How to Start a Radon Mitigation Business

How do you start a radon mitigation business from zero to your first paying job?

Take an NRPP or NRSB approved mitigation course, pass the exam, check whether your state licenses radon work, buy insurance, fit out a truck with fans and PVC, then quote your first job.

This is a low-equipment, high-skill trade. The barrier is not money, it is knowing how to read a house, pick a suction point, size the fan and prove the system worked with a post-mitigation retest. That knowledge comes out of the certification course, so start there rather than with a truck wrap.

Coursework, exam and certification typically take four to six weeks. In one of the ten states that runs its own credential, add however long that application sits in the queue before you can legally quote.

• Pick your credential path. NRPP (run by AARST, now the Indoor Environments Association) or NRSB. Both are recognized nationally.
• Complete the required prep course. NRPP requires a 24-hour approved course for the Radon Mitigation Specialist credential and a 20-hour minimum for the Radon Mitigation Installer credential.
• Pass the exam and pay the certification fee. NRSB runs $125 for one year or $200 for two. NRPP runs about $250 for a two-year term.
• Check your state. Ten states run their own credential on top of national certification: Florida, Iowa, Illinois, Kansas, Maine, Minnesota, Nebraska, New Jersey, Ohio and Pennsylvania.
• Form the LLC, then buy general liability and errors and omissions coverage. E and O is not optional in a trade built on measurements.
• Buy a used continuous radon monitor so you can test and retest your own work instead of paying a lab for every job.
• Stock one truck: two RadonAway fans, Schedule 40 PVC in 3 inch and 4 inch, flexible couplings, radon sealant, U-tube manometers, and a rented rotary hammer with a core bit.
• Walk into three home inspection offices in EPA Zone 1 territory and offer to quote every failed test they produce. That is where your first job comes from.

What does it cost to start a radon mitigation business?

A lean one truck start runs roughly $3,500 to $8,000 if you already own a vehicle. Certification, insurance, a used continuous radon monitor and materials for the first few jobs are the big lines.

Radon mitigation is one of the cheapest trades to enter that still charges four figures a job. There is no excavator and no crane, and the biggest rig on the job site is a rotary hammer you can rent. Your two real capital items are a continuous radon monitor and a vehicle, and both can start used.

The number below assumes you already have a truck or van. If you buy a new service vehicle at around $45,000, that single line dwarfs everything else on the list, which is why almost every one-truck radon shop starts in a vehicle it already owns.

What licenses, certifications and insurance does a radon mitigator need?

There is no federal license. Ten states run their own credential, including Ohio, Pennsylvania and New Jersey. Everywhere else, NRPP or NRSB certification is the standard, plus general liability and errors and omissions cover.

Requirements vary a lot by state, so verify with your own state radon program before you spend a dollar. About 20 states have some form of radon credentialing program, and ten of those require a credential administered by the state itself. In the rest, an NRPP or NRSB certification is the de facto license, and it is what home inspectors and real estate agents will ask to see.

The work itself is held to ANSI/AARST SGM-SF-2023, the Soil Gas Mitigation Standard for Existing Homes, which took effect December 1, 2023. It covers residential structures no more than three stories above grade with no more than four attached dwelling units on one contiguous foundation. Bigger buildings fall under the companion SGM-MFLB standard. Read the standard you are certifying under, not a summary of it.

Carry both general liability and errors and omissions. General liability covers the hole you drilled through the slab. E and O covers the claim that your measurement or your system design was wrong, which in a trade built on pCi/L readings is the exposure that actually bites. Specialty programs from OREP, Morency and Associates, NRSB and the Indoor Environments Association all write this trade specifically.

What should you charge for radon mitigation?

Most residential systems sell for $800 to $2,500, with the typical basement job landing at $1,000 to $1,500. Fan replacements run $300 to $600 installed. Crawlspace work prices higher, at $1,500 to $4,000.

Price the system, not the hour. Homeowners compare radon quotes the way they compare water heaters, so a flat installed price with the post-mitigation retest included beats an hourly rate every time. Sub-slab depressurization is the default on slabs and basements and covers the large majority of residential jobs, so that is the number you will quote most.

