Naperville IL Generator Installation
OneStop Pro installs whole-home standby generators in Naperville from our Wheaton shop at 805 W Liberty Dr — Generac-capable sizing, permits, gas and electrical, and automatic transfer switches with upfront pricing. Call 630-733-9000 or see generator services and Naperville service area.
Naperville storms take out trees along Washington and Ogden, and ComEd outages leave large multi-bath homes without HVAC, sump, and refrigeration. A permanently installed standby system — not a portable unit — is what keeps White Eagle, Tall Grass, and Riverwalk-area homes running. Family-owned since 2007. BBB A+. 4.9/5 from 1,000+ reviews.
Call 630-733-9000 or schedule online for a complimentary load assessment.
4.9/5.0 from 1,000+ reviews · Family-owned since 2007 · Licensed, bonded, and insured · Generac-capable installs · A+ BBB
What Naperville generator installation includes
This page covers standby generator installation and sizing for Naperville homes. Full service menu: generator services. For other trades, use the Naperville service area hub.
- Whole-home load assessment and kW sizing
- Generac and other leading standby brands we are equipped to install
- Concrete pad, set, and leveling
- Natural gas or propane fuel connection
- Automatic transfer switch and electrical tie-in
- City of Naperville permits and inspection coordination
- Startup, load test, and owner walkthrough
- Annual maintenance options after install
Why Naperville homes size generators differently
Downtown and older Riverwalk-adjacent homes often need enough capacity for a furnace, sump, fridge, and a modest circuit set — but panels may be older and need a service check before the transfer switch goes in. South Naperville builds in Tall Grass, White Eagle, Ashbury, and Saybrook frequently run 200-amp services with two HVAC systems, finished basements, and well pumps or electric ranges that push a 22–24 kW class unit instead of a smaller essential-only generator.
We do not guess kW from a square-footage chart. We walk the panel, list the loads you care about during an outage, and size the machine to that list — including whether you want whole-home coverage or a prioritized essential load.
Permits with the City of Naperville
Standby generator installs in Naperville typically need building, electrical, and often gas-related approvals through City of Naperville Building Services. Setbacks from property lines, windows, and air intakes matter; so does pad location relative to floodplain pockets near the DuPage River. We pull the permits, schedule inspections, and do not leave you to chase the inspector.
Electrical work is performed under our licensed electrical authority, including Chicago Supervising Electrician ECC-94505 where that credential applies to the scope. Plumbing/gas entity and plumber licenses cover fuel-side work when required: 055-044076 / 058-197647.
Install process from assessment to startup
- Complimentary load assessment at your Naperville address.
- Written scope: unit size, pad location, fuel path, transfer switch, and price before work starts.
- Permits with the City of Naperville.
- Pad, set, gas, electrical, and transfer-switch install (typical residential install is about 1–2 days of on-site work after permits clear).
- Inspection, startup, and load test. We register warranty paperwork when the brand requires it.
Our shop: 805 W Liberty Dr, Wheaton, IL 60187. We’re the same family-owned company that already handles plumbing and electrical calls in Naperville.
Neighborhoods we install in Naperville
- Downtown Naperville and Riverwalk corridor
- Cress Creek and north Naperville (60563)
- Ashbury, Saybrook, Tall Grass
- White Eagle and south Naperville (60565)
- ZIP codes 60540, 60563, 60565
Naperville generator installation FAQs
How much does a Naperville standby generator cost?
Installed residential systems commonly land in a broad $8,000–$15,000 range for a typical 20–24 kW package (unit, transfer switch, pad, gas, electrical, permits). Large two-HVAC homes can run higher. You get a site-specific quote after the load assessment — not a phone guess.
Do you install Generac generators in Naperville?
Yes. We are Generac-capable and also work with other leading standby brands when the home and fuel setup call for it. Ask which unit fits your load and setbacks.
Will the City of Naperville require a permit?
Yes for almost all permanent standby installs. We handle Building Services paperwork and inspections as part of the job.
How long does installation take?
On-site work is typically 1–2 days once permits and materials are ready. Permit lead time varies with the city schedule.
What size generator do I need for a Naperville home?
It depends on HVAC count, electric appliances, and whether you want whole-home or essential-only coverage. We size from a load assessment, not a square-footage rule of thumb.
Do you maintain the generator after install?
Yes. Annual maintenance (oil, filters, battery, load test) keeps the unit ready for the next outage. Ask about plans when you book.
Can you handle the gas line and the electrical on one crew?
Yes. Plumbing/heating/electrical live under one company — that is the point of OneStop Pro for standby installs.
Book Naperville generator installation
OneStop Pro
805 W Liberty Dr, Wheaton, IL 60187
630-733-9000 · Schedule service
Complimentary load assessment. Upfront pricing. Family-owned since 2007.