Radon Testing — Fort Collins & Northern Colorado
2026 Radon Testing Cost in Fort Collins
Radon testing does not have to be confusing or expensive. Drennen Custom Contracting provides professional 72-hour radon testing for homeowners, Realtors, home inspectors, property managers and real estate transactions throughout Fort Collins and Northern Colorado.
Our testing uses professional-grade E-PERM electret ion chamber devices. These passive instruments measure the average radon concentration over the full 72-hour test period without requiring an electrical outlet, internet connection or moving parts.
Whether a home already has an active mitigation system or has never been mitigated, the correct testing option depends on why the test is being performed, who will place and retrieve the device, and whether the result will be used in a real estate transaction.
Quick Answer: How Much Does a Radon Test Cost?
Drennen's current residential radon-testing prices range from complimentary testing for qualifying Realtor-supported real estate transactions to $150 for a test placed and retrieved by a licensed radon measurement professional.
A homeowner may also pick up, place and return an E-PERM test through Drennen for $50 when a professionally administered transaction test is not required. The pricing depends partly on whether the home already has an active radon mitigation system.
Colorado homeowners can learn more about radon risks, testing recommendations, and mitigation guidance through the Colorado Department of Public Health and Environment radon guidance and the EPA Citizen's Guide to Radon.
Homes With an Active Radon Mitigation System
An active system normally includes a radon fan that continuously draws soil gas from beneath the home and exhausts it outside.
Licensed Professional Test
$150A licensed radon measurement professional places and retrieves the 72-hour E-PERM test. This option is appropriate when professional device placement, documentation, system-performance verification, or licensed administration is important.
Homeowner Pickup and Return
$50The homeowner picks up the test from Drennen, receives written instructions and pictures, reviews the full process with an office staff member, and receives phone support when necessary. After the 72-hour test, the homeowner returns the device to Drennen for analysis and receives a formal results report.
Homes Without an Active Radon Mitigation System
Qualifying Realtor Real Estate Transaction
ComplimentaryDrennen offers complimentary testing when a Realtor is involved in a qualifying real estate transaction, the property does not already have an active radon system, and the property is within Drennen's primary local service area—approximately 50 miles from the Drennen office. The test is placed and retrieved by a licensed radon measurement professional. Scheduling, access and transaction requirements apply.
Property Managers
$75The $75 property-manager service includes placement and retrieval by a licensed radon measurement professional, along with a formal results report.
Home Inspectors
$150A licensed Drennen measurement professional places and retrieves the device. This allows the home inspector to coordinate access while Drennen remains responsible for professional radon measurement.
Homeowners — Licensed Professional
$150A licensed Drennen measurement professional places and retrieves the device and provides the formal result. This is the best choice for homeowners who want professional administration from start to finish.
Homeowner Pickup and Return
$50The homeowner receives the E-PERM device, written instructions, placement pictures, an office-staff walkthrough of the complete process and phone support when necessary. Drennen analyzes the returned device and provides a formal results report. This homeowner-directed option may not be appropriate when a licensed, independent transaction test is required.
Radon Testing Prices
| Situation | Service | Price |
|---|---|---|
| Home with active system | Licensed professional places and retrieves test | $150 |
| Home with active system | Homeowner pickup, placement, return, support and formal report | $50 |
| No active system | Qualifying Realtor real estate transaction within primary local service area | Complimentary |
| No active system | Property manager; licensed placement and retrieval included | $75 |
| No active system | Home inspector; licensed placement and retrieval | $150 |
| No active system | Homeowner; licensed placement and retrieval | $150 |
| No active system | Homeowner pickup, placement, return, support and formal report | $50 |
Bulk testing discounts
Tiered discounted pricing is available for qualifying bulk radon-testing projects. Contact Drennen for project-specific pricing based on the number of devices, building type, travel, placement, retrieval, reporting and quality-control requirements.
What Is a 72-Hour E-PERM Radon Test?
An E-PERM is a professional radon-measurement device known as an electret ion chamber. Inside the chamber is a specially charged component called an electret. During the test, radon diffuses into the chamber through a filtered opening. Radiation from radon decay ionizes the air inside the chamber, which causes a measurable reduction in the electret's electrical charge.
The difference between the device's starting and ending voltage, together with the exposure time, is used to calculate the average radon concentration during the test period. E-PERMs are passive integrating devices: they measure the average concentration across the exposure period rather than producing hour-by-hour readings.
Why Drennen Uses E-PERM Devices
- They measure the full test period. A 72-hour E-PERM produces an integrated average across the complete exposure period rather than a brief snapshot.
- They require no power or Wi-Fi. There is no electrical cord, battery failure, internet connection, fan, pump or moving component.
- They are quiet and unobtrusive.
- They are professionally analyzed. Proper handling, placement, timing, documentation and analysis remain essential.
