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Commission approves 750 sq ft accessory dwelling at 537 Airline Road; requires corrected elevation labels

Dennis Old Kings Highway Regional Historic District Commission · May 13, 2026
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Summary

The commission approved a detached 750-square-foot accessory dwelling unit at 537 Airline Road with a condition that the applicant submit corrected elevation notations to match the site plan; an abutter raised concerns about septic and shared foundation, which the board said fall to other town departments.

The Dennis Old Kings Highway Regional Historic District Commission approved an application for a detached accessory dwelling unit at 537 Airline Road, with a condition requiring corrected plan notation.

Jeremy McAdam of Backyard ADUs presented the proposal, describing a roughly 750-square-foot single-story unit sited to the rear and subordinate in scale to the primary 1976 house. McAdam said the primary dwelling is not on the historic register and the ADU would not be visible from the main road.

An abutter, Sharon, raised specific concerns about potential impacts to a shared septic system, roof and foundation and asked for an engineer’s report: “I would really love to see an engineer's report and what the impact on the property would be, including my septic, my roof, my foundation.” The commission and the applicant responded that those structural and septic issues fall under the building and zoning departments and are outside the historic commission’s purview.

The commission asked the applicant to correct elevation notations on the submitted drawings so the front and rear are labeled consistently with the site plan; the board approved the application conditioned on receipt of those corrected drawings. The applicant noted he will provide a certified plot plan and stamped architectural drawings for the record and acknowledged an upcoming ZBA review for zoning questions.

Next steps: applicant to upload revised elevations and the certified plot plan; the commission’s approval allows the applicant to pursue building permits once documentation is complete.