Standby Generator Costs in 2026 (and Where the Wait Really Comes From)

As of October 2026, a home standby generator professionally installed costs about $7,000 to $20,000. Most families who buy the common 22 kW size pay roughly $10,000 to $14,000 all-in. The generator itself is only about half of that bill. The rest is the transfer switch, labor, the pad, the gas line, permits and inspections.

As for the wait: for most houses it isn't the generator that's backordered. The holdups are the installer's schedule, the permit office and sometimes the gas utility. In the fall, after a stormy summer, a 4–8 week job can easily run longer.

01What the money buys, by size

Cost guides published in 2026 mostly agree on these installed ranges (as of October 2026):

• Small units, 10–14 kW: about $7,000–$10,000. Covers essential circuits: furnace blower, fridge, sump pump, some lights and outlets.
• Mid-size, 18–24 kW: about $10,000–$16,000. This is the whole-house range for a lot of ordinary 2,000–2,500 sq ft homes with gas heat.
• Large, 26 kW and up: $15,000–$20,000 and higher. Big houses, all-electric homes, or multiple central air units.

If you haven't figured out what size you need, do that before you call anyone. Our guide on how to size a backup generator walks through it, and starting watts vs. running watts explains why a well pump or AC compressor bumps you up a size.

02Why some websites say $5,000 and others say $15,000

You'll see wildly different "average" numbers online. Angi lists a national average near $5,157 for whole-house generator installation, and its 20–24 kW range is about $5,000–$6,500. Other 2026 guides put the same size at $10,000 or more installed.

The difference is mostly what's counted. Angi's figures include smaller and portable setups, and the 20–24 kW range lines up with what the unit alone costs. The higher guides count the whole job. When you budget, assume the box is about half and the install is the other half.

Here's roughly how a mid-size job breaks down, per 2026 cost guides (as of October 2026):

• Generator, 20–24 kW: about $5,000–$6,500
• Automatic transfer switch: about $2,700–$3,700 installed, more if you need a panel upgrade
• Labor, permits, pad, gas line, inspections: about $4,000–$7,000

Things that push you toward the high end:

• A long run from the gas meter to the generator spot
• A gas meter too small for the generator (more on that below)
• No natural gas, so you need a propane tank set
• An old or full electrical panel that needs replacing
• Local rules on how far the unit must sit from windows, doors and property lines

If the price makes you wince, compare it with a portable generator and a manual setup. Our transfer switch vs. interlock kit post covers the cheaper way to feed the panel. Portable power station vs. generator covers the battery route.

03Where the wait actually comes from

There's real news behind the headlines about generator shortages, but it's mostly about the big machines.

AI data centers need backup power for nearly every megawatt they draw, and they're buying large generators years in advance. Generac said on its second-quarter 2026 earnings call that its data center backlog had reached about $1.6 billion, including a hyperscale deal of roughly $700 million for delivery in 2027. Industry dealers report lead times of a year or more for the multi-megawatt units those sites use.

That's a different product line from the air-cooled unit beside your house. On the same call, Generac said home standby sales had returned to growth even though outages ran more than 30% below normal, and it didn't describe home units as short. It also said in-home consultations were up, driven by the Midwest after multiple storms. So more people are getting quotes, and they're all calling the same local installers.

For a typical house, the wait looks like this:

1. Site visit and quote: a few days to a couple of weeks, longer right after a big outage.
2. Permits: one New Jersey installer puts electrical and gas permits at 3–10 business days each. Zoning can take anywhere from 3 days to 4 weeks. Small towns are often faster than big cities.
3. Equipment delivery: usually 1–2 weeks, stretching to 4–8 weeks in high-demand periods.
4. Gas meter upgrade, if needed: a 22 kW unit can draw more gas than your current meter supplies. The utility has to swap the meter or service line, and that same installer says it can add 4–8 weeks.
5. Install day: the physical work is usually done in a day. Your power is off for a few hours while the transfer switch goes in.
6. Final inspection: another 1–2 weeks in many towns.

Guides from installers put the whole process at about 3–8 weeks from permit application to final inspection. Add a utility meter upgrade or a fall rush and you're past two months.

04Fall is the busiest season

Installers consistently say demand peaks in the fall, before winter storms, and right after any major outage. Spring through early summer is the quiet stretch, when contractors, permit offices and suppliers are least backed up.

So if you sign a contract in October, don't count on it running for Thanksgiving. Plan as if your first ice storm will hit before the generator is in. That means:

• A working portable generator or power station as a stopgap. Start the generator in October, not during the storm.
• A plan for the sump pump. See keeping the sump pump running in an outage.
• A heat plan for the gap. See heating your home without power, safely.

If you can wait until spring, you'll likely get a shorter queue and more installers willing to compete for the job.

05How to keep your own job moving

These steps cut weeks off the wait:

• Call your gas utility first. Ask what size meter you have and whether a 22 kW (or whatever size you're considering) generator on top of your furnace, water heater and range will need an upgrade. If the answer is yes, ask the installer to file that request the day you sign.
• Get two or three quotes in writing. Make sure each one includes the transfer switch, pad, gas run, permits and inspection. If a quote is far below the others, check what's missing.
• Ask who pulls the permits and how long your town usually takes. Local installers know which offices are slow.
• Pick the spot before the site visit. Check your local clearance rules from windows, doors and lot lines, and keep it well away from bedroom windows. Our generator safety post covers carbon monoxide.
• Ask about the maintenance plan. A standby unit needs oil changes and a yearly service. Get that price up front so it's not a surprise in year two.
• Check your state's rules on generator permits, noise limits and setbacks. They vary by state and by town, and your installer should know the local version.

06The one thing to remember

Budget roughly double the generator's sticker price for the finished job, and assume a fall install takes 2 months, not 2 weeks. If you need power this winter, get your backup plan ready now, and let the standby generator be what you have for the storms after that.

To see how long outages actually run around here, read Midwest power outages: how long they really last.

Related: The CO Alarm Went Off. Leave First, Then Call

Sources (6)

• Generac Q2 2026 earnings call transcript (The Motley Fool)
• Generac Q2 2026 earnings call summary (Investing.com)
• Angi: Whole House Generator Cost, 2026 data
• Standby Generator Cost: The Machine Is Half, 2026 (RealCostIQ)
• How Much Does a Standby Generator Cost Installed in 2026 (Generator Advice)
• Generator installation timeline (Malfettone Electric)

Photo: Generac standby generator gas line hookup by Generac Power Systems, used with credit.