After telling municipal officials that a “sober house” on West Road may operate without a permit in a residential zone, the town attorney is advising the volunteer body that will hear an appeal of that decision to uphold it. New Canaan must grant a “reasonable accommodation” under the federal Americans with Disabilities Act to the sober house “and cannot discriminate against handicapped or disabled persons,” town attorney Ira Bloom said in a letter filed Thursday with Planning & Zoning. “Even when the sober house reaches capacity of six or perhaps eight from time to time, the ADA requires a reasonable accommodation that would allow for such occupancy,” Bloom said in the letter. “[Town Planner] Mr. [Steve] Palmer has been working diligently with the proprietor of the sober house to craft a set of conditions for its ongoing operation, including provisions for inspections, reporting and supervision. His goal is to have such conditions become part of the official record—perhaps even part of the [Zoning Board of Appeals’] decision after the March 6 hearing.