If you're shopping for a whole-house generator in California, you've probably seen pricing that ranges from $6,000 to $40,000 — sometimes for what looks like the same machine. As an authorized Cummins dealer and a full-service Generac dealer, we install both lines and have no incentive to push you toward one or the other. The price is what it is, and most of the spread comes from the work around the generator, not the generator itself.

This guide breaks down whole-house generator pricing by kilowatt size, by brand (Cummins QuietConnect and Generac Guardian), and by the parts of the job that most quotes leave invisible — the gas line, the transfer switch, the concrete pad, the panel work, and the permits.

The 30-Second Answer

For a typical 3,000–5,000 sq ft home in the Los Angeles or Ventura market, the all-in installed cost of a Cummins or Generac whole-house standby generator in 2026 ranges from $14,000 to $28,000. Smaller systems (under 14kW, partial-home coverage) start around $9,500. Estate-scale installs (24–48kW, 400A service, large fuel reserve) can run $35,000 to $60,000.

That range is wide because the generator itself is only about 40% of the total project cost. The other 60% is the labor, materials, and code work required to make the system actually run safely when the grid drops.

What's Actually in the Quote

A real, permit-pulled, code-compliant whole-house generator installation in California includes the following line items. If a quote doesn't enumerate these, ask for a breakdown.

The generator itself

The headline number you see in advertising. A Cummins QuietConnect 20kW retails around $7,400; a Generac 22kW Guardian around $5,800; a Kohler 26RESCAL around $8,400. These are equipment-only prices.

The automatic transfer switch (ATS)

A code-required switch that disconnects your home from the grid and connects it to the generator the instant the utility power drops — and switches back when it comes home. A 200A service entrance-rated ATS runs $900–$1,800 in parts. For larger homes with 400A service, the ATS jumps to $2,400–$3,800.

The concrete pad

The generator sits on a leveled, code-rated pad. Composite pads run $300–$600; poured concrete runs $800–$1,500 depending on access and grading. In LA hillside neighborhoods, pad work alone can exceed $2,500 because of soil and slope.

The gas line

This is the single most variable cost in a California generator install. The gas company sets the meter capacity; if your existing meter can't supply the generator's BTU demand on top of your existing appliances, the meter has to be upsized. Add to that the run from the meter to the pad — every 10 feet of new gas pipe adds $300–$500. A simple straight run might be $1,200; a complex run across a property with trenching can hit $6,000.

The electrical panel

A 22kW generator integrated with a 200A panel is straightforward. A 12kW generator powering a sub-panel for essential circuits is also straightforward. But many older Los Angeles homes still run 100A or 125A service, which has to be upgraded to 200A (or 400A) before any whole-house generator can be installed. Panel upgrades typically run $3,500–$6,500 in our market.

The permits and inspections

Los Angeles County, Ventura County, and the City of Malibu all require permits for generator installations. Permit fees range from $300 to $1,200 depending on jurisdiction. Most quotes bundle this in; some don't.

The labor

A two-person crew, one full day for a clean install, two days if panel or gas work is involved. Labor in this market runs $1,800–$4,500.

Pricing by Generator Size

The most useful question isn't "what does a generator cost" — it's "what size do I need, and what does that cost." Here's the actual installed pricing we see across the LA and Ventura markets in 2026:

11–14kW — Partial home coverage (essentials only). All-in installed: $9,500–$13,500. Best for: small homes under 2,500 sq ft, or homeowners who only want fridge, lights, and heating during outages.

18–22kW — Whole home for most California homes. All-in installed: $14,500–$22,000. Best for: typical 3,000–5,000 sq ft home with central AC and modern appliances. This is the most common size we install.

24–32kW — Whole home with high AC demand. All-in installed: $22,000–$32,000. Best for: larger homes, multiple HVAC units, pool equipment, large kitchens with double ovens and induction.

