According to CSI and standard General Conditions (such as AIA A201 and EJCDC C-700, both referenced in CSI’s CDT materials), the contractor has a duty to review the contract documents for coordination and constructability, and if any errors, inconsistencies, or code violations are discovered, the contractor must promptly notify the architect/engineer (A/E) in writing before proceeding.

This requirement exists because:

The A/E is responsible for design compliance with codes.

The contractor must not proceed with work known to be contrary to applicable laws or regulations without clarification.

The contractor’s written notice triggers the A/E’s responsibility to issue clarification, correction, or instruction to maintain compliance.

Therefore, the proper action is Option A — Notify the architect/engineer in writing.

Why others are incorrect:

B. Proceed with the work – would expose both the contractor and owner to risk of code violation; explicitly prohibited by standard conditions.

C. Request a variance – is not the contractor’s responsibility; this rests with the owner or A/E.

D. Stop all work – not authorized unless directed; the contractor must first notify the A/E.

CSI Reference:

CSI Project Delivery Practice Guide, “Construction Phase — Communications and Responsibilities”; Construction Specifications Practice Guide, “General Conditions Responsibilities — Compliance with Codes.”