Generator Cost by Size (2026 Prices)
Generator size is measured in kilowatts (kW). The right size depends on your home's square footage and which appliances you want to power during an outage.
| Size | Home Size | Unit Cost | Install Cost | Total |
|---|---|---|---|---|
| 10-12 kW | < 2,000 sq ft | $3,000 - $5,000 | $3,000 - $5,000 | $6,000 - $10,000 |
| 16-18 kW | 2,000 - 2,500 sq ft | $4,500 - $6,500 | $4,000 - $6,000 | $8,500 - $12,500 |
| 20-22 kW | 2,500 - 3,500 sq ft | $5,500 - $7,500 | $5,000 - $7,000 | $10,500 - $14,500 |
| 24-26 kW | 3,500 - 5,000 sq ft | $6,500 - $9,000 | $6,000 - $8,000 | $12,500 - $17,000 |
| 36+ kW | 5,000+ sq ft | $10,000 - $15,000 | $8,000 - $12,000 | $18,000 - $27,000 |
* Prices are estimates and may vary by location, fuel type, and installation complexity.
Not Sure What Size You Need?
Use our free calculator to get a personalized recommendation based on your home.
Try the CalculatorInstallation Cost Breakdown
Installation typically costs $3,000 to $8,000 and includes several components beyond just labor. Here's what goes into the total:
| Item | Cost Range | Notes |
|---|---|---|
| Transfer switch | $500 - $1,500 | Automatic transfer switch recommended |
| Concrete pad | $200 - $500 | Required foundation for generator |
| Electrical work | $1,000 - $3,000 | Panel upgrades may be needed |
| Gas line installation | $500 - $2,000 | Distance from meter affects cost |
| Permits | $100 - $500 | Varies by municipality |
| Labor | $1,500 - $3,000 | Typically 1-2 day installation |
Generator Brands Compared
Generac dominates the residential market with about 75% market share, but Kohler and Cummins offer premium alternatives worth considering.
Generac
~75% market$3,000 - $12,000
Pros:
- ✓Largest dealer network
- ✓Best brand recognition
- ✓Most model options
Cons:
- −Higher maintenance needs
- −Can be louder than competitors
Kohler
~15% market$4,000 - $16,000
Pros:
- ✓Quieter operation
- ✓Longer lifespan
- ✓Premium build quality
Cons:
- −Higher upfront cost
- −Fewer dealers
Cummins
~5% market$5,000 - $14,000
Pros:
- ✓Industrial reliability
- ✓QuietConnect technology
- ✓Strong warranty
Cons:
- −Limited residential options
- −Smaller dealer network
Briggs & Stratton
~3% market$3,500 - $10,000
Pros:
- ✓Budget-friendly
- ✓Good value
- ✓Reliable performance
Cons:
- −Less premium feel
- −Company restructured in 2020
Champion
~2% market$2,000 - $8,000
Pros:
- ✓Most affordable option
- ✓Dual-fuel capable
- ✓Good warranty
Cons:
- −Smaller dealer network
- −Less proven long-term reliability
Want to know what real owners think? See our 2025 Brand Sentiment Report based on 1,300+ owner discussions.
What Real Owners Say About Costs
We analyzed thousands of owner discussions on Reddit to understand real-world pricing experiences. Here's what homeowners are saying:
“The Kohler is gonna be more expensive. But you have to remember you're getting something you want to work in an emergency. We have far better luck with our Kohlers than we do our Generac.”
“Can't speak about anything but my 12 year old 20kw Briggs. Installed with my electrician neighbor after Sandy. Poured a concrete pad for it. I service it every year. Oil and filter, air and prefilter and plugs.”
“A lot of my neighbors 'over sized' theirs—18-22k. The price was about $2k cheaper than everyone except the first guy last year. He had a $10k/22k Generac installed. It was a once a year price offer.”
“$900 for essentially a whole-house generator is a good deal, period. I paid $900 for a Champion refurb 4500/3500 watt inverter model 4-5 years ago and that was a good deal back then.”
Quotes sourced from public Reddit discussions. Minor edits for clarity. See our full owner sentiment analysis.
Operating Costs: What It Costs to Run
Beyond the purchase price, you'll pay for fuel when the generator runs and annual maintenance. Here's what to expect for a typical 20kW generator running during an outage:
| Fuel Type | Cost Per Day | Maintenance/Year | Notes |
|---|---|---|---|
| Natural Gas | $30 - $50 | $150 - $300 | Cheapest if you have a gas line |
| Propane | $50 - $80 | $200 - $400 | Requires tank rental ($50-150/yr) |
| Diesel | $70 - $120 | $250 - $500 | Best fuel efficiency, higher cost |
* Daily costs assume continuous operation during an outage. Most outages last 4-8 hours, so actual costs are typically lower. Annual maintenance includes oil changes, filter replacements, and inspections.
