Planning Radon Mitigation During a Michigan Real-Estate Transaction

The short answer

Start with the complete system and the evidence

Buyers, sellers, real-estate professionals, inspectors, and contractors may all be working against the same date, but they do not hold the same responsibility. The transaction should identify the test record, access authority, proposed system, installation scope, electrical and building-system coordination, retest plan, documents required by the parties, and the person responsible for each decision.

What Sandison evaluates

A practical path from symptoms to the right scope

Confirm the test record, access permission, and transaction timeline
Design around the actual foundation, suction zones, and occupied spaces
Coordinate fan power, routing, drainage, and penetrations before work
Plan post-mitigation testing and transfer the system documentation

System before schedule

The foundation and route determine the mitigation plan

A basement, slab-on-grade section, crawlspace, addition, sump condition, or divided foundation can change the number and location of suction points and the route available for piping. Fan position, discharge location, weather exposure, service access, noise, electrical supply, condensate behavior, visible labels, and the manometer all belong in the design discussion. Sandison’s NRPP-certified mitigation work can be coordinated with licensed plumbing responsibility and applicable electrical work, reducing handoffs where systems meet while preserving the distinct permit, inspection, and testing roles.

Verification and documents

Installation is a milestone; a valid post-mitigation measurement verifies performance

The parties should agree who provides access, who authorizes the work, when closed-building conditions begin, which test method is used, and how the result is delivered. The system record should identify the installed components, routing, fan and electrical information, operating indicator, labels, warranty or maintenance terms, and any areas or conditions outside the scope. Post-mitigation testing evaluates the completed system under the applicable test conditions; neither the contractor nor the website should promise a particular closing outcome or replace the advice of inspectors, agents, attorneys, lenders, or other transaction professionals.

Primary references

Verify the local and credential information.

U.S. EPA — radon mitigation and testing guidance

Common questions

What property owners ask

Should a radon mitigation system be tested after installation?

Yes. Post-mitigation testing verifies the measured radon level after the system is operating. Follow the test-device and qualified-professional instructions for timing and closed-building conditions.

Can radon mitigation require electrical or plumbing coordination?

It can. Fan power, routing, condensate, sump conditions, and foundation penetrations can cross trade boundaries, which is why the complete system should be reviewed before installation.

Evidence and review

Why this page can be trusted

Original Sandison field article with a primary technical reference, named author and qualified trade review, explicit safety and scope limits, and a separate evergreen decision-guide path.

Author and qualified trade reviewer: James Sandison, B.S. Mechanical Engineering, Oakland University. Michigan Mechanical License 7115733 · Michigan Master Plumber 8112263 · Michigan Plumbing Contractor 800-3618. Last reviewed 2026-08-29.