- They are well suited to short-term testing. Drennen's 72-hour exposure exceeds the 48-hour minimum described in Colorado homeowner testing guidance.
Why Professional Placement Matters
A radon test can produce a misleading result when it is placed too close to a door, window, fan or supply register; set directly on the floor; disturbed during the exposure period; started or ended at the wrong time; conducted without closed-building conditions; or placed in the wrong level or room.
A licensed radon measurement professional is trained to select an appropriate location, document the conditions and administer the test according to the applicable protocol. Colorado recommends licensed professional testing for real estate transactions. Learn about hiring a licensed radon professional in Colorado.
Testing a Home That Already Has a Radon System
A mitigation system should not be assumed to be working merely because the fan is running. Testing can help determine whether the system is continuing to reduce radon effectively, whether building changes have affected performance, and whether inspection or service may be needed.
Periodic testing verifies the radon concentration in the occupied space. A fan, gauge or alarm can indicate that equipment is operating, but only a radon test measures the level inside the home. Learn about radon system repair and fan replacement.
Testing a Home Without a Radon System
Radon cannot be reliably predicted from the age of the home, a neighbor's result, whether the basement is finished or the apparent quality of construction. The only way to know the radon concentration in a particular home is to test it. Learn more about radon testing in Fort Collins.
What Happens After the Test?
Drennen provides the radon result in picocuries per liter, written as pCi/L.
Below 2.0 pCi/L
This is a favorable short-term result. Continued periodic testing is still recommended because radon levels can change.
Between 2.0 and 3.9 pCi/L
This is below the EPA action level, but additional testing or mitigation may still be worth considering based on risk factors and the purpose of the test.
At or Above 4.0 pCi/L
This result is at or above the EPA action level. Confirmatory testing or mitigation should be discussed with a licensed radon professional.
If a result is at or above 4.0 pCi/L, learn about radon mitigation options in Fort Collins.
Radon Testing for Real Estate Transactions
Real estate radon testing should be conducted within the inspection timeline, under appropriate closed-building conditions, with an approved professional-grade device, correct placement and documentation, licensed administration and clear reporting to the appropriate parties.
Bulk Radon Testing
Drennen offers tiered testing discounts for qualifying projects involving multifamily properties, apartment buildings, schools, classrooms, property-management portfolios, multiple real estate properties, builder developments, commercial facilities and institutional testing programs.
Pricing depends on the number of devices, building configuration, travel, placement requirements, retrieval schedule, reporting and quality-control requirements.
Commercial, multifamily and school radon testing →Frequently Asked Questions
Drennen's standard E-PERM test is exposed for approximately 72 hours. Scheduling, placement and retrieval timing may affect the total calendar time required.
A 72-hour test is a recognized short-term testing period and exceeds the 48-hour minimum described in Colorado homeowner guidance. It provides a useful measurement of the average radon concentration during the exposure period. Long-term testing can provide additional information about average exposure over a season or year.
No. An E-PERM is an integrating device. It measures the average concentration over the entire exposure period rather than producing an hourly graph.
The $50 option includes the E-PERM device, written instructions, placement pictures, a complete process review with an office staff member, phone support when necessary, device analysis and a formal results report.
It uses E-PERM measurement technology, but the administration is different. With the $50 option, the homeowner is responsible for pickup, placement, test conditions and return. Professional service includes placement and retrieval by a licensed measurement professional.
A self-placed test may not satisfy transaction requirements or the independence expected by the parties. Drennen recommends licensed, professionally administered testing for real estate transactions.
The offer applies to qualifying Realtor-supported real estate transactions when the property does not already have an active radon mitigation system and is within Drennen's primary local service area, approximately 50 miles from the office. Scheduling, access and transaction requirements apply.
Yes. The $75 property-manager price includes placement and retrieval by a licensed radon measurement professional and a formal results report.
Yes. A fan that appears to be operating does not confirm the radon concentration in the occupied space. Periodic testing verifies actual system performance.
Yes. Tiered discounts may be available for qualifying bulk testing. Contact Drennen with the property type, number of tests, locations and scheduling requirements.
Schedule a 72-Hour Radon Test
Testing is the only way to know the radon concentration in a home or building. Drennen offers testing options for homeowners, Realtors, home inspectors, property managers, builders, schools, multifamily properties and commercial facilities.
Prices shown are current planning prices and may be revised. Complimentary and discounted testing is subject to eligibility, the approximately 50-mile primary local service area, scheduling, property conditions and transaction requirements. Test results represent the radon concentration measured during the stated exposure period and do not guarantee future radon levels. Real estate, regulatory, warranty or legal requirements may call for professionally administered testing.
Drennen Custom Contracting | Fort Collins, CO | 970-482-9100 | office@drennencc.com