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Architect frames rear addition and octagonal turret at 20 Bank Street; commission asks for material details

Groton Historic District Commission · August 5, 2026
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Summary

An architect presented a plan to add living space and an octagonal turret at 20 Bank Street to improve circulation and views; commissioners generally supported the concept but asked for final materials and precedent images to ensure compatibility with the historic district.

Architect Chris Vernot presented a pre-application for 20 Bank Street proposing a rear addition that pulls out nine-plus feet at the basement walkout level, adds a first-floor deck, and introduces an octagonal turret to resolve interior stair circulation. Vernot said the design would match the house’s existing trim and shingle details and use narrow iron spindles in railings to preserve water views.

Vernot said the turret was inspired by existing octagonal elements in the district and would use matching fish-scale shingles and trim; commissioners praised the idea for adding rhythm to the roofline but asked for refined material lists and final rail and trim details. "A turret or tower actually became a great solution," Vernot said when explaining why the design resolved access between levels. The commission requested finalized materials and additional renderings before formal submission.