How Much Does It Cost To Install A Whole House Generator?

If you’re considering installing a whole house generator, you might be wondering about the cost involved. Well, look no further because in this article, we’ll be uncovering just that! From the upfront expenses to the long-term savings, we’ll break down the various factors that impact the installation expenses of a whole house generator. So whether you’re curious about the price tag or interested in exploring potential benefits, read on to discover everything you need to know about installing a whole house generator and its associated costs.

Factors That Affect the Cost

Installing a whole house generator can be a significant investment, and there are several factors that can influence the cost. Understanding these factors can help you make an informed decision and budget accordingly.

Generator Capacity

The capacity of the generator, measured in kilowatts (kW), is one of the primary factors that determine the cost of the installation. The larger the capacity, the higher the cost. The generator capacity needed for your home depends on various factors like the size of your home, the number of appliances you want to power, and any specific requirements you may have.

Type of Generator

There are two main types of generators to consider – portable generators and standby generators. Portable generators are smaller, less expensive, and can be moved around as needed. Standby generators, on the other hand, are permanently installed and automatically switch on when there is a power outage. Standby generators are more expensive due to their features and convenience.

Fuel Type

The fuel type the generator uses also impacts the cost. The three main fuel options for whole house generators are natural gas, liquid propane, and diesel. Each fuel type has different costs associated with it, and it’s essential to consider both the upfront costs and the long-term fuel expenses.

Permit and Installation Costs

When installing a whole house generator, there are permit and installation costs that need to be considered. Permit fees vary depending on your location and local regulations. Additionally, hiring an electrician and plumber is essential for the safe and proper installation of the generator. The cost of these professional services will contribute to the overall installation costs. You will also need to consider the cost of a transfer switch and potentially a subpanel, which allows you to safely connect your generator to your home’s electrical system.


The location of your home can also affect the cost of installing a whole house generator. Local regulations and building codes may impose additional requirements or restrictions, which can add to the overall cost. The accessibility of your property, including the ease of transporting and installing the generator, can also impact the cost. Additionally, the terrain and foundation preparation needed for the installation can add to the expenses.

Generator Capacity

Determining Factors

To determine the generator capacity needed for your home, several factors should be considered. These factors include the size of your home, the number of electrical appliances you wish to power during an outage, and any specific power requirements you may have, such as medical equipment. Consulting with a professional can help you accurately assess your needs and determine the appropriate generator capacity.

Cost Range

The cost range for generator capacity can vary significantly based on the size and capacity required. Generally, smaller generators with a capacity of around 10-15 kW can cost between $3,000 and $6,000, while larger generators with capacities of 20-30 kW or more can cost between $6,000 and $15,000 or higher. The cost includes the generator itself, any necessary accessories, and professional installation.

How Much Does It Cost To Install A Whole House Generator?

Type of Generator

Portable Generators

Portable generators offer a cost-effective solution for providing temporary power during emergencies. They are smaller in size, less expensive, and can be easily moved around. Portable generators typically range in capacity from 3,000 to 9,000 watts, which can power essential appliances and electronics but may not be sufficient to cover the entire home’s energy needs. The cost of a portable generator can range from $400 to $2,000 or more, depending on the capacity and brand.

Standby Generators

Standby generators are permanently installed and automatically turn on during a power outage. They are connected to the home’s electrical system, ensuring seamless power supply to the entire house. Standby generators offer a more convenient and reliable solution, but they come at a higher cost. A standby generator can range in capacity from 20 kW to 48 kW or more, and the cost can vary between $5,000 and $15,000 or higher, including installation.

Cost Comparison

While portable generators are more affordable, they may not offer the same level of convenience and coverage as standby generators. Standby generators are a long-term investment, providing reliable and automatic power during outages. Considering your specific power requirements, budget, and long-term needs is crucial in determining the right type of generator for your home.

Fuel Type

Natural Gas

Using natural gas as a fuel source for your whole house generator offers several benefits. Natural gas is a reliable and readily available source of fuel, with a constant supply from utility lines. The cost of natural gas is generally lower compared to other fuel options, providing cost savings in the long run. The initial installation cost for a natural gas generator can range from $7,000 to $15,000 or more, depending on the size and capacity.

Liquid Propane

Liquid propane is another popular fuel option for whole house generators. Propane tanks are installed on the property, ensuring a constant supply of fuel. While propane itself may be more expensive than natural gas, propane generators are often more affordable than natural gas generators. The installation cost for a liquid propane generator can range from $5,000 to $12,000 or more.


Diesel generators offer excellent fuel efficiency and are known for their durability. They are often preferred in areas with unreliable or inaccessible natural gas or propane supplies. Diesel generators tend to have higher upfront costs compared to other fuel options. The installation cost for a diesel generator can range from $6,000 to $25,000, depending on the size and capacity.

