Contractor Quote Checklist
Radon Mitigation System Quote Checklist Before Approval
Short answer: approve a radon mitigation quote only after it ties the work to a specific test result, explains EPA action level context, names the mitigation approach and applicable standard, maps suction points, fan and vent routing, sealing, electrical scope, post-install testing, follow-up work, maintenance, and warranty response if levels remain high.
Radon mitigation is not just installing a fan. The system has to create reliable pressure under the home, vent soil gas outdoors, avoid unsafe discharge locations, and prove the radon level dropped after installation.
As of June 2026, EPA says homes should be fixed if radon is 4 pCi/L or more, and also recommends considering action between 2 and 4 pCi/L because no radon exposure level is known to be completely safe. Your quote should make that measurement context visible.
Start With The Test Basis
Ask which radon test the contractor used: date, device type, room, level, duration, closed-building conditions, and whether the result came from a real estate test, short-term test, long-term test, or follow-up test.
The quote should not say only “install radon system.” It should state the measured radon level and whether additional testing is recommended before or after work.
Ask Which Standard Applies
EPA’s Radon Standards of Practice page points to current ANSI/AARST standards for measurement and mitigation, including 2023 standards for homes and shared buildings. Ask the contractor which standard, state requirement, or local rule the job follows.
This matters because real estate, multifamily, school, commercial, and single-family work can have different measurement and documentation requirements.
Match Design To Foundation Type
The quote should identify the proposed method: active sub-slab depressurization, drain-tile suction, sump suction, block-wall suction, crawlspace membrane depressurization, or a combined approach.
Finished basements, slab additions, crawl spaces, sump pits, tight soils, and multiple foundation areas can change the number of suction points and pipe routes.
Map Suction Points Before Approval
Ask where each suction point will be drilled or connected, how the contractor selected those locations, and what happens if diagnostic testing shows weak communication under the slab.
A quote that hides suction point locations until installation day makes it hard to compare designs, patching, noise, and finished-space disruption.
Specify Fan, Vent, And Discharge Location
The estimate should show fan location, pipe route, discharge point, pipe size, exterior appearance, roof or wall penetrations, service access, noise expectations, and weather protection.
CDC describes the common soil depressurization system as a vent pipe and fan that pulls radon from beneath the house and vents it outside. The quote should show exactly where that system will sit on your house.
List Sealing And Electrical Scope Separately
Sealing can include cracks, slab openings, sump covers, crawlspace membrane seams, utility penetrations, and basement wall gaps. The quote should say what is included and what is cosmetic or excluded.
Electrical work should name the circuit, switch, outlet, disconnect, permit, and who performs the work. A radon fan needs reliable power and serviceable installation.
Make Post-Install Testing Mandatory
The quote should state who performs the post-install test, when it happens, what device or method is used, what result target is expected, and what the contractor does if levels remain elevated.
EPA’s Consumer’s Guide to Radon Reduction is written for people who have confirmed elevated levels and need to select a contractor, choose a reduction method, and maintain the system. Retesting and maintenance should not be afterthoughts.
Review Warranty And Maintenance
Ask whether the warranty covers the fan, workmanship, pipe routing, electrical connection, sealing, retesting, and additional suction points if the first design does not hit the target.
Also ask what voids the warranty: power outage, fan unplugged, home additions, sump changes, finished basement changes, inaccessible crawlspace, or homeowner-altered pipe routing.
Radon Mitigation Quote Review Table
| Quote area | What to confirm | Why it matters |
|---|---|---|
| Test basis | Level, date, location, device, duration, follow-up need | The design should respond to measured radon. |
| Standard | EPA-referenced ANSI/AARST standard, state rules, local permits | Documentation requirements can vary by property type. |
| Design | Mitigation method, foundation areas, suction points, diagnostics | Foundation conditions drive system layout. |
| Installation | Fan, vent route, discharge, sealing, electrical, access | Routing affects noise, service, appearance, and performance. |
| Verification | Post-install test, target, report, follow-up if high | Mitigation is not complete until the result is verified. |
Questions To Ask Before Approval
- What exact radon test result is the quote based on?
- Does the result meet EPA’s 4 pCi/L fix recommendation, or fall in the 2 to 4 pCi/L consider-fixing range?
- Which mitigation standard, state rule, or local requirement will the installer follow?
- Which mitigation method is proposed for each foundation area?
- Where will suction points, fan, pipe route, discharge, and manometer be located?
- What sealing and electrical work are included?
- Who performs post-install testing, and what happens if levels remain high?
- What maintenance and warranty conditions are the homeowner responsible for?
Red Flags In This Quote
The contractor quotes a fan without tying the design to the measured radon level, foundation type, or suction point plan.
The quote promises a result but does not include post-install testing or follow-up work if the level stays high.
Fan placement, vent discharge, electrical work, permits, and sealing are described as “as needed” without pricing or responsibility.
Source Links
- EPA: Radon Action Level
- EPA: Radon Standards Of Practice
- EPA: Consumer’s Guide To Radon Reduction
- CDC: Reducing Radon Levels In Your Home
- FTC: How To Avoid A Home Improvement Scam
FAQ
What radon level should trigger a mitigation quote?
EPA recommends fixing homes at 4 pCi/L or more and considering action between 2 and 4 pCi/L. The quote should cite the actual test result.
Is sealing alone enough for radon?
Usually sealing supports a mitigation system, but the quote should explain the primary method, such as active soil depressurization, and how sealing supports it.
Who should do post-install testing?
The quote should say who tests, when the test happens, what method is used, and what the contractor does if radon remains elevated.
Can the radon fan be placed anywhere?
No. The fan, vent route, discharge, electrical connection, noise, weather protection, and service access should be specified before approval.
What is the biggest approval risk?
The biggest risk is approving a fan installation without test basis, system design, applicable standard, sealing scope, and post-install verification.
Internal Link Candidates
- Crawl space encapsulation quote checklist
- Basement waterproofing quote checklist before approval
- Electrical panel upgrade quote checklist before signing
Before approval, make the contractor write down the test basis, EPA action-level context, mitigation standard, suction design, fan route, sealing, retesting, and warranty response.