What a standby generator costs installed
The generator itself is often only half the bill. This guide breaks a full installation into its parts — equipment, pad, transfer switch, gas and electrical work, permits — so you can read a quote line by line and spot the padding.
The quick answer
For a professionally installed home standby system in 2026, budget in these bands. Unit prices are the street prices we compiled in our model database; installed totals blend the published ranges listed under Sources & notes.
| Size class | Generator alone (our database) | Typical total installed | Usually covers |
|---|---|---|---|
| ~10 kW | $3,579 (Generac Guardian 10 kW) | $6,500–$11,000 | Essential circuits — fridge, furnace fan, well or sump pump, some lights and outlets |
| ~14 kW | $3,498–$5,429 across 5 models (median $4,286) | $8,500–$14,500 | Most of a small home, or a mid-size home with managed loads |
| 18–22 kW | $5,167–$6,119 across 5 models (median $5,699) | $9,500–$15,000 | Whole home, roughly 1,500–3,000 sq ft including central air |
| 24–26 kW | $6,429–$7,749 across 3 models (median $7,399) | $11,000–$18,000 | Whole home, 3,000–5,000 sq ft, all-electric houses, multiple AC units |
The bands are wide because the sources genuinely disagree, and because labor markets do. HomeGuide's national average for a whole-house install is $6,000–$11,000 all-in, while Generac's own published average runs $8,000–$16,000 including equipment, and a New Jersey installer quotes $8,500–$18,000 depending on size. If you live in a high-cost metro or your site needs trenching or a panel upgrade, plan from the upper half of the range; complex jobs past 20 kW can reach $24,000.
Not sure which class you land in? Run the sizing calculator before anyone visits your home — the size decision is worth thousands, and it should be yours, not the sales rep's.
What an installed price is made of
A standby generator is a permanent addition to both your electrical service and your gas system, so most of the quote is licensed trade work. Here is how a typical itemized quote decomposes:
| Component | Typical range | Notes |
|---|---|---|
| Generator unit (10–26 kW standby) | $3,498–$7,749 | Street price for the generator alone, from our 24-model database. Several models are also sold bundled with a transfer switch under a sibling SKU — confirm what is in the box before comparing quotes. |
| Automatic transfer switch, installed | $600–$2,500 | Whole-home service-rated switches ($700–$1,800 for the switch itself) sit at the top of the range; load-center switches cost less. |
| Concrete or composite pad | $150–$900 | Pre-cast pads are $150–$400; poured concrete, grading, or flood elevation pushes higher. |
| Gas line and connection | $800–$2,500 | Typical tie-in to an existing gas service. New line runs $12–$25 per foot, up to $50+ per foot; upsizing an undersized line or meter adds $800–$3,000. |
| Propane tank (propane installs only) | $400–$1,800 | Typical tank installation; buying a 250–500 gallon tank installed runs $1,000–$3,500. Leasing cuts the upfront cost but usually locks you to one propane supplier. |
| Electrical work | $1,800–$3,500 | Conduit, conductors, grounding, and panel connection; wiring alone runs about $6–$8 per foot. A main panel or service upgrade, when needed, adds $1,500–$4,000. |
| Permits and inspections | $80–$800 | Electrical plus gas/mechanical permits. Wildly jurisdiction-dependent; some towns add zoning or setback review on top. |
| Battery and cold-weather kit | $200–$800 | The starting battery ($70–$300) is frequently a separate line, and a cold-weather kit (battery warmer, oil heater) adds $130–$500 where winters bite. |
| Installation subtotal (all trades) | $3,000–$5,000 | What installers collectively charge beyond the equipment on a standard job; long distances or systems over 20 kW run $5,000–$12,000. |
Add the rows up and the pattern the quote in your hand follows gets obvious: on a typical $9,500–$15,000 project the generator is only about a third of the money. That is why two quotes with identical generators can still be $4,000 apart — and why comparing equipment prices between quotes tells you very little.
What moves your quote up or down
Transfer switch strategy
A whole-home, service-rated switch transfers your entire 200-amp service and costs the most. The alternative — a load-center switch or automatic load management — sheds big loads (dryer, range, second AC) for the seconds they would overload the generator. Load-management modules run $300–$800 installed and can let a 14 kW unit serve a house that would otherwise need 22 kW; that trade is usually worth several thousand dollars. The sizing calculator shows the load you actually need to cover.
Distance from the meter and the panel
Every foot between the generator pad and your electrical panel is conduit and conductor at roughly $6–$8 per foot; every foot to the gas meter is pipe at $12–$25 per foot or more. Cross a driveway or patio and trenching alone can add $500–$3,000. Placing the unit as close to both utilities as code clearances allow is the cheapest decision you will make.
Fuel: natural gas vs propane
Natural gas needs no tank and never runs out, but standby units make less power on it — commonly around a tenth less than their propane rating. In our database the Generac Guardian 22 kW delivers 19.5 kW on natural gas; the Kohler 14RCA drops from 14 to 12 kW. Propane avoids the derate question but adds the tank ($400–$1,800 typical, more to buy outright) and costs far more per day to run — the fuel & runtime guide does that math. If your existing gas line cannot feed a generator alongside your furnace and water heater, add $800–$3,000 for upsizing.
