Generator Installation Cost Calculator
Estimate standby generator equipment and installation cost.
Last updated: November 5, 2026
Starting figures illustrate this model. Enter your own measurements, quoted costs and applicable terms; this page does not retrieve live prices or provider rates.
Estimated project cost
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- Low-range estimate: —
- High-range estimate: —
- Typical variable cost: —
- Total excluding base fixed charges: —
On this page
Quick summary: Estimate standby generator equipment and installation cost.
Read the method, example and limitations
Updated reference sections in this guide are in English.
Guide language: English. Updated October 15, 2026.
What this calculator estimates
Estimate standby generator equipment and installation cost.
Inputs and units
Enter Generator capacity (kW), Low cost per kW installed ($), Typical cost per kW installed ($), High cost per kW installed ($), Transfer switch, gas and permits ($), Contingency (%). Use the units shown. Required fields cannot be blank. Use zero only where that field and the model allow it. Select Calculate after changing the values.
Method and assumptions
For Generator Installation Cost Calculator, use 'Generator capacity (kW)' as quantity q and 'Transfer switch, gas and permits ($)' as the fixed charge F. For each low, typical or high unit cost U, total = (q x U + F) x (1 + contingency/100). Low must not exceed typical, and typical must not exceed high. The final breakdown labelled total excluding fixed charges includes any contingency attached to those charges.
Worked example
These are hypothetical example inputs, not a statement of local market prices.
| Generator capacity (kW) | 20 |
|---|---|
| Low cost per kW installed ($) | 500 |
| Typical cost per kW installed ($) | 900 |
| High cost per kW installed ($) | 1400 |
| Transfer switch, gas and permits ($) | 1500 |
| Contingency (%) | 10 |
| Low scenario | $12,650.00 |
|---|---|
| Typical scenario | $21,450.00 |
| High scenario | $32,450.00 |
| Typical variable cost | $18,000.00 |
| Total excluding base fixed charges | $19,950.00 |
Limitations
Prefilled prices for generator installation cost are illustrative budgeting assumptions. Replace them with local written quotes and avoid including 'Transfer switch, gas and permits ($)' both in a unit quote and again as a fixed charge. A linear unit-cost model does not capture every scope, access, size, materials or regulatory requirement.
Match the quantity to the quoted scope
Count installed systems and identify the rated capacity in the quote. Equipment-only prices may exclude the transfer switch, fuel connection, pad and electrical work; the calculator does not size a generator.
For each low, typical or high unit rate, the calculation is (quantity × rate + fixed work) × (1 + contingency/100). The typical result uses the entered typical rate; it is not the midpoint unless you enter a midpoint rate. These three rates are your scenarios, not a market-price database. All three receive the same fixed work and percentage allowance.