If you’re thinking about a whole-home generator, one of the first questions is what it will cost to install. The honest answer is that it depends on your home. Two houses on the same street can have very different installation costs because of the generator size, the fuel connection and the electrical work involved. Here are the factors that change the price, so you know what to expect from a quote.
1. Generator Size
The biggest single factor is how much power you want to back up. A generator sized for essential circuits such as the refrigerator, some lights, the furnace blower and internet costs less than one sized to run central air, the range, the water heater and the rest of the house. Our guide to what size generator you need explains how sizing works.
2. Transfer Switch and Electrical Panel Work
Every standby generator needs an automatic transfer switch that moves your home’s circuits to generator power during an outage. Whole-home transfer switches cost more than switches that cover only selected circuits. Older or full electrical panels may also need upgrades or load management devices before a generator can be connected safely.
3. Fuel Type and Gas Line Connection
Most standby generators run on natural gas or propane. If your home already has natural gas service close to where the generator will sit, the connection is simpler. Longer gas line runs, a larger gas meter or a new propane tank add to the cost.
4. Location and Site Preparation
Generators need a level pad and specific clearances from windows, doors, vents and property lines. The distance between the generator, your electrical panel and your gas meter affects how much wire and gas line is needed. Sloped yards, tight side yards or obstacles can add site preparation work.
5. Permits and Inspections
Generator installations usually require permits and inspections for the electrical and fuel connections. Permit requirements and fees vary by city and county, so they’re part of an accurate quote.
6. Add-Ons That Protect Your Investment
- Maintenance plans keep the generator ready to run. See our generator maintenance and repair service.
- Whole-home surge protection helps protect electronics and appliances when power switches over.
- Remote monitoring, available on many models, lets you check generator status from your phone.
How to Get an Accurate Generator Quote
Online price ranges can’t account for your panel, fuel line, yard and the circuits you want backed up. An in-home assessment can. One Source Heating, Cooling, Plumbing & Electrical evaluates your home, recommends the right size and gives you a clear quote for whole-home generator installation in Birmingham, Hoover, Homewood, Vestavia Hills, Mountain Brook and surrounding communities. Start with our quick generator quiz, or compare options in our guide to whole-house vs. portable generators.