Section 102.5 of the International Fire Code is hereby amended to read as follows:

102.5 Where structures are designed and constructed in accordance with the International Residential Code, the provisions of this code shall apply as follows:

1. Construction and design provisions of this code pertaining to the exterior of the structure shall apply including, but not limited to, premises identification, fire apparatus access and water supplies. Where interior or exterior systems or devices are installed, construction permits required by Section 105.7 of this code shall apply.

Exception: Additions to existing structures of up to 500 square feet for other than adult family homes are not required to comply with fire apparatus access or water supply requirements.

For other than adult family homes, additions greater than 500 square feet are allowed, provided the following criteria are met:

1. When there is inadequate fire department access (Section 503), distance to fire hydrants and/or inadequate fire flow (Section 507) and a proposed addition to a dwelling is less than 25% of the existing total living area square footage, interconnected carbon monoxide and smoke alarm devices shall be installed in accordance with Section 907.2.11.2 and International Residential Code Section 315.1 throughout the dwelling.

2. When there is inadequate fire department access (Section 503), distance to fire hydrants and/or inadequate fire flow (Section 507) and a proposed addition to a dwelling is greater than 25% but less than 50% of the existing total living area, interconnected carbon monoxide and smoke alarm devices* shall be installed in accordance with Section 907.2.11.2 and the International Residential Code Section 315.1 standards throughout the dwelling and monitored by an approved central station provided there is a minimum available fire flow of 1,000 G.P.M. If the available fire flow is less than 1,000 G.P.M., item #3 shall apply.

3. When there is inadequate fire department access (Section 503), distance to fire hydrants and/or inadequate fire flow (Section 507) and a proposed addition to a dwelling is greater than 50% of the existing total living area an automatic fire sprinkler system installed in accordance with NFPA standard 13D standard shall be installed throughout the dwelling.

*UL 217 listed wireless devices are approved for installation.

2. Administrative, operational and maintenance provisions of this code shall apply.