Whole House Generator Cost in 2026

By the HomePriceFacts Research Team · Last updated: November 11, 2026 · Prices checked against published 2026 standby generator cost data

A whole-house standby generator costs $6,000 to $11,000 installed on HomeGuide's 2026 figures, or $8,000 to $16,000 on Generac's own published range — and the first number you meet online is probably wrong. Angi's headline average of $5,154 blends portable and partial generators into the same dataset as whole-house standby units; the same Angi page later gives $17,000 as the whole-house-only average. This guide separates the unit from the install, prices by size and fuel from sources that agree, and explains why two quotes for the "same" 22 kW generator can sit $5,000 apart.

Start with the scope question, because it is the whole story. A "generator" in the cost guides can mean three different machines: a portable unit you wheel out of the garage, a partial-house standby that powers selected circuits, or a whole-house standby that powers the full panel through an automatic transfer switch. Angi prices the portable at $500–$2,000, the partial at $2,000–$6,300 and the whole-house unit at $5,000–$18,000 — and then averages all three together into its $5,154 headline. HomeGuide keeps them apart: its whole-house installed figure is $6,000–$11,000, with the unit alone at $3,000–$6,000 and labour at $3,000–$5,000. Generac, the brand whose 22 kW unit is named in nearly every guide, publishes $8,000–$16,000 installed for a standard whole-house system and says the generator itself is roughly one-third of the total — the other two-thirds is installation, equipment and materials. None of these sources is wrong about its own scope. They are measuring different mixes of the same word, and the honest number for your house depends on one thing above all: how many kilowatts you actually need, and how far the unit sits from your panel and gas meter.

That is also why the cheapest quote is not always the comparable one. A $6,000 install and a $16,000 install can both be fair prices — the first for a 14 kW unit mounted beside the panel and meter, the second for a 26 kW unit at the far end of the property with a long gas run. Ask every bidder the same three questions: what size in kW, is the automatic transfer switch included, and is the gas line in this number? The answers will tell you which dataset your house belongs to.

What the price normally includes

• The generator unit itself — a 22 kW Generac lists at $6,119, or $6,979 with a 200-amp transfer switch (October 2026 MSRP)
• Automatic transfer switch — about $1,200 of the install, per Angi; $600–$2,500 installed, per HomeGuide
• Installation labour — $1,500–$5,000 (Angi) or $3,000–$5,000 on average (HomeGuide), rising to $5,000–$12,000+ for long runs or systems over 20 kW
• Concrete pad — about $1,000 for a 3×6 ft pad at $50–$75 per square foot (Angi); a precast pad runs $150–$400 (HomeGuide)
• Permits — $50–$200 (Angi) or $80–$450 (HomeGuide)
• NOT usually included: gas line work ($12–$25 per foot, HomeGuide; $15–$20 per foot, This Old House/Angi), a propane tank ($400–$1,800, HomeGuide), or electrical panel and subpanel work ($500–$2,000, Angi)

Generator cost by size (unit only)

The 22 kW size is the standard whole-house unit — it is the size Generac's own installed range is built around, and the size every installer quote tracker follows. Its unit price is unusually well documented: Generac's October 2026 list price for the 22 kW (model 7042) is $6,119, and $6,979 with the 200-amp transfer switch (model 7043), confirmed across dealer listings. Add installation and the published installed range is $8,000–$16,000 (Generac); independent installer quote tracking put the median installed 22 kW quote at $11,200 in November 2026, with most quotes at $9,000–$13,000. A 26 kW Generac lists at $7,159 for the unit, $8,219 with the switch. Forbes Home's figures above are corroborated by secondary citations — its live page could not be opened directly in this pass, so treat its bands as a cross-check on Angi and HomeGuide, not as the lead source.

Installed cost by scenario

HomeGuide's own installed range, $6,000–$11,000, sits below Generac's $8,000–$16,000 — and the gap is a data-age gap as much as a scope gap. HomeGuide's page was last updated December 30, 2025, about 316 days before this guide was written, and its Generac unit prices ($5,000 for a 22 kW) are well below the October 2026 list price of $6,119. Generac's range is the fresher anchor; HomeGuide's is the lower bound. Neither should be quoted alone.

