Who Installs Whole-House Generators?

A whole-house standby generator is usually installed by a generator contractor or dealer, or by an electrical contractor with standby-generator experience. Because a permanent generator connects to the home’s electrical system and to a fuel supply, more than one trade may be involved. A single turnkey company may coordinate the entire project, or the electrical, fuel, site-work, and service portions may be handled by separate contractors.

For a homeowner, the useful question is not only who sells the generator. It is who is responsible for the electrical connection and transfer equipment, the natural-gas or propane work, site preparation, permits and inspections, startup testing, and future service. Contractor licensing and permit rules vary by state and locality, so verify the required credentials with the local permitting authority and applicable licensing agency before work begins.

On Home Power Helper, “whole-house generator” generally refers to a permanently installed standby generator intended to support much or most of a home’s normal load. That label does not guarantee that every large appliance can run at the same time; final sizing and load management are separate design decisions. See the whole-house generator guide and generator sizing guide for that planning work.

Who typically handles each part of a generator project?

The exact division of labor depends on local licensing rules and the installer’s business model. The table below shows the roles homeowners commonly encounter, not a universal licensing rule.

Is a generator dealer the same as an electrician?

No. A manufacturer-authorized generator dealer and a licensed electrical contractor are different credentials. Dealer status is manufacturer-specific and may reflect access to product training, sales, parts, service programs, or warranty support. An electrical license or other local authorization covers the legal scope of electrical work in a jurisdiction.

Those roles can exist inside the same company. A generator dealer may employ licensed electricians and fuel professionals, or it may subcontract part of the installation. An electrical contractor may also be an authorized dealer for one or more generator brands. The business name alone does not tell you who will perform each regulated part of the work.

Manufacturer programs also differ. Generac, for example, describes dealer tiers with different sales, installation, service, and technician capabilities; some dealer designations may sell products without offering full installation and service. That makes it worth confirming the exact scope of the specific company you are considering rather than assuming every authorized dealer provides the same services.

Turnkey installer or separate contractors?

A turnkey generator installer can simplify coordination. One company may survey the home, recommend equipment, coordinate the electrician and fuel contractor, handle site work, manage permits, commission the system, and provide maintenance. This can reduce the number of contracts and scheduling handoffs.

Separate contractors can also be a workable arrangement. You may already have an electrician, propane supplier, plumber, or general contractor you trust. In that case, make sure one party is clearly responsible for coordinating the design assumptions, schedule, permits, inspections, and final system startup so the project does not become a collection of disconnected scopes.

Neither arrangement is automatically better for every home. Compare the complete installed scope, not just the generator price or the number of companies involved.

What should a generator site evaluation cover?

A useful site evaluation connects the generator to the actual home. It should give the installer enough information to identify the project scope before a final quote is treated as complete.

• Backup goals and loads. The installer should ask what must remain available during an outage and whether the goal is essential-load backup, broad whole-home coverage, or a system that uses load management.

• Generator and transfer strategy. The proposal should identify the intended generator and transfer/control approach rather than treating the generator as a stand-alone appliance. See the transfer-switch guide.

• Electrical system. The installer should evaluate the panel, service equipment, transfer-switch location, available space, and any electrical changes that may be part of the project. A visible panel rating alone is not enough to determine whether an upgrade is required. See Do You Need a Panel Upgrade for a Generator?.

• Fuel source. Natural gas and propane installations depend on the available fuel system and the exact generator. The qualified fuel professional should verify the fuel-side design rather than assuming an existing gas line, meter, tank, or regulator is adequate.

• Placement and property conditions. The proposed location should be checked against the exact manufacturer’s installation instructions, access and service needs, exhaust and openings, drainage or flood exposure, property constraints, and local rules. See the generator placement guide.

• Routing and site work. The quote should make clear whether trenching, conduit, fuel-line routing, concrete or listed pads, landscaping repair, wall penetrations, or other restoration are included.

• Permits and inspections. The contractor should explain which permits and inspections apply locally and who is responsible for each one. See the permits and inspections guide.

• Startup, handoff, and service. The scope should include final system testing or commissioning appropriate to the equipment, a homeowner handoff, and a clear path for maintenance and product service.

These are planning inputs only. Do not remove electrical-panel covers, open service equipment, alter transfer equipment, or modify gas or propane piping to collect information for a quote.

Do you need both an electrician and a plumber or gas fitter?

Often, the project includes both electrical work and fuel work, but that does not mean the homeowner must hire two companies independently. A turnkey generator installer may employ or coordinate the required trades.

The electrical side includes the transfer equipment, generator conductors, control wiring, and any panel or service work in the approved design. Manufacturer instructions for standby transfer equipment commonly call for qualified or licensed electrical personnel and compliance with applicable codes.

The fuel side depends on whether the generator uses natural gas or propane and on local licensing rules. A plumber, gas fitter, mechanical contractor, propane supplier, or another authorized fuel professional may be responsible. Local permit systems can treat the electrical, gas, structural, or planning portions as separate scopes, which is why a national page cannot name one universal license or permit package.

How to compare whole-house generator installers

Ask each company to quote the same project scope as closely as possible. A lower number is difficult to compare if one proposal includes fuel work, permits, trenching, load management, and commissioning while another is mostly equipment and electrical labor.

• Licensing and responsibility. Verify the license or authorization required for the electrical work, identify the fuel contractor when applicable, and ask whether subcontractors will be used.

• Manufacturer relationship. If a company claims to be an authorized dealer or factory-trained service provider, verify that status with the manufacturer. Treat manufacturer credentials as product-specific qualifications, not a substitute for local trade licensing.

