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City of Portland

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24.85.060 Required Seismic Evaluation.

(Added by Ordinance No. 169427; amended by Ordinance Nos. 178831 and 187192, effective July 17, 2015).  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 41 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 41 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 accessory structures.

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 41 evaluation.