Portland's general noise ordinance (Chapter 17) and the state disorderly-conduct statute (17-A MRS § 501-A) apply to short-term rental guests with no STR-specific noise carve-out. STR operators are responsible for ensuring guests comply with quiet hours and decibel limits.
Portland Code of Ordinances Chapter 17 sets the citywide noise standards, including a 10:00 p.m.–7:00 a.m. quiet period during which permissible sound levels are reduced by 5 dBA from daytime limits. Construction or other activity producing more than 50 decibels is prohibited between 7:00 p.m. and 7:00 a.m. within 500 feet of any residential, hospital, or nursing-home building (extended to 8:00 p.m. June 1–August 31), and no construction may begin before 8:00 a.m. on weekends or legal holidays. Layered on top, 17-A MRS § 501-A (disorderly conduct, Class E crime) reaches loud and unreasonable noise in a public place — including from consumer fireworks — and excessive noise in a private place after a law-enforcement order to cease. STR-specific obligation: Portland Code §§ 6-200 et seq. (Disorderly Houses) holds owners, agents, and operators responsible for maintaining the property in compliance with state and local law, which is explicitly cross-referenced in the city's Landlord Statement of Permission form. Repeated guest noise violations can be grounds for STR registration revocation.
Civil noise-ordinance violations under Chapter 17 typically draw a written warning, then escalating civil penalties under 30-A MRS § 4452 ($100–$2,500/day). Class E disorderly-conduct charges under 17-A MRS § 501-A carry up to 6 months in jail and a $1,000 fine. Repeated violations at an STR property are an enumerated basis for STR registration revocation or non-renewal under Chapter 6 and Portland's disorderly-house code §§ 6-200 et seq.
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