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Avatar for Square One Radon, LLC

Square One Radon, LLC

5.00(
40
)
Approved Pro

Square One Radon, LLC

5.00(
40
)
Approved Pro
Super Service Award
Customers say: Quick response
5 years of experience
Free onsite estimate

Square One Radon is the premier choice for radon measurement and mitigation on all projects small and large, old and new. Owner and founder, Rob Hartop, brings over 12 years of radon industry experience along with a multitude of credentials including NRPP specialty certifications for new construction, multifamily, and advanced mitigation techniques. We are licensed in the State of Colorado, and are fully insured, certified, and bonded. We can mitigate any home or building, and will give you a free quote right away. Ask about our industry-leading guarantee!

"The Square One Radon team was fantastic. I had been putting this off for a while, but am so happy to have it done. Peace of mind. The team was very professional, friendly, and easy to work with. Highly recommend!"

Matthew U on November 2025

Square One Radon is the premier choice for radon measurement and mitigation on all projects small and large, old and new. Owner and founder, Rob Hartop, brings over 12 years of radon industry experience along with a multitude of credentials including NRPP specialty certifications for new construction, multifamily, and advanced mitigation techniques. We are licensed in the State of Colorado, and are fully insured, certified, and bonded. We can mitigate any home or building, and will give you a free quote right away. Ask about our industry-leading guarantee!

"The Square One Radon team was fantastic. I had been putting this off for a while, but am so happy to have it done. Peace of mind. The team was very professional, friendly, and easy to work with. Highly recommend!"

Matthew U on November 2025


Avatar for All Colorado Radon Mitigation Inc

All Colorado Radon Mitigation Inc

4.97(
38
)
Approved Pro

All Colorado Radon Mitigation Inc

4.97(
38
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
13 years of experience

Family owned and operated Radon Mitigation Company. We design and install custom mitigation systems to fit your house. Guaranteed to reduce radon levels to an acceptable level while being aesthetically pleasing to the eye. No obligation site visits and estimates. Check, CC's and Financing available upon request.

"All Colorado Radon Mitigation, Inc. is an incredible company to work with. They perform quality work, and they are truly friendly and professional. The system that they installed was straightforward, but the work was top-notch. Highly recommend!"

Seth N on July 2024

Family owned and operated Radon Mitigation Company. We design and install custom mitigation systems to fit your house. Guaranteed to reduce radon levels to an acceptable level while being aesthetically pleasing to the eye. No obligation site visits and estimates. Check, CC's and Financing available upon request.

"All Colorado Radon Mitigation, Inc. is an incredible company to work with. They perform quality work, and they are truly friendly and professional. The system that they installed was straightforward, but the work was top-notch. Highly recommend!"

Seth N on July 2024


Avatar for RemediH2O

RemediH2O

5.00(
1
)
Approved Pro

RemediH2O

5.00(
1
)
Approved Pro
Emergency services offered

Our 5-star disaster response experts provide on-demand emergency services including flood response and restoration, water damage restoration, fire and smoke damage restoration, and mold remediation to Colorado residents in the Roaring Fork Valley and beyond. We're a locally owned and operated team of certified technicians who provide residential and commercial restoration including insurance assistance for an easy, stress-free experience.

Our 5-star disaster response experts provide on-demand emergency services including flood response and restoration, water damage restoration, fire and smoke damage restoration, and mold remediation to Colorado residents in the Roaring Fork Valley and beyond. We're a locally owned and operated team of certified technicians who provide residential and commercial restoration including insurance assistance for an easy, stress-free experience.


Avatar for Square One Radon LLC

Square One Radon LLC

5.00(
1
)
Approved Pro

Square One Radon LLC

5.00(
1
)
Approved Pro
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
5 years of experience

Fully certified and locally owned, Square One Radon offers full service radon testing, radon mitigation, crawlspace encapsulation, and new construction radon services. Square One stands apart from the competition by utilizing the most scientific and calculated approaches to providing radon testing and mitigation solutions. Precise measurements to determine and document air flow, air pressure, pressure field extension, and more are routine practice at Square One. Unfortunately, many radon companies do not invest in the tools, training and techniques required to provide the most effective and efficient solutions to radon problems. Square One Radon was founded with the ideal of offering some of the most advanced, reliable, and proven testing and mitigation technologies in an affordable and practical solution for homeowners, businesses, schools, and other clients. Rob Hartop, Owner and Founder, brings eight years of experience in the radon industry to the Western Slope of Colorado along with his NRPP certifications in both radon testing and radon mitigation. Rob is also a member of the American Association of Radon Scientists and Technologists (AARST), spent over 12 years working in customer relations, has over four years experience in automotive and industrial fluid line fabrication, and holds a Bachelor of Business Adminnistration with concentrations in finance and economics.

