The McGill M.Arch. (Professional) degree is accredited by the Canadian Architectural Certification Board (CACB), and is recognized as accredited by the National Council of Architectural Registration Boards (NCARB) in the USA.
From the Accreditation webpage of the Canadian Architectural Certification Board (CACB):
Accreditation is the public recognition accorded to a professional program that meets established professional qualifications and educational standards through initial and periodic evaluations.
Accreditation is based on the Conditions and Terms for Accreditation and the Procedures for Accreditation established by the CACB. It typically requires a self-evaluation on the part of the institution, followed by a site visit and review conducted by a team representing the CACB.
The Accreditation Decision is rendered by the Board.
The CACB Conditions and Terms for Accreditation and the Procedures for Accreditation are cyclically reviewed and updated to ensure that architectural education is adapting and anticipating changes in the discipline and in the profession.
The CACB has administered the Accreditation Program since 1991. It is the sole organization recognized by the architectural profession in Canada to accredit professional degree programs in architecture offered by Canadian Universities.
The CACB is one of the founders and an active member of the Association of Accrediting Agencies of Canada (AAAC).