A standby generator quote can be a single number at the bottom of a page, or it can be a detailed list of everything the installer plans to do. The detailed version is much more useful. It lets you see where the money goes, compare two installers fairly, and spot anything that's missing. This guide covers the line items to expect, what tends to get left out, and the questions worth asking before you sign.
The line items to expect
Most installed prices break down into the same six parts. Here's what each one covers and what published sources say they typically cost.
Generator unit
The quote should name the brand, model and size in kilowatts. HomeGuide puts a whole house generator unit at $3,000 – $6,000 (HomeGuide, accessed Nov 2026) on its own, and This Old House at $1,458 – $8,239 (This Old House, accessed Nov 2026). If the model isn't named, ask, because two units of the same size can be priced very differently.
Installation labor
Labor covers setting the unit, connecting fuel and wiring, and the start-up. HomeGuide puts labor at $3,000 – $5,000 (HomeGuide, accessed Nov 2026), and Angi at $1,500 – $5,000 (Angi, accessed Nov 2026). Some installers fold labor into other line items. That's fine as long as the total is clear.
Transfer switch and electrical
The automatic transfer switch is what lets the generator take over by itself. HomeGuide lists automatic transfer switch installation at $600 – $2,500 (HomeGuide, accessed Nov 2026). If your panel needs work, Angi puts an electrical subpanel upgrade at $500 – $2,000 (Angi, accessed Nov 2026) when it's needed. The quote should say what kind of switch you're getting and whether it covers the whole home or selected circuits. See our transfer switch guide.
Gas line or propane
For natural gas, the quote should say how far the line runs from the meter. HomeGuide puts gas line installation at $12 – $25 per foot (HomeGuide, accessed Nov 2026), and This Old House puts a natural gas hookup at $15 – $20 per foot (This Old House, accessed Nov 2026). For propane, check whether a tank is included. HomeGuide puts propane tanks at $400 – $1,800 (HomeGuide, accessed Nov 2026). More detail in our gas line guide.
Pad
The base the unit sits on. HomeGuide puts a pre-cast concrete pad at $150 – $400 (HomeGuide, accessed Nov 2026).
Permit
If your area requires permits, the quote should say whether the installer pulls them and whether the fee is included. HomeGuide puts permits at $80 – $450 (HomeGuide, accessed Nov 2026) total, and Angi at $50 – $200 (Angi, accessed Nov 2026). Local fees vary; see our permit cost guide.
What's often missing
When two quotes are far apart, the gap often comes from something one installer included and the other didn't. Look for:
- Permit and inspection fees. Some quotes say "permit by owner" or leave it off.
- The pad. Occasionally priced separately or assumed to be existing.
- The full gas run. A quote may cover a short standard distance and charge extra beyond it.
- Gas meter or service upgrades. A generator can need more gas than your current meter supplies. Your installer and gas utility decide whether an upgrade is needed.
- Panel or electrical upgrades. An older or full panel can add cost.
- Trenching and restoration. HomeGuide notes complex jobs may need long trenches for conduit and gas pipe (HomeGuide, accessed Nov 2026).
- Propane tank. For propane installs, whether the tank is bought, leased or already there.
- Start-up, warranty registration and first service. Useful to know what's included.
Questions to ask your installer
These are fair questions for any installer, and a good one will be glad to answer them:
- Can you itemize the quote into unit, labor, electrical, gas, pad and permit?
- What exact model and size is this, and why that size for my house?
- Is this a whole-home or essentials transfer switch?
- How long is the gas run, and is all of it included?
- Will my gas meter or electrical panel need an upgrade? Is that included?
- Who pulls the permit, and is the fee included?
- Are you licensed for the electrical and gas work in my area?
- What warranty comes with the unit and with your labor?
Comparing two quotes
Put the quotes side by side, part by part. If one is higher, find which line makes up the difference. A higher labor or gas line number isn't necessarily a red flag; it might reflect a longer run or a tougher site. But you should know why.
Then compare the totals and parts with what homeowners near you paid. Our quote checker shows where your quote falls against local homeowner reports, part by part, or against published ranges when an area doesn't have enough reports yet. You can also look up costs for your ZIP.
What homeowners on this site paid
We're still collecting reports for a national median (0 of 3 needed).
A note on safety
This site doesn't give installation, code or safety advice. Use a licensed installer and follow your local codes and permit requirements.
Help the next homeowner
If you've had a generator installed, report what you paid, itemized if you can. Itemized reports are what make part-by-part comparisons possible.
Sources
- How Much Does a Whole House Generator Cost (2026), HomeGuide. Accessed Nov 3, 2026.
- How To Install an Automatic Standby Generator, This Old House. Accessed Nov 3, 2026.
- How Much Does a Whole-House Generator Cost? [2026 Data], Angi. Accessed Nov 3, 2026.
- Homeowner figures: approved reports on GeneratorCostCheck. How the data works.