The cost to install an electrical outlet depends on many factors. Find out what impacts the cost of installing an outlet in St. Louis, MO.
How Much Does a Whole-House Generator Installation Cost in St. Louis, MO? [2026 Data]
Generator install costs depend on your project and location. Check with a local pro for your specific job.
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Cost Insights
On average, it costs $90 to $220 daily to run a 15-to-20-kW whole-house generator in St. Louis, MO.
Fuel costs vary widely, with natural gas or propane systems running $2,000 to $21,000 per year.
Portable generators are the most affordable option, starting at around $500 per unit.
Hiring a professional generator installer near you can ensure your power is on when you need it most.
Whole-house generator installation costs in St. Louis, MO, average $1,065, with a typical range of $860 to $1,407. Local prices vary depending on the system size and fuel source. Due to frequent Midwest storms and aging electrical infrastructure, many households in St. Louis, MO, install whole-home generators to keep HVAC systems, appliances, and essential systems running during outages.
Whole-Home Generator Installation Cost Factors
The cost of a home generator in St. Louis, MO, depends on several factors, including the size, type, and fuel source of the generator you choose.
Size
Use this chart to help you estimate the total cost of your whole-house generator by size and capacity.
| Size in kW | Average Cost Range | Home Size |
|---|---|---|
| 1–6kW | $500–$1,800 | Refrigerator, freezer, sump pump, lighting, and a few small appliances |
| 7.5–10kW | $2,000–$3,500 | All essential appliances plus a well pump, furnace fan, and additional lighting and outlets |
| 14–18kW | $4,000–$5,500 | All essential appliances plus air conditioning, hot water heater, and additional appliances |
| 20–24kW | $5,000–$6,500 | All essential and non-essential appliances, including multiple air conditioners and electric ranges |
| 26–32kW | $6,500–$15,000 | All home appliances and systems, including larger HVAC systems and multiple hot water heaters |
| 36–38kW | $14,000–$16,000 | All home appliances and systems, including commercial-grade equipment |
| 45–48kW | $16,200–$21,000 | All home appliances and systems, including multiple air conditioners, electric ranges, and commercial-grade equipment |
Generator Type
There are several types of generators worth considering when determining whether a whole-house generator is right for you.
| Generator Type | Generator Capacity | Average Cost |
|---|---|---|
| Portable generators | 1kW–7.5kW | $500–$2,000 |
| Partial generators | 9kW–20kW | $2,000–$6,300 |
| Whole-house generators | 22kW–48kW | $5,000–$18,000 |
Power Type
On average, you’ll spend about $90 to $220 daily to run a 15-to-20-kW whole-house generator in St. Louis, MO. But not all fuels are alike, and depending on the brand and fuel you choose, you might spend far more than you expected in fuel costs.
Here is how much each fuel type costs per year or unit:
| Fuel Type | Cost |
|---|---|
| Natural gas | $2,000–$21,000 per year |
| Liquid propane | $2,000–$21,000 per year |
| Diesel | $3,000–$20,000 per year |
| Gasoline | $500–$3,000 per year |
| Solar generators | $2,000–$25,000 (unit price) |
| Battery back-up | $10,000–$25,000 (unit price) |
Whole-House Generator Installation Pro Costs
Costs can vary widely for whole-house generator installation in St. Louis, MO, but you can expect 20% to 50% of the project cost to go toward labor fees. Depending on the size and complexity of your installation, it may require a variety of contractors to accomplish. Electricians in St. Louis, MO, are the primary installers handling wiring, transfer switches, and load calculations. Gas fitters install lines for natural gas or propane-fueled units. Concrete contractors build generator pads if needed.
Does Installing a Whole-House Generator Increase Home Value?
A whole-house generator enhances the appeal of your home when selling in St. Louis, MO, especially in areas prone to severe storms or with aging electrical systems. Although specific ROI data for St. Louis, MO, isn’t readily available, national figures suggest that standby generators offer a 54% return on investment (ROI). Plus, local market conditions often make this investment even more worthwhile, thanks to the frequent weather-related outages common in the Midwest.
How Angi Gets Its Cost Data
Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We survey real Angi customers about their project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects.
Want to help us improve our cost data? Send us a recent project quote to [email protected]. Quotes and personal information will not be shared publicly.
Generator installs reviews from real Angi homeowners in Saint Louis, MO
5.0★ avg. • 3 total reviews
- Mike W.
Excellent work. Quickly installed at a fraction of the price.
MetaMorph LLC - Carol S.
Very professional, showed up on time. Came with all the tools he needed including a step stool to install a ceiling fan.
True Vision One - Matthew M.
Seth Rogers is an artist, much more than a woodworker. He came to our house in the midst of a blackout(yes, we were ground zero for the latest St. Louis tornadoes). No power at our house was unable to deter Seth from getting the job done. He arrived promptly, even with the traffic woes,...
Munimo Woodworking and Design - Austin G.
Service was excellent. The installer Tyler was super polite and respectful of the house. Mad City made the design, financing, and installation processes very easy. Thus far, they have been super responsive to all inquiries.
Mad City Windows & Baths - Louisa K.
Jason the owner of the company is very knowledgeable in many areas of repair and installation. I have hired him on several occasions for various things. stucco work, repairing an arch in the front of my house that was allowing water to get in. Wiring an outlet in my garage so I could turn...
JMBC Contracting LLC - Frederick J.
Very quick response and very quick installation. I would recommend this company again
- Jordan D.
We hired Brian to mud a previous door entrance that we had installed dry wall on. He was fast and extremely courteous. Heâ s been very responsive when my wife and I text him about future projects, costs, etc., which helps because we our first time home owners. We will definitely be hiring...
TNC Painting & Remodeling LLC - Tim W.
Installed decks, walls and steps around new pool. Great work!
Baker Landscaping & Concrete, LLC - Thomas Q.
Joshua Stewart did his usual excellent job in installing outdoor lights on our patio. He did work for us a couple of months ago with a ceiling fan and kitchen lights which was also excellent. i will call him again the next time I need help with an electrician. Prof. of Marketing, Dr. Tom Quirk
Loveland Home Solutions LLC - Barbara H.
I had a kitchen backsplash installed and they did it in one day. They did a great job, very pleased.
Quality Flooring
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