QuoteJuryQuoteJury › Cost guide › Whole-home standby generator installation › Illinois
How much does whole-home standby generator installation cost in Illinois?
Updated September 2026 · Illinois price index 1.32 for electrical work (national = 1.00)
In Illinois, a licensed electrician typically charges $7,300 to $21,100 to install a whole-home standby generator (about 20 kW, unit plus installation), with most jobs landing near $12,500. That is about 32% above the national average of $5,500–$16,000, based on what electricians earn in Illinois.
AI-powered second opinion using these same Illinois figures. No account, no card. Need someone to do the work? Verified pros in Illinois took the Fair Price Pledge.
What a Illinois quote means
| Quote for this job | What it means |
|---|---|
| Under $4,380 | Suspiciously low — ask what is excluded, and check licensing and insurance |
| $4,380 – $23,210 | Fair price — inside the typical range (up to 10% over the top is still normal) |
| $23,210 – $36,925 | Running high — get the quote itemized, and get a second one |
| Over $36,925 | Ripoff territory — more than 1.75× the high end of the typical range |
Same rules the QuoteJury checker uses on every quote.
What you're paying for
What is usually included: The generator, an automatic transfer switch, concrete pad, gas line and electrical connections, permits and startup.
What moves the price:
- Generator size: a 22–26 kW unit costs thousands more than a 14–18 kW unit
- Gas supply: extending a natural-gas line or adding a propane tank is often the biggest variable
- Distance from the gas meter and electrical panel to the generator pad
- Local permit, setback and noise requirements that dictate placement
- Whole-home versus managed-load coverage
Generator kW size, fuel type (natural gas line vs. propane tank), gas/electrical trenching distance, automatic transfer switch, concrete pad and permits.
Whole-home standby generator installation cost across Illinois
Typical range by metro and rural area, from BLS wage data for electricians in each area.
| Area | Typical range | Most jobs |
|---|---|---|
| Bloomington, IL | $6,300 – $18,400 | $10,900 |
| Champaign-Urbana, IL | $7,300 – $21,200 | $12,600 |
| Chicago-Naperville-Elgin, IL-IN | $7,500 – $21,700 | $12,900 |
| Decatur, IL | $6,400 – $18,500 | $11,000 |
| Kankakee, IL | $7,400 – $21,500 | $12,800 |
| Peoria, IL | $6,300 – $18,300 | $10,900 |
| Rockford, IL | $6,800 – $19,900 | $11,800 |
| Springfield, IL | $6,600 – $19,100 | $11,400 |
| East Central Illinois nonmetropolitan area | $6,100 – $17,900 | $10,600 |
| Northwest Illinois nonmetropolitan area | $6,200 – $18,200 | $10,800 |
| South Illinois nonmetropolitan area | $6,300 – $18,400 | $10,900 |
| West Central Illinois nonmetropolitan area | $6,100 – $17,700 | $10,500 |
Frequently asked
Is $12,500 a fair price for whole-home standby generator installation in Illinois?
Yes. $12,500 is right around what most homeowners in Illinois pay. Anything from $4,380 to $23,210 is inside the normal range for a licensed electrician; above $23,210 it is worth getting a second quote.
Why do quotes for the same job vary so much?
Generator size: a 22–26 kW unit costs thousands more than a 14–18 kW unit. Gas supply: extending a natural-gas line or adding a propane tank is often the biggest variable. Company overhead matters too: a large company with trucks, dispatchers and a warranty department charges more than a one-person shop, and both can be honest prices.
When should I get a second quote?
Any time a quote lands above $23,210, or when the contractor cannot break it into parts, labor and fees. Ask for the itemized version, ask what would change the price, and confirm licensing and insurance. You can also paste the quote into the free QuoteJury checker for an instant second opinion.
Other electrical jobs in Illinois
- 200-amp electrical panel upgrade
- Circuit breaker replacement
- Outlet installation or replacement
- GFCI outlet installation
- Light switch or dimmer installation
- Ceiling fan installation
- New 240-volt dedicated circuit
- Level 2 EV charger installation
- Manual generator transfer switch installation
- Electrician service call and hourly rate
- Hardwired smoke detector replacement
- Recessed lighting installation
- Light fixture replacement
Whole-home standby generator installation in other states
United States (national) · Alabama · Alaska · Arizona · Arkansas · California · Colorado · Connecticut · Delaware · District of Columbia · Florida · Georgia · Hawaii · Idaho · Indiana · Iowa · Kansas · Kentucky · Louisiana · Maine · Maryland · Massachusetts · Michigan · Minnesota · Mississippi · Missouri · Montana · Nebraska · Nevada · New Hampshire · New Jersey · New Mexico · New York · North Carolina · North Dakota · Ohio · Oklahoma · Oregon · Pennsylvania · Rhode Island · South Carolina · South Dakota · Tennessee · Texas · Utah · Vermont · Virginia · Washington · West Virginia · Wisconsin · Wyoming
Sources
- Angi (2026): $1,512–$8,803 nationally
- HomeGuide (2025): $6,000–$11,000 nationally
- HomeAdvisor (2026): $1,512–$8,803 nationally
- Bob Vila (2024): $1,524–$8,658 nationally
- U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics, May 2025 — median hourly wages by state and metro area
About these numbers. Ranges are typical market rates for a licensed, insured contractor, blended from published U.S. cost guides and adjusted with U.S. Bureau of Labor Statistics wage data (OEWS, May 2025) for each state and metro area. They are estimates, not a bid, appraisal or inspection. Real prices move with parts, access, permits and code requirements. The quote checker is AI-powered and labeled as such.