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Additions, alterations or repairs to any structure shall conform to the requirements for a new structure without requiring the existing structure to comply with the requirements of the IRC, unless otherwise stated. Additions, alterations or repairs and relocations shall not cause an existing structure to become unsafe or adversely affect the performance of the building.

Exceptions.

(1) Additions with less than 500 square feet of conditioned floor area are exempt from the requirements for Whole House Ventilation Systems, Section M1508.

(2) Additions or alterations to existing buildings which do not require the construction of foundations, crawlspaces, slabs or basements shall not be required to meet the requirements for radon protection in Section R327.1 and Appendix F. (Added by Amended Ord. 14-060, Aug. 27, 2014, Eff date Sept. 13, 2014; Amended by Ord. 17-057, Oct. 18, 2017, Eff date Nov. 9, 2017; Amended by Ord. 21-030, July 14, 2021, Eff date July 25, 2021).