Whole House Generator Cost in Denver: A Full Pricing Guide

The total price is not one flat fee. It is the sum of several parts that change from home to home.

Here are the main pieces that shape your whole house generator cost in Denver quote:

• The generator unit itself
• Fuel type and fuel line work
• The automatic transfer switch
• A concrete or composite pad
• Permits and inspection fees
• Labor and electrical connections

Each of these can swing the total by hundreds or thousands of dollars. We will walk through the big ones below.

Generator Size and Power Needs

Size is the single biggest cost driver. Generators are rated in kilowatts, and you pay more as the rating goes up.

Smart backup generator sizing starts with how much of your home you want to run. Some owners power only the basics, like the furnace, fridge, and a few lights. Others want the whole house, including the AC and electric range.

Here is a rough guide for home generators by size:

• 7 to 10 kW: essentials only, often $7,000 to $10,000 installed
• 14 to 18 kW: most of the home, often $10,000 to $14,000 installed
• 20 to 26 kW: large homes with heavy loads, often $13,000 to $20,000 installed

A pro performs a load calculation before quoting. This step keeps you from buying too small or paying for power you will never use.

Fuel Type: Natural Gas vs. Propane

Fuel choice affects both your upfront cost and your long-term running cost.

Natural Gas

Many Denver homes already have a natural gas line. That makes hookup simpler and cheaper, since the fuel feeds straight from the utility. You never refill a tank, which helps during long winter outages.

Propane

Propane works well for homes without a gas line. You will need a tank, which adds to the install. Propane stores well and burns clean, so it remains a solid pick for rural Front Range properties.

Either way, the gas or propane line work adds labor and materials to the job.

The Automatic Transfer Switch

The transfer switch is the brain of the system. It senses an outage, starts the generator, and shifts your home to emergency power within seconds. When utility power returns, it switches you back.

This part typically adds $500 to $2,000 to the project, depending on size and features. You should not skip it. A proper switch protects your home and keeps line workers safe during repairs.

Pad, Permits, and Site Prep

A few smaller items still add up.

• Pad work: Your unit needs a level base, usually concrete or composite. Budget a few hundred dollars here.
• Permits: Denver and surrounding counties require permits and inspections for this work. Fees vary by location.
• Trenching and wiring: Running gas and electrical lines from the unit to your panel takes labor, and longer runs cost more.

These steps keep your install legal, safe, and ready to pass inspection the first time.

Why Professional Installation Matters

A generator ties into your gas supply and your main electrical panel. That is serious, code-driven work. A licensed electrician handles the installation process properly, from load calculation to final inspection.

Professional Generac installers in Colorado will size the unit, set the transfer switch, and test the full system under load. They also pull the permits and ensure compliance with local codes, so you avoid fines and rework.

Skilled installers know how Denver weather plays into the job. They place the unit where snow and ice will not block airflow, and they confirm it starts reliably in the cold.

Why Denver Homes Benefit from Backup Power

The Front Range sees heavy snow, high winds, and rare ice storms. Any of these can knock out power for hours or days. When the grid goes down in January, your furnace stops, and pipes can freeze fast.

A backup system keeps the heat on, the fridge running, and the sump pump working. For many families here, that reliability is the whole reason to invest.

Tips for Choosing a Generator

A little planning saves money and stress. When choosing a generator, keep these points in mind:

• List your must-run items first. This sets your size and your budget.
• Check your gas service. A natural gas line often lowers the installation cost.
• Ask about warranties. Longer coverage protects your investment.
• Plan for upkeep. Generators need yearly service to stay ready.

Match the unit to your real needs, not to the biggest model on the shelf.

Pair Your Generator with Other Electrical Upgrades

A generator project is a smart time to review the rest of your electrical system. If your panel is older, it may need attention before the new load ties in. Our team handles that under electrical remodeling services, so the panel and generator work are handled together.

While we are on site, it also makes sense to confirm the status of your safety devices. Pair the job with smoke detector installation so your home has reliable alerts during any outage.

Need other residential work across the metro? Our local crews also help with projects like hot tub wiring in Englewood and similar electrical jobs, so we know Denver-area homes well.