Whole House Generator Cost
Estimate installed standby generator cost, including equipment, installation, ATS, and permits. Local labor and site conditions drive the biggest swings.
Inputs
Simple mode uses national averages. Advanced mode adds HVAC, panel, runtime, and site work options.
Estimated Total
Range estimateSend your request or a correction and we'll review it within 24 hours.
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How this calculator works
1) We map home size to a base generator size range. 2) Load level scales the recommended range. 3) Fuel type and installation complexity adjust equipment and labor costs. 4) ATS and permits are added as fixed allowances. 5) Advanced mode can apply local labor market adjustments.
Advanced mode adds HVAC inclusion, panel upgrades, runtime storage, and site work to better reflect real-world projects without turning the form into a full load study.
Installed cost by size (kW)
Assumes standard install, natural gas, ATS included, and national average permits.
Power size guide
- Up to 1,500 sq ft: 10-14 kW base
- 1,501-2,500 sq ft: 14-20 kW base
- 2,501-3,500 sq ft: 20-26 kW base
- 3,501-5,000 sq ft: 26-38 kW base
- 5,000+ sq ft: 38-48 kW base
Example estimate (using your inputs)
Key cost factors
- Generator size (kW) is the largest driver of equipment cost.
- Fuel type can shift pricing and installation complexity.
- Local labor rates change the installation portion of the budget.
- ATS and permit requirements add fixed costs.
- Longer wiring runs or panel work increase labor cost.
FAQ
How much does a whole house generator cost?
Most installed projects land in the $8,000 to $20,000+ range. Final price depends on generator size, fuel type, installation complexity, and permit requirements.
What is the installed cost for a 2,000 sq ft home?
Many 2,000 sq ft homes map to a 14-20 kW standby generator. Installed totals often fall in the mid four to low five figures depending on fuel type and site conditions.
Does this estimate include installation, transfer switch, and permits?
Yes. The calculator includes equipment, installation, ATS, and a basic permit/inspection allowance. Utility upgrades or gas line extensions are not included unless you enable them.
How do I choose the right generator size?
Use home size and load level as a shortcut. Essentials-only homes often need 10-14 kW, while full-home coverage with HVAC is commonly 20-26 kW.
Is natural gas cheaper than propane or diesel?
Natural gas units are often lower-cost to run and install. Propane and diesel typically cost more due to fuel storage and equipment differences.
Is this a final quote?
No. This is a planning estimate only. Local labor rates, site conditions, and brand choices can move the total up or down.