Whole-House Generator Installation Cost in 2026: $7,000-$20,000
If you’re budgeting a whole-house generator installation, most projects run $7,000-$20,000, with the national average around $12,000. What moves that number most is usually one thing: Generator Size (kW) and Coverage. On its own it can swing the cost by $2,000 - $15,000, so that’s the decision to slow down on before you sweat the smaller stuff.
Easiest place to save: Size to essential loads only - an 11-14 kW generator protecting your critical circuits (refrigerator, sump pump, heat, lights, and outlets) costs $4,000-$7,000 less than a whole-house unit and handles 90% of outages perfectly well.
Whole-House Generator Installation Cost Calculator
Use our interactive cost estimator to get a personalized estimate for your specific project size, quality, and location.
Cost Breakdown by Tier
| Line Item | Low | Mid | High |
|---|---|---|---|
| Cost per unit | $3500 | $12000 | $20000 |
| Materials | $4,000 | $7,000 | $15,000 |
| Labor | $2,500 | $4,000 | $7,000 |
| Permits | $800 | $1,200 | $2,000 |
| Total | $7,300 | $12,200 | $24,000 |
Budget
10-14 kW air-cooled standby generator, 100-amp transfer switch, existing gas line
Mid-Range
20 kW air-cooled, 200-amp automatic transfer switch, new gas line run
Premium
22+ kW liquid-cooled, whole-house coverage, extended gas line, load management
What Drives the Cost
Generator Size (kW) and Coverage
$2,000 - $15,000Sizing a generator starts with what you want to power. Essential loads (refrigerator, sump pump, lights, outlets) need 10-14 kW. Powering the HVAC adds 5-8 kW. Whole-house coverage including electric range and EV charger may require 22-40 kW. Each additional kW of capacity adds $200-$500 in equipment cost. Oversizing is common and expensive - do a load calculation first.
Fuel Type: Natural Gas vs. Propane vs. Diesel
$500 - $3,000Natural gas generators connect to your existing utility line - no storage needed, the fuel supply is automatic. Propane requires a 500-1,000 gallon tank ($1,000-$2,500 installed) but works where natural gas is unavailable. Diesel is more fuel-efficient but requires on-site storage and regular fuel maintenance. Natural gas is the most convenient for standby use.
Transfer Switch Type and Amperage
$500 - $3,000A manual transfer switch ($300-$500) requires you to manually switch to generator power. An automatic transfer switch (ATS) detects an outage and switches within seconds - the standard for whole-house generators. A 100-amp ATS costs $500-$900; a 200-amp ATS costs $800-$1,500. Whole-home coverage requires a 200-amp switch matched to your panel size.
Gas Line Installation
$300 - $3,000If your existing gas line reaches the generator location (within 20-30 feet), connection is straightforward ($300-$600). Longer runs through finished areas or underground add significant cost - $15-$30 per linear foot for underground installation. Homes with propane must budget for a new or enlarged tank. Gas pressure may need a regulator upgrade for larger generators.
Concrete Pad and Permanent Installation
$300 - $1,500Standby generators require a permanent concrete pad (minimum 2-3 inches thick) sized to the unit. A standard 10-14 kW pad costs $300-$600 installed. Larger units need bigger pads ($500-$1,000). The generator must be placed at least 5 feet from windows, doors, and gas meters - constraints that can add gas line length. Some HOAs require screening.
