The short answer: a whole-house (standby) generator typically costs somewhere around $8,000 to $16,000 or more once it is installed, according to published 2026 estimates, and the final number depends mostly on the generator’s size, your fuel setup, the transfer switch and how much electrical and gas work your home needs. Below is what goes into that price, the questions that move it up or down, and how to get accurate quotes.
What published estimates say
Prices vary by region and by home, so treat any single number with caution. A few public reference points as of 2026:
- One major standby generator manufacturer’s own installation guide puts the typical total for a home standby generator, including the unit, at roughly $8,000–$16,000.
- A large home-improvement retailer’s installation cost guide puts installation alone at roughly $5,000–$12,500, depending on the unit size.
- Home-services marketplaces list smaller portable generators (about 1–7.5 kW) at roughly $500–$2,000, before any transfer switch or electrician work.
These are broad ranges, not quotes. The only way to know your price is to get an on-site estimate from licensed installers in your area.
What makes up the total cost
1. The generator itself
Size is the biggest factor. Home standby units are sold across a wide range of kilowatt (kW) ratings, from smaller units that cover essential circuits to large units that run a big home with central air. Larger units cost more, and air-cooled versus liquid-cooled designs differ in price, noise and expected service life. Our guide to what size generator you need explains how to estimate your load before you talk to an installer.
2. The transfer switch
Every standby generator needs an automatic transfer switch (ATS) that disconnects your home from the grid and connects it to the generator. Switches are rated for your service size (for example 100, 200 or 400 amps), and whether they cover the whole panel or only selected circuits. One installer’s 2026 price guide lists a 200-amp service switch at roughly $800–$1,500 and a 400-amp switch at roughly $1,200–$2,200 installed. Some systems also use load-management modules that briefly shed big loads, which can let you buy a smaller generator.
3. Electrical work
A licensed electrician wires the generator to the transfer switch and the switch to your panel. Older panels, long wire runs from the generator location to the panel, or a service upgrade can add to the bill.
4. Fuel: natural gas or propane
If your home has natural gas, a plumber or gas fitter runs a line to the generator, and your gas meter may need to be checked or upgraded so it can supply the generator and your other appliances at once. Without natural gas, you will need a propane tank (bought or leased) sized for the run time you want, plus the line to the generator.
5. Site preparation
Standby generators sit on a pad outside, at distances from windows, doors, vents and property lines set by the manufacturer and local code. Placement, a concrete or composite pad, and any grading or trenching all affect cost.
6. Permits and inspections
Most areas require electrical and gas permits and an inspection. Some homeowners’ associations also need to approve placement. Your installer usually handles the paperwork, and the fees are part of the quote.
7. Maintenance over time
Standby generators run short self-tests and need periodic service such as oil, filters and spark plugs. Many owners buy a service plan or extended warranty. Factor this into the long-term cost, not just day one.
What pushes the price up (or down)
| Costs more | Costs less |
|---|---|
| Whole-home coverage including central air | Essential circuits only |
| Long distance from generator to panel or gas meter | Generator placed close to both |
| Gas meter or electrical service upgrades | Existing service that is already adequate |
| Propane tank purchase and installation | Existing natural gas service |
| Difficult site (slope, rock, tight spaces) | Flat, open, easy-access site |
| High-cost labour market | Lower-cost region, off-season scheduling |
Cheaper alternatives to a full standby system
If the total is more than you want to spend, these options cover many households for less:
- A portable generator with a transfer switch or interlock kit. An inverter or dual-fuel generator connected to selected circuits by an electrician can run the fridge, furnace, well or sump pump and lights. You start it manually.
- A portable power station or solar generator. A portable power station or solar generator covers essentials silently, indoors, with no fuel. Larger systems can connect to a transfer switch.
- A home battery system. A whole-home battery backup switches over automatically like a standby generator, uses no fuel, and can pair with solar. Up-front cost varies widely with capacity.
Our side-by-side guide to standby vs portable vs solar generators helps you compare.
How to get accurate quotes
- Know what you want covered. Whole home, or a list of essential circuits.
- Get at least two or three on-site quotes from licensed, insured installers. Ask each to show the load calculation they used to size the unit.
- Compare line by line: unit, transfer switch, electrical, gas or propane, pad, permits, start-up and first service.
- Ask about warranty and service: what is covered, for how long, and who does repairs.
- Check rebates and timing. Some utilities and manufacturers run seasonal promotions. Installers are often busiest right after big storms, so planning ahead helps.
Questions to ask before you sign
- What size unit are you recommending, and what load calculation is it based on?
- Will it cover the whole home, or which circuits exactly?
- Does the quote include the transfer switch, pad, gas or propane work, permits and inspection?
- Will my gas meter or electrical service need an upgrade, and is that in the price?
- Where will the unit sit, and does that placement meet the manufacturer’s clearances and local code?
- Who registers the warranty, and who do I call for service and repairs?
- How long from deposit to a working system, and what could delay it?
A good installer will answer all of these in writing. If a quote is much lower than the others, check which of these items it leaves out.
FAQ
How much does it cost to install a whole house generator?
Published 2026 estimates put installation alone at roughly $5,000–$12,500 depending on unit size, and the full project, including the generator, at roughly $8,000–$16,000 or more. Your quote depends on your home, fuel source and local labour costs.
Is a natural gas or propane generator cheaper?
If your home already has natural gas service, it is usually simpler and cheaper to install because there is no tank to buy or lease. Propane adds a tank and refills but works anywhere.
Does a whole house generator add value to a home?
Many buyers see backup power as a plus, especially in outage-prone areas, but how much it adds varies by market. Ask a local real estate agent rather than relying on national averages.
How long does installation take?
The physical install is often done in one to a few days, but permits, inspections, gas utility work and equipment availability can stretch the full timeline to several weeks.
What are the ongoing costs?
Fuel when it runs, periodic maintenance, and optionally a service plan or extended warranty. Self-tests use a small amount of fuel.
Want help thinking through the options before you call installers? Email us.
Price ranges above are published estimates from manufacturer, retailer and home-services guides as of 2026, not quotes from Home Backup Supply. Actual costs vary by location and home.
This guide is general information, not electrical advice. Anything connected to your home’s wiring should be installed by a licensed electrician and checked against local code.