Installed Cost

Unit, pad, gas line, transfer switch and permit — priced as separate lines.

18 kW standby generator cost installed in Missouri

An 18 kW standby generator installed in Missouri

$11,559

the house including one air conditioner · typical range $8,544 – $15,580

Typical totalinstalled, 18 kw	$11,559
Range you should see in bidsthree bids on the same scope normally land inside this	$8,544 – $15,580
Labor portion45% of the job — this is the part that moves by state	$5,202
Material portion55% — bought at national prices	$6,358
Electricians pay in Missouriabout $35/hr · BLS OEWS May 2025, SOC 47-2111	$72,310/yr
U.S. mean for the same tradeSOC 47-2111	$71,490/yr
Versus the national priceMissouri trade pay runs +1.1% against the U.S. mean	+$59

Notes

Where the number comes from. The national price for an 18 kW standby generator installed is $11,500 installed — standby generator pricing published for 2026, unit plus installation. Labor is about 45% of that. Electricians in Missouri average $72,310 a year against a U.S. mean of $71,490 — a factor of 1.011 — so the labor half is scaled by that and the material half is not.
What is in the price: the generator, a concrete or composite pad, the transfer switch, electrical connection, gas piping from an existing supply, permit and commissioning.
What is not: a propane tank and its burial, a gas meter upsize where the utility requires one, trenching over long distances, and the annual service contract. These are the lines that turn a $11,559 quote into a $14,449 invoice, so ask about each one before signing.
Why state matters more than people expect. Materials ship at national prices; crews do not move. Missouri sits above the national mean by 1.1%, which lands on 45% of the job and moves the total by $59.
Use this as a bid check, not a quote. It prices an average job in an average condition. Difficult access, the state of what is being replaced, the season, and a crew booked out three months all move the real number, and none of them are in a national average for the job.

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