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9.6.3.5 Requirements for New Construction

HUD Multifamily Accelerated Processing (MAP) Guide, HUD Handbook 4430.G (2020 ed., rev. Mar. 19, 2021) · 2026 edition · updated 2026-10-05 · United States

  • A. All new construction projects must follow radon resistant construction requirements.

  1. Multifamily structures reference ANSI-AARST CC-1000-2018, Soil Gas Control Systems in New Construction of Buildings.

  2. Single Family structures reference ANSI-AARST CCAH-2020, Reducing Radon in New Construction of 1 & 2 Family Dwellings and Townhouses.

B. Post-construction testing is required prior to final completion inspection. If post-construction testing results are above the threshold, the project must be brought into compliance by activating the mitigation system or through retrofit mitigation.

C. All testing and mitigation required as a result of this testing must be performed by, or under the direct supervision of a Radon Professional, in accordance with the protocols referenced in this section.

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▸Contents — HUD Multifamily Accelerated Processing (MAP) Guide, HUD Handbook 4430.G (2020 ed., rev. Mar. 19, 2021)
HUD Multifamily Accelerated Processing (MAP) Guide, HUD Handbook 4430.G (2020 ed., rev. Mar. 19, 2021)

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