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Free standby generator installation cost calculator for residential projects. Estimate typical installed cost bands by kW rating, fuel source, transfer switch approach, electrical service scope, pad and trenching, and regional labor.
Last updated: April 19, 2026
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Whole-home standby sizes vary; confirm loads with an electrician.
Typical project window
0.9 weeks
Utility gas meter work, inspections, and stock can extend lead times.
Notes
Demand
Load calc
HVAC, well pumps, and electric ranges drive generator size—confirm with calculations.
Piping
Regulators
Natural gas requires adequate pressure and sizing; propane may need tank upgrades.
Safety
NEC interlock
Proper transfer prevents backfeed to utility lines—installation must be code-compliant.
Upgrade
Amps & grounding
Older homes may need service entrance work to support ATS and startup inrush.
Placement
Setbacks
Concrete pads, conduit runs, and landscaping restoration vary by lot.
Commission
Load test
Manufacturers may require certified startup for full warranty coverage.
22 kW • natural gas • automatic transfer • panel OK • new pad • South:
Materials
$8,310
Labor
$7,949
Permits & fees
$1,807
Total
$18,066
The calculator applies an illustrative equipment-and-transfer band scaled by kW rating, adjusts for fuel type and automatic transfer equipment, adds optional service upgrade and site-work allowances, and applies a regional labor multiplier. The total is split across generator and electrical materials, installation and commissioning labor, and permits or fees. Gas line trench footage, premium brands, and engineering stamps are not itemized separately.
Core ≈ (kW band × fuel × transfer) + upgrades+ site work; × regionUse results for early budgeting—confirm with licensed electrical and gas contractors.
NEC, local amendments, and utility interconnection rules govern safe installation
Upgrading service? See our electrical panel upgrade calculator and solar panel installation calculator.
Get a custom calculator for your platformTotal illustrative estimate: $18,066
Typical project window: 0.9 weeks (utility dependent)
New main feeder and panel coordination
Often a major line item beyond the generator package
Tank size, distance, and regulator work
Site-specific quotes vary widely
Share it with homeowners comparing standby backup quotes
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