• System-sizing method. Ask what information is used to determine generator capacity and whether the proposal assumes all loads, selected loads, or load management. Be cautious of a recommendation based only on home square footage.

• Transfer and electrical scope. Confirm what transfer equipment, panel work, service work, load-management hardware, and inspection responsibilities are included.

• Fuel scope. Confirm who is responsible for natural-gas or propane work, any utility or supplier coordination, and which fuel-side items are included or excluded.

• Site work and restoration. Look for pad or base work, trenching, conduit, access, landscaping or hardscape repair, and other site-specific items that can change the installed scope.

• Permits and inspections. Ask who obtains permits, who schedules inspections, and what happens if the authority requires a correction or additional documentation.

• Commissioning and homeowner handoff. Confirm that the system will be tested after installation and that you will receive operating, maintenance, and emergency-shutdown information appropriate to the equipment.

• Workmanship, product warranty, and service. Separate the installer’s workmanship coverage from the manufacturer’s product warranty, and ask who will service the generator after installation.

The separate questions-to-ask guide is the better place for a printable contractor interview checklist. This page is meant to help you understand who should be involved and what a complete scope looks like.

Warning signs that a quote may be incomplete

An incomplete quote is not always a bad quote; sometimes a contractor is intentionally pricing only its portion of the project. The problem is when the missing scope is not obvious.

• No clear electrical or fuel responsibility. The proposal does not identify who will perform regulated electrical or fuel work.

• Sizing from square footage alone. The recommendation does not address the loads you want to support, large motor/compressor starting demands, or load management.

• Transfer equipment is vague. The quote names a generator but does not clearly describe the transfer/control equipment or which part of the home will be backed up.

• Permits are ignored or discouraged. The contractor cannot explain local permit responsibility or suggests avoiding a permit that the local authority requires.

• Placement is treated as universal. The contractor quotes one setback or location rule without checking the exact equipment instructions and local requirements.

• Major site work is missing. Trenching, concrete or listed pad work, fuel routing, restoration, or access constraints are not addressed.

• No final testing or service path. The proposal is unclear about startup, inspection completion, homeowner handoff, maintenance, or who will handle future product service.

Who should you call first?

• You are still comparing system options. Start with a generator installer/dealer or electrical contractor that regularly evaluates standby-generator projects and can explain both equipment and installation dependencies.

• You already have an electrician you trust. Ask whether the company routinely installs permanent standby generators, transfer equipment, and the specific type of system you are considering, and how it coordinates fuel work and commissioning.

• Propane will be the fuel source. Involve the propane supplier or qualified LP contractor early enough to confirm tank, regulator, and supply responsibilities before the generator quote is treated as complete.

• Your panel or service may be a constraint. Have the electrical side evaluated before assuming a generator automatically requires - or avoids - a panel or service upgrade. See Do You Need a Panel Upgrade for a Generator?.

• You have already chosen a generator brand. A manufacturer-authorized dealer can be a useful starting point for product-specific installation and service, but still verify the local trade credentials and scope of the actual installer.

What a complete proposal should make clear

Before signing, you should be able to tell what equipment is being proposed, what loads or design goal it is intended to support, who performs each part of the work, what permits and inspections are included, what site and fuel work is included, and what happens after installation.

If two proposals are hard to compare, ask both companies to identify exclusions in writing. The whole-house generator cost guide and installation process guide can help you separate equipment price from the rest of the installed project.

Related guides

• Home Power Project Planning - Parent planning hub

• Whole-House Generators: A Homeowner’s Guide - System overview

• What Size Generator Do I Need for My House? - Sizing and load-planning handoff

• Whole-House Generator Cost - Installed-cost factors

• Generator Transfer Switches: A Homeowner’s Guide - Transfer/control equipment

• Do You Need a Panel Upgrade for a Generator? - Electrical-readiness question

• Questions to Ask a Generator Installer - Contractor interview checklist

• Whole-House Generator Installation: What to Expect - Installation sequence and scope

The bottom line

A whole-house generator project is usually led by a generator installer/dealer or an electrical contractor with standby-generator experience, with qualified electrical work at the center of the installation and separate fuel-gas or propane expertise often involved. One company may coordinate everything, or several trades may share the work.

Choose the project team by verifying who is responsible for each scope, which local credentials are required, how the system will be sized and transferred, what fuel and site work are included, who handles permits and inspections, and who will commission and service the generator. A clear, complete scope is more useful than a company label alone.

Sources

Source access date: September 24, 2026.

1. Generac Power Systems - Can I install my own home standby generator? (opens in a new tab). Published December 4, 2025; accessed September 24, 2026.

2. Generac Power Systems - 100/200A Automatic Transfer Switch Owner’s Manual (opens in a new tab). Current manufacturer manual; publication/update date not stated on the retrieved page; accessed September 24, 2026.

3. Generac Power Systems - Find the Right Generac Dealer for Your Home (opens in a new tab). Current web guidance; accessed September 24, 2026.

4. KOHLER Home Energy - How to Buy (opens in a new tab). Current web guidance; accessed September 24, 2026.

5. Cummins - Buying Your Home Generator Online (opens in a new tab). Current web guidance; accessed September 24, 2026.

6. City of San Jose, California - Standby Generator (opens in a new tab). Updated April 15, 2026; accessed September 24, 2026.

7. Miami-Dade County, Florida - Generator Permits (opens in a new tab). Current web guidance; accessed September 24, 2026.