What's Included in a Standby Generator Installation: A Scope Breakdown

What a turnkey installation covers

A whole-home standby generator installation is a turnkey project: a licensed contractor supplies and installs all the equipment, runs the electrical and fuel connections, pulls the permits, and commissions the finished system. A complete quote should cover six distinct components. Knowing what each one is and why it belongs in the price makes it easier to compare bids that come back at very different numbers.

The generator unit

The generator is the outdoor unit that produces electricity when grid power goes out. Residential standby models range from roughly 7.5 kW for essential-circuit coverage to 26 kW and above for whole-house coverage, with larger liquid-cooled commercial units going higher still. The unit itself is often the single largest line item in the quote. Cost varies significantly by brand, capacity, and fuel type. See our generator sizing guide to understand what size your home actually needs.

The automatic transfer switch (ATS)

The ATS is the panel that connects the generator to your home's electrical system. When the utility goes out, the ATS detects it, signals the generator to start, and transfers your home's load automatically within seconds. When utility power comes back, the ATS returns your home to the grid and shuts the generator down. An ATS is required by electrical code: a quote that doesn't include one is not a complete turnkey installation.

Two main types exist. A whole-home transfer switch handles the entire electrical panel and is paired with a generator sized to run everything. A managed standby panel backs up a selected subset of circuits and uses a load management module to rotate coverage within the generator's capacity. Ask which type the quote includes and why the contractor is recommending it for your home and generator size.

Electrical work

Connecting the ATS to your home's service entrance requires licensed electrical work: running conductors between the ATS and the main panel, potentially relocating breakers, and wiring the generator's control connections. This work is labor-intensive and accounts for a significant share of the installation labor cost.

Some homes also need a main panel upgrade if the existing panel is at capacity or undersized for the added service. That work is typically quoted as a separate add-on rather than included in a base price, so ask explicitly whether the quote assumes your existing panel is adequate or whether a panel upgrade is factored in.

Fuel line work

A natural-gas or propane generator needs a dedicated fuel line from your gas meter or propane tank to the generator's location. The length of that run affects cost directly: a generator placed near an existing gas meter keeps this simple. A generator sited far from the meter, or a home where the gas service itself needs a BTU-capacity upgrade, will cost more.

Most contractors include a standard run length in their base price (often around 20 to 30 feet) and charge by the foot beyond that, so confirm what the base run covers before signing. If the quote assumes natural gas but your home isn't on a gas line, see our natural gas vs propane guide for the propane-tank cost and logistics.

Battery, startup, and commissioning

Standby generators start automatically using a 12-volt battery, similar to a car battery. The installation includes the battery and battery charger, an initial startup and load test to confirm the system works, and configuration of the ATS's automatic weekly self-test cycle. A full commissioning run should be included in any complete installation. If the quote doesn't mention startup and commissioning, ask whether it's included or quoted separately.

Permits and inspections

Most municipalities require an electrical permit for a permanently installed standby generator, and often a separate gas permit as well. A final inspection by the local electrical inspector (and sometimes a gas inspector) is typically required before the installation is considered complete. A licensed contractor handles filing, coordination, and scheduling; the permit fee itself is usually included in a turnkey quote.

Skipping the permit is not a cost-cutting measure worth taking. Unpermitted generator work can create problems with homeowner's insurance coverage and can complicate a future home sale. See our permit requirements guide for what your state and city require.

What typically adds cost beyond the base quote

A base turnkey price usually assumes a reasonably straightforward site. Common add-ons:

• Longer runs: extra footage on the fuel line or electrical conduit beyond whatever length the quote's base price includes.
• Main panel upgrade: if your existing panel is undersized or at capacity.
• Load management module: if the quote uses a managed standby panel covering selected circuits, a load module adds capacity to rotate additional circuits in.
• Propane tank: the tank itself is typically supplied and quoted by a propane dealer, not the generator installer, and is a separate cost.
• Concrete pad: most installations use a prefabricated composite pad, which is typically included. A poured concrete pad costs more.
• Permit fees in high-cost jurisdictions: some cities charge meaningfully higher permit fees than others; this is sometimes a quoted add-on rather than included.

Using this to compare quotes

Once you have two or more quotes, confirm they each cover the same scope before comparing prices. A lower quote that excludes permits, assumes an existing panel is fine when it isn't, or prices a 20-foot gas run when your site actually needs 60 feet, is not a real comparison. The installation checklist has a question-by-question guide to verifying each of these points with every installer before you sign.

If you want to narrow down which installers to get quotes from, the Find installers near you directory shows license-checked installers by city, with their brand certifications, services, and permit experience visible on each card.