Factors That Affect Your Cost
Fuel Type
Natural gas is typically cheaper to install if you have a gas line. Propane requires a tank ($500-$3,000) but works anywhere. Diesel generators cost more upfront but offer better fuel efficiency.
Location
Labor costs vary significantly by region. Urban areas typically have higher installation costs. Distance from the gas meter and electrical panel affects material costs.
Electrical Panel
Older homes may need panel upgrades ($1,000-$3,000) to accommodate the generator. 200-amp service is typically required for larger generators.
Permit Requirements
Most jurisdictions require permits for generator installation. Costs range from $100-$500. Some areas have additional setback or noise requirements.
Generator Costs by Region
Installation costs vary significantly based on where you live. Labor rates, permit requirements, and even demand (storm-prone areas have more installers but also more competition for their time) all play a role.
Northeast
$12,000 - $20,000
Higher labor costs, strict permit requirements. Strong demand due to winter storms.
Southeast / Gulf
$10,000 - $18,000
High demand from hurricane season. More installers available but busy schedules.
Midwest
$9,000 - $15,000
Moderate labor costs. Propane more common in rural areas.
Southwest
$10,000 - $16,000
Lower demand, but extreme heat increases need for AC backup.
West Coast
$14,000 - $22,000
Highest labor costs. Wildfire risk driving increased demand.
Rural Areas
+$1,000 - $3,000
Travel fees for installers. Propane tank installation often required.
Check your area's specific power outage risk score to understand local conditions.
Real-World Pricing Examples
Here's what homeowners in different situations can expect to pay, based on typical installations:
2,500 sq ft home in Texas
$11,000 - $14,000Natural gas, 20kW Generac, existing 200A panel
Unit: $5,500 | Install: $4,500 | Permits: $200 | Gas line: $800
3,500 sq ft home in Florida
$16,000 - $20,000Propane, 22kW Kohler, hurricane zone
Unit: $8,000 | Install: $6,000 | Permits: $350 | Propane tank: $1,500
1,800 sq ft home in Ohio
$12,000 - $15,000Natural gas, 16kW Generac, panel upgrade needed
Unit: $4,500 | Install: $4,000 | Panel upgrade: $2,000 | Permits: $150
4,000 sq ft home in California
$18,000 - $24,000Natural gas, 24kW Kohler, Title 24 compliance
Unit: $9,000 | Install: $7,000 | Permits: $450 | Compliance: $1,500
Installation Timeline: What to Expect
From first call to running generator, most installations take 3-8 weeks. Here's the typical breakdown:
Initial consultation & quote
1-3 daysSite assessment, load calculation, and detailed quote
Permit application
1-4 weeksVaries by municipality; some same-day, others backlogged
Equipment ordering
1-2 weeksMost dealers stock common sizes; custom orders take longer
Site preparation
1 dayConcrete pad pour, trenching for gas/electric lines
Generator installation
1 dayUnit placement, transfer switch, electrical connections
Gas line connection
2-4 hoursOften done same day or requires separate gas company visit
Inspection & commissioning
1-3 daysFinal permit inspection, startup test, owner training
Pro tip: Start the process in spring or early summer to avoid the fall rush when storm season drives demand.
Permit Costs by State
Generator permits typically cost $75-$500 depending on your location. Some rural areas don't require permits at all.
| State/Region | Permit Cost | Notes |
|---|---|---|
| California | $250 - $500 | Title 24 compliance adds complexity |
| Florida | $150 - $400 | Wind load calculations may be required |
| Texas | $100 - $300 | Varies widely by municipality |
| New York | $200 - $450 | NYC permits significantly higher |
| Most other states | $75 - $250 | Rural areas often lower or exempt |
Your installer typically handles permit applications. Ask who files and whether the fee is included in your quote.
Financing Options: Monthly Payment Estimates
Most dealers offer financing. Here's what monthly payments look like for a typical installation:
$10,000 Installation
$185
per month (60 mo @ 7.9%)
$15,000 Installation
$277
per month (60 mo @ 7.9%)
$20,000 Installation
$369
per month (60 mo @ 7.9%)
Common Financing Options
- ✓0% promotional financing — Many dealers offer 12-24 months same-as-cash
- ✓Home equity line (HELOC) — Often lower rates (5-8%), interest may be tax-deductible
- ✓Personal loans — Rates vary (7-15%), no home equity required
- ✓Credit cards — Only if you can pay off quickly; high rates make this expensive
How to Save Money on Your Generator
💡Buy off-season
Generator prices and installation availability are best in spring and early summer, before storm season drives demand.
💡Get 3+ quotes
Installation costs vary significantly between contractors. Getting multiple quotes can save $1,000-$3,000.
