I've Quoted 200+ Kohler Generator Installations—Here's My 9-Step Pre-Buy Checklist

Who This Checklist Is For (and When to Use It)

I've generated and reviewed quotes for Kohler standby generator installations—residential, commercial, and light industrial—since 2019. In that time, I've personally processed over 200 orders. And I've made enough expensive mistakes to fill a small binder.

This checklist is for anyone who's received a quote for a Kohler generator—whether it's a 14kW home backup unit or a 100 kW commercial system—and needs to make sure they're not missing something. Use it before you sign the contract. Not after.

There are nine steps. Some are obvious. One of them I learned the hard way after a $3,200 mistake. I'll flag that one.

Step 1: Verify the Model Number Matches Your Load Calculation

I assumed once that a quote for a "20kW Kohler" was a specific model. Turned out it was the 20RES, which is a different footprint and transfer switch requirement than the 20RCA. Didn't verify. The installer showed up with the wrong pad size, and we lost a day.

What to do: Ask for the full model number (e.g., 20RESA or 14RCA). Cross-check it against your load calculation, not just the kW rating. The same kW rating can have different surge capacities and different connection requirements.

Checkpoint: Does the model number on the quote match what your electrician specified for your load? If you didn't get a load calculation, that's step zero—get one before you get quotes.

Step 2: Confirm the Transfer Switch Is Included (and Match It)

I once ordered a 48kW Kohler generator and assumed the transfer switch was included in the all-in quote. It wasn't. The RXT transfer switch was listed as an optional add-on. I didn't catch it until the invoice arrived. That cost an extra $1,100—and a 2-week delay while we sourced the switch. (Should mention: the RXT switch is required for the full load management feature on many Kohler units. A standard switch won't do it.)

What to do: The quote should explicitly list the transfer switch model. If it says "included" without a model number, ask for it. Confirm it's compatible with your generator model and your panel configuration.

Checkpoint: Is the transfer switch listed? With a model number? Is it the right series for your generator?

Step 3: Ask About the Pad and Vibration Isolation

I'm not a structural engineer, so I can't speak to every foundation code. What I can tell you from a procurement perspective: a generator pad is not always included in the base quote. Some quotes include a precast concrete pad. Some quote a stamped concrete pad. Some don't mention it at all.

The Kohler 14kW generator weighs around 460 lbs dry. The 100 kW units can weigh over 2,000 lbs. These need a proper base. I made the mistake of not asking about the pad on a residential install in Q1 2021. The installer quoted "pad not included" after the contract was signed. $450 added cost, plus a concrete pour delay.

What to do: Ask if the pad is included in the quoted price. If not, get a separate quote. Also ask about vibration isolation mounts—some installers include them, some don't. They're cheap insurance against noise complaints.

Checkpoint: Pad included? What type? Vibration isolation included?

Step 4: Get a Detailed Line-Item for Electrical and Permitting

This is the step I should have flagged earlier. The $3,200 mistake I mentioned? That was on a 60 kW commercial installation.

I ordered [QUANTITY] 60 kW units with what I thought was a complete installation package. The quote lumped "electrical work" and "permitting" into a single line item of $4,800 per unit. Sounded reasonable. Turned out the electrical work only covered connection to the existing transfer switch—not the conduit, not the breaker upgrades, not the ground grid adjustments. We discovered the issue when the city inspector showed up and flagged the grounding setup.

$3,200 of additional electrical work per unit, plus a 5-day delay. Straight to the project overrun column.

What to do: Ask for a breakdown of exactly what's included in electrical and permitting. Common items that get left out:

• Conduit and wiring from generator to transfer switch (if distance exceeds standard)
• Main panel upgrades or breaker replacements
• Grounding electrode system modifications
• Permit fees (these vary by jurisdiction)
• City inspection coordination

Checkpoint: Is electrical work itemized? Does it cover ground grid modifications? Is permitting a fixed fee or an estimate?

Step 5: Clarify Fuel Line Requirements

Natural gas or LP fuel supply connections are often quoted separately. I've seen quotes where the generator and installation are $9,500, but the fuel line extension from the nearest gas meter to the generator pad adds another $1,200 to $2,500, depending on distance and pipe sizing.

