Commercial Electric Motor Service Inc.
Verified Pro
24+ years online4.9
Generator Installation in St. Louis, MO
Compare 22 generator installation contractors near you in St. Louis and surrounding area with an average rating of 4.6/5. Get free quotes, read reviews, and find the right pro for your project.
Last updated March 23, 2026
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Other Businesses in This Area
Supercenter
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4.9Bates Electric
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Generator Installation in St. Louis, MO
St. Louis generator installers serve a market where Ameren Missouri outages from ice storms, summer thunderstorms, and tornadoes drive steady demand for whole-home standby generators. Generac, Kohler, and Cummins dominate the residential market, with most installs using 18-26 kW air-cooled units running on natural gas from Spire Energy. St. Louis County or city permits cover electrical, gas, and mechanical work, with transfer switch installation requiring a Missouri-licensed electrician. Typical turn-key installs run $9,000-18,000 including unit, transfer switch, gas line, concrete pad, and permit fees. Cellular Wi-Fi monitoring alerts homeowners to weekly self-tests and any fault conditions on modern Generac and Kohler units.
St. Louis's older neighborhoods—Kingshighway corridor, north St. Louis County, and parts of south city—frequently see extended outages during ice storms when tree limbs take down overhead distribution lines. West County and Chesterfield typically see shorter outages but increasingly experience storm-driven failures. Generator demand spikes after each major storm season, with 4-8 week lead times common from April through November.
Frequently Asked Questions
- What size generator does a St. Louis home need?
- A 14-18 kW unit handles essential circuits (HVAC, kitchen, well pump). 22-26 kW handles a typical 2,500-3,500 sq ft home with central AC, electric oven, and other major loads. Whole-home coverage requires load calculations based on service panel and lifestyle. Most St. Louis installers offer free in-home assessments to size correctly.
- Can I add a generator to an older brick home?
- Yes, but older Tower Grove, Soulard, and Lafayette Square homes may need electrical service upgrades to 200-amp panels first. Spire Energy gas line upgrades may also be required for larger units. Total project cost can run $12,000-22,000 for older homes versus $9,000-15,000 for newer construction with adequate existing service.
- How often does the generator self-test?
- Modern Generac and Kohler units self-test weekly for 5-12 minutes, exercising the engine and verifying transfer switch operation. Cellular monitoring sends fault alerts to your phone. Annual professional service ($200-400) replaces oil, filters, and verifies battery health, extending unit life to 15-20 years.
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