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How Much Does It Cost To Repair A Generator?

Typical Range: $161 - $367

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Generator Repair Costs

The average cost to repair a generator is $263. Maintenance of portable or smaller (7-10 kW) models will typically be less expensive, costing around $50. On the other hand, larger (30-45 kW) models cost as much as $600 to repair. The price generally varies between $161 and $367 and will depend on whether you have a portable or standby generator.

A generator can be a life saver when you are faced with no power during a storm or natural disaster. Your generator can power anything from a refrigerator or heater to your entire home. So, keeping your generator working properly could be the difference between having what you need during a power outage, or not.

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National Average $263
Typical Range $161 - $367
Low End - High End $85 - $645

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Cost data is based on actual project costs as reported by 1,195 HomeAdvisor members in .

Generator Repairs by Type

the average cost to repair a generator is $260 or $85 to $600

Generator repairs typically cost between $85 and $600, depending on the size of the equipment.

Portable Generator Repairs

Repairing a portable generator usually costs around $50. Less powerful than other generators, portable units are suitable for powering a couple of appliances in your home for a few hours. They require a lot of fuel, and you must keep them full to keep them working. Repairs for these units cost less than fixing permanent standby generators because they are less complex and take less time to diagnose and fix. You can troubleshoot many common issues yourself:

  • Overload: These styles can only provide a certain amount of energy. Many homeowners overload them and compromise the system. If a generator isn't working, try disconnecting an appliance or two.
  • Fuel and Oil Problems: You have to monitor these units and fill their oil and fuel frequently. A system that isn't starting or that shuts down during operation could be low on either. It could also be that the fuel has degraded from disuse.
  • Overheating / Lack of Air: It needs proper ventilation to continue operation. A clogged filter could cause the system to stop mid-operation or refuse to start.
  • Loose or Bad Spark Plugs: If you're having difficulty getting it started, you may need to tighten or replace the spark plugs.

Once you've checked the basics like overload and fuel level, get in touch with a local portable generator repair professional to ensure that the equipment gets reliable repairs before the next power outage.

Standby: Large & Small Engine Generators

It typically costs around $600 to repair a standby generator. These units are permanent fixtures and are usually connected to a natural gas or propane line. Some are only powerful enough to power a few appliances, while others can power your entire home if necessary. You may encounter many of the same issues you'd encounter with a portable unit, but there are also some issues unique to this type:

  • Overfilled Tank:This is one of the most common mistakes homeowners make, according to service professionals.
  • Battery Failure: Sulfate builds up on the battery plates, minimizing the current that comes through. You will have to replace a battery with too much of this buildup. Expert recommend doing so once every three years. Connections can also loosen or collect buildup, causing battery failure.
  • Carburetor Clog: Failure to start and poor operating performance are signs that the carburetor is clogged. This is an expensive fix because it requires that a professional disassemble the engine.
  • Spark Plugs: As with portable units, bad spark plugs are a common problem with standby equipment.
  • Leaks: This equipment can leak coolant, fuel and oil. Fuel will leak when it isn't being used to its full load capacity. Coolant will leak from the block heater hoses if the hose material cannot handle the temperature.
  • Breaker /Switch Issues: Human error is a common culprit in generator operation. If the control switch is left in the off position or the breaker is left open, the equipment won't work. The breaker can also trip in a storm or outage.
  • Gauge Malfunction: The fuel gauge can get stuck during disuse and give inaccurate readings.
  • Air Pockets: Air can get into the tank during disuse. Injectors often fail to fire if there are bubbles in the system.
  • Coolant Problems: It is common for these generators to have issues with coolant levels and temperatures. Low levels could indicate a leak, while low temperatures could signal faulty block heaters.

Repair Cost Factors

Fuel Type: Gas, Natural Gas, Diesel & Propane

Each fuel type comes with its own repair and maintenance schedule:

  • Propane: These generators cost more to fix and maintain, but demand for these services will be infrequent. These units don't have a lot of issues because there aren't many components involved in their operation. Propane's longer shelf life also means that the fuel won't need to be managed or removed during disuse.
  • Natural Gas: Will require more involved and costly installation. But once connected, maintenance should be the homeowner's only concern. Repairs are infrequent.
  • Gas and Diesel: Require more upkeep and repairs. These fuels have short shelf lives and can clog or degrade during disuse. Spills and overfilling are common problems.