Here is a worked example. Take a 1,600 square foot ranch with a poured basement and a test result of 6.8 pCi/L, well over the EPA action level of 4 pCi/L. You quote $1,500 for a single suction point sub-slab system. A standard way to split that price is $525 piping and core drill, $375 fan and vent stack, $300 labor, $180 retest and permit, and $120 sealing and exterior cladding. Your actual hard cost inside that $375 fan line is about $142 for a RadonAway RP145C plus the stack material, so most of that line is margin. If the house has a second foundation section, add $400 for the extra suction point and the job goes out at $1,900 for maybe two more hours on site.

One warning on the low end. Do not compete with the roughly $500 in materials a homeowner spends on a DIY system. They are not buying pipe, they are buying a certified system, a retest that proves it worked, and a warranty. If you price like a DIY kit you will make nothing on the callbacks.

How do you get your first radon mitigation customers?

Home inspectors and real estate agents drive most of the work, because radon testing usually happens during a sale. Build those referral relationships first, then add a Google Business Profile and local search.

Radon is almost never a want. It is a discovered problem, and the discovery happens on an inspection report during a real estate transaction, usually with a closing date two weeks out. That means the person who controls your pipeline is not the homeowner, it is whoever ran the test. Home inspectors, testing labs and listing agents are your sales force.

Run the math on a referral instead of an ad. One home inspection office that sends you two failed tests a month at a $1,400 average is $2,800 a month, every month, and it cost you a drive across town and a one-page price sheet. Ad spend cannot compound like that, because a homeowner who has never heard of radon is not searching for you until an inspection report hands them a number. Log the source of every call, by inspector name, from day one.

January is National Radon Action Month, an EPA awareness push. It is the one month a year when local media, health departments and libraries actively want a radon expert to talk to, and it lands right when readings are highest. Book that content in November.

• Visit home inspection offices in person with your certification number, your insurance certificate, and a one-page price sheet.
• Offer inspectors a same-week quote turnaround. Deals are on a clock, and speed wins more referrals than price does.
• Ask real estate brokerages if you can present at a sales meeting. Fifteen minutes on what a mitigation quote means for a deal is worth more than a mailer.
• Use the EPA Map of Radon Zones to pick which ZIP codes you drive to. Zone 1 counties produce far more failed tests per test run.
• Claim and fill out a Google Business Profile with photos of finished exterior stacks. Radon buyers search locally and buy fast.
• Keep every install in a list and call those customers when the fan hits end of life. A $300 to $600 fan replacement is repeat revenue you already earned.
• Introduce yourself to plumbers, HVAC contractors and crawlspace encapsulation crews. They find radon problems and do not want to fix them.

What tools, equipment and software do you need for radon mitigation?

You need a continuous radon monitor for testing, radon fans, Schedule 40 PVC, and a rotary hammer with a core bit. A used SunRADON 1028 and a RadonAway RP145C cover most jobs.

Split your kit into two piles: detection and mitigation. Detection is the continuous radon monitor and charcoal canisters. Mitigation is fans, pipe, sealant and the tools to open a slab. Neither pile is expensive by trade standards, which is why this business is often described as high-value and low-equipment-cost.

Fan sizing is the skill, not the shopping. An RP145 is a 4 inch fan drawing 41 to 72 watts and is the workhorse on open aggregate under a slab. A GP501 is a 3 inch fan drawing 68 to 146 watts and is what you reach for on tight soil where you need pressure instead of flow. Guess wrong and your retest fails, so carry both.

Rent the big rotary hammer and coring bit from a home center for your first several jobs before you buy one. Slab penetrations are typically a 4 inch to 5 inch cored hole, and you will know within a month whether your job volume justifies owning the rig.

What should the first 90 days of a radon mitigation business look like?

Weeks one and two are for certification and insurance. Weeks three to six are for inspector relationships and your first paid installs. Weeks seven to twelve are for repeatable weekly job volume.

The single most useful milestone in the first 90 days is not revenue, it is a passing post-mitigation retest on a paid job. That result is your proof of competence, your marketing asset, and the thing an inspector needs before sending you a second referral.

