How much does an 18kW standby generator cost installed?

Air-cooled standby installs in this class land at $9,000–$15,000 installed per the standby hub's cost ranges — unit, automatic transfer switch, electrical work, gas plumbing, site prep, and permits included. A model-specific turnkey band for this unit is not yet recorded in the dataset.

Is the Briggs & Stratton PowerProtect+ 18 kW Standby Generator enough to power a whole house?

Mid-tier residential standby generator, 18 kW class. Whole-house coverage depends on your load calculation; a licensed installer will size it against your panel and largest appliances.

Briggs & Stratton PowerProtect+ 18 kW Standby Generator cost & price guide

Updated September 2026

Standby generator installed beside a home

The Briggs & Stratton PowerProtect 18 kW runs about $5,200 for the unit — a reported band of $4,800–$5,600 for the 17–18 kW class, with ATS bundles adding roughly $400–$800 more. No turnkey installed band is recorded for this model in the dataset: installed cost depends on the transfer switch, electrical work, gas plumbing, and permits, and the honest statement is that the model-specific figure is not yet sourced rather than inventing a multiplier. It is the top of Briggs's air-cooled PowerProtect line, at the size where liquid-cooled systems start to make sense for all-electric homes.

What you should expect to pay

MSRP: Not published
Unit (est.): $5,200
Installed (est.): —
90-day low: —

Band reported $4,800-$5,600 for 17-18 kW class (midpoint 5,200).

Confidence: low · Data as of 2026-09-17

MSRP: Not published
Unit (est.): $5,200 (band $4,800–$5,600, 17–18 kW class)
Unit + ATS: roughly $400–$800 more
Installed (est.): Not recorded in the dataset — see the standby hub's installed-cost ranges
90-day low: —
Confidence: low · Data as of 2026-09-17

Cost to install

Installation is what turns the unit price into a working standby system: the automatic transfer switch (bundles add roughly $400–$800 for the ATS), the electrical work between switch and panel, the gas plumbing run, the concrete pad and site prep, and the municipal permit. The standby hub prices those adds — installation typically runs $4,000–$9,000 on top of the unit, and complex installs with panel upgrades or long gas runs can exceed $10,000. A model-specific turnkey band for this unit is not yet recorded in the dataset; dealers quote it per site.

Reported prices

Observation row briggs-powerprotect-18kw (typical_street 5,200; sources: Briggs & Stratton newsroom, Lowe's listings, Norwall).

Specs

Rated Output Kw: 18
Fuel Options: natural gas, liquid propane
Cooling: air-cooled

Where to buy

Electric Generators Direct — Specialist retailer, broad air- and liquid-cooled stock
Home Depot — Generac and other air-cooled models, often in stock
Lowe's — Generac and Briggs & Stratton, in-store pickup
Generac (manufacturer) — Find a certified dealer for installed quotes

Frequently asked questions

How much does an 18kW standby generator cost installed?: Air-cooled standby installs in this class land at $9,000–$15,000 installed per the standby hub's cost ranges — unit, automatic transfer switch, electrical work, gas plumbing, site prep, and permits included. A model-specific turnkey band for this unit is not yet recorded in the dataset.
How much is the Briggs PowerProtect 18kW unit itself?: About $5,200 — a reported band of $4,800–$5,600 for the 17–18 kW class, with ATS bundles adding roughly $400–$800 more (dealer/retailer listings, low-confidence aggregate).
How much does the Briggs & Stratton PowerProtect+ 18 kW Standby Generator cost installed?: Installed cost depends on site conditions — the transfer switch, electrical work, gas plumbing, and permits typically add 50–60% to the equipment price.
Is the Briggs & Stratton PowerProtect+ 18 kW Standby Generator enough to power a whole house?: Mid-tier residential standby generator, 18 kW class. Whole-house coverage depends on your load calculation; a licensed installer will size it against your panel and largest appliances.
What does the Briggs & Stratton PowerProtect+ 18 kW Standby Generator cost to run?: Running cost depends on fuel and load. On natural gas, expect roughly $20–$60 per day of continuous operation for an air-cooled unit, plus a few dollars a month for weekly self-tests and $200–$500 a year for maintenance.

Related guides

Whole-house standby generator cost — the standby hub: unit and installed cost at a glance, cost drivers, and model-by-model comparisons.
Roof replacement costs — installed cost per square for asphalt, metal, and tile roofs, plus tear-off and pitch.
Roof replacement cost calculator — estimate your own roof by size, material, tear-off layers, pitch, and stories.
Driveway & concrete flatwork costs — asphalt, concrete, and paver pricing per square foot; the same flatwork family as the poured pad your standby unit sits on.

Sources

Briggs & Stratton - New PowerProtect lineup (newsroom) (high reliability)
Lowe's - Briggs & Stratton home standby generators (medium reliability)
Norwall PowerSystems - Briggs & Stratton standby generators (medium reliability)

About this data

Prices are aggregated from public dealer and retailer listings and are indicative, not quotes. Manufacturers often do not publish MSRP for dealer-installed equipment.

[medium] conflicting: 2026-10-01 recheck: Briggs 18kW PowerProtect+ unit live at $6,017 (Norwall 40757) is +15.7% above the dataset midpoint $5,200 and +7.4% above the band top $5,600 - MATERIAL upward drift. Single live source this pass (Lowe's/Home Depot 403; Briggs newsroom price-free). The dataset's 17-18kW class band appears stale at the top for PowerProtect+ trims.