Generac Generator Cost (2026): Every Model, Installed Price
A Generac generator costs $2,500–$15,000 installed in 2026. See Guardian and PWRcell prices by size, what installation adds, and how to compare a quote.
Typical cost ranges
| Item | Low | High | Notes |
|---|---|---|---|
| Generac 7.5–10 kW air-cooled (installed) | $2,500 | $4,500 | Essentials only: fridge, furnace, lights, sump pump. |
| Generac 14–16 kW air-cooled (installed) | $4,500 | $8,000 | Most common size for an average home. |
| Generac 18–22 kW air-cooled (installed) | $6,000 | $11,000 | Handles central AC plus most of the house. |
| Generac 24–26 kW air-cooled (installed) | $9,000 | $15,000 | Full whole-home coverage, larger properties. |
| Generac liquid-cooled 30 kW+ (installed) | $14,000 | $25,000 | Longer run times, heavier loads, commercial-grade. |
| Automatic transfer switch (ATS) | $500 | $1,500 | Required for any standby setup; sometimes bundled. |
| Natural gas or propane hookup | $400 | $3,000 | Low if a stub exists nearby; high if a line must be run. |
| Concrete pad, permit and inspection | $400 | $1,500 | Permit fees vary a lot by city and county. |
| Annual maintenance plan | $150 | $400 | Oil, filter, plugs, battery check, load test. |
Ranges are typical U.S. market estimates for 2026 and vary by region, home, and contractor. Always confirm a written quote before work begins.
A Generac home standby generator costs $2,500 to $15,000 installed, and the most common size people actually buy lands between $6,000 and $11,000. The generator itself is only about 40–55% of that number. The rest is the automatic transfer switch, the gas connection, the concrete pad, permits, and the electrician’s labor.
That split is the single most useful thing to understand, because it explains why two neighbours with the same Generac model can be quoted $3,000 apart. The hardware has one price. The installation does not.
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Generac model prices, installed
Prices below cover the unit plus a standard installation: automatic transfer switch, gas hookup, pad, permit and labor. They are 2026 U.S. ranges.
| Size | Installed cost | What it realistically powers |
|---|---|---|
| 7.5–10 kW air-cooled | $2,500–$4,500 | Fridge, furnace, lights, sump pump, well pump |
| 14–16 kW air-cooled | $4,500–$8,000 | The above plus a few circuits, minus central AC |
| 18–22 kW air-cooled | $6,000–$11,000 | Most of the house, including one central AC |
| 24–26 kW air-cooled | $9,000–$15,000 | Whole home, larger properties |
| 30 kW+ liquid-cooled | $14,000–$25,000 | Everything, with long continuous run times |
If you are comparing a quote, check whether it includes the transfer switch. A quote that looks $1,200 cheaper often simply excludes it.
What the installation actually includes
Installing a standby generator is four separate jobs, and each has its own price.
- The generator and its pad. A level concrete or composite pad, set away from windows and doors for exhaust clearance. Usually $400–$1,500 with the permit.
- The automatic transfer switch (ATS). This is the part that detects an outage and switches your house over. It is required, not optional, and runs $500–$1,500 installed.
- The fuel connection. Natural gas if you have a stub nearby (cheap), or a propane tank and line (more). Running a new gas line can add $500–$3,000 on its own.
- Electrical work and inspection. Wiring the ATS into your panel, plus the permit and the municipal inspection. Labor here is the biggest source of quote variance.
Why two quotes for the same model differ by thousands
Three factors drive almost all of it:
- Fuel source. If a natural gas stub already exists near the pad, you save $1,000–$2,500 against a fresh propane install.
- Panel condition. An older or full electrical panel may need upgrading before the ATS can be fitted. That is a separate job and a common surprise.
- Distance and access. Running a gas line across a large lot, or getting equipment into a tight side yard, adds labor.
- Who is doing the work. A factory-authorized dealer costs more than an independent electrician, but typically keeps the warranty straightforward.
This is why the advice is always the same: collect at least three quotes for the identical model, and compare them line by line rather than on the total.
Generac vs other brands
Generac is the volume leader in U.S. home standby, which shows up in three practical ways:
- Dealer network. Easier to find an authorized installer and to get parts than for smaller brands.
- Parts availability. Filters, plugs and controllers are widely stocked, which keeps maintenance simple.
- Price. Being the best-known name means you often pay a small premium over Kohler or Cummins for comparable output.
For an average home, the difference between a Generac and a comparable Kohler or Cummins unit is usually a few hundred dollars on the hardware. The deciding factor is almost always which installer is competent and available locally.
