Piped fuel
Natural Gas Whole-House Generator Cost
Estimate a natural-gas standby system while keeping generator, installation, fuel-line and utility-capacity work separate.
HomeGuide currently reports $6,000–$11,000 installed for a whole-house natural-gas generator. Its size-specific observations are $6,000–$10,000 for 13–16 kW, $7,000–$11,000 for 17–20 kW and $9,500–$24,000 for 22–25 kW. Meter, regulator and pipe capacity still require property-specific design.
What changes the result?
A useful calculation starts with the physical scope and the written commercial terms. These are the factors to make explicit:
- Generator's natural-gas output rating
- Meter, regulator and available pressure
- Pipe length, size and other gas loads
- Electrical transfer and load management
- Pad, permits and commissioning
Use one scope for every quote
Give each business the same information and ask it to resolve the same boundaries. That makes the totals more comparable and exposes work left as an allowance or exclusion.
- Obtain the exact full-load fuel demand
- Have utility and installer confirm capacity
- Measure new pipe and trench routes
- Separate generator, fuel and electrical quotes
Current natural-gas installed ranges
The wider large-system band demonstrates why a single national average cannot stand in for the property design.
- 13–16 kW: $6,000–$10,000 installed
- 17–20 kW: $7,000–$11,000 installed
- 22–25 kW: $9,500–$24,000 installed
Price the fuel route visibly
HomeGuide reports $15–$50 or more per foot for gas-line installation. The calculator applies that band only to the entered new line length. It does not size pipe or certify that the existing meter and regulator can supply the generator plus other appliances at the required pressure.
Compare the complete coordinated scope
Ask who obtains utility confirmation, performs gas work, installs transfer equipment, provides the pad, obtains permits and commissions the unit under load. The proposal should state the natural-gas rating because some dual-fuel models produce less power on natural gas than propane.
Questions people ask
How much does a natural-gas whole-house generator cost installed?
HomeGuide currently reports $6,000–$11,000 for many systems, with 22–25 kW projects reported at $9,500–$24,000.
How much does a new gas line add?
Current planning evidence is $15–$50 or more per foot. Trenching, obstacles, pipe sizing, pressure and meter or regulator work can add more.
Can the existing gas meter supply a generator?
Do not assume it can. The utility or qualified fuel professional must check generator full-load demand plus simultaneous building loads, pressure and service capacity.
Does a dual-fuel generator have the same kW on both fuels?
Not always. Use the exact model's separate natural-gas and propane ratings when sizing and comparing proposals.
Method and sources
The model is a planning tool, not a quotation. These are the published sources used for this page; read the full assumptions before relying on a range. Source review: 14 September 2026.
- HomeGuide natural-gas generator cost guide
Current installed ranges by size and natural-gas project components; reviewed 14 September 2026.
- Generac 22 kW product page
Current example of separate propane and natural-gas capacity and consumption ratings; reviewed 14 September 2026.