How Much Does a Radon Inspection Cost in 2025?

This article was updated using automation technology and thoroughly reviewed for accuracy by HomeAdvisor Editor Ryan Noonan.

Radon inspections keep your home safe. Average radon inspection costs range from $146 to $713, with an average of $421. By scheduling a test every two years, you’ll catch elevated levels early and avoid long-term health risks. 

The Environmental Protection Agency recommends that all homes be tested to ensure the gas is below recommended safety levels. Radon is a radioactive, odorless, colorless gas and the second leading cause of lung cancer in the United States. Exposure to elevated levels of radon poses serious health risks to you and your family.

Cost Factors for Radon Inspection and Testing

Radon inspection costs can vary based on several factors. Different testing methods, such as short-term and long-term tests, vary in cost and accuracy. Additional services, like continuous monitoring or combining radon testing with a general home inspection, can also impact the overall cost.

Test Type

There are two types of radon testing: using an at-home test kit or hiring a professional to come to your home and do the test for you. Here’s how these two methods compare:

DIY radon test kits cost an average of $146, depending on the model and features. While DIY kits are less expensive, they may not provide the same level of accuracy and reliability as professional testing. Passive devices, which can be either short-term or long-term, don’t require power and are sent to a lab for analysis. Active devices are long-term and need power to continuously monitor radon levels in your home.

Although DIY kits may seem cost-effective, they are susceptible to user error and environmental interference, potentially leading to inaccurate results. Hiring a certified professional ensures accurate and reliable testing using advanced equipment and expertise. Professionals follow strict protocols to deliver precise results, safeguarding the health and safety of your household.

Testing Method

Several different radon testing methods are available. Here are the average costs for each type.

Short-Term Home Kits

Short-term charcoal kits cost $100 at most hardware stores. You’ll set the canister in the lowest livable level for two days, mail it to the lab, and wait for the report. Because radon levels swing with weather and ventilation, using two kits at once gives you a more dependable snapshot.

Long-Term Home Kits

Long-term kits, which can be passive or active, measure radon levels over an extended period, providing more accurate results. If a short-term test detects a problem, homeowners often use long-term tests to confirm the results and monitor levels over time.

• Active long-term sensors or continuous monitors: $420 and display regular reports of current radon levels in your home.

• Passive long-term kits: $1,200 in hardware stores or online. The alpha-track model collects particles for up to 91 days to a year with a plastic strip.

Water Testing Kits

Hiring a radon testing professional to measure radon levels in your water costs $146. This involves collecting a water sample and sending it to a lab for analysis.

The Centers for Disease Control recommends searching state-certified laboratories to check private ground wells once a year. If radon is found in the well, a pro will install a water mitigation system, which averages $4,500.

Home Size

Bigger, multi-level homes often need more than one monitor to get an accurate reading, so expect the price to climb as your square footage does. Your inspector will decide how many devices to use based on your home’s layout and their testing method.

Region

If you live in a hot real estate market, you’ll likely pay more simply because demand is higher. Get quotes from a few local pros before you book so you know you’re getting a fair price.

Travel Expenses

Some testing companies may add a travel expense if your home is outside their service radius. Contact a local radon testing pro near you for a quote to ensure there are no unexpected fees.

Radon Testing With a Home Inspection

Most inspectors offer radon testing as part of a standard home inspection during real estate transactions. Adding radon testing costs between $90 and $250. Because the inspector is already on-site, it’s often more cost-effective to include radon testing with an overall inspection rather than scheduling a standalone measurement.

Mitigation Systems

If tests come back high, call a certified local mitigation pro right away. They’ll walk you through the options and the costs so you can choose the solution that works best for your home and budget.

Radon mitigation systems may involve installing fans, pipes, and filters in specific areas of your house. These systems function similarly to installing a central humidifier or air purifying system.

Sealing

Sealing gaps around utility pipes, basement floor cracks, and foundation cracks can reduce radon entry from the soil, lowering mitigation costs and decreasing radon levels.

Ventilation

Ventilation systems use fans to draw fresh air into the house, forcing existing air to exit through windows and vents. While ventilation can help reduce radon levels, maintaining indoor temperatures during colder months can be challenging. Heat recovery ventilators mitigate heat loss by using exhausted air to warm or cool incoming air.

Suction

Various suction methods draw radon gas outdoors, diluting its concentration inside the home.

Submembrane suction works similarly to sub-slab suction for houses with crawlspaces. A heavy plastic sheet covers a dirt floor. Then, a pro inserts a pipe into the ground beneath. A fan connected to the pipe creates a vacuum to expel the gas.

Block-wall suction attaches to basements with hollow block foundation walls. Suction can also connect to water drainage systems like drain tiles or sump pumps. 

Sub-Slab

Sub-slab suction, or depressurization, is used for homes with a basement or slab-on-grade foundation. Pipes inserted through or beneath the floor slab reach into the soil below. A fan creates a vacuum that draws radon from beneath the house and vents it outside. This method is the most common and effective system, but also the most expensive.

DIY vs. Hiring a Pro

DIY kits are cheap, but they’re easy to misplace, misread, or contaminate, so the results can be shaky. A certified inspector brings lab-grade monitors, knows exactly where to set them, and follows strict protocols. Hiring a pro means whole-house coverage, reliable data, and real peace of mind against radon.

How HomeAdvisor Gets Its Cost Data

No place is more important than your home, which is why HomeAdvisor connects homeowners with local pros to transform their houses into homes they love. To help homeowners prepare for their next project, HomeAdvisor provides readers with accurate cost data and follows strict editorial guidelines. We surveyed thousands of real customers about their project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects.