Whole-House Generator Installation Cost Calculator
Estimate the cost to install a whole-house standby generator based on generator size (kW), fuel type, and options like new gas lines and load centers.
A whole-house generator installation costs $7,000 to $20,000, with a national average of $12,000. Use the calculator below to estimate your cost by size, quality tier, and location.
Last updated: March 25, 2026
Whole-House Generator Installation Cost Calculator
Estimate the cost to install a whole-house standby generator based on generator size (kW), fuel type, and options like new gas lines and load centers.
Estimated Total
$16,500
Itemized Breakdown
This calculator provides estimates based on national averages adjusted for your region. Actual costs may vary significantly based on specific project conditions, contractor availability, material prices, and local market factors. Always get at least 3 quotes from licensed, insured contractors before starting your project.
Want the full picture?
Read our complete Whole-House Generator Installation cost guide with material comparisons, contractor tips, savings strategies, and regional pricing data.
Quick Cost Reference
Cost by Tier
10-14 kW air-cooled standby generator, 100-amp transfer switch, existing gas line
20 kW air-cooled, 200-amp automatic transfer switch, new gas line run
22+ kW liquid-cooled, whole-house coverage, extended gas line, load management
How This Calculator Works
This whole-house generator installation cost calculator estimates your total project cost from four inputs: project size, quality tier, the options you select, and your location. It combines material and labor rates for your chosen tier, adds typical permit costs, then applies a regional cost multiplier so the estimate reflects pricing in your state.
Estimates use 2026 cost data cross-referenced from multiple industry sources. Treat the result as a planning range, not a quote. Your final price depends on your specific scope, material choices, and local contractor availability, so collect at least three itemized bids before you set a budget.
What Affects Your Whole-House Generator Installation Cost
Generator Size (kW) and Coverage
$2,000 - $15,000Sizing a generator starts with what you want to power. Essential loads (refrigerator, sump pump, lights, outlets) need 10-14 kW. Powering the HVAC adds 5-8 kW. Whole-house coverage including electric range and EV charger may require 22-40 kW. Each additional kW of capacity adds $200-$500 in equipment cost. Oversizing is common and expensive - do a load calculation first.
Fuel Type: Natural Gas vs. Propane vs. Diesel
$500 - $3,000Natural gas generators connect to your existing utility line - no storage needed, the fuel supply is automatic. Propane requires a 500-1,000 gallon tank ($1,000-$2,500 installed) but works where natural gas is unavailable. Diesel is more fuel-efficient but requires on-site storage and regular fuel maintenance. Natural gas is the most convenient for standby use.
Transfer Switch Type and Amperage
$500 - $3,000A manual transfer switch ($300-$500) requires you to manually switch to generator power. An automatic transfer switch (ATS) detects an outage and switches within seconds - the standard for whole-house generators. A 100-amp ATS costs $500-$900; a 200-amp ATS costs $800-$1,500. Whole-home coverage requires a 200-amp switch matched to your panel size.
Gas Line Installation
$300 - $3,000If your existing gas line reaches the generator location (within 20-30 feet), connection is straightforward ($300-$600). Longer runs through finished areas or underground add significant cost - $15-$30 per linear foot for underground installation. Homes with propane must budget for a new or enlarged tank. Gas pressure may need a regulator upgrade for larger generators.
Concrete Pad and Permanent Installation
$300 - $1,500Standby generators require a permanent concrete pad (minimum 2-3 inches thick) sized to the unit. A standard 10-14 kW pad costs $300-$600 installed. Larger units need bigger pads ($500-$1,000). The generator must be placed at least 5 feet from windows, doors, and gas meters - constraints that can add gas line length. Some HOAs require screening.
Frequently Asked Questions
How much does a whole-house generator installation cost?
A whole-house generator installation costs $7,000 to $20,000 for a typical project, with a national average of $12,000. Budget projects start around $3,500, and premium work can reach $35,000. Use the calculator above for an estimate matched to your size, quality tier, and state.
How does this whole-house generator installation cost calculator work?
It combines 2026 material and labor rates for your selected quality tier, adds typical permit costs and any options you choose, then applies a cost multiplier for your state. Adjust the inputs to see your estimate update instantly.
Is this calculator free to use?
Yes. This whole-house generator installation cost calculator is free, requires no signup, and returns instant estimates.
Does the estimate include labor and permits?
Yes. Each estimate combines material and labor costs for your chosen quality tier plus typical permit fees. Your final price still depends on your specific scope and local contractor rates, so collect itemized quotes before budgeting.
How can I lower my whole-house generator installation cost?
Size to essential loads only - an 11-14 kW generator protecting your critical circuits (refrigerator, sump pump, heat, lights, and outlets) costs $4,000-$7,000 less than a whole-house unit and handles 90% of outages perfectly well. Get quotes in fall or spring, not during or immediately after a storm season - post-hurricane demand spikes prices 20-40% and extends lead times for months.
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