Generator Cost by Size (2025 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.
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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
~5% market$3,500 - $10,000
Pros:
- ✓Budget-friendly
- ✓Good value
- ✓Reliable performance
Cons:
- −Less premium feel
- −Fewer features
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.
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.
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