From section 8.24.010 of St. Helena Municipal Code
B. Between the hours of 10 p.m. and 7 a.m. next ensuing, no commercial or other activity shall be conducted upon any privately owned real property within the City which activity creates noise which can be heard at the property line of any parcel of real property within the city, unless a permit shall first have been secured from the Chief of Police.
C. Notwithstanding the provisions of subsection B of this section, activities associated with commercial and residential construction projects by contracted services shall be regulated as follows:
1. Monday through Saturday. Construction activities which generate noise that can be heard at the property line of any parcel of real property within the City limits shall be limited to 8 a.m. to 5 p.m. Delivery of materials/equipment and cleaning and servicing of machines/equipment shall be limited to 7 a.m. to 6 p.m. Exceptions to these time restrictions may be granted by the public works director for one of the following reasons: (a) inclement weather affecting work; (b) emergency work; or (c) other work, if work and equipment will not create noise that may be unreasonably offensive to neighbors as to constitute a nuisance. The City engineer must be notified and give approval in advance of such work.
2. Sundays and Holidays (Federal and Local). No construction activities allowed which generate noise that can be heard at the property line of any parcel of real property within the City limits.