"Square One Radon was professional, knowledgeable, reasonably priced, prompt, and did a beautiful job. The company's owner, Rob is the best. I would recommend his company enthusiastically and without any reservations. I'm a retired consumer-protection lawyer, so I know an outstanding company when I see one."

Pat T on January 2023

Fully certified and locally owned, Square One Radon offers full service radon testing, radon mitigation, crawlspace encapsulation, and new construction radon services. Square One stands apart from the competition by utilizing the most scientific and calculated approaches to providing radon testing and mitigation solutions. Precise measurements to determine and document air flow, air pressure, pressure field extension, and more are routine practice at Square One. Unfortunately, many radon companies do not invest in the tools, training and techniques required to provide the most effective and efficient solutions to radon problems. Square One Radon was founded with the ideal of offering some of the most advanced, reliable, and proven testing and mitigation technologies in an affordable and practical solution for homeowners, businesses, schools, and other clients. Rob Hartop, Owner and Founder, brings eight years of experience in the radon industry to the Western Slope of Colorado along with his NRPP certifications in both radon testing and radon mitigation. Rob is also a member of the American Association of Radon Scientists and Technologists (AARST), spent over 12 years working in customer relations, has over four years experience in automotive and industrial fluid line fabrication, and holds a Bachelor of Business Adminnistration with concentrations in finance and economics.

"Square One Radon was professional, knowledgeable, reasonably priced, prompt, and did a beautiful job. The company's owner, Rob is the best. I would recommend his company enthusiastically and without any reservations. I'm a retired consumer-protection lawyer, so I know an outstanding company when I see one."

Pat T on January 2023


Avatar for Stanton Engineering Solutions Inc.

Stanton Engineering Solutions Inc.

New on AngiNew on Angi
Approved Pro

Stanton Engineering Solutions Inc.

New on AngiNew on Angi
Approved Pro
20 years of experience
Free onsite estimate

Stanton Engineering Solutions, Inc. is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business.

Stanton Engineering Solutions, Inc. is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business.


Avatar for RCPI Residential Commercial Property Inspections

RCPI Residential Commercial Property Inspections

4.98(
85
)

RCPI Residential Commercial Property Inspections

4.98(
85
)
Customers say: Super punctual
Recommended by 98% of Angi customers
Recommended by 98% of HomeAdvisor customers

10 % FOR ALL VETERANS.... This is a veteran-owned business RCPI Home Inspections aims to provide accurate and reliable residential/ commercial reports to our current and potential customers with a friendly demeanor. We empower the customer to properly evaluate the facts, prior to making a substantial investment on a facility or dwelling. We provide inspection services across Colorado. From Denver To Pueblo & East To West.

"Nate did an excellent and thorough job, finding important laws that compromised safety as well as cosmetic imperfections which could be improved.. he also took all the time needed to explain his findings verbally as well as in his extensive and detailed report.. he even suggested ways to increase the safety and efficiency regarding repairs. So very thorough and trustworthy!"

Cheryl B on March 2020

10 % FOR ALL VETERANS.... This is a veteran-owned business RCPI Home Inspections aims to provide accurate and reliable residential/ commercial reports to our current and potential customers with a friendly demeanor. We empower the customer to properly evaluate the facts, prior to making a substantial investment on a facility or dwelling. We provide inspection services across Colorado. From Denver To Pueblo & East To West.

"Nate did an excellent and thorough job, finding important laws that compromised safety as well as cosmetic imperfections which could be improved.. he also took all the time needed to explain his findings verbally as well as in his extensive and detailed report.. he even suggested ways to increase the safety and efficiency regarding repairs. So very thorough and trustworthy!"

