A whole house generator costs $5,000 to $21,000 installed in 2026
A whole house generator costs $5,000 to $21,000 installed in 2026. HomeAdvisor lists 20 to 24 kW systems at $5,000 to $6,500 and 45 to 48 kW systems at $16,200 to $21,000. Bluetti says Generac installs average $8,000 to $16,000. ContractorPlus estimates $11,085 in Nashville. Size, gas lines, the transfer switch, and local labor move the price. Costs also differ by home and region.
What price guides say
We checked 4 price guides and read every number on their pages on October 7, 2026. They do not all measure the same thing, so read each line for what it counts.
| Source | What it found |
|---|---|
| HomeAdvisor | HomeAdvisor says installing a backup generator costs $5,157 on average and $1,512 to $8,803 for most homeowners, with sizes of 1 to 6 kW at $500 to $1,800, 7.5 to 10 kW at $2,000 to $3,500, 14 to 18 kW at $4,000 to $5,500, 20 to 24 kW at $5,000 to $6,500, 26 to 32 kW at $6,500 to $15,000, 36 to 38 kW at $14,000 to $16,000, and 45 to 48 kW at $16,200 to $21,000; labor is $1,500 to $5,000, a manual transfer switch is $500 to $2,000, an automatic transfer switch is $2,000 to $30,000, permits are $50 to $200 each, and a concrete pad is about $1,000; yearly care is $80 to $300. |
| Bluetti | Bluetti says installing a Generac generator costs $8,000 to $16,000 on average, with a 10 kW unit at $3,769 and a 24 kW unit at $6,729, and bundles with a transfer switch at $4,619 and $7,789; a sample quote lists a transfer switch at $1,200, electrical labor at $2,500, plumbing and gas at $1,500, site prep and pad at $500, and permits and testing at $400. |
| ContractorPlus | ContractorPlus estimates a whole house generator install in Nashville at $11,085 on average, with a range of $7,760 to $15,519, including a generator unit at $6,038, an automatic transfer switch at $850, a pad at $389, wiring at $600, and gas line materials at $500, with a 30 percent contractor markup. |
| AJ Long Electric | AJ Long Electric lists a portable generator hookup with an inlet and transfer switch at $900 to $2,500, a portable battery setup at $2,500 to $6,000, and whole-home battery power at $6,000 to $15,000 or more in Northern Virginia. |
Whole house generator cost by size and estimate
| Size or estimate | Installed cost | Source |
|---|---|---|
| 20 to 24 kW | $5,000 to $6,500 | HomeAdvisor |
| 26 to 32 kW | $6,500 to $15,000 | HomeAdvisor |
| 36 to 38 kW | $14,000 to $16,000 | HomeAdvisor |
| 45 to 48 kW | $16,200 to $21,000 | HomeAdvisor |
| Generac install, average | $8,000 to $16,000 | Bluetti |
| Nashville estimate, range | $7,760 to $15,519 | ContractorPlus |
| Nashville estimate, average | $11,085 | ContractorPlus |
Every number in this table was read on one of the source pages listed at the bottom of this page.
What pushes the price up
| What | Why it matters |
|---|---|
| Generator size | Bigger homes need more kilowatts. HomeAdvisor lists 20 to 24 kW at $5,000 to $6,500 and 36 to 38 kW at $14,000 to $16,000, installed. |
| Transfer switch | This switch moves your home to generator power. HomeAdvisor lists a manual switch at $500 to $2,000, and ContractorPlus lists an automatic one at $850. |
| Labor and gas work | Installers run wiring and a gas line. HomeAdvisor lists labor at $1,500 to $5,000, and Bluetti lists electrical labor at $2,500 in a sample quote. |
| Pad and permits | The unit sits on a pad, and towns want permits. HomeAdvisor lists a concrete pad at about $1,000 and permits at $50 to $200 each. |
| Brand and local rates | Name brands, crew pay, and travel change the bid. Bluetti lists a 24 kW Generac unit at $6,729, and ContractorPlus lists $7,760 to $15,519 in Nashville. |
What the price includes
A full install usually covers the generator, the transfer switch, the pad, wiring, and a gas line hookup. The installer also pulls permits and tests the system. Extras can include a longer gas line, trenching, an electrical panel upgrade, and a service plan. HomeAdvisor lists yearly care at $80 to $300. It does not include tax or extras the provider adds on the day.
Who charges this and how it is billed
Licensed electricians and generator dealers sell and install these systems. Many quotes split into equipment, labor, and permits. A deposit is common when you sign, and the rest is due when the job is done. Gas work may come from a plumber or gas fitter, so ask who pulls each permit. HomeAdvisor lists labor at $1,500 to $5,000 and permits at $50 to $200 each. Bluetti shows a sample quote with a transfer switch at $1,200 and site prep and a pad at $500. Ask for one total price in writing.
When you need this
A whole house generator makes sense if outages happen often or last long. It also helps if you run medical gear, a well pump, a sump pump, or a home office. It starts on its own when the power drops. If outages are rare, a smaller unit for key circuits may be enough and may cost less.
How to judge your quote
- Does the quote list the generator size in kW and the brand?
- Is the transfer switch included, and is it manual or automatic?
- Are the gas line, wiring, pad, and permits in the price?
- Does the quote list the warranty and who handles service calls?
- Compare the total with the range above: $5,000 to $21,000 per system for most people in 2026.
Ways to pay less
- Get three written quotes that list the brand, size, transfer switch, and permits. Compare the same items so a low bid does not hide extras.
- Size the unit with a load check. HomeAdvisor lists 20 to 24 kW at $5,000 to $6,500 and 36 to 38 kW at $14,000 to $16,000.
- Back up only key circuits if that is enough. A smaller unit with a load panel for key circuits can cost less than powering the whole house.
- Ask for a bundle with the transfer switch. Bluetti lists a 24 kW generator at $6,729 and a bundle with a switch at $7,789.
- Ask about the off season. Shops get busy after storms, so a quote in spring or summer may leave room to talk price.
How we got these numbers
The range on this page comes from HomeAdvisor, Bluetti, ContractorPlus and AJ Long Electric. We opened each source page and read every number on it on October 7, 2026. Where the sources disagree, the table above shows each one so you can see the spread. These are planning ranges, not quotes. The written price you are given is the real price.
Common questions
How much does a whole house generator cost in 2026?
Sources list $5,000 to $21,000 installed for whole house sizes. Bluetti says Generac installs average $8,000 to $16,000.
How much does a 24 kW generator cost?
Bluetti lists a 24 kW Generac unit at $6,729 and a bundle with a transfer switch at $7,789. HomeAdvisor lists 20 to 24 kW installed at $5,000 to $6,500.
How much is the labor?
HomeAdvisor lists installation labor at $1,500 to $5,000. Bluetti lists electrical labor at $2,500 in a sample quote.
Do I need a permit?
Most towns require one. HomeAdvisor lists permits at $50 to $200 each, and Bluetti lists permits and testing at $400 in a sample quote.
What does a transfer switch cost?
HomeAdvisor lists a manual switch at $500 to $2,000. ContractorPlus lists an automatic switch at $850 in its Nashville estimate.