Published October 29, 2026 · Sources checked October 29, 2026 · By the HomeProFax editorial team
Our 2026 cost guide puts a whole-house standby generator at $6,000–$25,000 installed, typically $10,000–$15,000. That is a $3,000–$6,000 unit plus $3,000–$5,000 of installation labor. Generac says its installed systems average $8,000–$16,000 including the generator (Generac, accessed Oct 29, 2026). This guide breaks that total into the line items you should see on a written quote.
Why one number is never enough
A generator quote is really several smaller jobs bundled together: equipment, electrical work, fuel work, site preparation, and paperwork. Two homes with the same generator model can get very different totals because the distances, the existing electrical service, and the local permit process differ. Generac makes the same point: pricing “can vary based on several factors, including the complexity of the installation process and your location,” and the closer the site is to the gas line and electric meter, “the more you will save on installation costs” (Generac). The quickest way to compare quotes is to ask every installer to price the same line items.
Line item 1: The generator unit
Our guide puts the unit alone at $3,000–$6,000. Installed totals by size tier, from the same guide, are:
| Generator size | Typical installed cost (2026 guide) |
|---|---|
| 10–14 kW | $6,000 – $10,000 |
| 18–26 kW | $10,000 – $15,000 |
| 26+ kW | $15,000 – $25,000 |
Things that are easy to miss: some units ship without a starting battery. Generac’s current 22–28 kW spec sheet lists “Battery requirement (not included): 12 volts, AGM Powersport Battery Group BTX30L 400CCA minimum” (Generac spec sheet, Rev. D 08/13/2026). Confirm the battery is on the quote. Choosing the kW rating is a separate decision, and the generator sizing guide covers it. This page sticks to what installation costs once the size is settled.
Line item 2: The transfer switch
The transfer switch moves your home’s circuits from utility power to the generator. Generac’s installation overview describes the installer placing it “next to your main breaker box” (Generac). Switch hardware alone varies by type. Here are list prices on Generac’s own product pages, checked October 29, 2026:
| Generac 200A automatic switch | MSRP “starting at” |
|---|---|
| Non-service-entrance rated (G0099300) | $799 |
| Service-entrance rated, integrated meter (G0099410) | $1,419 |
Labor to install the switch is part of the electrical work and is usually bundled into the installation line rather than listed separately. Our transfer switch cost guide walks through every switch type. If you want the generator to manage large loads such as central air, our calculator treats a whole-home or load-management switch as an $800–$2,000 add-on (an editorial estimate).
Line item 3: Electrical labor
Electrical work is the core of the installation labor. It covers running conductors from the generator to the transfer switch, re-landing circuits, connecting control wiring, and testing. Electricians must follow “state and local building regulations based on the National Electrical Code,” and “most states require electricians to be licensed,” according to the U.S. Bureau of Labor Statistics (BLS Occupational Outlook Handbook, accessed Oct 29, 2026). For a sense of labor rates, BLS reports a median electrician wage of $30.38 per hour ($63,190 per year) in May 2025. That is what electricians earn, not what a contractor bills. A contractor’s hourly rate also covers insurance, vehicles, permits, and overhead, so expect it to be higher.
The longer the wire run between generator and panel, the more copper and conduit the job needs. That is why Generac recommends siting the unit close to the electric meter.
Line item 4: Fuel connection
A standby generator runs on natural gas or propane, and the installer has to bring fuel to it.
- Natural gas: our calculator treats gas line work as a $0–$800 add-on (editorial estimate). The low end applies when an adequate line is already close by. The spec sheet notes that the fuel pipe “must be sized for full load,” so a long run or an undersized existing line costs more. Our hidden costs guide explains why.
- Propane: if there is no gas service, a tank and line are needed. Our calculator adds $1,500–$3,500 for propane tank and line (editorial estimate).
Choosing between fuels is its own topic. Here we only note that fuel work is a separate line on the quote and should name who does it: a licensed plumber, a gas fitter, or the fuel supplier.
Line item 5: Site preparation and pad
Generac says dealers typically prepare the site “with a concrete slab or pea gravel” (Generac). Its installation manual adds that units are typically set on “pea gravel, compacted soil, crushed stone, or a concrete pad,” and that local codes decide which is required. Our calculator prices a poured concrete pad at $300–$800 (editorial estimate). Many units ship with or are sold with a composite pad, so ask whether yours is included.
