2026 installed-cost research + planning tool
Whole house generator cost in 2026: start with the installed price, not the box price.
For a professionally installed home standby system, a practical national planning range is roughly $8,000–$16,000 installed for many projects. Generac currently publishes that same installed range as an average guideline, while KOHLER notes that larger or more complex installations can run well over $20,000. The generator itself is only one part of the total.
Direct answer
How much does a whole-house generator cost in 2026?
Plan on about $8,000–$16,000 installed for many home standby generator projects. Generac currently publishes that range including the generator itself. KOHLER says total home-generator costs can range from several thousand dollars to well over $20,000 depending on system size, transfer equipment, fuel work, panel upgrades, permits, site work and regional labor. Consumer cost databases sometimes show lower averages because their project pools mix smaller systems and different scopes. For a useful comparison, separate the generator MSRP from the transfer switch, electrical work, fuel connection, pad/site work and permits.
Interactive planning estimator
Build a transparent cost range instead of accepting a mystery average.
Start with an exact equipment price or one of the current manufacturer MSRP presets. Then turn on only the installation items that are not already included in your contractor or equipment package. The calculator exposes its assumptions so you can see why the range moves.
Planning inputs
Build the scope you are actually pricing.
Use this for trenching, landscaping, meter/regulator work, cold-weather accessories or other scope already identified by a contractor.
Current manufacturer equipment benchmarks
The same kW class can have a different package price.
These are manufacturer-published starting MSRPs—not retailer listings. They show why the ATS/package column matters. A generator-only model and a generator bundled with a whole-house switch should not be compared as if the prices cover the same equipment.
| Brand | Model | Published output | Starting MSRP* | Package note |
|---|---|---|---|---|
| KOHLER / Rehlko | 10RESV | 10 kW | $3,946 | Generator only |
| KOHLER / Rehlko | 14RCA | 14 kW LP / 12 kW NG | $5,098 | ATS sold separately |
| Briggs & Stratton | PowerProtect 22 kW · 040786 | 22 kW LP / NG | $6,037 | Generator only |
| KOHLER / Rehlko | 20RCA | 20 kW LP / 18 kW NG | $6,016 | ATS sold separately |
| Generac | Guardian 22 kW · 7043 | 22 kW LP / 19.5 kW NG | $6,979 | 200A whole-house switch bundle |
| Briggs & Stratton | PowerProtect 26 kW | 26 kW LP / 24 kW NG | $6,970 | Generator only |
| Generac | 22 kW · 7325 | 22 kW LP / 19.5 kW NG | $7,369 | Transfer-switch bundle |
| KOHLER / Rehlko | 26RCA | 26 kW LP / 24 kW NG | $7,546 | RCA package scope: verify dealer quote |
*Starting MSRP shown on current manufacturer pages. Dealer pricing, tax, freight, accessories, configuration and installation can differ. For RCA/RCAL KOHLER models, verify the exact suffix: current KOHLER guidance says RCAL includes a transfer switch while RCA normally sells the switch separately.
Where the rest of the money goes
Six cost buckets explain why two “same generator” quotes can be thousands apart.
Generator + ATS
The advertised generator price may or may not include an automatic transfer switch. Compare the exact model/package and service rating—not just the kW number.
Electrical scope
Service size, panel condition, ATS configuration, conduit distance, load management and panel/subpanel upgrades can move the electrical cost substantially.
Natural gas or propane
Pipe length, gas-meter/regulator capacity, propane storage and full-load fuel demand can turn a simple hookup into a larger project.
Site work
Pad type, trenching, grading, landscaping, delivery access and distance from the fuel/electrical connection points all affect labor and material.
Permits + inspections
Electrical, fuel-gas, building, zoning and utility requirements vary by jurisdiction. A national calculator cannot know your local permit path.
Climate + accessories
Cold-weather kits, battery heaters and other model-specific accessories can matter in northern climates and belong in the quote when required.
