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Acton staff recommend larger by-right expansion or square-foot cap to ease ZBA burden
Summary
Planning staff reported a 98% ZBA approval rate for nonconforming-lot expansion requests since 2012 and proposed raising the by-right cap (40''50%) or switching to a square-foot cap; the boards favored a square-foot or footprint exemption approach with continued public-notice protections.
Planning staff presented findings that since the town adopted a 15% by-right cap for additions on nonconforming lots in 2012 the Zoning Board of Appeals has reviewed 56 applications and approved 53 in full. Staff said the median granted increase has been about 38% (approximately 1,000 square feet), and that a percent-based cap can disproportionately limit homeowners on small lots.
Staff proposed three policy options: raise the by-right percentage to 40% or 50% (to align with what the ZBA commonly approves), replace a percentage cap with a square-foot limit to reduce disproportionate impacts on small houses, or add an exemption allowing upward additions that remain within the existing footprint. They also proposed adding a special-permit pathway for commercial structures on nonconforming lots.
Board members and public commenters expressed concern about neighborhood character and the need to retain abutter notice and public hearings for larger changes. Several members favored a square-foot cap or the footprint-upward exemption and asked staff to include safeguards against successive, repeated increases (for example, tracking additions to the adoption date or limiting the number of by-right increases).
Next steps: planning staff will draft concrete bylaw language with square-foot thresholds and notification language and return to the boards for further review.
