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An existing building or structure may be increased in height or area up to the limits imposed by Chapter 13-48.
(a) When the floor area is increased by not more than 25 percent of the original building, only the new construction need conform to all requirements of this Code for new construction. When the floor area is increased by more than 25 percent of the original building, the entire building shall conform to all requirements of this Code.
(b) Where a fire wall complying with Chapter 15-8 is provided which separates the addition from the existing building, only the new construction need conform to all requirements of this Code for new construction, regardless of the percentage increase in area created by the addition. Such an addition with the required fire wall separation, may also be considered a separate building if on a separate lot.
(c) No addition shall impose exiting loads which exceed the capacity of the existing building exits without provision of additional exits, in conformance with Section 13-200-330 through and including 13-200-360 of this chapter for the existing building or Chapter 13-160 for the addition.
(d) No addition shall impose structural loads, either vertical or horizontal, which would cause the existing building to be subjected to stresses exceeding those permitted by the new construction. Any increase in floor or roof loading shall be investigated to determine the adequacy of the existing floor system to support the increased loads. If the existing floor system is found to be inadequate, it shall be modified to support the increased loads.
(Prior code § 78.1-24; Amend Coun. J. 2-13-85, p. 13525)