​Requirements for a Radon Bid and Plan

ANSI/AARST mitigation standards require onsite diagnostics and a building investigation before a radon mitigation plan or bid can be developed.
​The requirements appear in the following sections of the 2023 ANSI/AARST mitigation standards:
​ANSI/AARST MAH‑2023 (Mitigation of Radon in Existing Homes)
  • Section 4.1 — Building Investigation
  • Section 4.2 — Diagnostics
  • Section 5.1 — System Design Requirements
ANSI/AARST SGM‑SF‑2023 (Soil Gas Mitigation for Existing Homes)
  • Section 4.1 — Building Investigation
  • Section 4.2 — Diagnostics
  • Section 5.1 — System Design Requirements
ANSI/AARST RMS‑LF‑2023 (Radon Mitigation Standards for Large Buildings & Schools)
  • Section 4.1 — Building Investigation
  • Section 4.2 — Diagnostics
  • Section 5.1 — System Design Requirements
These sections require contractors to evaluate the structure, identify entry points, and perform diagnostics in person. Remote or photo‑only bids cannot meet these requirements.