ (3 reviews)

    5.0★ from 3 reviews

    +13143535400Website

  4. 4.Sidney Insulation Inc

    5.0★ (1 reviews)

    5.0★ from 1 reviews

    +13147816900

  5. 5.Insulation Masters Inc

    +13146645777

Insulation Cost in St. Louis

Local ranges, adjusted for area wage and cost-of-living data.

ServiceTypical range in St. Louis
Attic blown-in insulation$1,641–$3,164/job
Attic spray foam$3,516–$7,032/job

Insulation prices in St. Louis run about 17% above the national average, based on what this trade earns in the metro area — so neighbouring cities in the same metro see similar rates.

Quotes on this page come from 5 companies serving St. Louis, rated 4.8★ on average across 15 customer reviews.

St. Louis Climate & Seasonal Timing

What St. Louis's weather means for scheduling insulation.

Last spring frost
April 2
First fall frost
November 4
Annual precipitation
43.03"
Heating degree days
4,471
Cooling degree days
1,678
MonthLowHighPrecip
Jan23.8°39.8°2.45"
Feb27.8°45.1°2.39"
Mar37°55.4°3.36"
Apr47.3°67°4.1"
May57.4°76.8°4.8"
Jun66.7°85.3°4.34"
Jul71°89.1°4.19"
Aug69.7°88.1°3.41"
Sep61.1°80.8°3.38"
Oct49.5°68.9°3.43"
Nov39.3°55.9°4.22"
Dec28.1°42.9°2.96"

NOAA station data 1.45 miles from St. Louis.

Permits & Regulations in MO

  • Missouri has no statewide painting or general contractor license; requirements are set by the city or county
  • Remodeling permits are issued by the local building department
  • Work that disturbs paint in homes built before 1978 must be done by a Lead-Safe Certified firm under the EPA Renovation, Repair and Painting Rule

License required: No state painting or remodeling license; local licensing

Sources: www.mo.gov, www.epa.gov

Insulation FAQs for St. Louis

How much does attic insulation cost in St. Louis?

Blown-in attic insulation in St. Louis typically runs $1641-$3164 for a 1,000 square foot attic; spray foam costs two to three times more.

How many insulation contractors serve St. Louis?

We track 5 insulation contractors serving St. Louis.

Is insulation in St. Louis more expensive than average?

Installation labor in St. Louis runs about +17.2% versus the national average.

How much insulation does a home in St. Louis need?

St. Louis sees about 4,471 heating degree days and 1,678 cooling degree days a year; the colder the climate, the higher the attic R-value worth paying for.

Does insulation help with St. Louis summers?

Yes -- with summer highs near 89F in St. Louis, attic insulation cuts the heat load on the air conditioner as much as it holds heat in winter.

Do insulation contractors in MO need a license?

In MO, Missouri has no statewide painting or general contractor license; requirements are set by the city or county. Adding attic insulation in St. Louis rarely needs a permit.

Is spray foam worth it in St. Louis?

Spray foam earns its price mainly when ducts or an air handler sit in the attic; otherwise blown-in at $1641-$3164 gets most St. Louis homes the same R-value for less.

How many quotes should I get for insulation in St. Louis?

Two or three; with 5 insulation contractors serving St. Louis, compare the R-value and depth each quote installs, not just the price.