(Added by Ordinance No. 169427; amended by 178831, effective November 20,
2004). When an alteration for which a building permit is required has a value
(not including costs of mechanical, electrical, plumbing, permanent equipment,
painting, fire extinguishing systems, site improvements, eco-roofs and finish
works) of more than $175,000, an ASCE 31 evaluation is required. This value of
$175,000 shall be modified each year after 2004 by the percent change in the R.S
Means Construction Index for Portland on file with the Director. A letter of
intent to have an ASCE 31 evaluation performed may be submitted along with the
permit application. The evaluation must be completed before any future permits
will be issued. The following shall be exempted from this requirement:
A. Buildings constructed or renovated to seismic zone 2, 2b
or 3 under a permit issued after January 1, 1974.
B. Detached One- and two-family dwellings, and their
C. Single story, light frame metal and light wood frame
buildings, not more than 20 feet in height from the top surface of the lowest
floor to the highest interior overhead finish and ground area of 4,000 square
feet or less.
A previously prepared seismic study may be submitted for consideration by the
Director as equivalent to an ASCE 31 evaluation.