Backup power generator: cost & ROI
Installing a whole-home or partial-home standby generator, wired to run automatically during an outage. A newer entrant to the top-ROI tier — it recoups nearly its full cost nationally, and can exceed 100% in storm- or outage-prone regions.
Worth knowing: ROI is unusually region-dependent: it exceeds 100% of cost in hurricane-prone and storm-affected markets, but runs meaningfully lower where grid power is reliable year-round.
“Net cost after resale” = project cost − resale value added. It's the part you don't recoup at sale, not a loss — most renovations cost more than they return, with the difference buying you the use and enjoyment of the upgrade.
How much does a backup power generator cost in 2026?
A permanently installed standby generator keeps a home's power on automatically during an outage — a growing priority as extreme weather and grid instability become more common. In 2026 a whole-home standby generator averages around $13,500 nationally, ranging from roughly $8,000 for a partial-home unit to $20,000+ for a large whole-home system with a full transfer switch. It recoups about 95% of its cost on average, and can exceed 100% in storm- and outage-prone regions.
Unlike a portable generator, a standby unit is wired into the home via an automatic transfer switch and runs on natural gas or propane, starting itself within seconds of an outage. Cost is driven by the generator's capacity (kilowatts), the transfer switch, the gas or propane hookup, and a concrete pad. The resale return is unusually region-dependent: in hurricane- and storm-affected markets buyers value guaranteed power highly, while in areas with reliable grids the premium is smaller.
| System | Typical installed cost | Notes |
|---|---|---|
| Partial-home (10–14 kW) | $8,000–$11,000 | Powers essentials — heat, fridge, key circuits. |
| Whole-home (national avg, 17–22 kW) | $12,000–$16,000 | Runs most of the house automatically. |
| Large whole-home (24+ kW) | $16,000–$22,000 | Larger home, full load, upgraded transfer switch. |
| Premium / complex install | $22,000–$30,000+ | Long gas runs, difficult siting, high-capacity systems. |
Ranges are 2026 US market figures compiled from industry cost guides; your local quote depends on size, finish and labour rates.
What a backup power generator typically includes
- Standby generator (17–22 kW)
- Automatic transfer switch
- Concrete pad and gas or propane line hookup
- Permitting and electrical inspection
Pro tip: Lead with the resilience angle in storm-prone or grid-unstable regions — that's where this project's return climbs highest, sometimes above 100%.
How backup power generator compares
Ranked by share of cost recouped at resale, backup power generator is #8 of 32 projects we track.
What affects the cost
- Generator capacity
- Sizing (kW) to run essentials versus the whole home is the main cost driver.
- Transfer switch
- An automatic transfer switch — whole-home or essential-circuits — is a required part of the system.
- Fuel hookup
- Tying into natural gas or setting up propane, plus the distance of the run, affects cost.
- Siting & pad
- A concrete pad, permitting, and the distance from the panel and gas source all add to the install.
Backup power generator cost by region
Costs vary by market. These are midrange estimates adjusted for regional price levels — always confirm with local quotes.
Full cost-by-location table (with ROI)
| Location | Estimated cost | Recouped |
|---|---|---|
| US National Average | $13,500 | 95% |
| New York, NY | $17,600 | 95% |
| Los Angeles, CA | $16,500 | 95% |
| Chicago, IL | $14,900 | 95% |
| Houston, TX | $13,200 | 95% |
| Phoenix, AZ | $13,100 | 95% |
| Miami, FL | $14,600 | 95% |
| Seattle, WA | $16,500 | 95% |
| Denver, CO | $14,600 | 95% |
| Atlanta, GA | $13,200 | 95% |
| Boston, MA | $17,000 | 95% |
| San Francisco, CA | $18,600 | 95% |
| London, UK | £11,200 | 95% |
| Manchester, UK | £9,600 | 95% |
| Birmingham, UK | £9,400 | 95% |
| Edinburgh, UK | £10,500 | 95% |
| Dublin, IE | €13,400 | 95% |
| Toronto, CA | C$19,400 | 95% |
| Vancouver, CA | C$20,700 | 95% |
| Sydney, AU | A$22,600 | 95% |
| Melbourne, AU | A$20,900 | 95% |
| Auckland, NZ | NZ$24,100 | 95% |
| Washington, DC | $15,300 | 95% |
| Philadelphia, PA | $15,500 | 95% |
| Minneapolis, MN | $14,400 | 95% |
| Austin, TX | $12,000 | 95% |
| Dallas, TX | $11,700 | 95% |
| Glasgow, UK | £9,500 | 95% |
| Bristol, UK | £10,100 | 95% |
| Calgary, CA | C$17,900 | 95% |
| Montreal, CA | C$16,600 | 95% |
| Brisbane, AU | A$21,500 | 95% |
| San Diego, CA | $15,900 | 95% |
| Portland, OR | $15,300 | 95% |
| Nashville, TN | $12,800 | 95% |
| Charlotte, NC | $12,400 | 95% |
| Tampa, FL | $13,200 | 95% |
| Leeds, UK | £9,400 | 95% |
| Perth, AU | A$22,000 | 95% |
| Adelaide, AU | A$18,500 | 95% |
| Wellington, NZ | NZ$22,900 | 95% |
| Christchurch, NZ | NZ$21,600 | 95% |
Before you spend
- Get 3 written quotes from licensed local contractors before committing
- Match finishes to what's normal for your neighbourhood, not above it
- Keep a 10–15% contingency for surprises once work starts
- Avoid overcapitalising — check what comparable homes nearby actually sell for
- If you're selling soon, weigh resale timing against how long the project will take
Frequently asked questions
How much does a whole-home generator cost in 2026?
About $13,500 on average, from roughly $8,000 for a partial-home unit to $20,000+ for a large whole-home standby system.
Does a standby generator add value?
It recoups around 95% of its cost on average and can exceed 100% in storm- and outage-prone regions where buyers highly value guaranteed power.
Standby vs portable generator?
A standby unit is permanently wired in and starts automatically on gas or propane; a portable is cheaper but manual and limited. Only standby systems add meaningful resale value.
What size generator do I need?
A 10–14 kW unit covers essentials; 17–22 kW runs most of a typical home. An electrician sizes it to your home's load and the circuits you want backed up.
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Methodology
Figures are national midrange “Cost vs. Value” averages adjusted for finish, scope and region. They are planning estimates, not quotes or appraisals, and lean toward US/UK/Canada/Australia mid-markets. Reviewed June 2026. See our full methodology →
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