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Fannie Mae/Freddie Mac

Freddie Mac
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Who Needs Fannie Mae/Freddie Mac Radon Standards
 

As of 2023 Fannie Mae and Freddie Mac have the same radon testing standards for multifamily loans. All Fannie Mae and Freddie Mac multifamily mortgage loans require radon testing under these standards. Under these standards, multifamily housing is defined as properties with 5 or more residential units. 

Standards

  • 25% of ground floor units must be tested

  • At least one unit must be tested per building

  • Must be conducted by a certified professional

  • Tests must comply with all radon laws and regulations both federal and within the state of the property

  • Testing on upper floors is not required

  • Should a unit test over 4.0 pC/l, either mitigation or a second round of testing must be conducted

    • The second round of testing must be 25% of ground floor units, including those that tested over 4.0 pC/l​

    • Units tested twice with an average level over 4.0 pC/l must be mitgated

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