How Much Does It Cost to Hire a Home Energy Auditor?

Typical Range:

$208 - $672

Find out how much your project will cost.

Cost data is based on actual project costs as reported by 766 HomeAdvisor members. Embed this data

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  • Homeowners use HomeAdvisor to find pros for home projects.
  • When their projects are done, they fill out a short cost survey.
  • We compile the data and report costs back to you.

Published January 10, 2022

Written by HomeAdvisor.

Home Energy Audit Costs

A home energy audit costs anywhere from $100 to $1,650 with an average of $412. Most homeowners spend between $208 and $672. You'll spend anywhere from $0.08 to $0.50 per square foot with a minimum of $100 to $200. Blower door and duct leakage tests run $150 to $200 when performed alone though only an additional $35 to $50 when combined with a basic analysis.

A home energy assessment, also known as an energy audit, can tell you how much gas and electricity your house consumes and identify ways you can make it more efficient. An assessment will show you problems that, when fixed, save you 5% to 30% on your utility bills. Most professionals have either a HERS or BPI Certification, though neither is necessary.

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National Average $412
Typical Range $208 - $672
Low End - High End $99 - $2,000

Cost data is based on actual project costs as reported by 766 HomeAdvisor members.

Energy Audit Costs Per Square Foot

Home audits typically cost $0.08 to $0.50 per square foot with a minimum cost of $100 to $200. A larger house increases the total price. For a 1,200 square foot home, expect to pay $100 to $150 while one in the 2,500 to 5,000 square foot range will run $200 to $300. Most companies charge a flat rate.

  • Simple assessments: $0.08-$0.12 per square foot. Take between 1-3 hours. These are generally just a visual walk through of your property.

  • Moderate to extensive tests: $0.12-$0.50 per square foot. Take anywhere from 3-6 hours to complete. These use manual and mechanical testing to look for leaks, inefficient electrical use and poorly performing appliances. You'll also receive a thorough review of past energy bills to determine potential areas for improvement.

What Does a Home Energy Assessment Include?

When the professional comes to your home, they will perform a variety of tests depending on the level of audit you requested.

Simple audits:

  1. An explanation of the process.

  2. A walk-through visual inspection, including one or more of the following:

    • Exterior walls, foundation and roof.

    • Heating and cooling system.

    • Water heating and usage systems.

    • Ductwork and ventilation.

    • Doors and windows.

    • Appliances and lighting.

  3. Final Report.

Advanced audits include everything from a simple analysis and one or more of the following:

  1. An analysis of energy usage.

  2. Manual tests, including one or more of the following:

    • Blower door test: A blower door test determines air-tightness by finding leaks.

    • Infrared scanning: thermography or infrared scanning to detect thermal defects and air leakage in building envelopes.

    • Duct leakage testing.

    • Moisture testing.

    • Appliance and wattage testing.

Average Cost of an Energy Audit by ASHRAE Level

the average cost to hire a home energy auditor is $420 or $100 to $2,000

This commercial-level audit can range anywhere from $150 to $1,600 or more. ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers) has determined three levels of detail that each take increasing time, engineering knowledge and equipment to complete.

  • Level 1: A walk-through and visual inspection. This evaluation uses little or no equipment and points out obvious areas for home energy improvement.

  • Level 2: Energy Survey and Engineering Analysis. This level reviews past power uses through utility bills and determine how the building currently uses gas and electricity.

  • Level 3: Detailed Analysis of Capital Intensive Modifications. This final level looks at the technical aspects of cost intensive renovations.

Home auditors will use a variety of methods from each commercial level appropriate to your house style, age and location.

Cost to Hire a Commercial vs. Residential Energy Auditor

Commercial costs range too widely to confidently predict, while residential fees tend to range in the $100 to $1,900 range and often free under government subsidized conditions for lower income households. The same professionals typically work in both environments.

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HERS Energy Rating Cost

HERS Index Rating, or the Home Energy Rating System, costs run anywhere from $150 to $600, though prices exceeding $1,000 have been reported. HERS Ratings and Certifications are independent of each other and have separate costs.

The HERS rating scale is for comparing your house to those locally and nationally. While a HERS test uses much of the same equipment and procedures, it has a different purpose from an energy audit.

HERS Rating vs. Energy Audit
HERS RatingEnergy Audit
For Realtors & BuildersFor Homeowners
Assigns a rating for comparisonFinds energy loss areas
Optional certificationNo certifications offered
Required for some rebatesRebates from efficiency improvements
  • HERS Rating

    • Used by real estate professionals and the mortgage industry. Not often used by homeowners.

