Whole House Generator Cost: Complete Pricing and Installation Guide
HomeGuide puts the average installed cost of a whole house generator at $6,000 to $11,000. Fixr gives a higher national average, at $10,000 to $20,000.
Whole house generator cost breakdown
Each row shows one published figure, its scope (unit or installed), and its source.
| Item | Cost | Scope | Source |
|---|---|---|---|
| Generator for a 1,500-square-foot home | $4,000 to $5,500 | Generator price | Forbes Home |
| Whole-house models in Consumer Reports ratings | $3,400 to nearly $7,000 | Unit | Consumer Reports |
| 18kW generator for a 2,000 sq. ft. home | $15,000 | Installed | Fixr |
| Whole house generator, average | $6,000 to $11,000 | Installed | HomeGuide |
| Whole house generator, national average | $10,000 to $20,000 | Average | Fixr |
Fixr says most people spend around $15,000 on an 18kW generator for a 2,000 sq. ft. home. That capacity can run heating, cooling, hot water, lighting and appliances. Consumer Reports says its ratings include models from $3,400 to nearly $7,000, and those are unit prices.
Labor vs. materials
Forbes Home lists labor costs of $1,500 to $5,000 to install a whole-house generator. HomeGuide puts electrician rates at $50 to $130 per hour for wiring and for hooking a backup generator into the panel.
If an existing breaker box cannot support the added electrical load, an electrical panel upgrade may be needed before installation begins. Homeowners can review the electrical cost guides for wiring and service upgrade pricing.
Additional installation components
Connecting standby equipment requires dedicated hardware to switch power sources safely. HomeGuide puts transfer switch installation at $400 to $2,500 on average. Fixr’s range is higher, at roughly $2,700 to $3,700 including the switch, wiring and labor.
Mounting pads and dedicated wiring also add to the total. HomeGuide lists a pre-cast concrete pad of 3 to 4 inches thick at $150 to $400 for a generator. Bob Vila puts a dedicated circuit at about $500 to $1,000.
Permit fees are another possible expense; HomeGuide puts permits at $80 to $450 total on average.
Operating and maintenance costs
Extended power outages create ongoing fuel costs. HomeGuide puts running whole-home generators at $30 to $170 a day. Bob Vila’s figures put a 21 kW model on natural gas at about $90 a day, and a 20 kW unit on propane at about $220 a day.
Yearly upkeep is another recurring cost. HomeGuide puts annual maintenance at $200 to $650 per year, which covers a full inspection plus oil and filter changes.
DIY vs. hiring a pro
Installing a whole house generator is not a practical do-it-yourself project for homeowners. Connecting high-voltage electrical circuits and fuel lines carries substantial safety hazards. A licensed pro and a permit may be required by local building codes for electrical panel wiring and gas supply hookups.
Homeowners can manage tasks such as clearing the installation pathway and choosing an accessible equipment location. Professional electricians and gas technicians handle the heavy lifting, panel integration, and municipal inspections.
Ways to save
Homeowners can take several practical steps to manage overall generator expenses.
- Gather written quotes from multiple licensed electrical contractors to compare equipment sizing, transfer switch models, and labor rates.
- Place the generator near the existing electrical panel and gas meter.
- Prepare the ground and clear shrubs or debris around the installation zone before contractor crews arrive on site.
- Verify whether existing fuel supply lines provide adequate pressure before ordering equipment.
How to get an accurate quote
An accurate estimate should include an in-person site visit by a licensed contractor. Electricians should check your main panel capacity, fuel supply pressure, and the distance between utility hookups and the generator pad.
When reviewing written proposals, confirm that the quote specifies the generator brand, kilowatt rating, and transfer switch specifications. The scope of work should explicitly detail trenching, concrete pad placement, municipal permit acquisition, and final electrical testing. Request itemized pricing for equipment, materials, and labor so you can compare bids directly.
What changes the price
- Generator capacity and total household wattage demand
- Fuel type and proximity to existing gas or fuel lines
- Transfer switch type and electrical panel compatibility
- Site preparation and concrete mounting pad requirements
- Local municipal building permit and inspection fees
Frequently asked questions
How long can a backup generator run without stopping?
HomeGuide says a whole-home generator can supply power for up to 500 hours of continuous running, or about three weeks.
What do contractors charge for a single generator service visit?
Bob Vila puts generator service at $80 to $300 per visit.
What are the typical annual fuel costs for a standby generator?
Fixr estimates yearly energy costs of $0 to $500, depending on how much you use the generator, fuel cost, and runtime.
What is the typical price to install a new transfer switch?
Forbes Home puts a new transfer switch installation at $800 to $2,000. The final price tag depends on which type you choose.
Sources
Related cost guides
Figures are estimates based on the sources above and vary by region, home and contractor. Get at least three written quotes before you hire. See our disclaimer and how we research.