Cost to Energy Audit and Weatherization in St. Louis, MO

$264–$7,040 in St. Louis

12% below the national average · 0.88x cost multiplier

In St. Louis, a energy audit and weatherization runs $264 to $7,040 on average — about 12% below what homeowners pay nationwide. The Midwest market's labor costs account for most of the gap, with material pricing and local permitting fees adding to the spread. Use the cost table below to compare budget, mid-range, and premium options side by side.

Cost Breakdown in St. Louis

Line Item	Low	Mid	High
Cost per audit/service	$132	$2464	$616
Materials	$44	$704	$3,520
Labor	$220	$1,056	$5,280
Permits	$0	$0	$264
Total	$264-12% vs. national avg	$1,760-12% vs. national avg	$9,064-12% vs. national avg

Budget

Professional energy audit only, blower door test, thermal imaging, written report

Mid-Range

Audit plus basic weatherization: air sealing, insulation top-off, smart thermostat

Premium

Whole-house weatherization: full air sealing, comprehensive insulation, HVAC tune-up, windows

Material Options

Material prices below are national averages; availability in St. Louis may shift costs slightly.

Material	Cost/Unit	Pros	Cons	Best For
Professional Energy Audit (Blower Door + Thermal)	$150 - $700	Identifies exactly where your home loses energy, prioritizes repairs by ROI, required for most rebate programs	Does not fix anything by itself, requires follow-through on recommendations	Every homeowner as the first step before spending on weatherizationIdentifies exactly where your home loses energy, prioritizes repairs by ROI, required for most rebate programs
DIY Energy Audit (Limited)	$0 - $50	Free, identifies obvious issues (drafts, visible insulation gaps)	Cannot measure air leakage, misses hidden infiltration, not eligible for rebate programs	Rental properties where professional audit is not justified, basic awareness onlyFree, identifies obvious issues (drafts, visible insulation gaps)
Air Sealing (Attic and Basement)	$300 - $1,500	Highest ROI of any weatherization measure, 3-5 year payback, improves comfort year-round	Labor-intensive in tight spaces, not visible after completion	Almost every home - consistently the top audit recommendationHighest ROI of any weatherization measure, 3-5 year payback, improves comfort year-round
Attic Insulation	$800 - $3,500	Major heat loss reduction, qualifies for 30% IRA tax credit, often covered by utility rebates	DIY-accessible for blown-in but professional install is faster and cleaner	Homes with less than R-30 in the attic - nearly all pre-2000 homesMajor heat loss reduction, qualifies for 30% IRA tax credit, often covered by utility rebates
Weatherstripping and Door Sweeps	$50 - $400	Cheap, DIY-accessible, immediate comfort improvement, no permit needed	Minor energy savings compared to attic and air sealing work	Quick wins, visible drafts under doors and around windowsCheap, DIY-accessible, immediate comfort improvement, no permit needed

Other Projects in St. Louis

Full Kitchen Remodel

Basement Finishing

Roof Replacement (Asphalt Shingles)

Back to national average for Energy Audit and Weatherization

St. Louis Estimate

Typical Range

$264–$7,040

vs. National Average

12% below national

Cost Multiplier

0.88x

Cost Per audit/service

$132–$616

Estimates apply St. Louis's 0.88x regional cost multiplier to national averages. Actual bids vary by contractor, project scope, and timing.

See national average costs →