Cheryl B on March 2020


Avatar for Environmental Testing & Research Laboratories, Inc

Environmental Testing & Research Laboratories, Inc

4.85(
347
)

Environmental Testing & Research Laboratories, Inc

4.85(
347
)
Customers say: True professional
Recommended by 93% of Angi customers
Recommended by 93% of HomeAdvisor customers

ETR Laboratories in an analytic laboratory with a broad range of commercial, industrial and individual clients. We provide analytic services using a wide variety of scientific methods including GC/MS, IC/MS, GIR, NMR and SEM equipment. We can do particle analysis, organic and inorganic chemical analysis and micro analysis on biological and other materials. Private water analysis is our specialty. Award winning. Additional DBA - Environmental Testing & Research Laboratories Inc, ETR Labs, ETR Laboratories.

"as advertised"

Nancy C on July 2018

ETR Laboratories in an analytic laboratory with a broad range of commercial, industrial and individual clients. We provide analytic services using a wide variety of scientific methods including GC/MS, IC/MS, GIR, NMR and SEM equipment. We can do particle analysis, organic and inorganic chemical analysis and micro analysis on biological and other materials. Private water analysis is our specialty. Award winning. Additional DBA - Environmental Testing & Research Laboratories Inc, ETR Labs, ETR Laboratories.

"as advertised"

Nancy C on July 2018


"Greg was absolutely great----arrived early, incredibly professional, and found several things I suspect a lot of other competitors would have missed which were very much appreciated. The inspection went fast, but nothing was missed. This guy obviously knows his stuff, and we've already recommended him to a neighbor considering selling and buying a new house too. Again, great guy, highly professional and knowledgeable, and reasonably priced. A+++ Scott Hoffman"

Scott H on April 2019

We have closed in Colorado as of 2018

"Greg was absolutely great----arrived early, incredibly professional, and found several things I suspect a lot of other competitors would have missed which were very much appreciated. The inspection went fast, but nothing was missed. This guy obviously knows his stuff, and we've already recommended him to a neighbor considering selling and buying a new house too. Again, great guy, highly professional and knowledgeable, and reasonably priced. A+++ Scott Hoffman"

Scott H on April 2019


Avatar for Axium Inspections & Radon Mitigations

Axium Inspections & Radon Mitigations

4.90(
146
)

Axium Inspections & Radon Mitigations

4.90(
146
)
Customers say: Super punctual
Recommended by 98% of Angi customers
Recommended by 98% of HomeAdvisor customers

With 110% Best Price Guarantee, Axium offers the best priced home inspection with the best service! We pride ourselves on being a great resource for all real estate buyers and sellers in the Denver Metro area, Northern & Southern CO, as demonstrated in our over 5,000 5-star reviews. We are accredited and trusted and carry $1 million in Errors & Omissions and $2 million in General Liability. Established in 2007, our large team of Axium instructors have conducted over 120,000 inspections and are InterNACHI trained and certified – including six Certified Master Inspectors, considered to be the best in the world. Beyond home inspections, we offer radon testing and mitigation, mold inspections, well-water and water quality testing, Infra-red thermal inspections, wood-destroying organism, moisture and water inspections, damage-free lead based paint testing, sewer scopes, drone inspections, rental inspections, property inspections and commercial inspections. Axium is now also authorized to conduct residential rental property license inspections for the City of Denver. We offer flexible scheduling, same day service, holidays, and weekends. In addition to the 110% Best Price Guarantee, we also offer a 200% Satisfaction, a Buyers Protection Guarantee (if you decide against the home we inspect, we will inspect another free of charge in the next 30 days) and a Porch 90-Day Inspection Guarantee. In addition, home inspection customers receive a complimentary membership to Porch’s Home Assistant Gold Program which helps homeowners tackle everything on their move-in to-do lists. Axium strives to provide the best service at the best price! Call us today or visit us at https://www.axiuminspections.com.

"Axium Inspection did a thorough job on the inspection of my condo. Giving me explanations and pictures of various repairs and needs presented during the inspection."

