If your goal is reliable backup power for outages, a permanently installed standby generator is the most complete solution. It starts automatically, powers selected circuits or the whole home, and keeps running as long as fuel is available.
In the Seattle area, homeowners usually spend $7,500 to $16,000 for a finished generator project. Small essential-load projects can land lower. Full-home, high-capacity systems with complex gas runs land higher.
Typical Cost Ranges in King County
- $7,500 to $10,500: 10kW-14kW system for essential circuits with straightforward access
- $10,500 to $13,500: 16kW-20kW system for broader home coverage
- $13,500 to $16,000+: 22kW whole-home style systems with longer gas and electrical runs
Important: the generator unit itself is only part of the budget. Transfer switch work, permitting, gas connection scope, and commissioning are often 40 to 60 percent of the total project cost.
What Is Included in a Professional Installation
- Load review and equipment sizing
- Automatic transfer switch installation
- Electrical interconnection to panel and service equipment
- Permit and final inspection coordination
- System startup and operational testing
What Drives the Price Up
1) Gas line complexity
Distance from meter, trenching, and routing constraints can materially increase scope.
2) Transfer switch strategy
Whole-home transfer approaches generally cost more than selected-load setups.
3) Site layout and access
Tight side yards, longer feeder runs, and difficult mounting locations add labor and materials.
4) Electrical service condition
If your panel is outdated or full, related upgrades may be required before generator integration.
Generator vs Battery Backup Cost
Battery systems can be quieter and cleaner for short outages, but for long multi-day events generators often provide longer practical runtime per dollar when fuel supply is stable. Many homeowners compare both before deciding.
Do You Need a Permit?
Yes. Electrical permits are required, and inspections verify safe transfer operation and code compliance. In many cases you also coordinate additional scope for fuel and equipment siting requirements.
How to Get an Accurate Quote
The fastest path is a site assessment with these details:
- Square footage and major loads you want backed up
- Current panel capacity and condition
- Preferred generator location
- Gas meter location and path to generator pad
If you are planning generator work in Newcastle, Renton, Bellevue, Issaquah, or Kirkland, call or text (425) 312-8095 for a direct estimate.