2026 published component ranges
The estimator uses visible assumptions—not hidden math.
| Scope item | Published planning range used | Important limitation |
|---|---|---|
| Licensed generator installation labor | $1,500–$5,000 | Contractors often bundle portions of ATS, wiring, placement or site work into labor. |
| Transfer-switch installation | $1,200–$1,600 | Do not add if your generator package/quote already includes the switch and its installation. |
| New/extended natural-gas line | $260–$820 typical | Generator BTU demand may also require meter/regulator or larger-pipe work outside the typical range. |
| Propane tank + installation | $600–$2,500 typical | Large or underground storage can cost substantially more; tank sizing must match actual generator use. |
| Standard 3×6 concrete pad | $900–$1,350 derived from $50–$75/sq. ft. | Composite pads, grading, difficult access and restoration change this. |
| Electrical subpanel | $500–$2,000 | A full service-panel replacement is a different scope. |
| Permits | $50–$200 each | Many projects need more than one permit; local fees control. |
| Smart load manager | $150–$300 hardware | Labor, quantity and brand-specific modules may be extra. |
Why online averages disagree
The dataset may be pricing a different job than yours.
A national average can include smaller backup systems, generator-only purchases, easy utility connections and simple electrical work. A larger whole-home standby project can include a 200A service-rated ATS, gas-meter or propane work, trenching, pad/site preparation, permits, load management and commissioning. That is why a manufacturer MSRP around $6,000–$8,000 and a complete installed quote above $10,000 can both be reasonable numbers for different scopes.
Quote comparison checklist
Make every contractor price the same project.
A low total can simply exclude work. Normalize the scope before comparing price.
Natural gas vs propane
Fuel choice changes installation assumptions.
Natural gas avoids an on-site storage tank, but the existing meter, regulator and piping still have to support generator demand plus the home's other gas loads. Propane adds storage and cold-weather vaporization considerations. Neither fuel should be chosen from a single national cost-per-day table.
Compare propane vs natural gasGenerator size
Square footage alone does not size the generator.
Air conditioners, heat pumps, wells and other motor loads can dominate starting demand. Load management can sometimes reduce the generator size required for a given comfort target. Complete a load-based sizing exercise before letting a price table decide the kW.
Use the sizing toolCost questions homeowners actually need answered
Is a transfer switch included in the generator price?
Sometimes. Package and model suffix matter. Current KOHLER guidance distinguishes RCA (switch normally sold separately) from RCAL (switch included), while Generac sells both generator-only and bundled models.
Why can two quotes for the same generator differ by thousands?
Fuel-line distance, meter/regulator work, panel/service work, ATS configuration, trenching, site access, permits, accessories and excluded work can differ even when the generator model is identical.
Is a 22–26 kW generator automatically a whole-house generator?
No. Whole-house capability depends on actual connected loads, natural-gas versus propane output, starting loads and load-management strategy—not the marketing label alone.
Can I buy the generator online and hire someone to install it?
Possibly, but compare freight/damage responsibility, installer willingness, ATS compatibility, startup/commissioning, warranty registration and who owns an equipment problem before assuming the separate purchase is cheaper.
What ongoing cost should I budget?
Maintenance, battery replacement, fuel during outages and optional monitoring are recurring ownership costs. The exact maintenance schedule belongs to the specific model family.
What is the safest way to lower the project cost?
Reduce avoidable complexity—not required safety work. Size from actual loads, evaluate load management, choose a viable code-compliant placement, and compare itemized scopes from qualified installers.
Installation guide
Placement, ATS, fuel, permits and commissioning behind the price.
Find an installer
Use official manufacturer networks and compare complete project scope.
Maintenance after installation
Compare current maintenance guidance across five major standby brands.
Plan generator size
Build a load worksheet before comparing equipment and installation quotes.
Next step
Take the planning range into an itemized installer quote.
The estimator is most useful as a checklist: ask the installer which line items are included, which are allowances and which are excluded.
Optional paid referral
Need another local electrical quote?
Angi offers an electrical service request option. Generator installation and standby-generator experience are not guaranteed, so confirm the provider can handle your exact project, licensing and local requirements before booking.
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