What drives the price up or down

Size in kilowatts

The unit is roughly one-third of the total installed cost (Generac), so every step up in size moves the whole job. A 7–10 kW unit at $2,000–$3,000 covers the essentials — fridge, lights, well pump and a few circuits — while a 22 kW unit at $4,500–$12,000 covers the full panel including central air. The jump from 14 kW to 22 kW roughly doubles the unit price, which is why an electrician's load calculation matters more than the catalogue: a house that only needs 16 kW should not pay for 26.

Fuel type

HomeGuide prices units (2–24 kW) by fuel at $3,000–$6,000 for natural gas, $2,000–$6,000 for liquid propane and $5,000–$18,000 for diesel. Natural gas is the cheapest to run and needs no tank — but only where a gas line is available, and the line itself costs $12–$25 per foot (HomeGuide) or $15–$20 per foot (This Old House/Angi), plus $800–$3,000 if the gas line needs upsizing. Propane needs a tank at $400–$1,800 (HomeGuide) and costs far more per day to burn (see running costs below). Diesel units cost the most to buy and are rare in residential work. Our solar guide prices the other backup option — a battery — for homes weighing solar plus storage.

Transfer switch and electrical work

The automatic transfer switch is the part that makes a standby a standby: it detects the outage, starts the generator and switches the house over without anyone touching anything. Angi puts the switch at about $1,200 of the install; HomeGuide's installed band is $600–$2,500. A manual switch for a portable unit is far cheaper ($400–$2,500 as a standalone job, HomeGuide), which is the whole price logic of the portable route. Panel work adds up separately: a subpanel upgrade runs $500–$2,000 (Angi), a new circuit $570–$1,000, and an electrician's hourly rate is $50–$130 (HomeGuide). The same load calculation that sizes the generator decides whether the panel can take it — our EV charger guide explains how that calculation works, and why a 200-amp panel usually has room while a pre-2000s 100-amp panel often does not.

Gas line, pad and distance

Distance is the quiet multiplier. A unit mounted beside the panel and the gas meter is a short wire run and a short gas run; a unit at the far end of the property, or one that needs trenching, is HomeGuide's $9,500–$24,000 band. The concrete pad is about $1,000 for a 3×6 ft pour at $50–$75 per square foot (Angi), or $150–$400 precast (HomeGuide). Long runs also push labour: HomeGuide's labour band jumps from $3,000–$5,000 to $5,000–$12,000+ for long distances or systems over 20 kW.

Location and permits

Florida is the standout state layer — and it switches the noun. Florida pages say "whole home generator cost", not "whole house", and price by size with hurricane and county-permit language. Permits run $50–$200 on Angi's figures and $80–$450 on HomeGuide's. Storm states are also where the real quotes in the $14,000–$20,000 band originate — though no verifiable owner thread could be found to cite for that figure in this pass, so this guide does not publish it as a price. Our Florida HVAC guide covers the other half of hurricane readiness: heat-pump pricing for Florida homes, with Orlando and Tampa city data.

The Angi average problem

This deserves its own section because it is the trap. Angi's page, updated September 1, 2026 and based on 4,364 verified projects, says three different things: a headline average of $5,154, a "most homeowners pay $1,509–$8,799" band, and — in the whole-house-versus-partial section — "a whole-house generator costs an average of $17,000". It also says a standby generator "typically costs between $5,000 to $25,000" in another section, against a headline installation range of $350–$13,500. The $5,154 figure is the average across portables, partials and whole-house units together; the $17,000 is the whole-house-only average. Neither is wrong as arithmetic. But quoting $5,154 as the price of a whole-house generator understates the job by roughly two-thirds — which is why this guide leads with HomeGuide and Generac, and keeps Angi's figure only as the warning it is.

