Power outages have become more frequent and longer-lasting in many parts of the country. Severe weather events, aging grid infrastructure, and increased demand on electrical systems have made reliable backup power a priority for homeowners. A whole-house standby generator automatically detects a power outage and kicks in within seconds, keeping your lights, HVAC system, refrigerator, sump pump, and other essential systems running until utility power is restored.
Unlike portable generators that power only a few circuits and require manual setup during an outage, standby generators are permanently installed outside your home and connected to your electrical panel through an automatic transfer switch. They run on natural gas or propane, eliminating the need to store gasoline. This convenience and reliability comes at a higher price point, but for many homeowners the investment pays for itself in peace of mind, food preservation, and protection against frozen pipes and flooded basements.
Whole-house generators are sized by their power output in kilowatts. The right size for your home depends on what you want to power during an outage. Here is a breakdown of typical equipment costs in 2026.
Small generators in the 10 to 14 kilowatt range cost between $3,500 and $5,500 for the unit itself. These are sufficient for covering essential circuits including the refrigerator, a few lights, the sump pump, and a gas furnace. They will not run your central air conditioning or electric range simultaneously.
Mid-range generators of 16 to 22 kilowatts cost between $5,000 and $8,500. This is the most popular size range for average homes. A 22-kilowatt unit can power most of a 2,500-square-foot home including central air conditioning, making it a good choice for homeowners who want near-normal comfort during an extended outage.
Large generators of 24 to 48 kilowatts range from $8,000 to $18,000 or more. These are designed for larger homes with high electrical demands such as multiple HVAC zones, electric water heaters, pool equipment, or home workshops. Most residential installations do not require a generator this large unless the home exceeds 4,000 square feet or has significant electrical loads.
Installation is a significant portion of the total project cost and typically ranges from $3,000 to $8,000 depending on several factors. The major installation components include the concrete pad or gravel base where the generator sits, the automatic transfer switch that connects the generator to your electrical panel, gas line installation or extension from your existing natural gas or propane supply, electrical wiring between the generator and the transfer switch, and permitting and inspection fees.
Homes that already have natural gas service nearby typically have lower installation costs since the gas line extension is shorter. Propane installations require a dedicated propane tank, which adds $1,500 to $3,000 for the tank and its installation if you do not already have one. Some propane suppliers offer tank leasing programs that reduce the upfront cost in exchange for purchasing propane exclusively from that supplier.
The complexity of your electrical panel also affects installation cost. Older homes with outdated panels may need a panel upgrade to accommodate the transfer switch, adding $1,500 to $3,000 to the project. Homes with buried utility lines or limited access around the foundation may also incur additional labor costs.
When you combine equipment and installation, the total cost for a whole-house generator project in 2026 typically falls in these ranges. A small system covering essential circuits runs $7,000 to $12,000 total. A mid-range system powering most of the home costs $10,000 to $18,000. A large whole-home system for bigger properties ranges from $15,000 to $25,000 or more.
These figures include the generator, automatic transfer switch, installation labor, gas line work, concrete pad, and permitting. They do not include optional upgrades like remote monitoring systems, extended warranty coverage, or a propane tank if needed.
Standby generators require regular maintenance to ensure they start reliably when needed. Most manufacturers recommend professional maintenance once or twice per year, which typically costs $200 to $400 per visit. Maintenance includes oil and filter changes, spark plug inspection, battery testing, coolant checks for liquid-cooled models, and a full load test.
Fuel costs during operation vary depending on the generator size and fuel type. A 22-kilowatt generator running on natural gas at full load consumes roughly $3 to $5 per hour in fuel. During a typical outage where the generator cycles between partial and full load, actual fuel consumption is lower. For homeowners with propane, keeping the tank filled and ready adds an annual cost that varies by local propane prices.
Extended warranties beyond the standard 5-year coverage are available from most manufacturers and typically cost $500 to $1,500 for an additional 5 years. Given the complexity and cost of generator repairs, an extended warranty is often a worthwhile investment.
Several factors can push your project cost higher or lower than the averages listed above. Geographic location matters because labor rates and permitting requirements vary significantly by region. Generator placement distance from the gas line and electrical panel affects installation complexity. Local building codes may require specific setback distances from property lines, windows, and fresh air intakes, which can limit placement options and increase installation difficulty. Finally, demand surges after major storms often lead to longer wait times and higher prices, so installing during calm weather in spring or early summer typically offers the best pricing and availability.
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