Cost to install a whole-house generator in St. Louis, MO (2026)
Homeowners in St. Louis, MO typically pay between $4,800 and $17,000 to install a whole-house generator, with most projects landing around $8,600. Local labor and material costs here run close to the national average, which is baked into these figures.
What drives the cost
- Generator size (kW)
- Fuel type (natural gas, propane)
- Transfer switch and wiring
- Pad and gas hookup
What's typically included
- Generator and transfer switch
- Concrete pad
- Gas and electrical hookup
- Labor and permits
Where the money typically goes
As a rough rule of thumb for home systems (HVAC, electrical, plumbing) projects, quotes tend to break down like this — actual splits vary by contractor and scope:
How to get the best price in St. Louis
Get 2–3 itemized quotes from licensed, insured local pros and compare the same scope and materials. Ask about off-season timing and bundling related work. The lowest bid isn't always the best value — check reviews, licensing and warranty.
Local factors in St. Louis, MO
St. Louis has one of the higher shares of older brick housing stock among major Midwest metros, and masonry-specific repair or matching work (tuckpointing, brick replacement) is a more common cost factor here than in wood-frame-dominated markets. Missouri's freeze-thaw winters also make foundation drainage a routine consideration on exterior projects.
Frequently asked questions
How much does it cost to install a whole-house generator in St. Louis, MO?
In St. Louis, MO, it typically costs $4,800 to $17,000, with an average of about $8,600. Your exact price depends on generator size (kw) and fuel type (natural gas, propane).
What affects the price the most?
The biggest cost drivers are: Generator size (kW); Fuel type (natural gas, propane); Transfer switch and wiring; Pad and gas hookup. Getting 2–3 itemized quotes is the best way to see how these apply to your specific project.
What's usually included?
A standard quote to install a whole-house generator generally includes: Generator and transfer switch; Concrete pad; Gas and electrical hookup; Labor and permits. Always confirm what's in (and out of) scope before signing.
How can I save money?
Get multiple quotes, ask about off-season scheduling, bundle related work, and make sure you're comparing the same scope and materials. The cheapest bid isn't always the best value — check licensing, insurance and reviews.
Are these prices exact?
No — they're estimated local ranges for planning, derived from national averages adjusted for St. Louis, MO costs. For an exact number, get a free in-person quote from a local pro.