Which type of documentation is a LOA (Letter of Assurance) in WELL practices?

• A. Annotated Documents
• B. General Documentation
• C. Letters of Assurance (LOA) from architect, contractor, or engineer.
• D. Performance Verification

Answer: (C)

In WELL practice, a Letter of Assurance is a formal attestation from the responsible professionals—typically the architect, contractor, or engineer—that the project design and construction align with the WELL requirements and that the necessary verifications or commissioning steps have been completed. This document provides accountable sign-off from those who designed or built the space, showing that the stated criteria are addressed before certification review. It’s distinct from general or annotated documentation, which are notes or background materials, and from performance verification, which involves actual testing and measurement of outcomes after construction. The LOA thus acts as a professional endorsement that the project team has fulfilled the specified WELL criteria for the relevant features.