When getting a new home, where do I start with radon testing?

Quick Summary

Moving into a new home is one of life’s biggest milestones. Between inspections, paperwork, moving boxes, and planning your new space, it is easy to overlook one of the most underestimated, health-related steps you can take as a homeowner: test your home for radon.

According to the U.S. Environmental Protection Agency (EPA) and the U.S. Surgeon General, every home in America should be tested for radon, regardless of age, location, or construction type, with 1 in 15 homes estimated to have radon problems. Radon is invisible, odorless, and naturally occurring, but long-term exposure increases the risk of developing lung cancer if elevated levels go undetected.

This guide explains:

What radon is and why it matters
Why both new and existing homes should be tested
How radon testing works during the home-buying process
What your results actually mean
Why continuous radon monitoring is becoming increasingly important for homeowners

Why Radon Should Be on Every Home Buyer’s Checklist

When buying a new home, most people focus on visible concerns like roofing, plumbing, HVAC systems, or structural inspections. Indoor air quality often receives less attention, even though it directly affects the health and comfort of everyone living in the home.

That is where radon testing becomes important.

Radon is a naturally occurring radioactive gas created by the breakdown of uranium in soil, rock, and groundwater. Because it is colorless, odorless, and tasteless, it can accumulate inside homes without any obvious warning signs.

The gas typically enters through:

Foundation cracks
Construction joints
Gaps around pipes and utility lines
Crawl spaces and sump pits
Basement flooring openings

Once trapped indoors, radon levels can gradually build over time.

According to the EPA’s radon risk information, radon is the second leading cause of lung cancer in the United States and the leading cause among non-smokers. The agency estimates that approximately 21,000 lung cancer deaths each year are linked to radon exposure.

Does a New Construction Home Need Radon Testing?

One of the most common misconceptions among home buyers is that newly built homes are automatically safer from radon exposure.

In reality, new homes can still develop elevated radon levels.

Why New Homes Can Still Have High Radon Levels

Energy-Efficient Construction Can Trap Radon: Modern homes are built to improve energy efficiency by reducing airflow leakage. While this lowers heating and cooling costs, it can also reduce natural ventilation inside the home. As a result, radon entering from beneath the foundation may become trapped indoors more easily than in older, draftier homes.
Soil Conditions Matter More Than Home Age: Radon levels are influenced primarily by the geology beneath the property, not the age of the structure itself. A newly built home located on uranium-rich soil can still experience elevated indoor radon levels from the first day of occupancy.
Radon-Resistant Features Help, But Testing Is Still Necessary: Some new homes include radon-resistant construction techniques, such as:

Gas-permeable layers beneath the slab
Plastic sheeting
Sealed openings
Passive vent piping

These systems can reduce risk, but they do not guarantee low radon levels.

The EPA’s radon-resistant construction guidance still recommends testing every home after occupancy, even when radon-resistant features are installed.

Questions Worth Asking Your Builder

If you are purchasing a newly constructed home, it helps to ask a few important questions early in the process.

Was the home built with radon-resistant construction features?
Has the property been tested after construction?
Is there an existing passive vent pipe system?
Has a mitigation fan ever been installed?
Are previous radon test results available?

Builders who can clearly answer these questions and provide documentation often help buyers make more informed decisions.

Understanding the Radon Inspection Process During Home Buying

A radon inspection for home buyers is typically separate from a standard home inspection and should usually be requested specifically during the transaction process.

Is Radon Testing Included in a Home Inspection?

Not always.

Many general home inspections do not automatically include radon testing unless the buyer requests it separately. Before scheduling your inspection, confirm whether radon testing is included.

The EPA recommends using certified professionals through organizations such as:

National Radon Proficiency Program (NRPP)
National Radon Safety Board (NRSB)

Certified professionals follow established testing protocols that improve accuracy and reliability.

How Long Does a Radon Test Take During Home Buying?

Most real estate radon tests are short-term tests that run for 48 hours under closed-house conditions.

This means:

Windows remain closed
Exterior doors stay shut except for normal entry and exit
Ventilation changes are minimized during testing

These conditions help create a more accurate understanding of potential radon accumulation inside the home.

PRO TIP:

Many homes are purchased during the spring and summer months, when radon levels may appear lower due to increased natural ventilation, such as open windows, more frequent air exchange, and seasonal airflow patterns. As a result, short-term test results can feel reassuring but may not always reflect how the home performs year-round.

Installing a continuous radon monitor after moving in can help you better understand your home’s long-term radon trends and see how levels respond to seasonal weather changes, temperature shifts, and everyday living patterns.

➨ Quick Answer: What Happens if Radon Levels Are High?

If results come back at or above 4 pCi/L, the EPA recommends taking action to reduce exposure. Fortunately, radon mitigation systems are highly effective and can reduce radon levels by up to 99% in many homes.

High radon levels do not automatically mean a home purchase should be canceled. In many transactions, buyers and sellers negotiate mitigation solutions before closing. Every home can be fixed and radon levels reduced to safe levels.

