Whole-Home Generator Installation in Denver, CO

Whole-home generator installation cost depends on generator size and brand, fuel type (natural gas vs. propane), transfer switch type, electrical panel work needed, fuel line modifications, concrete pad, permits, and labor. Essential-circuit systems (7–12 kW) are significantly less expensive than whole-home systems (22–26+ kW). Call (720) 255-9702 for a property-specific estimate — generator installation costs vary enough between homes that a useful number requires evaluating your specific situation.

Generator sizing depends on which loads you want to run during an outage and whether they'd run simultaneously. Essential-circuit backup (refrigerator, lights, outlets, furnace fan) typically requires 7–12 kW. Adding central AC or an electric range requires 20–26+ kW. An electrician calculates the actual electrical demand — particularly the motor-starting load for AC compressors and well pumps — rather than guessing based on home square footage.

A permanently installed automatic standby generator is connected to the home's electrical system through a transfer switch. When it detects a utility power interruption (typically within 10–30 seconds), it automatically starts the engine and the transfer switch transfers designated electrical loads from utility to generator power. When utility power is restored, the transfer switch returns loads to utility power and the generator follows its cool-down and shutdown sequence. The whole process is automatic — no manual action required.

Both are practical options. Natural gas is convenient for Front Range Colorado homes with gas service — no fuel storage, no refueling, runs indefinitely during extended outages. Propane works for properties without gas service and provides flexibility in tank sizing for long runtimes. Natural gas generators depend on the gas distribution system remaining operational, while propane gives you independent fuel supply. The right choice depends on your property, fuel availability, and how long an extended outage you're preparing for.

Yes — a properly sized whole-home system can support all of a home's electrical demand simultaneously. However, this requires a generator large enough for the home's peak electrical load, including motor-starting demands from AC compressors, well pumps, and other motors. Most homeowners choose to cover essential circuits or partial home coverage because whole-home systems are significantly more expensive and most outages are short enough that full coverage isn't needed.

A straightforward residential standby generator installation — concrete pad already in place, gas service at the house, panel has capacity for the transfer switch — typically takes one to two days for the installation itself. Site preparation (concrete pad), gas line modifications, panel work, utility coordination, and permit inspection scheduling adds time to the overall project timeline. We provide a project-specific schedule after evaluating your property.

Yes — permanently installed standby generators with automatic transfer switches start automatically when utility power fails. The generator monitors the utility voltage, detects the interruption, starts itself, and the transfer switch transfers power. This distinguishes standby generators from portable generators, which require you to physically set them up and connect them during an outage.

Yes. Generators require regular maintenance to remain ready for an outage: oil and filter changes, spark plug inspection, battery testing, fuel system inspection, and transfer switch testing. Most manufacturers recommend annual or biannual professional service plus regular automatic exercise cycles (the generator runs briefly under no load to keep the engine ready). A generator that hasn't been maintained may fail to start when you actually need it.

Yes — generator installation requires permits in most Colorado jurisdictions. Electrical work (transfer switch connection to the panel) requires an electrical permit. Gas line connections require a mechanical or gas permit. The concrete pad may require a building permit depending on the jurisdiction. Zenith Home Services handles permit applications as part of generator installation projects.

Zenith Home Services serves communities throughout Colorado's Front Range, including Denver, Aurora, Lakewood, Arvada, Westminster, Thornton, Centennial, Littleton, Parker, and surrounding communities. Call (720) 255-9702 to confirm availability for your address and discuss your generator installation project.