Portable vs standby: the honest comparison
If your outages are short and rare, a standby generator is hard to justify.
| Portable | Standby (Generac) | |
|---|---|---|
| Installed cost | $700–$3,500 | $2,500–$15,000 |
| Starts automatically | No | Yes |
| Runs your AC | Rarely | Yes, at 18 kW+ |
| Fuel | Petrol, or propane | Natural gas or propane |
| Needs an electrician | For a transfer switch | Yes, always |
| Best for | Occasional short outages | Frequent or long outages |
The honest test: how many hours a year do you actually lose power? Under about ten, a portable unit plus an interlock kit is the rational buy. Over a few days a year, or if you have a well pump, sump pump or medical equipment, the standby unit earns its cost.
Ongoing cost after installation
Budget beyond the install price:
- Annual service: $150–$400, covering oil, filter, plugs, battery and a load test.
- Exercise cycles: the unit runs itself weekly on a small amount of fuel. Usually negligible, but not zero.
- Fuel during an outage: a 22 kW unit under load burns noticeably more than its idle rating. A multi-day outage on propane can mean a refill.
- Battery replacement: every three to five years, roughly $80–$200.
How to get an accurate quote
- Decide what must stay powered. List your essential circuits before you talk to anyone. This determines the size, and it is the only variable you fully control.
- Confirm your fuel. Natural gas is cheaper and simpler if you already have it. Propane needs a tank and a delivery plan.
- Check the panel. Ask the installer to assess whether your existing panel can take an ATS.
- Get three itemised quotes for the same model. Ask each to break out the unit, the ATS, the gas work, the pad, permits and labor.
- Ask about the warranty in writing. Who performs the install can affect what is covered.
- Plan the permit timeline. The inspection is often the longest wait in the whole project.
Common mistakes
- Sizing to the whole panel. You rarely need to run everything. Sizing to essentials can drop you two size tiers and thousands of dollars.
- Forgetting the transfer switch in comparisons. It is required, so a quote without it is not comparable.
- Assuming the permit is included. Some quotes exclude it, and fees vary by city.
- Buying the unit yourself to save money. It can void or complicate the warranty, and you take on the coordination risk.
- Ignoring the panel age. An old panel can turn a $7,000 job into a $9,500 one.
- Skipping maintenance. A generator that has not been serviced is the one that fails on the night you need it.
Bottom line
A Generac installed costs $2,500–$4,500 for a small 7.5–10 kW unit, $6,000–$11,000 for the common 16–22 kW size, and $9,000–$15,000 for 24 kW and up. The unit is under half the total, so the installer matters more than the model number.
Size to what you cannot afford to lose rather than to your whole panel, confirm whether you already have natural gas, and get three itemised quotes for the identical unit. For the wider picture across brands, see our whole-home generator installation cost guide and generator maintenance cost.
Frequently asked questions
How much does a Generac generator cost installed?
Installed Generac home standby generators run about $2,500–$4,500 for a 7.5–10 kW unit, $6,000–$11,000 for the common 16–22 kW size, and $9,000–$15,000 for 24 kW and up. Liquid-cooled 30 kW+ systems start around $14,000. The generator is roughly 40–55% of the total; the transfer switch, gas hookup, pad and labor make up the rest.
Is it cheaper to buy a Generac and hire my own installer?
Sometimes, but check the warranty first. Generac's home standby warranty is generally conditioned on installation by a licensed contractor, and an authorized dealer install keeps the paperwork clean. Buying the unit yourself and hiring an electrician can save money on paper, but you carry the risk if the installation is rejected or the warranty is questioned.
How much does a Generac 22 kW generator cost?
A Generac 22 kW standby generator typically runs $6,000–$11,000 installed. The unit alone is often $5,000–$6,500, with the balance covering the automatic transfer switch, gas connection, concrete pad, permits and labor. Quotes for the identical model vary by several thousand dollars between installers, so collect at least three.
Does a Generac generator add value to a house?
It can help in markets where outages are common, and buyers in storm-prone or rural areas often pay attention to it. It is not a reliable value-adding renovation the way a kitchen or roof is. Treat it as a comfort and safety purchase that may help at resale, not as an investment.
Which Generac size do I need?
Size to what you cannot afford to lose, not to your whole panel. A 10–14 kW unit covers a fridge, furnace, well pump, sump pump and lights. Add central air conditioning and you generally need 18–22 kW. For a large home running everything, including electric heat or an EV charger, look at 24 kW and up, or liquid-cooled.
How much does Generac generator maintenance cost?
A professional annual service runs $150–$400 and usually covers oil and filter, spark plugs, battery check, air filter and a load test. Air-cooled units commonly need service once a year; liquid-cooled units used for long runs may need it more often.
Air-cooled or liquid-cooled Generac?
Air-cooled units (7.5–26 kW) are cheaper, quieter to install in a residential setting and fine for occasional outages. Liquid-cooled units (30 kW+) cost significantly more but tolerate long continuous runs and heavier loads, which matters in areas with multi-day outages or for small commercial use.
How long does a Generac installation take?
The mechanical install is usually one to two days. The common delay is the gas connection and the permit inspection, which can add one to three weeks depending on your utility and local building department. Plan for the whole process to run two to six weeks from signing.