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House Housing Committee backs ADU-protection amendment, unanimously advancing bill
Summary
The committee recommended HB 1079 ‘ought to pass as amended’ after adopting language clarifying that detached accessory structures converted to ADUs before July 1, 2025, qualify for seven-year protection from future zoning changes under RSA 674:39; the measure advanced on a 17-0 vote.
Representative Hallen told the full Housing Committee that the subcommittee met twice and agreed to an amendment clarifying how accessory dwelling unit (ADU) protections apply to detached structures built before July 1, 2025.
“The subcommittee met twice … this really drew a line in the sand. On 07/01/2025 legislation went in effect that you could have either an attached or detached ADU by right,” Representative Hallen said, summarizing the amendment’s purpose to shield qualifying detached structures from subsequent zoning changes.
The amendment adds an explicit cross-reference to RSA 674:39 to ensure a seven-year exemption from setback and lot-coverage changes for qualifying projects once a building permit has issued and substantial completion is demonstrated. Hallen said the change also prevents a municipality from treating conversions (for example, a garage turned into an ADU) as a change of use that would strip nonconforming protection.
Why it matters: The change preserves property owners’ expectations when they initiate construction and protects small-scale housing conversions that supporters say expand the supply of rental units. Representative Hallen emphasized that the amendment aligns ADU protections with an existing statute that already grants a seven-year shield for permitted development following permit issuance and substantial completion.
Committee action: Representative Hallen moved that the committee recommend HB 1,079 ‘ought to pass’ with amendment 0823h; Representative Aaron seconded. The clerk called the roll and the motion carried unanimously, 17 to 0. Representative Howland was assigned to write the committee report.
Background and context: Committee members noted this change clarifies an ambiguity that arose after last year’s ADU law (HB 577) took effect July 1, 2025. Supporters said the amendment helps owners who built detached accessory structures before zoning changes made those structures nonconforming; opponents raised no recorded objections during the executive session.
Next steps: The committee placed HB 1,079 on the consent calendar and advanced the measure to the next stage of the process.
