The short answer: most Houston homeowners see installed quotes between $10,000 and $25,000 for a whole-house standby generator. Where you land depends on a handful of predictable things.
| Project | Typical scope | Where it lands |
|---|---|---|
| Essential circuits | Smaller air-cooled unit, sub-panel switch | Low end, sometimes under $10k |
| Whole home, typical house | Air-cooled unit around 20 to 26 kW, service-rated switch, load management | Middle of the range |
| Large or all-electric home | Bigger air-cooled or liquid-cooled unit, meter upgrade, long runs | High end and above |
These are planning ranges, not quotes. Only a site visit gets you a real price.
The five things that move the price
Generator size
Bigger kW costs more. Liquid-cooled costs a lot more. Size comes from a load calculation.
Transfer switch
Whole-home switches cost more than essentials switches. Load modules add cost but can save you a size step.
Gas supply
Long pipe runs and meter upgrades add up. Propane homes add a tank.
Electrical work
Old or full panels may need replacing. Long wire runs add labor.
Site and permits
Pads, trenching, raised platforms, permits and HOA screening.
Running costs
Budget for yearly maintenance, a battery every few years, and fuel during outages. Gas use depends on load and run time. Propane run time depends on tank size.
Financing
Many installers offer financing through outside lenders. Compare the APR and the total cost, not only the monthly payment.
Dig deeper
- Installation cost, line by line
- Generac cost factors
- Size calculator for your kW range
Get a real price
An independent local installer can quote your actual home.
Common questions
How much does a whole-house generator cost in Houston?
Installed systems commonly range from about $10,000 to $25,000. Essentials-only setups can cost less. Big liquid-cooled systems and complex installs can cost more.
Is the generator the biggest cost?
It’s usually the largest single item, but installation (gas, switch, electrical, pad, permits) is a big share and varies the most from home to home.