How much does a standby generator cost in 2026?

14-16 kW standby on natural gas with ATS installed: $7,500-$13,000. 20-22 kW: $9,500-$16,000. Liquid-cooled 35 kW for larger homes: $18,000-$35,000+. Propane installs add $800-$2,500 for the tank if you don't have one. Portable + manual interlock: $1,200-$3,500 — much cheaper but you start it yourself.

Standby = whole-house, runs automatically within 10-20 seconds of outage, fueled by NG / LP, $7,500-$16,000 installed, requires permit + ATS. Portable + interlock = you wire 6-10 essential circuits to a manual transfer switch, fire up the gasoline / dual-fuel portable when needed, $1,200-$3,500 installed.

7-10 kW: essentials only (fridge, sump, well pump, lights). 14-16 kW: typical home with central AC + electric appliances. 20-22 kW: larger home + 5-ton AC. 35-50 kW liquid-cooled: estate-sized homes. The standard rule is to size to your largest motor load (usually AC) plus 20-30% headroom.

Whole-House Generator Cost (2026) | Standby, Portable, Liquid-Cooled

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Pro installed Portable + interlock

Includes labor, equipment, permit, and contractor markup.

Common projects

Generator & transfer

Generator size

Transfer switch

Fuel

Gas line run (lf)

Wire run ATS to panel (lf)

Concrete / composite pad

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ZIP / planning zone (optional)

Uses the first 3 digits as a planning zone (not exact local pricing). Overrides state average when matched.

Add-ons

Propane tank (LP only)

Cold-weather kit

Annual maintenance (year 1)

Permit

Your generator estimate

Estimated installed range

Calculating…

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Materials

Labor

Per generator

Cost breakdown

Item	Quantity	Estimated range

Planning estimate, not a bid. 2026 ranges informed by Generac / Kohler / Cummins / Briggs & Stratton MSRP, HomeGuide, HomeAdvisor, Homewyse, and BLS regional wage data.

What's not included: propane tank rental contracts (separate from purchase), service entrance / utility upgrade, smart-home integration, fuel storage beyond tank, ongoing fuel cost, demolition of an old generator.

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Methodology & sources

What this is: a planning-range generator calculator informed by Generac / Kohler / Cummins / Briggs & Stratton manufacturer pricing, HomeGuide, HomeAdvisor, Homewyse, and licensed cost-estimating references.

Labor is modeled from per-unit installed rates with a crew-rate sanity check ($80-$150/crew-hr loaded billing rate), informed by BLS OEWS 47-2111 (Electricians) and 47-2152 (Plumbers / Pipefitters).

Last updated: May 2026. Full methodology →

How much does a generator cost in 2026?

Scope	Range	Timeline
Portable + manual interlock	$1,200-$3,500	4-6 hours
8-10 kW standby (essentials)	$5,500-$9,000	1 day
14-16 kW standby NG	$7,500-$13,000	1-2 days
20-22 kW standby NG	$9,500-$16,000	1-2 days
22 kW standby LP + tank	$11,000-$18,500	2-3 days
30-50 kW liquid-cooled (estate)	$18,000-$35,000+	3-5 days

Frequently asked questions

How much does a generator cost?

$1.2k-$35k+ depending on size and scope. Portable + interlock $1.2-$3.5k. 14-16 kW standby $7.5-$13k. 20-22 kW $9.5-$16k. Liquid-cooled $18-$35k.

Standby vs portable?

Standby = automatic, whole-house, NG/LP, $7.5-$16k. Portable + interlock = manual, essentials only, gasoline, $1.2-$3.5k.

What size?

7-10 kW essentials. 14-16 kW typical home + AC. 20-22 kW larger / 5-ton AC. 35-50 kW estate. Size to largest motor + 20-30%.

Natural gas vs propane?

NG = unlimited fuel from utility, no storage. LP = independent of utility, but requires 250-500 gal tank ($800-$2,500). NG preferred where available.

Maintenance?

Annual oil change + filter + battery test ($200-$500/yr). Run weekly self-test. Replace battery every 3-5 yr. Manufacturer 5-yr warranty typical.

Common mistakes & questions

Undersized gas line — 14kW+ NG units need 1-1/4" line; existing 1/2" or 3/4" won't deliver enough BTU.
Wrong ATS amperage — match to main panel (200A common). Mismatch trips during transfer.
Generator placement too close to windows — manufacturer + code minimum is 5 ft from openings.
Skip cold-weather kit in cold zones — won't start below ~32°F without it.
No annual maintenance — battery / oil failures = won't start when you need it.
Propane tank under-sized — 14kW unit burns 2 gph at full load; 250-gal tank = 100 hours runtime.
Ask your contractor: manufacturer warranty, gas-line size, ATS amp rating, exercise schedule, exhaust placement, neighbor noise compliance, NEC / NFPA permit + inspection.

When this estimate is wrong

No NG service — adding LP tank or NG line is a separate utility scope ($1.5-$5k).
Service entrance upgrade required for ATS — separate utility scope.
Mounted on roof or upper deck — crane fee adds $500-$2,000.
HOA noise / setback restrictions — sound-attenuated enclosures cost more.
Hurricane code mounting (FL coastal) — anchor straps + slab anchors add ~$500.
State / utility rebates — some utilities offer interconnect rebates; verify before purchase.