Evidence satisfactory to the board of the completion in each 2-year renewal period of a minimum of 20 hours of continuing education shall be required for license renewal, provided that one hour of the 20 required hours shall be from a board-approved course on appropriate building regulations including any recent revisions to regulations. The board shall approve educational courses and activities that would further the professional competence of licensees. The continuing education credits shall be determined on the basis of one credit for each contact hour of course instruction or professional development activity actually attended by a licensee.