    • Runs from 0 to 250. The lower the rating, the more efficient. A HERS rating compares your homes efficiency to those of others.

  • Energy Audit

    • Used by homeowners to understand where energy loss is happening in the home.

    • Identifies areas where energy loss occurs such as leaks and faulty and old appliances.

    • Similar tests used but for a different purpose.

    • Though not always required by states to carry out an audit, professionals may carry certifications from RESNET or BPI (Building Performance Institute).

HERS Certification Prices

HERS certifications are available during testing for an additional cost. Pricing varies from $150 to $250 with each additional certification running between $50 to $100. Certifications include duct leakage, refrigerant charge verification, cooling coil airflow, fan watt draw, high EER and Infiltration verification (blower door).

HERS Certifications are sometimes required by states to receive energy credits and rebates, like for California's Title 24 compliance credit. These certifications are typically used by real estate professionals and builders. Rarely will a homeowner need to seek out a HERS test or certification.

BPI Certified Energy Auditor

The Building Performance Institute, BPI, offers multiple certifications for home building professionals. One of which is for an energy auditor. The only difference between a BPI certified professional and one without any certifications is the peace of mind that comes from an industry trained professional. A BPI certification means the professional has:

  • A minimum of 1,000 hours of relevant work experience, such as operating as an auditor or in a lead role in a weatherization trade.

  • Experience performing home energy audits.

  • Additional combination of two of the following:

    • 2,000+ hours of trade experience.

    • 80+ hours of Professional training.

    • Certifications in the building trade relevant to energy or building sciences.

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Blower Door Test Cost

Blower door tests cost an average of $200 to $350 as a standalone test. As an add-on test for larger audits, it can run as little as $50. Depressurization tests are the most common form of a whole-home leak test. This test finds the most common and easily fixable leaks that are otherwise invisible with just a walk through inspection.

The process involves:

  1. Attaching a fan in a sealed doorway to depressurize the home - purposely creating a draft. It simulates a 15-25 mph wind that sucks the air out, forcing air in at leak locations.

  2. During this, the professional walks around with a uses 100% nontoxic smoke to identify the locations of leaks.

  3. Your professional will point out where they are in the final report or may have you walk around with them.

Most common leaks are around windows, foundations, in attics and around doors. These are cheap and easy to fix with caulk, spray foam and weather stripping.

Leak & Weather Stripping Repair Costs

Simple fixes cost anywhere from $20 to $800 depending on how extensive the repairs are. Replacing weather stripping averages $130 to $400 for a handyman.

This can be a DIY job for a handy and experienced homeowner. After applying weather stripping, use calk and small cans of spray foam at $5 to $50 to seal other leaks.

Duct Blaster or Leakage Testing Cost

Duct leakage tests cost anywhere from $50 to $200 depending on if it is a standalone test or done with a full audit.

HVAC professionals and home energy auditors both perform these tests. They're also completed for HERS certification. This will help determine if any leaks are present in your ducts and where those leaks are located. Repairing ductwork costs $400 to $1,900.

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Savings, Rebates & Other Considerations

You'll save between 5% to 30% on home energy costs when you make improvements identified by an audit. Your improvements may also qualify for a local, state or federal rebate. Check with both your contractor and your electrical and gas companies about these rebates.

Environmental Responsibility.

An audit can provide satisfaction for those interested in conserving energy for the sake of the environment. It's estimated that 20% of greenhouse gas emissions in the US are due to our homes. Making your home more efficient means that your home has less of a negative impact on the environment and your family.

If you were to add up all the tiny leaks, like those around windows and doors, it would equal a 2-foot hole. That's the equivalent of leaving a window open for 24-hours a day, year-round. While a home needs to have some air transfer to maintain a healthy living environment, increasing your home's efficiency helps lower your carbon footprint.

Energy Saving Home Improvement Costs

Getting an audit is a good way to find out where heating and air conditioning may be escaping your home. It also highlights the areas of your home that are not efficient. Be prepared for the possibility that you might need to make extensive fixes and updates to your home, especially if it is older, to truly make your home energy efficient.

Average costs to upgrade your homes efficiency:

The large upfront investment not only qualifies you for rebates, but also pays for itself in the long run.

How to Find and Hire an Energy Audit Inspector

The long-term savings of having a home energy audit far outweigh the costs and the simple home improvement projects you'll likely want to undertake. With savings ranging from 5% to 30% on your utility bills, the analysis and many improvements can quickly pay for themselves. Not only does the professional identify areas where improvements are needed, but most help identify which home improvements offer the best return on your investment.. The first step is the easiest find an energy auditor near you today.

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