What is the effective date referred to in the context of building code changes?

The effective date in the context of building code changes refers to the date when the legislation takes effect. This date is crucial because it marks the point at which any new regulations or amendments within the building code become enforceable. After this effective date, all construction projects and related activities must comply with the updated code requirements. Thus, understanding this date is essential for designers, builders, and all stakeholders in the construction industry to ensure that they are operating within the legal framework established by the new code.

In contrast, the other options refer to different aspects: the date of the last revision pertains to when existing codes were last updated but does not indicate when the new changes come into force. The date the examination is scheduled is unrelated to the effective date of the building code and pertains instead to the timing of assessments for individuals seeking certification or licensure. The date of initial commonly accepted practices relates to historical norms in construction but does not have a bearing on the current regulatory framework established by the updated code.