Generator installation is a multi-trade project — electrical, gas, concrete, and permits all in one job. Generator estimate software coordinates every component into a single professional proposal with clear scope and pricing.
What generator contractors need in estimate software
- Generator unit — brand, kW size (7.5 kW to 22 kW residential), fuel type (NG/LP)
- Transfer switch — manual vs. automatic transfer switch (ATS), amperage
- Electrical work — service entry, sub-panel connection, wire run from panel to generator
- Gas or propane line — line sizing, run length, pressure test
- Concrete pad — pad poured or pre-cast, dimensions
- Permit and inspection — electrical + gas permits typically required
Generator installation pricing quick reference (2026)
- 7.5 kW air-cooled (whole-home small) — $4,500–$7,500 installed
- 13 kW air-cooled — $6,000–$10,000 installed
- 20 kW air-cooled — $8,000–$14,000 installed
- 22 kW Generac / Kohler — $9,000–$16,000 installed
- Automatic transfer switch (ATS) — $1,000–$2,500 installed
- Concrete pad (4×6 to 4×8) — $300–$700
- Gas line extension (per lin ft) — $15–$30
How to estimate a generator installation
- Perform a load analysis — size generator to critical loads (or whole-home)
- Select fuel type: natural gas (connected to utility) or LP (requires tank sizing)
- Measure electrical run from main panel to generator pad location
- Measure gas line run from meter or main valve to generator
- Add permit fees for electrical ($200–$500) and gas ($100–$300)
Generator estimating mistakes
- Not checking gas line size and pressure — undersized line fails at startup
- Forgetting utility notification requirement for large systems
- Overlooking HOA restrictions on generator placement and sound levels
The ConstruMate generator calculator bundles unit, transfer switch, electrical, gas, and concrete costs into a professional proposal you send the same day as the site visit.
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