I assumed "fuel line connection" in a quote for a 14kW home generator meant running the line from the house. It meant connecting to a stub-out that was already installed. The gas plumber was a separate $1,800 expense I hadn't budgeted for. (I should add that this was in a jurisdiction that required a licensed gas fitter—it wasn't optional.)

What to do: Ask specifically: Does the quote include the gas line from the meter/regulator to the generator? Is it quoted based on a specific distance? What happens if the run is longer than estimated? Also ask about the pipe sizing—undersized gas lines will cause voltage drop issues under load.

Checkpoint: Fuel connection included? Distance allowance specified? Pipe sizing verified?

Step 6: Ask About Concrete and Landscaping Restoration

I'm mixing this up with another project—actually, no, this is right. The generator pad gets poured, and then there's a patch of torn-up yard, displaced gravel, or cut concrete walkway that needs to be restored. Many quotes exclude this.

On one commercial job, the installer poured a beautiful pad but left a 4-foot trench across the parking lot for the conduit. "Not included in our scope." The property owner was not pleased.

Around $1,500 added cost, give or take a few hundred. I'd have to check the exact figure.

What to do: Ask: Does the quote include restoration of ground surfaces disturbed during installation? Grass seeding? Concrete replacement? Gravel re-spreading? Get it in writing.

Checkpoint: Restoration of disturbed areas included? What's the scope?

Step 7: Confirm Warranty Activation Procedures

Kohler generators come with a factory warranty. But activation requires the unit to be registered. I know—this sounds basic. But I've seen cases where the installer didn't register the unit, and the owner found out when they needed a warranty claim.

What to do: Ask the installer who handles warranty registration. Is it done automatically upon installation completion? Do you need to do it yourself? Get the warranty certificate or documentation at installation completion, not after.

Checkpoint: Warranty registration steps confirmed? Documentation provided at completion?

Step 8: Ask About Load Testing and Commissioning

Some installers include a full load bank test during commissioning. Some only do a no-load start-up. A no-load test will tell you if the generator runs. It will not tell you if it can handle your actual load.

I've seen a 20kW unit pass a no-load test and then trip under load because the transfer switch was incorrectly configured for the load shedding scheme. That was a fun discovery during a critical facility test. Not.

What to do: Ask: Does the quote include a load bank test? For residential units, a load test using the home's actual circuits (if possible). For commercial units, insist on a load bank test at no less than 75% of rated capacity for at least 30 minutes.

Checkpoint: Load testing included? What type? What load percentage?

Step 9: Ask for a Spare Parts and Service Contact List

This is the step I add to my checklist after the third rejection in Q1 2024. I had created a pre-check list for a multi-unit commercial project, and I'd forgotten to include service and parts for the Kohler generator. The client asked me about it during the final review. I'd not even thought about it.

A generator quote is not just about the generator. It's about what happens after installation. Ask for:

• A list of authorized Kohler service providers in the area
• Contact information for the nearest Kohler dealer / service center
• Recommended spare parts kit for the specific model (filters, belts, etc.)
• Routine maintenance intervals and estimated costs

We've caught 47 potential errors using this checklist in the past 18 months. This step alone flagged three installations where the local service coverage was poor—we were able to adjust the service contract before signing.

Checkpoint: Service contact list provided? Parts kit recommended? Maintenance schedule included?

Two Things That Almost Always Get Overlooked

First: the remote monitoring setup. Kohler's OnCue system is standard on most new units, but the network connection (wired or wireless) isn't always installed by the generator installer. Ask who sets up the OnCue connection. I've seen quotes that assume the customer does this themselves.

Second: the noise requirements. If your installation is in a noise-restricted area (HOA, local ordinance), ask about sound-attenuated enclosures. The standard enclosure isn't quiet—it's weatherproof. Sound attenuation is an upgrade. The cost difference between a standard 14kW and a sound-attenuated version can be $500-1,000. I learned this after installing a unit within 30 feet of a neighbor's bedroom window.

I'm not a logistics expert, so I can't speak to every delivery nuance. What I can tell you from a procurement perspective is: get delivery dates in writing, with penalties for delays. Generator shortages in the post-2020 supply chain were real, and some installers quoted based on availability they didn't actually have. A written delivery commitment from the manufacturer or distributor is worth more than the installer's verbal promise.

This checklist has saved me—and my clients—thousands of dollars in unexpected costs. Print it out, check each box before you sign, and you'll avoid the most common surprises I've documented over 200+ orders.