Cost Comparison

When comparing fuel types, it’s essential to consider both the initial installation cost and the ongoing fuel expenses. While natural gas may have higher installation costs, the lower cost of fuel can offset this over time. Propane offers a balance between affordability and convenience, while diesel generators may have higher upfront costs but lower fuel expenses in certain circumstances. Evaluating your specific needs and fuel availability in your area is crucial in making an informed decision.

How Much Does It Cost To Install A Whole House Generator?

Permit and Installation Costs

Permit Fees

Before installing a whole house generator, it’s important to check local regulations and obtain the necessary permits. Permit fees can vary depending on your location and the size of the generator. It’s advisable to consult with your local authorities or a professional contractor to ensure compliance with regulations and obtain accurate permit cost estimates.

Electrician and Plumbing Costs

Installing a whole house generator requires professional electrical and plumbing work to ensure safety and proper functionality. Hiring licensed electricians and plumbers is essential for the installation process. The cost of these professional services will depend on factors such as the complexity of the installation, local labor rates, and any additional electrical or plumbing work required.

Transfer Switch and Subpanel Costs

A transfer switch is a crucial component of a whole house generator installation. It allows for the safe and automatic transfer of power from the utility grid to the generator. The cost of a transfer switch can range from $500 to $2,000, depending on the type and capacity. Additionally, if your electrical panel does not have sufficient capacity to accommodate the generator, a subpanel installation may be necessary, adding to the overall cost.


Local Regulations

Local regulations and building codes can significantly impact the cost of installing a whole house generator. Some areas may have specific requirements that need to be met, such as noise restrictions or setback distances from neighboring properties. It’s important to familiarize yourself with these regulations and factor in any additional costs associated with compliance.


The accessibility of your property can affect both the installation process and the associated costs. If your property is challenging to access due to terrain, narrow roads, or other obstacles, additional equipment or labor may be needed, leading to increased expenses.

Terrain and Foundation Preparation

The terrain and foundation preparation required for the generator installation can also impact the cost. If your property has slopes, rocky terrain, or poor soil conditions, additional work may be necessary to ensure a stable and solid foundation for the generator. Excavation, grading, and foundation construction costs should be taken into account when budgeting for the installation.

Additional Considerations

Maintenance and Repair Costs

In addition to the upfront installation costs, it’s important to consider the ongoing maintenance and repair costs associated with a whole house generator. Regular maintenance is necessary to ensure the generator’s reliability and prolonged lifespan. Maintenance costs can range from $200 to $500 per year, depending on the type and size of the generator. It’s also advisable to budget for any potential repair expenses that may arise over time.

Extended Warranties

Many generator manufacturers offer extended warranties that provide additional coverage beyond the standard warranty period. While extended warranties can increase the upfront cost, they offer peace of mind and protection against unexpected repair or replacement expenses. It’s worth considering whether an extended warranty is a worthwhile investment for your specific situation.

Professional Installation vs. DIY

While it may be tempting to tackle the installation as a do-it-yourself project to save costs, it’s highly recommended to hire professionals for the installation. Professional installers have the expertise, experience, and knowledge to ensure the generator is correctly installed, according to local codes and regulations. Improper installation can lead to safety hazards, operational issues, and potential damage to the generator or your home’s electrical system.

Comparing Cost Estimates

Obtaining Multiple Quotes

To get an accurate understanding of the cost involved in a whole house generator installation, it’s advisable to obtain quotes from multiple contractors. This allows you to compare prices, services offered, and the reputation and experience of the contractors. Reach out to licensed and reputable contractors in your area and request detailed quotes outlining all the expenses involved.

Inclusions and Exclusions

When comparing cost estimates, it’s important to carefully review the inclusions and exclusions. Ensure that each quote specifies the equipment, materials, labor, permits, and any additional services or fees. Pay attention to any exclusions that may require additional expenses not included in the initial quote.

Reputation and Experience of Contractors

When choosing a contractor for the installation, consider their reputation and experience in the field. Read reviews, check references, and ask for proof of licenses and insurance. Working with a reputable and experienced contractor can provide peace of mind and ensure a smooth and efficient installation process.

Average Cost Range

Low-End Estimate

For a small portable generator installation, the low-end estimate can range from $2,000 to $5,000. This estimate includes the cost of the generator, accessories, permit fees, and professional installation. The capacity of the generator in this range would generally be around 10 kW or less.

High-End Estimate

For a large standby generator installation, the high-end estimate can range from $15,000 to $30,000 or more. This estimate includes the cost of the generator, transfer switch, subpanel, permit fees, professional electrical and plumbing work, and installation. The capacity of the generator in this range would typically be around 25 kW or higher.


Investing in a whole house generator is a significant decision that requires careful consideration of various factors. Understanding the factors that affect the cost, such as generator capacity, fuel type, permit and installation costs, location, and additional considerations, can help you make an informed choice. By obtaining multiple quotes, comparing prices and services, and working with reputable contractors, you can ensure a smooth and successful installation process. While the upfront costs may seem high, the long-term benefits of having a reliable power source during outages can outweigh the initial investment. Ultimately, choosing a whole house generator offers peace of mind and ensures the comfort and safety of your home and family.

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