What it costs to run one

The purchase price is only the first cost. HomeGuide puts all-day running costs at $30–$170 a day: a 20 kW unit on natural gas costs $30–$40 a day, the same unit on propane $150–$170 a day, and a 20 kW diesel about $100–$120 a day. Angi's band is higher — $90–$220 a day for a 15–20 kW unit, and $220 a day for propane and $175 for diesel at 20 kW. At half load, manufacturer spec sheets put a 22 kW Generac at about $3.39 an hour on natural gas and $6.59 an hour on propane; a 14 kW Generac at $2.90 an hour on gas and $4.73 on propane. The fuel gap is the real running-cost story: natural gas costs roughly half what propane costs per hour, and a propane tank that seemed cheap at $400–$1,800 becomes the expensive fuel within the first multi-day outage. HomeGuide puts lifespan at 15–30 years or 10,000–30,000 hours, with up to 500 hours of continuous running — about three weeks.

Ways to keep the cost down

• Size to the essentials, not the whole panel — a 14–16 kW unit at $3,000–$4,500 covers most homes' critical loads for far less than a 22 kW unit.
• Use natural gas where it is available: no $400–$1,800 propane tank, and roughly half the hourly fuel cost of propane.
• Place the unit near the panel and the gas meter — the shortest gas and wire runs are the cheapest install, and long runs are what push jobs into HomeGuide's $9,500–$24,000 band.
• Get two to three quotes for the same kW and the same scope, and confirm in writing whether the transfer switch, pad, permits and gas line are included — the switch alone is about $1,200 of the install.
• Check whether your panel and gas meter can take the unit before you buy: a subpanel upgrade ($500–$2,000) or a gas-line upsize ($800–$3,000) found after purchase is a change order, not a quote.
• Do not pay for standby capacity you will not use — if outages in your area are rare and short, a portable unit at $500–$2,000 plus a manual transfer switch is the cheaper cover.

Frequently asked questions

Related cost guides

Sources: Angi, "Whole House Generator Cost [2026 Data]" (updated September 1, 2026; 4,364 verified projects: headline average $5,154, most $1,509–$8,799; portable $500–$2,000; partial 9–20 kW $2,000–$6,300; whole-house unit $5,000–$18,000; whole-house-only average $17,000; standby installation average $4,520; labour $1,500–$5,000; transfer switch about $1,200; pad about $1,000 at $50–$75/sq ft; permits $50–$200; running $90–$220/day for 15–20 kW); HomeGuide, "How Much Does a Whole House Generator Cost (2026)" (last updated December 30, 2025 — about 316 days old, flagged on-page: installed $6,000–$11,000; unit $3,000–$6,000; labour $3,000–$5,000, $5,000–$12,000+ for long runs or over 20 kW; total $9,500–$24,000 for long runs or over 20 kW; by-size unit table; fuel table; transfer switch $600–$2,500 installed; pad precast $150–$400; gas line $12–$25/ft; propane tank $400–$1,800; permits $80–$450; running $30–$170/day; lifespan 15–30 years / 10,000–30,000 hours); Generac published installed range $8,000–$16,000, generator about one-third of total; Generac 22 kW MSRP $6,119 unit / $6,979 with 200A switch and 26 kW $7,159 / $8,219 (October 2026 list prices, via MDL Electric and dealer listings); Forbes Home, "How Much Does A Generator Cost?" (average $9,000, range $4,000–$25,000+ including installation; by-size and by-fuel bands — live forbes.com page not directly verified in this pass, figures via syndicated mirror and secondary citations, used only as a cross-check); This Old House, "How To Install an Automatic Standby Generator" (updated June 2, 2026; $7,178–$13,959, gas hookup $15–$20/ft — states its cost data is sourced from Angi, so not an independent source); installer quote tracking (median installed 22 kW quote $11,200, most $9,000–$13,000, November 2026 — single source, attributed). NOT used: Reddit owner quotes of $14,000–$20,000 — no verifiable thread was found in targeted searches, so no owner-quote figure is published; Fixr — no generator-cost page found; Angi's $5,154 headline as a whole-house average — explained on-page as a blended figure; any tax-credit claim — standby generators were not broadly eligible for the residential clean energy credit, which ended for property placed in service after December 31, 2025. Full source list and methodology: How we research. Spotted a price that looks wrong in your area? Tell us — we re-check reader-flagged figures first.