Radon work at building scale
Buildings test and mitigate differently than houses — more test points, more coordination, and documentation someone has to report against.
Who this work is for
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Apartment and multifamily buildings
Ground-contact units tested in place, mitigation scoped by section rather than by door.
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Offices and retail
Occupied-hours testing and systems planned around tenants and HVAC schedules.
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Schools and childcare
Programs that test on a schedule and need results in a reportable format.
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Property portfolios
A consistent testing and documentation approach across multiple addresses.
Buildings aren’t big houses
Radon in a Sioux Falls commercial or multifamily building is the same gas doing the same thing: rising from the soil into ground-contact space. Everything else scales.
A house is one test in one basement. A building is a grid of test points across ground-floor units, offices, and below-grade rooms, run on a documented plan, because slab sections and soil pockets make radon patchy at scale. One end of a building can read triple the other.
The coordination scales too. Devices go into occupied apartments and working offices, which means notice to tenants, access windows, and closed-building conditions that someone has to actually manage.
And unlike most homeowners, the people who order this work usually answer to someone. Property managers report to owners. Boards report to members. School and childcare operators report to agencies and parents. Multifamily deals with federal financing often come with radon testing requirements attached. The output that matters isn’t a number on a sticky note. It’s documentation that holds up when it’s forwarded. For context on how this region tests overall, radon levels in your area covers the published data.
Paper a manager can actually use
Building-scale work is worth doing in a form that survives a budget meeting.
The assessment stage produces a testing plan and per-location results: which spaces were tested, with what device, over what window, and what each read against the EPA action level of 4 picocuries per liter. That format lets an owner see the building’s radon picture at a glance and lets a manager file it against whatever program or lender asked.
When results call for mitigation, planning happens at the same altitude. Systems get scoped by foundation section, with the affected spaces named, so the work can be phased and budgeted rather than swallowed whole. After installation, retesting the affected locations documents that levels came down. That’s the sheet the file needs.
One honest boundary: no contractor can promise a building will satisfy a particular agency, lender, or program, because acceptance criteria belong to those bodies and they vary. Some jurisdictions and financing programs mandate testing on a schedule; the published local picture lives in the area radon data guide. What the work here can promise is measured results, a documented scope, and retest numbers — the raw material every one of those reviews asks for.
Managing a building? Start with an assessment you can plan around
Frequently Asked Questions
How does testing a building differ from testing a house?
Scale and placement. A house needs one device in the lowest lived-in level. A building needs devices across ground-contact rooms and units, placed and logged to a written plan, because one corner can read high while the rest reads low.
What does the documentation look like?
Typically a testing plan, per-location results, and — where mitigation happens — the system scope and post-installation retest numbers. What a given lender, agency, or program accepts varies, so the reporting format is worth confirming up front.
How is multifamily mitigation usually scoped?
By foundation section, not by unit count. A building on three slab pours might need three suction zones no matter how many apartments sit above them. That's why budgets start with an assessment of the structure rather than a per-door estimate.