Radon Test Results Explained

Understanding your radon report becomes much easier once you know the EPA benchmarks.

Radon Level	What It Means	EPA Recommendation
Below 2 pCi/L	Low risk	Continue monitoring
2–4 pCi/L	Moderate concern	Consider mitigation and ongoing monitoring
4 pCi/L or Higher	Elevated risk	EPA recommends taking action

The national average indoor radon level is approximately 1.3 pCi/L, while outdoor air averages around 0.4 pCi/L.

The EPA also notes that there is no completely safe level of radon exposure, which is why many homeowners choose to continue monitoring even when results fall below the action threshold (2- 4 pCi/L).

Why Continuous Radon Monitoring Matters After You Move In

A single radon test provides an important snapshot, but radon levels naturally fluctuate throughout the year.

Changes in:

Weather
Air pressure
Seasonal ventilation
HVAC usage
Humidity
Home renovations

can all affect indoor radon levels over time.

Pro Tip for New Homeowners

Radon levels fluctuate, often highest during colder months when homes remain sealed for longer periods. Continuous monitoring helps homeowners understand long-term exposure patterns rather than relying only on a single short-term reading.

This is one reason many homeowners now use continuous radon monitors rather than relying solely on traditional test kits, which must be repurchased for regular testing.

What to Look for in a Smart Radon Monitor

Modern radon monitors make long-term tracking much easier for homeowners who want ongoing visibility into indoor air quality.

Features That Matter Most

Real-Time Readings: Frequent updates help homeowners understand how radon levels fluctuate throughout the day and across seasons.
Long-Term Trend Tracking: Historical data provides a clearer picture of long-term exposure patterns than relying on a single isolated test result.
Mobile App Connectivity: Many smart monitors now allow homeowners to receive alerts and review data directly from their phones.
Easy Setup: Simple plug-and-play devices remove barriers that may discourage regular monitoring.

How Ecosense Supports Modern Radon Monitoring

Ecosense focuses on helping homeowners and professionals better understand indoor radon exposure through continuous monitoring technology.

Its devices use patented ion chamber technology designed to deliver fast, accurate readings while remaining easy for homeowners to use daily.

Ecosense monitors provide:

Real-time readings
Long-term trend analysis
Mobile app integration
Smart insights

The company’s home radon detectors, such as EcoQube and RadonEye, have also been evaluated in independent studies, including testing conducted through the Canadian National Radon Proficiency Program (C-NRPP)

The Smartest Start for Your New Home

Buying a home is a major life decision, and taking steps to protect your indoor environment from the beginning can provide long-term peace of mind.

Radon testing is simple, affordable, and strongly recommended by leading public health organizations across the United States. Whether you schedule testing during the home-buying process or begin continuous monitoring after moving in, understanding your home’s radon levels helps you make informed decisions for your family’s safety.

The most important thing is not to guess.

Start with a test, stay informed over time, and enjoy your new home knowing you have taken an important step toward healthier indoor air.

Frequently Asked Questions

Q1: Should I get a radon test before buying a house, even if it is newly built?

Yes. The EPA recommends testing every home for radon, including newly constructed homes with radon-resistant features. Modern homes are often more airtight for energy efficiency, which can allow radon to accumulate more easily indoors. Radon risk depends primarily on the soil beneath the home, not the age of the property. Testing is the only reliable way to know whether elevated levels are present.

Q2: What is involved in a radon inspection for home buyers?

A radon inspection typically involves placing a certified testing device in the lowest livable area of the home for at least 48 hours under closed-house conditions. The test is usually conducted by a professional certified through the NRPP or NRSB. Because radon testing is often separate from a standard home inspection, buyers should request it specifically during the transaction process.

If results come back at or above 4 pCi/L, mitigation options can often be negotiated before closing.

Q3: What radon level is considered safe in a home?

The EPA recommends taking action when radon levels reach 4 pCi/L or higher. Levels between 2 and 4 pCi/L may also warrant continued monitoring or mitigation, since there is no completely risk-free level of radon exposure.

For reference:

Average outdoor radon level: approximately 0.4 pCi/L
Average indoor radon level in U.S. homes: approximately 1.3 pCi/L

If elevated levels are found during a home purchase, it does not necessarily mean you should walk away from the property. Radon mitigation systems are highly effective and commonly installed across the United States.

Q4: Do newer homes have lower radon levels than older homes?

Not necessarily. Older homes may develop more foundation cracks and openings over time, while newer homes are often built with tighter construction that can trap radon indoors more efficiently.

Both new and older homes can experience elevated radon levels depending on:

Soil composition
Ventilation patterns
Foundation design
Seasonal conditions

This is why radon testing is recommended regardless of a home’s age.

Q5: Where should I place a radon monitor in my new home?

The best location is usually the lowest livable area of the home, such as a basement, family room, home office, bedroom, or main-level living space. Radon monitors should be placed away from windows, vents, exterior walls, and high-humidity areas like bathrooms or laundry rooms.

For larger homes or multi-level layouts, portable continuous monitors can help homeowners compare radon levels across different rooms and floors over time.