DEERFIELD — After the Selectboard and Planning Board endorsed the changes, Special Town Meeting voters are slated to consider revisions to the town’s bylaws regulating accessory dwelling units (ADUs) this fall in accordance with state guidelines. Besides changing the term “accessory apartments” to “accessory dwelling units” in the bylaw, the Planning Board is proposing a few other switches. At the public hearing on the proposed changes on Monday night, Planning Board Chair Denise Mason described the shifts as not “earth-shattering.” The new bylaw would instead allow ADUs above 900 square feet or half the primary dwelling size and below 1,200 square feet by special permit. Mason told the Selectboard at its July 22 meeting that the last ADU building permit that the Planning Board reviewed came in about two years ago.