Placement rules can move the generator farther from the house, and every extra foot adds to the wire and pipe runs. Generac’s current site guide calls for at least 18 in from the rear of the unit, 3 ft at the front and ends, and 5 ft of vertical clearance above the unit. It also says installations must follow NFPA 37, NFPA 54, NFPA 58, and NFPA 70 (Generac site guide, Rev. A 01/31/2025). NFPA 37 is the fire code standard for stationary engines. It sets a 5 ft baseline from building openings and allows closer placement when testing supports it (NFPA 37).
Line item 6: Permits, inspection and startup
Permits are set locally, so there is no national price. A legitimate quote lists who pulls the electrical permit, whether a separate gas or plumbing permit is needed, and whether HOA approval applies. Generac’s overview lists “property restrictions (including HOA or community regulations)” among the topics a dealer should cover. It also notes that the job itself “usually takes hours,” but preparing for it “takes multiple weeks” because of permits, gas line preparation and dealer schedules (Generac). Before handover, the installer should simulate an outage to confirm automatic transfer.
Putting the line items together
Use this checklist to compare written quotes side by side:
| Line item | Reference figure | Source |
|---|---|---|
| Generator unit | $3,000 – $6,000 | HomeGeneratorCost 2026 guide |
| Installation labor | $3,000 – $5,000 | HomeGeneratorCost 2026 guide |
| 200A automatic transfer switch (hardware) | $549 – $1,499 list | Generac MSRP pages, Oct 29, 2026 |
| Load-management / whole-home switch | $800 – $2,000 | Editorial estimate |
| Natural gas line work | $0 – $800 | Editorial estimate |
| Propane tank and line | $1,500 – $3,500 | Editorial estimate |
| Poured concrete pad | $300 – $800 | Editorial estimate |
| Permits and inspection | Set locally | Your city or county |
| All-in average (Generac systems) | $8,000 – $16,000 | Generac, Oct 29, 2026 |
The transfer switch range covers the four Generac 200A models we checked: $549, $799, $1,419 and $1,499.
Is the spend justified?
That depends on how often you lose power. U.S. electricity customers averaged 11 hours of interruptions in 2024, nearly twice the annual average of the prior decade, and major events such as hurricanes caused 80% of those hours (EIA, Dec 1, 2025). Our guide to whether a generator is worth it covers that decision. For your own numbers, start with the cost calculator or see prices by city.
Frequently asked questions
How much does it cost to install a standby generator?
Our 2026 guide puts installation labor at $3,000–$5,000 on top of a $3,000–$6,000 unit, and a complete whole-house system at $6,000–$25,000 installed, typically $10,000–$15,000. Generac says its installed systems average $8,000–$16,000 including the generator.
What is the most expensive part of a generator installation?
Usually the generator itself. After that, the biggest swings come from the transfer switch type, the length and size of the fuel line, and any electrical service work your home needs.
Is the transfer switch included in the generator price?
Not always. Some packages bundle a switch and some do not. Generac lists 200-amp automatic transfer switches on its own, with list prices from $549 to $1,499 depending on the model, so check whether your quote names a specific switch.
Do I need a permit to install a standby generator?
In most places, yes. A standby generator is a permanent electrical and fuel-gas installation, and inspectors check it against locally adopted codes such as the National Electrical Code (NFPA 70) and the fuel gas codes. Your installer normally pulls the permit, and the fee should appear on the quote.
Sources
- Generac, “Backup Generator Installation” (accessed Oct 29, 2026)
- Generac G0099300 200A automatic transfer switch, MSRP page (accessed Oct 29, 2026)
- Generac G0099410 200A service-entrance integrated-meter transfer switch, MSRP page (accessed Oct 29, 2026)
- Generac 22–28 kW air-cooled spec sheet, Part No. A0005151077 Rev. D 08/13/2026
- Generac air-cooled home standby site guide, Part No. A0005151099 Rev. A 01/31/2025
- U.S. Bureau of Labor Statistics, Occupational Outlook Handbook: Electricians (accessed Oct 29, 2026)
- NFPA 70, National Electrical Code
- NFPA 37, Installation and Use of Stationary Combustion Engines and Gas Turbines
Not sure what size you need? Use the generator sizing calculator · Choosing a brand? Read Kohler vs. Generac.
Compare free generator installation quotes →
Generator figures marked as from the 2026 cost guide (whole-house generator $6,000–$25,000 installed, typically $10,000–$15,000; unit $3,000–$6,000; installation $3,000–$5,000; 10–14 kW $6k–$10k, 18–26 kW $10k–$15k, 26+ kW $15k–$25k) come from the HomeGeneratorCost 2026 guide. Add-on ranges, load wattages and city factors are editorial estimates. Get written quotes from licensed installers.