Generators come in different sizes, denoted by kilowatts. Small models typically deliver 7-10 kW; mid-size models are 12-20 kW; and larger ones deliver 22-45 kW. The larger models are much more complicated, and the cost of fixes will definitely be higher. The small and less powerful the generator, the less the cost of repairs will be.


The problem that you're having with your generator will ultimately determine the cost to repair it. If it's an issue with your electrical meter or power panel, then you'll need to hire a licensed electrician and the cost will increase. If it's a problem with your fuel tank, then you might need to contact your local utility company to check the connection to your fuel line.

Consult with a Pro to Diagnose Your Generator Issue

Generator Maintenance & Tune-Up Prices

Even when your generator doesn't break down, it requires periodic maintenance. If you live in a cold climate, annual tune-ups should be part of your winter storm preparedness strategy.

Your unit will only run periodically, which preserves energy but also makes regular maintenance more important. Part of your consideration should always be your generator power consumption and safety.

When you hire a service contractor for generator maintenance, expect service on the following systems:

  • lubrication
  • cooling
  • fuel
  • air and combustion
  • battery/starting mechanism
  • transfer switch
  • alternator
  • engine filter

Generator Service Costs by Type

The size and type of generator in your home can change the extent and cost of maintenance. The table below is based on average run time; if your generator runs longer than average, it might require more frequent maintenance.

How Often to Service Your Generator
StandbySami-Annual$200 - $300
PortableAnnual$80 - $150
Diesel, Gas, Natural Gas & PropaneAnnual$100 - $300

Larger, commercial generators typically run more frequently than units designed for smaller homes. As a result, they will need more frequent and more thorough inspections and maintenance. Industrial products should be serviced monthly, with a thorough check of all components. Regardless of unit size, hiring a pro is crucial to make sure everything checks out during the inspection.

Generator Warranties

Most models come with warranties that include service if something goes wrong. These warranties do not cover the regular maintenance and tune up required. While warranties differ by individual product, here's what you can expect from the major generator brands:

Length of Generator Warranties
BrandDefault Length (in years)
Briggs & Stratton5

Annual Service Contracts

Unlike warranties, these agreements cover the maintenance your generator needs to reliably work. Annual service contracts typically cost between $150 and $300 per year, and are commonly offered through the generator manufacturer.

However, some installation professionals might also offer their own, less-standardized version of an annual maintenance contract. Talk to your installation and repair professionals for more details because these agreements vary in service and price.

Hire a Generator Professional to Repair your unit

How Much Does Generac Generator Maintenance Cost?

Like other brands, Generac generators require annual maintenance. Generac offers a $200 annual service contract that takes care of the yearly checks, but some professionals offer less expensive options at $80 to $150 per checkup. If your generator is still under warranty, work only with the manufacturer or approved contractors to prevent voiding its coverage.


Because of the difficulty of rewinding a generator motor, leave it to an experienced professional. Most pros will charge between $300 and $700.

Electric motors periodically need rewinding to ensure reliable and efficient operation. The process includes removing the old coil, winding a new coil onto the motor, and varnishing the coil to make it permanent.

Fixing or Replacing Home Generator Parts

In most cases, your generator stops working because of a specific part. Diagnosing and repairing that part is more beneficial and cost-effective than a complete generator installation cost.

Stator & Rotor

A new stator and rotor set typically costs between $250 and $1,500. They are stationary and rotating parts of any system that generates electricity. When they stop working seamlessly, they need repair or replacement.


The carburetor mixes air and fuel to create the right combustion ratio. Small problems, such as a loose gasket, can be easily repaired for less than $50. Complete carburetor replacement will cost between $60 and $300.


The engine is the most important component of the unit. Repairing small parts of your generator's engine can cost as little as $50, but more comprehensive jobs can be more than $2,000.

Voltage Regulator

Especially when connecting major appliances to your generator, the voltage generator is crucial. A new part costs between $40 and $80, plus the required cost to hire an electrician.

Transfer Switch

Repairing an existing transfer switch will typically cost between $50 and $150, depending on the exact problem. If the problem is significant, consider complete replacement, which will be between $200 and $400 plus three to four hours of electrical labor. Explore more costs of installing a new generator transfer switch.

Who Fixes Generators? - DIY vs. Pro Repair Shops

Repairing your home generator almost always requires a professional. This advanced electrical equipment will require expertise to diagnose the problem, and repair or replace the right parts. DIY generator repair kits do exist but should only be used by the average homeowner to take care of small issues and routine maintenance.

Read reviews and get quotes from experienced generator repair service in your area.

Hire a Generator Repair Electrician
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