St. Louis Metro · Missouri & Illinois

Radon Testing for Home Inspections

IEMA-Certified NRPP-Certified BBB A-Rated Results in 2-3 Business Days

Radon testing for home inspections gives buyers and sellers a documented reading inside the inspection window.

We place continuous radon monitors under EPA closed-house conditions and return a report you can put straight into the transaction file.

Results come back in two to three business days.

Call 314-664-9807 Get a Free In-Home Estimate

IEMA License #RNM20232346 Free Written Estimates 24-Hour Availability

What Your Number Means

EPA action level4.0 pCi/L

Below action level< 4.0 pCi/L

At or above 4.0 pCi/L the EPA recommends mitigation. Below it, no action is required.

Built to perform

The Transaction

Radon Testing During a Real Estate Transaction

Radon usually comes up during the inspection period, when there is a fixed window to get answers.

A reading at or above 4.0 pCi/L is the EPA action level and commonly triggers a repair request or a credit. Having the number early gives both sides room to negotiate.

Protocol

Closed-House Conditions Explained

A valid short-term test requires closed-house conditions, starting twelve hours before the test and continuing throughout.

Keep windows and exterior doors closed
Run heating and cooling systems normally
Do not run whole-house fans or window units that draw outside air
Leave the monitor undisturbed where we place it

Placement

Where We Place the Monitor

The device goes in the lowest livable level of the home, away from drafts, exterior walls, and direct sun.

Placement affects the result, which is one reason a professional test carries more weight in a transaction than a hardware-store canister.

Deliverable

What the Report Includes

The average radon level in pCi/L
Hourly readings across the full test period
Placement location and test conditions
Certification details for your file

Existing Systems

When the House Already Has a Mitigation System

A system on the house does not by itself prove the radon level is low.

Systems age and fans fail, and a seller may not know when anyone last tested. Check the manometer on the vent pipe, then test.

Scheduling

Timing Around Your Inspection Window

Tell us your deadline when you call.

If the result requires mitigation and the closing date is fixed, that sequence gets tight quickly, so it is worth starting the test in the first days of the window.

In the Field

Where Monitors Go

Clean unfinished basement with bare concrete walls and floor in a St. Louis area home, the lowest lived-in level where radon is tested

Small radon test monitor placed on the floor of a finished St. Louis home basement

Get Your Number

Inspection deadline coming up?

Give us the address and the deadline and we will confirm timing.

Call 314-664-9807