The Short Answer
A whole-house standby generator costs between $5,000 and $18,000 fully installed in 2026, with the average homeowner paying around $8,500–$10,500. The total depends on generator size, brand, fuel type, and local installation labor rates.
That price includes everything: the generator unit, automatic transfer switch, concrete pad, gas line connection, electrical work, permits, and labor. There are no hidden costs if you work with a reputable installer who provides a detailed written quote.
Cost Breakdown by Component
Understanding where your money goes helps you evaluate quotes and spot red flags:
Generator unit: $2,500–$8,000. This is the equipment itself. A 14 kW air-cooled Generac runs about $3,800, while a 24 kW unit costs around $5,500. Kohler units carry a 10–20% premium. Liquid-cooled generators for large homes (30+ kW) start around $7,000.
Automatic transfer switch: $500–$1,500. The ATS detects outages and starts the generator automatically. A 200-amp whole-house switch costs $800–$1,500. Essential-circuit switches with load management cost $500–$900.
Concrete pad: $200–$500. A level, stable mounting surface is required. Most installers pour a small concrete pad or use a pre-cast composite pad.
Electrical work: $800–$2,500. This covers wiring from the generator to your electrical panel, installing the transfer switch, and any panel upgrades needed. Older homes with outdated panels may need a full panel upgrade, adding $1,000–$2,500.
Gas line: $300–$1,500. Connecting to an existing natural gas line is relatively inexpensive ($300–$800). Running a new propane line from a tank costs $500–$1,000. Installing a new propane tank adds $1,500–$2,500.
Permits and inspections: $75–$500. Most jurisdictions require electrical and gas permits. Your installer should handle this.
Labor: $1,500–$3,500. Installation typically takes one to two days with a two-person crew. Labor rates vary by region.
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Cost by Generator Size
Here is what to expect based on the generator size your home needs:
- •10–14 kW (small home or essential circuits): $4,000–$6,500 installed
- •16–20 kW (medium home, whole-house): $6,000–$10,000 installed
- •22–26 kW (large home, whole-house): $9,000–$14,000 installed
- •30–48 kW (estate or heavy loads): $13,000–$20,000+ installed
Factors That Push Costs Higher
Several variables can move your project above the average:
Electrical panel upgrade. If your home has a Federal Pacific, Zinsco, or other recalled/outdated panel, it must be replaced before generator installation. This adds $2,000–$3,500.
Long gas line runs. If your gas meter or propane tank is far from the generator location, the additional piping adds $15–$25 per linear foot.
Difficult site conditions. Rocky soil, tight access, steep grades, or extensive landscaping that must be preserved all increase labor time and cost.
Coastal installations. Generators in salt-air environments need corrosion-resistant enclosures and marine-grade components, which add $300–$800 to the equipment cost.
Ongoing Costs
Your initial purchase is not the only expense. Budget for these annual costs:
Annual maintenance: $200–$400. A professional service visit includes oil and filter changes, spark plug replacement, battery check, and system testing. This is required to maintain your warranty.
Fuel for exercise cycles: $50–$150/year. Your generator runs for 15–20 minutes each week to stay lubricated and ready. This uses a small amount of fuel.
Extended warranty: $500–$1,200 one-time. Extending from the standard 5-year warranty to 7 or 10 years is recommended for most homeowners.
How 2026 Prices Compare to Previous Years
Generator prices have increased approximately 8% year-over-year due to supply chain pressures, increased demand, and rising labor costs. A generator that cost $7,500 installed in 2023 now costs approximately $9,000–$9,500 in 2026.
Prices tend to spike after major storms as demand surges and inventory tightens. The most stable pricing is from November through March, when installer demand is lower. Buying before hurricane season (January–April) gives you the best combination of pricing, availability, and scheduling.
How to Save Money
Get multiple quotes. Prices can vary 20–30% between installers for the same equipment. Always compare at least three written quotes.
Choose the right size. Do not oversize. If a 20 kW generator meets your needs, the jump to 24 kW adds $1,500–$2,500 with minimal benefit.
Consider essential-circuit coverage. A 14 kW generator covering critical loads costs $3,000–$5,000 less than a full whole-house system.
Take advantage of off-season pricing. Some installers offer 5–10% discounts during their slow season (October–February).
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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.