Complete Guide to Home Generator Installation — What to Expect
If you've been through a multi-day power outage in Grays Harbor or Thurston County, you've probably thought about getting a generator. Here's what the process actually looks like, what it costs, and what to consider before you call.
Portable vs. Standby — The Real Difference
A portable generator runs on gas, sits in your yard, and powers whatever you plug into it with extension cords. It works, but you have to start it manually, refuel it, and you typically can't run your entire house off it.
A standby generator is permanently installed next to your house, wired into your electrical panel through an automatic transfer switch. When the power drops, it starts itself. When power comes back, it switches off. No extension cords, no manual startup, no running outside in a storm to check on it.
For most homeowners who lose power regularly, a standby generator is the practical choice.
What Goes Into the Installation
A standby generator installation involves more than setting a box next to your house. Here's the actual scope:
Site assessment. An electrician evaluates your electrical panel, your fuel source (natural gas or propane), and where the generator can be placed. Placement matters — generators need clearance from windows, doors, and property lines per code.
Equipment. The generator unit itself, plus an automatic transfer switch. The transfer switch is what connects the generator to your panel and handles the switchover.
Concrete pad. The generator sits on a level concrete or composite pad. This keeps it off the ground and stable.
Fuel connection. If you're on natural gas, the gas line needs to be sized for the generator's demand — your existing gas line may not be large enough. If you're on propane, you'll need a tank (typically 250-500 gallon depending on the generator size and how long you want to run it).
Electrical work. Wiring from the generator to the transfer switch, transfer switch to the panel, and any panel upgrades needed to support the new load.
Permits and inspection. In Washington, electrical permits are required. Depending on where you live, the permit comes from your city (Aberdeen, Olympia, and Lacey run their own programs) or from the state Department of Labor & Industries.
Sizing — How Big Do You Need?
The answer depends on what you want to keep running during an outage.
Essentials only (10-14 kW): Lights, refrigerator, furnace blower, sump pump, a few outlets, garage door opener. This covers the basics and is the most affordable option.
Most of the house (16-22 kW): Everything above plus kitchen appliances, well pump, multiple bathroom circuits, home office, washer/dryer. This is the most common size for a family home.
Whole house (22+ kW): Everything. Electric range, heat pump, central AC, shop tools, hot tub. If you want to not notice the outage at all, this is the range.
An electrician should do a load calculation based on your actual panel and usage — not just recommend the biggest unit available.
What It Costs
Generator installations vary widely. A rough range for residential:
Equipment: $3,000–$8,000+ for the generator unit (size and brand dependent)
Transfer switch: $500–$2,000
Installation labor: $3,000–$5,000 depending on complexity
Concrete pad, fuel line, permits: $500–$2,000
Total installed: $7,000–$18,000 for most residential jobs. Smaller essentials-only setups come in at the low end. Whole-house setups (22kW+) with panel upgrades and long fuel runs come in higher.
Get a specific quote based on your property. Published ranges can only get you in the ballpark.
How Long Does It Take?
From signed quote to running generator, typical timeline is 8-14 weeks. That includes equipment ordering, permit processing, and scheduling the install. The physical installation usually takes 1-2 days, and inspection follows within a few days after. Equipment lead times vary — during peak demand (storm season, post-storm spikes), generators can be back-ordered for months. Plan ahead.
Storm Season Timing
If you're in Grays Harbor or on the coast, don't wait until November to start this process. Generator demand spikes before storm season, equipment lead times increase, and electricians get booked out. Late summer and early fall is the time to get this scheduled.
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Triple Tree Electric installs complete standby generator packages across Grays Harbor, Thurston, and Mason Counties. One call, whole project — equipment, installation, permits, and inspection.