Electrical
Generator Installation: Cost, Permits & Timeline
Installing a permanently mounted standby generator with an automatic transfer switch, concrete or composite pad, and a natural gas or propane fuel supply.
Model reviewed August 2026
Typical cost
$12,400
$6,500 – $22,000
per standby generator installed
$6,500 – $22,000
Permit
Required
$150 – $600
Timeline
2-3 days of work
2-3 days of work, 3-8 weeks including permitting and gas service
Do you need a permit for generator installation?
Yes
Generator Installation is permitted and inspected work in essentially every jurisdiction. Typical fees run $150 to $600. A licensed contractor generally has to pull the permit.
What drives the cost
- Generator size in kW (whole-home versus essential circuits)
- Automatic transfer switch type and amperage
- Fuel: natural gas tap versus buried propane tank
- Distance from the panel and trenching
- Pad, anchoring and wind-load requirements
Permit, inspections and documents
| Permit status | required |
|---|---|
| Typical permit fee | $150 – $600 |
| Licensed contractor required | Usually yes |
| Owner-builder allowed | Rarely |
| Inspections | Slab / pad inspection, Electrical rough, Gas line pressure test, Final inspection |
| Timeline | 2-3 days of work, 3-8 weeks including permitting and gas service |
| DIY difficulty | 5/5 difficulty |
Documents typically required
- • Building, electrical and gas permit applications
- • Site plan showing generator location and setbacks
- • Equipment specification and transfer switch details
- • Wind-load anchoring detail for the pad
Generator Installation cost by city
Local labor and material pricing applied to the national baseline.
| City | Typical range | vs national |
|---|---|---|
| New York | $11,400 – $38,600 | +75% |
| Los Angeles | $9,400 – $32,000 | +45% |
| Miami | $8,500 – $28,800 | +31% |
| Chicago | $8,400 – $28,600 | +30% |
| Phoenix | $6,800 – $22,900 | +4% |
| Dallas | $6,600 – $22,300 | +1% |
| Houston | $6,600 – $22,400 | +2% |
| Tampa | $7,100 – $24,000 | +9% |
| Denver | $7,600 – $25,700 | +17% |
| Orlando | $6,800 – $23,000 | +4% |
| Atlanta | $6,600 – $22,500 | +2% |
| Fort Lauderdale | $8,200 – $27,600 | +25% |
Generator Installation across the country
National pricing, state-by-state pricing, and the tools behind both.
Frequently asked questions
Do I need a permit for generator installation?
In most jurisdictions this work is permitted and inspected. Requirements are set locally, so confirm the current application and inspection checklist with your building department before work starts.
How long does generator installation take?
2-3 days of work, 3-8 weeks including permitting and gas service. Permit review and inspection scheduling are usually the largest source of variation.
What changes the price the most?
The largest cost drivers are generator size in kw (whole-home versus essential circuits); automatic transfer switch type and amperage; fuel: natural gas tap versus buried propane tank.
Sources
Sources & verification
Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.