36–48kW — Estate-scale. All-in installed: $35,000–$60,000. Best for: 8,000+ sq ft homes, multi-building properties, well pumps, and irrigation systems.

Cummins vs. Generac: What You Pay For

We're authorized for both, so we'll tell you the truth. Where the cost diverges is warranty, sound level, build quality, and how the system feels to live with.

Cummins QuietConnect sits at the top of the residential standby market. The engines are commercial-grade and tend to outlast competitors in heavy-cycle use. The QuietConnect line lives up to the name — at idle and under light load, they run noticeably quieter than equivalent Generac units, which matters a lot in dense neighborhoods and HOA-restricted properties. Pricing runs roughly 15–25% above a comparable Generac. For Malibu, Hidden Hills, and the high end of the Palisades market, this is what we install most.

Generac Guardian dominates the broader California market for a reason: the dealer and parts network is enormous, pricing is competitive, and the 10-year warranty on key components is industry-leading at this price point. For value-conscious homeowners and for properties where service access matters more than premium quietness, Generac is the workhorse choice.

We install whichever fits your home. No quota, no preferred brand. We've put in dozens of each.

What Makes California Different

A few things drive California generator installs to the high end of national averages:

PSPS exposure. Pacific Gas & Electric and Southern California Edison shut off power preemptively during high wind and fire conditions. Some Calabasas, Malibu, and Hidden Hills homes lost power 8–12 times in 2024 alone. Backup generators in these neighborhoods aren't a luxury — they're insurance.

Strict permitting. California building codes are among the strictest in the country. Setback rules (how far the generator must be from windows, property lines, and combustibles) frequently force more complex pad placement.

Title 24 energy code. Generator installs often trigger Title 24 review for systems integrated with solar or battery storage.

Coastal corrosion. In Malibu and Pacific Palisades, salt air shortens generator lifespan by 20–30 percent unless the unit is properly oriented and maintained. Expect higher-grade enclosures and more frequent service.

How to Spot a Quote That's Too Low

We've reviewed competing quotes for homeowners and the cheapest one almost always has one of these problems:

• No line item for the gas line. They'll discover the meter is undersized on install day and hit you with a $3,500 change order.

• No mention of permitting. Either they're skipping it (illegal, voids your home insurance) or they'll bill it later.

• Composite pad on a hillside lot. This will void the manufacturer warranty in 18 months.

• Generic transfer switch instead of service entrance-rated. Cheaper, but doesn't meet code in most California jurisdictions.

A real quote should be three or four pages long, with every line itemized.

Adding Battery Backup to the System

If you're already pulling permits and trenching for a generator, it's often the right time to add a Franklin Home Power or Tesla Powerwall battery as a second layer of resilience. Battery handles short outages silently and runs your solar through the day; the generator handles multi-day PSPS shutoffs and powers high-demand loads like AC and EV charging. We design and install both layers as a single system. Pricing for a stacked battery + generator install typically lands $32,000–$55,000 depending on battery capacity.

The Bottom Line

For most Los Angeles, Malibu, and Ventura County homeowners shopping in 2026, a properly installed whole-house generator from Cummins or Generac will run $14,000 to $28,000 all-in. Spend less than that and something is being skipped. Spend more and you're either in an estate-scale install or you're being overcharged.

If you'd like a real itemized quote for your specific home — including a free on-site assessment within 25 miles — call (818) 606-8651 or request a quote online. We'll spec the right system, pull the permits, and stand behind every line item.

RC Generators & Electric is a CSLB-licensed (#1105336) electrical contractor based in the greater Los Angeles area. We're an authorized Cummins dealer and a full-service Generac dealer — sales, installation, and service for both lines. We're also authorized installers for Franklin Home Power and Tesla Powerwall battery backup systems. Specialists in residential and commercial standby generator installation with 80+ generator projects completed and 1,000+ electrical projects overall, across the LA, Malibu, and Ventura County markets. Free on-site assessment within 25 miles. (818) 606-8651.