Cost by Material or Type
| Material | Cost/Unit | Best For |
|---|---|---|
| 10-14 kW Air-Cooled Standby (Generac, Kohler) | $4,000 - $8,000 installed | Homeowners wanting essential protection without full-house coverage, budgets under $10,000Powers essential loads, most affordable standby option, widely available service |
| 20-22 kW Air-Cooled Standby | $8,000 - $15,000 installed | Most single-family homes under 3,500 sq ft, best value for near-whole-house coverageHandles most whole-house loads including HVAC, widely available, good balance of cost and coverage |
| Liquid-Cooled Standby (22+ kW) | $15,000 - $35,000 installed | Large homes, all-electric homes, homeowners in frequent-outage areas, commercial applicationsTrue whole-house coverage, quieter than air-cooled, longer lifespan (20,000+ hours), commercial-grade |
| Portable Generator + Transfer Switch | $1,500 - $4,000 installed | Occasional outages, budgets under $5,000, renters, vacation propertiesMuch lower cost, portable for other uses, no permanent installation permits in some areas |
| Propane-Fueled Standby | $7,000 - $20,000 installed (plus tank) | Rural homes without natural gas service, areas with frequent and prolonged outagesWorks where natural gas is unavailable, cleaner burning than diesel, automatic operation |
Regional Cost Variations
Labor rates and material costs vary significantly by region. Apply these multipliers to the national average to estimate costs in your area.
| Region | Adjustment | Est. Average |
|---|---|---|
| Northeast | +15% to +25% | $13,800 - $15,000 |
| West Coast | +20% to +32% | $14,400 - $15,840 |
| Southeast | -14% to -8% | $10,320 - $11,040 |
| Midwest | -16% to -8% | $10,080 - $11,040 |
| Mountain West | +5% to +12% | $12,600 - $13,440 |
Timeline & What to Expect
DIY vs. Professional
Good for DIY
- Preparing the generator pad location (grading and forming)
- Researching load requirements and choosing generator size
- Clearing brush and obstacles from the installation site
- Scheduling and coordinating the permit and utility notification process
Potential savings: 10-20% ($800-$2,000)
Hire a Pro
- Transfer switch installation and electrical connections (licensed electrician required)
- Gas line connections and pressure testing (licensed plumber or gas contractor required)
- Permit applications and inspection scheduling
- Generator commissioning and load testing
- Utility notification and coordination
DIY feasibility: Not Recommended - requires licensed electrician for transfer switch, licensed gas contractor for fuel connections, and permits are mandatory in virtually all jurisdictions
Risk warning: Transfer switch wiring errors can energize utility lines during an outage, which has killed utility workers and is a federal crime in some states. Gas leaks from improper connections are a fire and explosion hazard. Permits are required in virtually all jurisdictions - unpermitted generator installs are a major red flag at home resale and may void homeowner's insurance.
How to Save Money
Size to essential loads only - an 11-14 kW generator protecting your critical circuits (refrigerator, sump pump, heat, lights, and outlets) costs $4,000-$7,000 less than a whole-house unit and handles 90% of outages perfectly well.
Get quotes in fall or spring, not during or immediately after a storm season - post-hurricane demand spikes prices 20-40% and extends lead times for months.
Propane vs. natural gas: if you already have propane on-site for a different appliance, ask for quotes on both fuel types. Propane generators are often $500-$1,000 cheaper in upfront equipment cost.
Annual maintenance (oil change, spark plugs, battery test) runs $150-$300 and is non-negotiable - a generator that fails to start during an outage is a complete waste. Budget for it.
Check with your homeowner's insurance - many insurers offer a small discount for homes with whole-house generators, and some policies cover generator damage in storms.
Manufacturer rebates are common in the spring: Generac, Kohler, and Briggs and Stratton periodically offer $300-$800 rebates through authorized dealers.
Questions to Ask Your Contractor
“Have you performed a load calculation to size this generator correctly?”
Why this matters: Oversized generators are the most common waste of money in this category. A contractor who recommends the biggest unit without a load calculation is selling, not advising.
“What type of transfer switch are you recommending - automatic or manual?”
Why this matters: For whole-house standby use, automatic is the right answer in almost every case. A manual transfer switch defeats the main benefit of a standby generator.
“What is the expected annual maintenance cost, and do you offer a service contract?”
Why this matters: A generator that is not maintained is unreliable. Generators need oil changes, battery replacements, and regular test runs. A service contract ($150-$300/year) ensures this gets done.
“What permits are required, and will you handle the utility notification?”
Why this matters: Utilities must be notified before connecting a standby generator - failure to do so is a safety violation. A contractor who doesn't mention this step may not be handling it.
