The total house generator cost in 2026 runs from $500 for a basic portable to $22,000 for a fully installed whole-house standby generator. The price you pay depends on what you're trying to back up, which fuel source you have, and whether you need automatic switchover.
House Generator Cost at a Glance
| Type | Unit cost | Installed cost | Best for |
|---|---|---|---|
| Portable gas generator | $400–$2,000 | $500–$2,800 | Short outages, essentials only |
| Portable inverter generator | $700–$2,500 | $800–$2,800 | Quiet backup + sensitive electronics |
| Home standby (air-cooled) | $3,200–$7,500 | $7,500–$13,000 | Most single-family homes |
| Home standby (liquid-cooled) | $8,500–$15,000 | $15,000–$25,000 | Large homes, whole-house incl. multiple AC |
| Battery backup (e.g., Tesla Powerwall) | $12,000–$16,000 | $16,000–$22,000 | Solar-compatible, silent, limited runtime |
See What a Generator Costs in Your Area
Enter your ZIP code for instant pricing from licensed local installers.
What Drives House Generator Cost
1. Generator size (kW) — doubles roughly every 6–8 kW 2. Fuel type — natural gas cheapest to install when gas is available; propane adds tank cost; diesel cheaper per kW but harder to permit 3. Automatic vs manual transfer — ATS adds $600–$1,200 but switches power within 10 seconds of an outage 4. Sound dampening — enclosures rated at <65 dB add $400–$1,000 5. Brand and warranty — Generac, Kohler, Cummins, Briggs & Stratton all in similar price bands; warranty tiers are 2/5/10 years
House Generator Cost by Brand (2026)
| Brand | 14 kW installed | 22 kW installed | Warranty |
|---|---|---|---|
| Generac Guardian | $8,500–$11,000 | $11,000–$14,500 | 5-year |
| Kohler | $9,500–$12,500 | $12,500–$16,000 | 5-year |
| Cummins RS | $9,000–$12,000 | $12,000–$15,500 | 5-year |
| Briggs & Stratton | $8,000–$10,500 | $10,500–$13,500 | 3-year |
| Champion | $7,000–$9,500 | $9,500–$12,500 | 3-year |
Annual Operating Cost of a House Generator
- •Natural gas: ~$20–$40 per day of full-load runtime; ~$50–$150 per year in fuel for a typical household (30–60 outage hours)
- •Propane: ~$40–$90 per day full load; $150–$500 per year fuel
- •Diesel: ~$60–$120 per day; less common for residential
- •Maintenance: annual service runs $180–$400 (oil, filter, plug, test)
House Generator Cost vs. Value
For homeowners with frequent outages (Florida, Louisiana, parts of Texas, Northeast storm belt), a $12,000 standby generator typically pays back in avoided food loss, hotel stays, and sump/medical continuity within 3–6 years. Insurance discounts (3–10% on homeowners) add to the return.
See What a Generator Costs in Your Area
Enter your ZIP code for instant pricing from licensed local installers.
Frequently Asked Questions
How much does a house generator cost?
In 2026, a house standby generator costs $7,500–$15,000 installed for most single-family homes. Portable house generators start at around $500 for basic units and go up to $2,800 for a portable inverter with an installed inlet box.
Is a house generator worth the cost?
For homeowners with frequent or multi-day outages, a standby generator usually pays back within 3–6 seasons through avoided food loss, sump/medical continuity, and insurance discounts. For areas with rare outages, a portable unit delivers most of the value at 10–20% of the cost.
What size house generator do I need?
Most 1,500–2,500 sq ft homes need 14–18 kW for essential-circuit backup and 20–22 kW for whole-house coverage including central AC. Larger homes with multiple AC units need 24–38 kW.
How much does it cost to run a whole-house generator per day?
About $20–$40 per day on natural gas, $40–$100 per day on propane. Most homeowners run their generator 30–80 hours per year, so annual fuel costs are minor compared to the install.
Can I finance a house generator?
Yes. Most installers offer 12–84 month financing through partners like Synchrony or Greensky, with rates between 0% promotional and 12% APR depending on credit. Some utility companies offer on-bill financing for standby generators in hurricane zones.
For state-specific pricing information, see our detailed breakdown of Illinois whole house generator costs which includes local installation factors and permits.
For state-specific pricing information, our detailed breakdown of [North Carolina generator costs](/resources/whole-house-generator-cost-north-carolina) provides local installation rates and regional factors.
For state-specific pricing information, see our detailed breakdown of whole house generator cost Idaho to understand regional variations in pricing and installation requirements.
Fuel type significantly impacts both upfront and ongoing costs, which is why we've created a detailed [diesel vs gas generator guide](/resources/diesel-vs-gas-generator-home) to help you make the right choice for your home.
Regional pricing can vary significantly based on local installation rates and permit requirements - for state-specific information, see our detailed breakdown of [whole house generator costs in North Dakota](/resources/whole-house-generator-cost-north-dakota).
While generators offer reliable backup power, it's worth exploring our [generator vs alternative solutions](/resources/generator-vs-alternative-solutions-comparisons-solar-battery-backup-portable-generators) guide to understand how solar battery systems compare in terms of long-term costs and benefits.
For state-specific pricing information, see our detailed breakdown of Rhode Island generator costs and local installation factors.
Get Your Free Generator Quote
See real pricing from licensed installers in your area. No obligation, no pressure.
GeneratorPrice Editorial Team
Our editorial team researches and writes every article with input from licensed generator installers, electricians, and industry professionals. We are committed to providing accurate, unbiased information to help homeowners make informed decisions about backup power.