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The provisions of this chapter shall control the alteration, repair, addition and change of occupancy of existing buildings and structures. When a section is identified to apply, the subsections to that section also apply.
Additions, alterations, or repairs to an existing building, building system or portion thereof shall comply with Section C502, C503 or C504. Unaltered portions of the existing building or building supply system shall not be required to comply with this code.
Except as specified in this chapter, this code shall not be used to require the removal, alteration or abandonment of, nor prevent the continued use and maintenance of, an existing building or building system lawfully in existence at the time of adoption of this code.
Alterations, repairs, additions and changes of occupancy to, or relocation of, existing buildings and structures shall comply with the provisions for alterations, repairs, additions and changes of occupancy or relocation, respectively, in the International Building Code, International Fire Code, International Fuel Gas Code, International Mechanical Code, International Plumbing Code, North Carolina Existing Building Code and NFPA 70.
Except as otherwise required or permitted by this code, materials permitted by the applicable code for new construction shall be used. Like materials shall be permitted for repairs, provided hazards to life, health or property are not created. Hazardous materials shall not be used where the code for new construction would not permit use of these materials in buildings of similar occupancy, purpose and location.
No provisions of this code relating to the construction, repair, alteration, restoration and movement of structures, and change of occupancy shall be mandatory for historic buildings.
Additions to an existing building, building system or portion thereof shall conform to the provisions of this code as those provisions relate to new construction without requiring the unaltered portion of the existing building or building system to comply with this code. Additions shall not create an unsafe or hazardous condition or overload existing building systems. An addition shall be deemed to comply with this code if the addition alone complies or if the existing building and addition comply with this code as a single building. Additions shall comply with Section C502.2.

Exception: Additions complying with ANSI/ASHRAE/IESNA 90.1.
Additions shall comply with Sections C502.2.1 through C502.2.7.
New vertical fenestration area that results in a total building fenestration area less than or equal to that specified in Section C402.4.1 shall comply with Section C402.4. Additions with vertical fenestration that result in a total building fenestration area greater than Section C402.4.1 or additions that exceed the fenestration area greater than Section C402.4.1 shall comply with Section C407.
New skylight area that results in a total building fenestration area less than or equal to that specified in Section C402.4.1 shall comply with Section C402.4. Additions with skylight area that result in a total building skylight area greater than C402.4.1 or additions that exceed the skylight area shall comply with Section C407.
New mechanical systems and equipment that are part of the addition and serve the building heating, cooling and ventilation needs shall comply with Section C403.
New service water-heating equipment, controls and service water heating piping shall comply with Section C404.
New pools and inground permanently installed spas shall comply with Section C404.9.
New lighting systems that are installed as part of the addition shall comply with Section C405.
The total interior lighting power for the addition shall comply with Section C405.4.2 for the addition alone, or the existing building and the addition shall comply as a single building.
The total exterior lighting power for the addition shall comply with Section C405.5.1 for the addition alone, or the existing building and the addition shall comply as a single building.
New building envelope assemblies that are part of the addition shall comply with Sections C402.1 through C402.5.
Alterations to an existing building, building system or portion thereof shall conform to the provisions of this code as those provisions relate to new construction without requiring the unaltered portions of the existing building or building system to comply with this code. Alterations shall not create an unsafe or hazardous condition or overload existing building systems.

Exceptions:
  1. Alterations complying with ANSI/ASHRAE/IESNA 90.1.
  2. The following alterations to conditioned spaces need not comply with the requirements for new construction:
    1. Storm windows installed over existing fenestration.
    2. Surface-applied window film installed on existing single-pane fenestration assemblies reducing solar heat gain.
    3. Existing ceiling, wall or floor cavities exposed during construction, provided that these cavities are filled with insulation. Roof systems requiring air space for ventilation shall retain the ventilation space required.
    4. Construction where the existing roof, wall or floor cavity is not exposed.
    5. Roof recover and roof replacement such that the existing building or structure is no less conforming to the provisions of this code than the existing building or structure was prior to the alteration.
    6. Air barriers shall not be required for roof recover and roof replacement where the alterations or renovations to the building do not include alterations, renovations or repairs to the remainder of the building envelope.
    7. Alterations that replace less than 50 percent of the luminaires in a space, provided that such alterations do not increase the installed interior lighting power.
    8. Replacement of existing doors that separate conditioned space from the exterior shall not require the installation of a vestibule or revolving door, provided, however, that an existing vestibule that separates a conditioned space from the exterior shall not be removed.
Where an entire existing fenestration unit is replaced with a new fenestration product, including frame, sash and glazing, the replacement fenestration unit shall meet the applicable requirements for U-factor and SHGC in Table C402.4.