What mistakes kill new radon mitigation businesses?

The killers are undersized fans that fail the post install retest, skipping that retest entirely, working uncertified in a state that requires a credential, and carrying general liability without errors and omissions cover.

Almost every failure in this trade traces back to the same thing: treating radon like pipe fitting instead of like measurement. The pipe is easy. Proving the number came down is the job.

• Undersizing the fan. Putting a 4 inch RP145 on a house with tight clay soil when it needed the pressure of a GP501 means a failed retest and a free second trip.
• Skipping the post-mitigation retest to save a day. You have no proof the system works, no defense if the homeowner tests it themselves, and no referral.
• Bad stack termination. Ending the vent below the eave line or near an operable window is a standards violation and gets flagged by the next inspector who walks the house.
• Not sealing the sump pit, floor cracks and the slab perimeter. The fan then pulls conditioned air, the homeowner sees a heating bill spike, and you own that complaint.
• Working before your state credential clears in Florida, Iowa, Illinois, Kansas, Maine, Minnesota, Nebraska, New Jersey, Ohio or Pennsylvania.
• Forgetting per-system state fees. Pennsylvania charges $50 for every new mitigation system installed in the state, and that comes out of your margin if you never priced it in.
• Buying general liability only. A measurement dispute is an errors and omissions claim, and your GL policy will not respond to it.
• Quoting off the national $1,200 to $2,000 average without checking your own line costs. Your drive time, permit and retest costs are local, not national.
• Spending the marketing budget on homeowners. Homeowners do not know they have radon. Inspectors and agents do, and they decide who gets called.

Is a radon mitigation business worth it?

A solo installer averaging two systems a week at $1,400 grosses about $140,000 a year, though year one usually lands lower. Fan replacements and referral work build a repeat base on top.

Here is the honest first year math. Two installs a week at a $1,400 average is $2,800 a week and roughly $140,000 a year, but almost nobody hits two a week in month one. A more realistic first year for a solo operator starting with zero referral relationships is 50 to 90 systems, which is about $70,000 to $126,000 gross. Subtract insurance at $1,300 to $4,000, certification upkeep, fuel, and material that runs a few hundred dollars a job, and a working first year nets a solid trade income rather than a fortune.

The margin story is better than the revenue story. On a $1,500 job the price splits roughly into $525 piping and core drill, $375 fan and vent stack, $300 labor, $180 retest and permit, and $120 sealing and cladding. Your real out of pocket on that fan line is about $142 for an RP145C. The gap between what you allocate and what you actually spend is where a one truck shop makes its living, and it is why this trade is described as high-value with low equipment cost.

The ceiling with a crew is real but it takes capital. National Radon Defense, one of the named franchises in this space, asks a $39,000 franchise fee with $75,000 in liquid capital and $150,000 net worth, which is a fair signal of what a funded multi-truck operation actually costs to stand up. Independently, the path is the same shape: a second installer, a second stocked van, and a dispatcher so quotes go out the same day.

Two things make the demand durable. Radon testing is a routine part of real estate transactions in many states and has been increasing, and every fan you install is a $300 to $600 replacement job for you when it reaches end of life. Every commercial market estimate found projects mid to high single-digit annual growth, though the absolute market-size numbers those firms publish disagree with each other by an order of magnitude and are not worth quoting.

What does the seasonal calendar look like in radon mitigation?

Radon readings peak in winter when houses are closed up, so testing demand spikes around January, National Radon Action Month. Install volume peaks in the warmer months because it follows home sales.

This trade has a split season, and new owners get caught by it. The gas peaks in winter, when doors and windows stay shut, ventilation drops, and heating creates stack effect that pulls soil gas into the house. That is why winter is the best time to test, and why winter is when your phone rings with failed results.

Installation volume runs on a different clock. It tracks the home sale calendar, so it climbs through spring and peaks in the warmer months. Many contractors are visibly less busy in the coldest months, which is exactly when a new shop should be selling, not waiting. Use the slow weeks for fan replacement campaigns to your old customer list and for National Radon Action Month outreach.