💡Consider a smaller size
You may not need whole-house coverage. A 16kW unit powering essentials costs $4,000+ less than a 24kW system.
💡Bundle with electrical work
If you need a panel upgrade anyway, combining it with generator installation saves on labor costs.
💡Ask about financing
Many dealers offer 0% financing for 12-24 months, making the upfront cost more manageable.
💡Check for utility rebates
Some utilities offer rebates for standby generators, especially if you enroll in demand response programs.
Questions to Ask Before Hiring an Installer
Before signing a contract, make sure you get clear answers to these questions:
- 1What's included in the installation quote? (Ask for itemized breakdown)
- 2How long is the warranty, and what does it cover?
- 3Do you offer a maintenance contract? What does it include?
- 4What permits are required, and who handles them?
- 5How long will installation take from start to finish?
- 6What happens if there are unexpected costs during installation?
- 7Can you provide references from recent installations?
- 8What's the payment schedule? (Avoid paying 100% upfront)
Generator Lifespan & Return on Investment
How Long Do Generators Last?
A well-maintained standby generator lasts 20-30 years or 10,000-30,000 running hours. Most residential generators run 50-200 hours per year, so even with frequent outages, you're looking at decades of service.
Key maintenance: annual oil changes, air filter replacement, spark plug checks, and professional inspection every 2-3 years.
Is It Worth the Investment?
For a typical $12,000 installation lasting 25 years, you're paying about $480/year for peace of mind—less than $1.50/day.
A single extended outage can cost $500-$2,000+ in spoiled food, hotel stays, lost work, or frozen pipe repairs. Two or three bad outages and the generator has paid for itself.
Home value impact: Generators add 3-5% to home value in outage-prone areas, often recovering $5,000-$10,000 at resale.
Frequently Asked Questions
Is a whole house generator worth the cost?▼
For most homeowners, yes. A generator protects against food spoilage ($300-$500 per outage), prevents pipe freezing in winter (thousands in damage), and maintains home security systems. If you work from home or have medical equipment, the value is even higher. Most generators last 20-30 years with proper maintenance.
How long does installation take?▼
Most installations take 1-2 days once all permits are approved. The permit process can take 1-4 weeks depending on your municipality. From initial quote to running generator, expect 2-6 weeks total.
What are the ongoing costs?▼
Annual maintenance runs $200-$500 per year (oil changes, filter replacements, inspections). Fuel costs during outages depend on usage but typically $20-$50/day for natural gas. Extended warranties add $200-$500/year.
Can I install a generator myself?▼
Not recommended. Generator installation requires licensed electricians and often gas line work. Most jurisdictions require permits and inspections. DIY installation can void warranties and create serious safety hazards. Professional installation typically costs $3,000-$8,000.
Does a generator increase home value?▼
Yes, typically by 3-5% of the generator cost or $5,000-$10,000 in areas with frequent outages. In storm-prone regions like Florida and Texas, buyers increasingly expect backup power, making it a competitive advantage when selling.
How much does a Generac generator cost?▼
Generac home standby generators range from $3,000 to $12,000 for the unit alone, depending on size (7kW to 26kW). With installation, expect to pay $6,000 to $18,000 total. The most popular models (Guardian series 16-22kW) typically cost $10,000-$14,000 installed.
What size generator do I need for a 2,000 sq ft house?▼
Most 2,000 sq ft homes need a 16-20kW generator for whole-house coverage, including central AC. If you only want to power essentials (refrigerator, lights, some outlets), a 10-12kW unit may be sufficient. Use our sizing calculator for a personalized recommendation.
Is propane or natural gas cheaper for a generator?▼
Natural gas is typically 30-40% cheaper to run than propane. A 20kW generator costs about $30-50/day on natural gas vs. $50-80/day on propane. However, if you don't have a gas line, running one can cost $500-$2,000+, potentially offsetting the savings. Propane is the better choice for rural areas without natural gas access.
How long do whole house generators last?▼
With proper maintenance, standby generators last 20-30 years or 10,000-30,000 running hours. Most residential generators run 50-200 hours per year, so even with frequent outages, expect decades of reliable service. Key maintenance includes annual oil changes and professional inspections every 2-3 years.
How We Compiled This Data
The pricing data in this guide comes from multiple sources to ensure accuracy:
- 1Manufacturer MSRP data — Direct from Generac, Kohler, Cummins, Briggs & Stratton, and Champion published pricing
- 2Installer surveys — Conversations with certified installers across different regions
- 3Owner-reported costs — Analysis of 1,300+ discussions from r/Generator, r/homeimprovement, and r/preppers on Reddit
- 4Industry reports — Data from Home Advisor, Angi, and electrical contractor associations
Prices last verified February 2026. Actual costs vary based on location, installer, site conditions, and market fluctuations. This guide is for informational purposes only—always get multiple quotes for your specific situation.
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