Home generator planning library
Whole-House Generator Cost and Sizing Guides
Size essential loads, compare standby-generator installation scope and estimate the ownership costs that continue after commissioning.
Size the system
Match capacity to the loads you intend to support
Use load information—not house size alone—to screen common generator capacities before an on-site electrical and fuel assessment.
What Size Whole-House Generator Do I Need?
Plan essential, managed or whole-home backup from actual running and starting loads rather than square footage alone.
Sources reviewed 21 September 2026Capacity pricesWhole-House Generator Cost by Size: 14–26 kW Compared
Compare current 14, 18, 20, 22, 24 and 26 kW equipment evidence, then add transfer, fuel, electrical, pad and permit scope.
Sources reviewed 20 September 2026Home-size scenarioWhole-House Generator Cost for a 2,000 Sq Ft Home
Price a 2,000-square-foot home scenario without pretending floor area determines generator capacity.
Sources reviewed 2 October 2026Large-home standby powerWhole-House Generator Cost for a 3,000 Sq Ft Home
Build a 3,000-square-foot home standby-generator budget without sizing the system from floor area alone.
Sources reviewed 19 September 202614 kW standby power14 kW Whole-House Generator Cost: Equipment and Installation
Price a 14 kW standby-generator scenario while keeping transfer, fuel, electrical, pad and permit work visible.
Sources reviewed 18 September 202618 kW standby power18 kW Whole-House Generator Cost: Equipment and Installation
Price an 18 kW standby-generator scenario with the transfer, fuel, electrical, pad and permit scope left visible.
Sources reviewed 5 October 202620 kW standby power20 kW Whole-House Generator Cost: 2026 Installed Estimate
Estimate a 20 kW standby-generator project with equipment, installation, transfer, fuel, pad and permit scope shown separately.
Sources reviewed 20 September 2026Popular capacity22 kW Whole-House Generator Cost: Equipment and Installation
Separate a 22 kW generator package from fuel, electrical, placement and permit work before comparing installed quotes.
Sources reviewed 16 September 202624 kW standby power24 kW Whole-House Generator Cost: Unit and Installation
Estimate a 24 kW standby-generator project while keeping the unit, transfer switch, fuel, electrical, pad and permit scope separate.
Sources reviewed 19 September 2026Large air-cooled standby26 kW Whole-House Generator Cost: Unit and Installation
Separate current 26 kW equipment pricing from transfer, fuel, electrical, site and permit work before comparing installed proposals.
Sources reviewed 17 September 2026Install the system
Price equipment, transfer, fuel and site work
Separate the generator from electrical, gas or propane, permitting, pad, access and commissioning work.
Generator Installation Cost Calculator: Labor & Project Scope
Calculate a complete standby-generator installation budget, separating equipment, labor, transfer switch, fuel, electrical, pad and permit scope.
Sources reviewed 14 September 2026Complete systemStandby Generator Cost: Equipment and Installation
Compare complete permanently installed standby systems rather than unit-only prices or ambiguous installation averages.
Sources reviewed 14 September 2026Electrical scopeAutomatic Transfer Switch Installation Cost
Compare automatic and manual transfer equipment, service ratings, panel work and load-management scope.
Sources reviewed 14 September 2026Brand planningGenerac Generator Installation Cost
Separate current Generac generator-only MSRP, transfer-switch packages and property-specific installation work.
Sources reviewed 14 September 2026Piped fuelNatural Gas Whole-House Generator Cost
Estimate a natural-gas standby system while keeping generator, installation, fuel-line and utility-capacity work separate.
Sources reviewed 14 September 2026Stored fuelWhole-House Propane Generator Cost
Build a propane standby-generator budget that separates the unit, tank, piping, electrical work and usable outage fuel.
Sources reviewed 14 September 2026Own the system
Plan running, maintenance and repair costs
Compare portable and standby approaches, then budget for fuel, scheduled service and fault diagnosis.
Generator Running Cost: Natural Gas and Propane
Calculate outage fuel cost from the exact model's consumption table, expected load, runtime and current local tariff.
Sources reviewed 14 September 2026Recurring serviceWhole-House Generator Maintenance Cost
Plan annual standby-generator service, consumables, testing and warranty requirements separately from repairs.
Sources reviewed 14 September 2026Backup optionsPortable vs Standby Generator Cost
Compare equipment, safe electrical connection, operating effort and coverage rather than only the generator purchase price.
Sources reviewed 14 September 2026Fault diagnosisGenerator Repair Cost: Minor and Major Repairs
Plan generator diagnosis and repair by component while keeping annual maintenance, emergency callout and full replacement separate.
Sources reviewed 14 September 2026