The cost to install a backup generator depends on the generator’s size, type, and the complexity of the electrical work required to connect it to your home. A backup generator provides peace of mind during power outages — keeping essential systems running, from HVAC and refrigerators to medical equipment and sump pumps. This guide covers typical costs, what affects pricing, and what to expect from the installation process.
Contents
⚡ Key Takeaways
- There are two main types of home backup generators: portable and standby.
- A full standby generator installation includes several components beyond the generator unit itself:
- Generator Size and Output Larger generators cost more upfront and require more robust electrical connections.
Types of Backup Generators and Their Costs
There are two main types of home backup generators: portable and standby. Each differs significantly in cost, installation requirements, and how much of your home it can power.
- Portable generators: $500 – $3,000 for the unit; minimal installation cost if used with a manual transfer switch
- Standby generators (7–12 kW, whole-home small): $3,000 – $6,000 for the unit plus $1,500 – $3,000 installation
- Standby generators (14–22 kW, mid-size): $4,000 – $8,000 for the unit plus $2,000 – $4,000 installation
- Standby generators (22+ kW, large home): $6,000 – $15,000+ for the unit plus $3,000 – $5,000 installation
Most homeowners installing a whole-home standby generator spend between $7,000 and $15,000 all-in, including the unit, transfer switch, wiring, gas line, and permits.
What’s Included in Generator Installation
A full standby generator installation includes several components beyond the generator unit itself:
- Automatic transfer switch (ATS): $500 – $1,500 for the component; included in most standby installations
- Electrical panel connections: Wiring the ATS to your main panel costs $500 – $1,500 in labor
- Gas line connection: Natural gas or propane line installation adds $200 – $800
- Concrete pad: Most standby generators require a concrete base, costing $100 – $500
- Permits and inspections: $100 – $400 depending on your municipality
Cost Factors That Affect Installation Price
Generator Size and Output
Larger generators cost more upfront and require more robust electrical connections. Sizing depends on the circuits you want to back up — running essential circuits only is cheaper than powering the entire home.
Fuel Type
Natural gas generators cost less to operate and connect to existing gas lines. Propane requires a separate tank installation, adding $500 – $2,000. Diesel generators are powerful but require fuel storage and more maintenance.
Distance from Panel and Gas Line
The further the generator is placed from the electrical panel and gas connection, the more wiring and piping is required — increasing labor and material costs significantly.
Generator installation costs depend on your home’s size and existing panel capacity. Our team provides upfront quotes — contact us for a free estimate.
When to Hire a Licensed Electrician
Generator installation always requires a licensed electrician. This is not a DIY project — improper installation can cause backfeed into utility lines, creating a fatal risk for line workers and your own household. A licensed electrician will:
- Size the generator correctly for your electrical load
- Install and wire the transfer switch properly
- Pull required permits and schedule inspections
- Ensure code compliance per National Electrical Code (NEC) Article 702 for your municipality
Annual Maintenance Costs
Standby generators require annual servicing to remain reliable. Typical maintenance costs $150 – $300 per year and includes oil and filter changes, battery checks, and load testing. Many manufacturers require documented annual service to maintain the warranty.
Frequently Asked Questions
What size generator do I need for my home?
A 7–10 kW generator covers essential circuits (lights, fridge, HVAC, well pump). A 14–22 kW unit can power most or all of a mid-size home. An electrician can perform a load calculation to recommend the right size.
How long does generator installation take?
A full standby generator installation typically takes 1–2 days for the electrical work, plus additional time for the gas line connection if needed. Permit processing can add days to weeks depending on the municipality.
Does a backup generator add value to my home?
Yes. A standby generator is considered a desirable home feature and can increase resale value, particularly in areas prone to frequent or extended power outages.
Can I connect a portable generator to my home’s electrical system?
Yes, but only through a proper transfer switch. Never backfeed a generator directly into an outlet — this creates a deadly backfeed hazard for utility workers and can damage your appliances.