How much does a whole-house generator cost?

A standby whole-house generator runs about $5,000 to $15,000 installed, including the unit, transfer switch, pad, gas line, and permit. The generator itself is often $3,000 to $6,000; the rest is installation, which varies with gas and electrical runs.

Can I install a whole-house generator myself?

No. A standby generator connects to your gas line and main electrical panel through an automatic transfer switch, which is dangerous and code-regulated work. It requires a licensed electrician and gas fitter and a permit. DIY here risks backfeeding the grid and voiding warranties.

What size generator do I need for my house?

It depends on what you want to run. A whole-home standby unit is commonly 18 to 26 kW; a partial system that powers essentials can be smaller. An installer runs a load calculation to size it, since both too small and too large cost you money.

Natural gas or propane standby generator?

Natural gas is convenient if you have a gas line, with an unlimited fuel supply and no tank to refill. Propane suits homes without natural gas and stores well, but you manage a tank. Both are reliable; availability of a gas line usually decides it.

Do I need a permit for a standby generator?

Yes, essentially always. The gas and electrical connections require permits and an inspection in nearly every jurisdiction, and many areas also have placement rules for distance from windows and property lines. A reputable installer handles the permitting as part of the job.

UPDATED JUNE 2026

Whole-House Generator Cost in Ohio

Locally calibrated hire vs. DIY cost data for whole-house generator projects in Ohio. Cited sources, permit requirements, and a full build guide, free.

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HIRE A PRO

$4,600–$13,800

Fully installed, labor + materials

DIY COST

$0–$0

Materials + rentals, your labor free

Hard

Complex project, structural or code-critical work involved.

Government Data · Government Data · Submitted Quotes (n=0)

How we got these numbers

National benchmark costs from RSMeans, Angi, Fixr, and HomeGuide are adjusted for Ohio using two federal datasets: the Bureau of Economic Analysis Regional Price Parity (RPP) index and the Bureau of Labor Statistics (BLS) Occupational Employment and Wage Statistics. Ohio's RPP is 0.9 (national baseline = 100) and its BLS labor adjustment factor is 0.93. Higher RPP means goods and services cost more relative to the national average; the BLS factor scales contractor labor rates to local wage levels. We blend these two adjustments, weighted 40% RPP, 60% BLS labor, to produce the ranges shown above.

adjusted_cost = national_benchmark × (0.4 × RPP/100 + 0.6 × bls_labor_adj)

RPP(Ohio) = 0.9 · BLS adj = 0.93

Full methodology →

What's included

Item	Qty	Unit Cost	Subtotal
Standby generator unit	1	$4,500	$4,500
Automatic transfer switch	1	$700	$700
Concrete pad and gas line	1 set	$1,200	$1,200
Permit and inspection	1	$400	$400
Materials Total			$6,800

Tools you'll need

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TOOLS YOU PROBABLY OWN

TOOLS TO RENT OR BUY

Licensed electrician (required)
Panel and transfer switch wiring must be licensed
Licensed gas fitter (required)
Gas line sizing and connection
Permit and inspection
Required by code in nearly all areas

Build sequence

1
An installer sizes the generator to your home's load and pulls permits.
COMMON MISTAKE
Undersizing leaves you unable to run key circuits during an outage.
2
A concrete or composite pad is set on level ground near the gas meter and panel.
3
A licensed gas fitter runs and sizes the gas line to the unit.
COMMON MISTAKE
An undersized gas line starves the generator under load.
4
An electrician wires the automatic transfer switch into the panel.
COMMON MISTAKE
Improper transfer switch wiring can backfeed and endanger utility crews.
5
The system is inspected, then tested under load and set to self-test weekly.

Permits and code requirements

PERMIT REQUIREMENTS

Permit rules for whole-house generator vary by city and county in Ohio. Most structural, electrical, plumbing, or mechanical work needs a permit and an inspection. Confirm with your local building department, or see the Ohio guide for specifics.

PERMIT THRESHOLD

Varies by municipality

Disclaimer: Always verify permit requirements with your local building department before starting work. Requirements vary by municipality and are updated periodically.

Frequently asked questions

NEXT STEPS

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UPDATED JUNE 2026