Sheila P on October 2025

With 110% Best Price Guarantee, Axium offers the best priced home inspection with the best service! We pride ourselves on being a great resource for all real estate buyers and sellers in the Denver Metro area, Northern & Southern CO, as demonstrated in our over 5,000 5-star reviews. We are accredited and trusted and carry $1 million in Errors & Omissions and $2 million in General Liability. Established in 2007, our large team of Axium instructors have conducted over 120,000 inspections and are InterNACHI trained and certified – including six Certified Master Inspectors, considered to be the best in the world. Beyond home inspections, we offer radon testing and mitigation, mold inspections, well-water and water quality testing, Infra-red thermal inspections, wood-destroying organism, moisture and water inspections, damage-free lead based paint testing, sewer scopes, drone inspections, rental inspections, property inspections and commercial inspections. Axium is now also authorized to conduct residential rental property license inspections for the City of Denver. We offer flexible scheduling, same day service, holidays, and weekends. In addition to the 110% Best Price Guarantee, we also offer a 200% Satisfaction, a Buyers Protection Guarantee (if you decide against the home we inspect, we will inspect another free of charge in the next 30 days) and a Porch 90-Day Inspection Guarantee. In addition, home inspection customers receive a complimentary membership to Porch’s Home Assistant Gold Program which helps homeowners tackle everything on their move-in to-do lists. Axium strives to provide the best service at the best price! Call us today or visit us at https://www.axiuminspections.com.

"Axium Inspection did a thorough job on the inspection of my condo. Giving me explanations and pictures of various repairs and needs presented during the inspection."

Sheila P on October 2025


Avatar for ACE RADON CORPORATION

ACE RADON CORPORATION

4.78(
299
)

ACE RADON CORPORATION

4.78(
299
)
Customers say: Super punctual
Recommended by 92% of Angi customers
Recommended by 92% of HomeAdvisor customers

For 36 years, ACE Radon has earned a great reputation for Quality Radon Services at an affordable price. ACE utilizes cutting-edge technology exceeding National Radon Proficiency standards. ACE provides the most accurate and Certified testing methods, custom mitigation systems designed to provide the lowest possible radon levels and Air Purification Systems to provided relief for Allergies, Asthma and other lung problems. TEST FOR RADON, MITIGATE, IF NECESSARY AND PURIFY YOUR INDOOR AIR. RACE TO ACERADON.COM

"Outstanding service from Amanda who I contacted initially to Karl and Anthony who installed the radon system. My wife and I are extremely pleased. I would and have recommended Ace Radon to our friends and family. Thanks so much for everything."

Kenneth A on June 2023

For 36 years, ACE Radon has earned a great reputation for Quality Radon Services at an affordable price. ACE utilizes cutting-edge technology exceeding National Radon Proficiency standards. ACE provides the most accurate and Certified testing methods, custom mitigation systems designed to provide the lowest possible radon levels and Air Purification Systems to provided relief for Allergies, Asthma and other lung problems. TEST FOR RADON, MITIGATE, IF NECESSARY AND PURIFY YOUR INDOOR AIR. RACE TO ACERADON.COM

"Outstanding service from Amanda who I contacted initially to Karl and Anthony who installed the radon system. My wife and I are extremely pleased. I would and have recommended Ace Radon to our friends and family. Thanks so much for everything."

Kenneth A on June 2023

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Radon Detection and Reduction questions, answered by experts

Services test for allergens, mold, VOCs, and carbon monoxide levels to ensure a healthy indoor environment.

Since radon typically comes out of the soil, it is most commonly found in the lower levels of a home. In houses with basements, that's a common location for radon. Homes built directly on the ground may have radon on the ground floors. Radon can be found on the upper floors of the home, but often in lower concentrations than in lower levels.

Ideally, no one will live in a house with elevated radon levels, as prolonged exposure increases the risk of serious health issues like lung cancer. However, homes with radon can be made safe through mitigation systems, such as active soil depressurization. Testing for radon regularly and addressing high levels helps ensure a safe living environment.

Sampling typically takes 1-3 hours, and depending on the provider, lab results are available within 2-7 days.

Long-term exposure increases lung cancer risks. Prolonged homestay individuals and smokers encounter heightened vulnerability and exposure concerns.

The Mesa, CO homeowners’ guide to radon detection and reduction services

From average costs to expert advice, get all the answers you need to get your job done.

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