Whole-House Generator Installation Cost by City
The same job does not cost the same everywhere, and labor is most of why. Prices below scale this project’s own labor share by each metro’s actual HVAC technician wage from the BLS Occupational Employment and Wage Statistics (May 2025), with a lighter adjustment for materials and permits. Ranked most expensive first, against a $12,000 national average.
| Metro | Typical range | vs. national |
|---|---|---|
| San Francisco, CA | $9,058-$25,880 | +29% |
| San Jose, CA | $8,807-$25,162 | +26% |
| New York City, NY | $8,515-$24,330 | +22% |
| Seattle, WA | $8,369-$23,910 | +20% |
| Boston, MA | $8,280-$23,656 | +18% |
| Los Angeles, CA | $8,176-$23,359 | +17% |
| San Diego, CA | $8,220-$23,486 | +17% |
| Chicago, IL | $7,923-$22,637 | +13% |
| Hartford, CT | $7,779-$22,226 | +11% |
| Philadelphia, PA | $7,687-$21,964 | +10% |
| Portland, OR | $7,700-$22,001 | +10% |
| Baltimore, MD | $7,625-$21,786 | +9% |
| Denver, CO | $7,609-$21,740 | +9% |
| Providence, RI | $7,568-$21,622 | +8% |
| Sacramento, CA | $7,594-$21,696 | +8% |
| Minneapolis, MN | $7,506-$21,447 | +7% |
| Buffalo, NY | $7,211-$20,604 | +3% |
| Salt Lake City, UT | $7,123-$20,350 | +2% |
| Austin, TX | $7,093-$20,265 | +1% |
| Pittsburgh, PA | $7,043-$20,124 | +1% |
| Boise, ID | $6,994-$19,984 | 0% |
| Miami, FL | $7,033-$20,095 | 0% |
| Las Vegas, NV | $6,923-$19,781 | -1% |
| Virginia Beach, VA | $6,907-$19,733 | -1% |
| Columbus, OH | $6,843-$19,551 | -2% |
| Indianapolis, IN | $6,770-$19,342 | -3% |
| Nashville, TN | $6,757-$19,306 | -3% |
| Phoenix, AZ | $6,794-$19,410 | -3% |
| St. Louis, MO | $6,818-$19,481 | -3% |
| Cincinnati, OH | $6,728-$19,222 | -4% |
| Cleveland, OH | $6,735-$19,242 | -4% |
| Dallas, TX | $6,730-$19,228 | -4% |
| Detroit, MI | $6,702-$19,149 | -4% |
| Kansas City, MO | $6,714-$19,182 | -4% |
| Charlotte, NC | $6,645-$18,986 | -5% |
| Houston, TX | $6,660-$19,028 | -5% |
| Richmond, VA | $6,620-$18,915 | -5% |
| Atlanta, GA | $6,614-$18,898 | -6% |
| Jacksonville, FL | $6,583-$18,809 | -6% |
| New Orleans, LA | $6,583-$18,808 | -6% |
| Oklahoma City, OK | $6,552-$18,720 | -6% |
| Raleigh, NC | $6,548-$18,708 | -6% |
| San Antonio, TX | $6,546-$18,703 | -6% |
| Tampa, FL | $6,559-$18,739 | -6% |
| Albuquerque, NM | $6,540-$18,685 | -7% |
| Louisville, KY | $6,527-$18,649 | -7% |
| Tucson, AZ | $6,531-$18,660 | -7% |
| Memphis, TN | $6,416-$18,330 | -8% |
| El Paso, TX | $6,191-$17,689 | -12% |
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Sources & Methodology
National ranges are compiled from published industry cost guidance; the pricing for your metro is computed from BLS wage data for the trade this project depends on. See our full methodology for how we build and localize these numbers.
- HomeAdvisor - Whole House Generator Cost (2025)
- Generac - Standby Generator Sizing Guide (2025)
Quick Answer
National Average
$12,000
Typical Range
$7,000 - $20,000
Low End
$3,500
High End
$35,000
Cost Per unit
$3500 - $20000