Cold-climate equipment
Where temperatures drop below freezing, budget the cold-weather kit ($130–$500) and expect the starting battery ($70–$300) to be a recurring replacement every few years. None of this is optional padding — a standby unit that cannot start at −10°F is lawn art.
Brand tier
Equipment spreads are real but modest next to labor. In the 14 kW class our database runs from $3,498 (Champion) to $5,429 (Generac), and at 24–26 kW the Generac and Kohler flagships reach $7,399–$7,749. Installation labor barely changes with the badge; what the premium buys is dealer network, warranty handling, and sometimes quiet — the Champion 14 kW is rated 62 dB against 65 dB for the comparable Generac. Compare models side by side in the model database.
The portable shortcut: a fifth of the money, none of the automation
If the standby numbers sting, a large portable or inverter generator on a manual hookup covers the essentials for a fraction of the price. Every unit below is from our model database:
| Piece | Typical range | Notes |
|---|---|---|
| Large portable or inverter generator | $949–$2,699 | Westinghouse iGen4500DFc ($949) up to the DuroMax XP15000EH ($2,699) in our database; big dual-fuel portables cluster at $1,099–$1,499. |
| Interlock kit + power inlet box, installed | $400–$850 | Parts are cheap (inlet box ~$85, interlock kits ~$90); you are paying an electrician for an hour or two. One installer lists $580 (30-amp) to $779 (50-amp) including breaker and interlock. Your panel needs two spare breaker spaces, and the generator needs a 240V outlet. |
| GenerLink meter-mounted transfer device | $774–$1,120 | Installed through participating utilities (two North Carolina cooperatives list $774–$906.50 for 30/40-amp models including tax and installation; another charges $1,120 plus tax). Availability depends entirely on your utility; the 40-amp version caps continuous output at 9,600 W. |
All-in, the portable route lands around $1,400–$3,500 against a $6,500 floor for the smallest standby install. The trade-offs are equally concrete: you wheel the unit out and start it by hand (nothing is automatic), you store and rotate gasoline or swap propane tanks, you manage loads manually so the AC and dryer do not gang up on it, and a big open-frame portable at 72–74 dB is far louder than a 61–69 dB standby unit. Inverter models (52–68 dB in our database) close the noise and power-quality gap at a higher price per watt. For lights, fridge, furnace fan, and a well pump through a weekend outage, it is a rational place to land.
After the install
Two recurring costs belong in the budget from day one. Annual professional maintenance runs $200–$650 a year (oil, filters, plugs, battery test, load check), and the starting battery is a wear item. Fuel during an outage is the wildcard: at a 20 kW size, HomeGuide puts a day of runtime at roughly $30–$40 on natural gas against $150–$170 on propane. Our fuel & runtime guide works through cost per day and tank sizing from the consumption figures in the model database.
Where quotes pad
Three patterns account for most inflated quotes. Oversizing: selling a 26 kW unit for a 14 kW load — run the sizing calculator before any home visit so the size conversation starts from your numbers. Bundled maintenance contracts signed at install, priced well above the $200–$650 a yearly service visit actually runs. The "free" transfer switch that quietly reappears inside the equipment line — which is why the bundle question matters, since several models in our database are sold with and without a switch under different SKUs. The defense against all three is the same: an itemized quote, in writing, compared against at least two competitors.
Sources & notes
Installed-cost ranges and component prices were compiled from the following published guides and price lists, checked October 2026. All figures are US dollars.
- HomeGuide, “How Much Does a Whole House Generator Cost (2026)” — homeguide.com/costs/generator-cost — installed totals, installation labor, per-foot wiring and gas-line costs, pad, permits, transfer switch and interlock ranges, accessories, and daily running costs.
- GenDealers, “The Real Cost of a Whole-House Generator in 2026” — gendealers.com/blog/hidden-costs-of-owning-a-standby-generator — component table for a 14–22 kW natural-gas install ($9,500–$15,000 typical total), gas upsizing, trenching, panel upgrade, propane tank, and load-management costs.
- Malfettone Electric, “Whole-House Generator Cost in NJ 2026” — malfettoneelectric.com — installed bands by size ($8,500–$11,000 at 10 kW up to $14,000–$18,000 at 24–26 kW) from a high-cost metro installer; treat as the upper-bound reference.
- Generac's stated average installed cost ($8,000–$16,000 including the generator), as reported in “Generac Generator Cost in 2026” — udpwr.com.
- Central Electric Cooperative, “GenerLink Transfer Switch” — central.coop/generlink-transfer-switch, and Central Electric Membership Corporation — cemcpower.com — GenerLink pricing including installation.
- On Time Electric, “Portable Generator Power Inlet Installation” — on-time-electric.myshopify.com — installed pricing for 30-amp and 50-amp inlet/interlock packages.
- Generator, portable, and inverter street prices: TallyGauge model database, compiled from manufacturer documentation and retailer listings, October 2026.
Installed quotes vary sharply by region, installer, and site conditions — gas-line distance, panel condition, and local permit practice move the total more than the choice of generator does. Use the ranges here to interrogate a quote, not to replace one: get at least two or three itemized, in-person estimates for your specific house.