Multifamily vs SF
Multifamily vs single-family radon testing
August 19, 2026
Is multifamily radon testing the same as a single-family home test?
No. A single-family test is usually one building, one HVAC story, and a short device list. Multifamily work is a sampling plan across units, floors, and buildings, with closed-building conditions and a report written for a lender file. Using a home-inspector kit on a 120-unit asset is how deal teams get a number that will not survive MAP or Agency review.
NOI Radon is built for multifamily owners, property managers, lenders, and brokers. Single-family requests are outside the primary focus. Mixed portfolios can still use the quote form.
Why does unit count change the protocol?
Device count and placement follow multifamily guidance, not a one-kit-per-address habit. Ground-contact units, different foundations, and separate buildings all change coverage. The plan has to be defensible when a reviewer asks why unit 12 was tested and unit 14 was not. That is a sampling question, not a sales question.
What do lenders actually reject when someone uses a single-family shortcut?
They reject missing protocol, missing coverage, and reports that look like a lab printout from a basement. They also reject surprise change orders after devices are already in units. A multifamily job that was bid like a house will miss floors, miss buildings, or miss closed-building conditions. Then the closing calendar eats the delay.
How should a property manager prepare the site?
Resident notice, unit access, and HVAC left in a normal occupied setting with windows closed for the test window. Staff should not "air out" units the night before to be helpful. Placement should be quick. Long disruptions are a site problem, not a badge of thoroughness. NOI Radon coordinates directly with on-site staff so the test week stays manageable.
| Topic | Single-family habit | Multifamily diligence |
|---|---|---|
| Scope | One address, few devices | Buildings, floors, and a sampling plan |
| Protocol | Home measurement shortcuts | ANSI/AARST multifamily guidance |
| Report | Lab sheet to the owner | Lender-ready diligence write-up |
| Elevated results | Owner shops a mitigator | Bids via local partners, reviewed for program fit |
| Scheduling | One visit | Nationwide placement around a closing date |
When is a mixed portfolio still in scope?
If the live deal is multifamily, send that property. If a package also has a house, ask in the quote. Do not assume the apartment protocol applies to the house, or the other way around. The quote should name the asset type so the fee matches the work.
Send the multifamily address, units, program, and deadline through the quote form.