Exceptions:
  1. An area-weighted average of the U-factor of replacement fenestration products being installed in the building for each fenestration product category listed in Table C402.4 shall be permitted to satisfy the U-factor requirements for each fenestration product category listed in Table C402.4. Individual fenestration products from different product categories listed in Table C402.4 shall not be combined in calculating the area-weighted average U-factor.
  2. Alterations that replace less than 50 percent of entire fenestration units may be replaced with like or better fenestration units to match existing fenestration assemblies.
New work performed shall meet the requirements of this code. Projects changing unconditioned space to conditioned space and costing more than $10,000 shall require 10 percent of the project cost to be used toward meeting the requirements of the North Carolina Energy Conservation Code. Project cost for the purpose of this section is the total project cost listed on all permits related to the work required to convert the unconditioned space to conditioned space and excludes the 10 percent added from this section. Under this section, existing building envelope elements that become a part of the building thermal envelope and are not changed are not required to be upgraded. The additional 10 percent of the project cost shall be appropriated for additional energy conservation features of choice that are addressed in the North Carolina Energy Conservation Code. In addition to the 10-percent project cost, any existing wall, ceiling, or floor cavities that are exposed during construction shall at a minimum be insulated to comply with the North Carolina Energy Conservation Code or be insulated to fill the cavity, whichever is less. Roof systems requiring air space for ventilation shall retain the ventilation space required. Projects costing less than $10,000 are not subject to the 10-percent project cost addition provision.
New building envelope assemblies that are part of the alteration shall comply with Sections C402.1 through C402.5.
The addition of vertical fenestration that results in a total building fenestration area less than or equal to that specified in Section C402.4.1 shall comply with Section C402.4. The addition of vertical fenestration that results in a total building fenestration area greater than Section C402.4.1 shall comply with Section C407.
The addition of skylight area that results in a total building skylight area less than or equal to that specified in Section C402.4.1 shall comply with Section C402.4. The addition of skylight area that results in a total building skylight area greater than Section C402.4.1 shall comply with Section C407. Alterations that result in a total building skylight area exceeding that specified in Section C402.4.1 shall comply with Section C407.
New heating, cooling and duct systems that are part of the alteration shall comply with Sections C403.

Exception:
  1. Not required to comply with Section C403.2.12.
  2. Not required to comply with Section C403.3 where alterations to existing floors, walls, or roof assemblies are required.
New service hot water systems that are part of the alteration shall comply with Section C404.
New lighting systems that are part of the alteration shall comply with Section C405.

Exception. Alterations that replace less than 10 percent of the luminaires in a space, provided that such alterations do not increase the installed interior lighting power.
Repair of the building systems shall not make the building less conforming than it was before the repair was undertaken. Work on nondamaged components necessary for the required repair of damaged components shall be considered part of the repair and shall not be subject to the requirements for alterations in this chapter.

     Where a building was constructed to comply with ANSI/ASHRAE/IESNA 90.1, repairs shall comply with the standard and need not comply with Sections C402, C403, C404 and C405.
Portions of walls that are part of the building thermal envelope shall be insulated in accordance with this code when the repair requires the removal of either the interior or exterior wall membrane such that the wall cavity is exposed during the repair.

Exception: Wall cavities containing existing insulation material.
Repairs requiring the replacement of individual glass panes or sashes shall not require compliance with this code.
New work performed in spaces undergoing a change in occupancy shall comply with the requirements of this code. Unaltered portions of the existing building or building supply system shall not be required to comply with this code.