ADOPTS WITH AMENDMENTS:

International Energy Conservation Code 2018 (IECC 2018)

Heads up: There are no amended sections in this chapter.
The provisions of this chapter shall control the alteration, repair, addition and change of occupancy of existing buildings and structures.
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.
Buildings and structures, and parts thereof, shall be maintained in a safe and sanitary condition. Devices and systems which are required by this code shall be maintained in conformance with the code edition under which installed. The owner or the owner's authorized agent shall be responsible for the maintenance of buildings and structures. The requirements of this chapter shall not provide the basis for removal or abrogation of energy conservation, fire protection and safety systems and devices in existing structures.

For existing building projects where an addition or building envelope retrofit area is combined with existing-to-remain building areas to demonstrate compliance with this code as a whole building, the U-factors applied to existing-to-remain envelope assemblies shall be in accordance with record documents.

Exception: If accurate record documents are not available, U-factors for the existing envelope assemblies may be in accordance with the edition of the Washington State Energy Code that was in effect at the time the building was permitted, or as approved by the code official.

For the installation of new or replacement mechanical equipment that serves existing building areas, design loads associated with heating, cooling and ventilation of the existing building areas served shall be determined in accordance with Section C403.1.2.

R-values and U-factors used to determine existing thermal envelope performance for the purpose of calculating design loads shall be in accordance with record documents or existing conditions.

Exception: If accurate record documents are not available, R-values and U-factors used to determine existing building thermal envelope performance may be in accordance with the edition of the Washington State Energy Code that was in effect at the time the building was permitted, or as approved by the code official.

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 no hazard to life, health or property is created. Hazardous materials shall not be used where the code for new construction would not permit their use in buildings of similar occupancy, purpose and location.
The building official may modify the specific requirements of this code for historic buildings and require alternate provisions which will result in a reasonable degree of energy efficiency. This modification may be allowed for those buildings or structures that are listed in the state or national register of historic places; designated as a historic property under local or state designation law or survey; certified as a contributing resource with a national register listed or locally designated historic district; or with an opinion or certification that the property is eligible to be listed on the national or state registers of historic places either individually or as a contributing building to a historic district by the state historic preservation officer or the keeper of the national register of historic places.
Existing building systems shall be commissioned in accordance with Section C408. For the purposes of meeting the commissioning thresholds in Section C408.1, only the new and altered system capacities are considered when determining whether the project is exempt from some portion of the commissioning process.
Additions to an existing building, building system or portion thereof shall conform to the provisions of this code as they 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 Sections C402, C403, C404, C405, C406, C409.5, C410 and C502.2.
Additions shall comply with Sections C502.2.1 through C502.2.6.2.

Additions with vertical fenestration that results in a total building vertical 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 vertical fenestration area greater than that specified in Section C402.4.1 shall comply with one of the following:

  1. Component performance alternative with target area adjustment per Section C402.1.5 for the addition area of the building only.
  2. Existing building and addition area are combined to demonstrate compliance with the component performance alternative for the whole building.
  3. Total building performance in accordance with Section C407 for the addition area of the building only.
  4. Total building performance for the whole building.

Additions with skylights that result in a total building skylight area less than or equal to that specified in Section C402.4.1 shall comply with Section C402.4. Additions with skylights that result in a total building skylight area greater than that specified in Section C402.4.1 shall comply with one of the following:

  1. Vertical fenestration alternate per Section C402.4.1.1 or C402.4.1.3 for the addition area of the building only
  2. Component performance alternative with the target area adjustment per Section C402.1.5 for the addition area of the building only.
  3. Existing building and addition area combined to demonstrate compliance with the component performance alternative for the whole building.
  4. Total building performance in accordance with Section C407 for the addition area of the building only.
  5. Total building performance for the whole building.
New mechanical systems and equipment serving the building heating, cooling or ventilation needs, that are part of the addition, shall comply with Section C403.
New service water-heating equipment, controls and service water heating piping shall comply with Section C404.
New pools and permanent spas shall comply with Section C404.11.
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 refrigerated spaces and refrigeration equipment shall comply with Section C410.

Alterations to any building or structure shall comply with the requirements of Section C503 and the code for new construction. Alterations to an existing building, building system or portion thereof shall conform to the provisions of this code as they relate to new construction without requiring the unaltered portions of the existing building or building system to comply with this code. Alterations shall be 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.

Exception: The following alterations need not comply with the requirements for new construction provided the energy use of the building is not increased:

  1. Storm windows installed over existing fenestration.
  2. Surface-applied window film installed on existing single pane fenestration assemblies to reduce solar heat gain provided the code does not require the glazing fenestration to be replaced.
  3. Existing ceiling, wall or floor cavities exposed during construction provided that these cavities are insulated to full depth with insulation having a minimum nominal value of R-3.0 per inch installed per Section C402.
  4. Construction where the existing roof, wall or floor cavity is not exposed.
  5. Roof recover.
  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. 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.

Any low energy space in accordance with Section C402.1.1.1 that is altered to become conditioned space or semi-heated space shall be brought into full compliance with this code. Any semi-heated space in accordance with Section C402.1.1.2 that is altered to become conditioned space shall be brought into full compliance with this code.

For buildings with more than one space conditioning category, the interior partition walls, ceilings, floors and fenestration that separate space conditioning areas shall comply with the thermal envelope requirements per the area with the highest level of space conditioning.

A change in space conditioning project shall be deemed to comply with this code if the project area alone complies or if the existing building and the project area combined comply with this code as a whole building.

Exception: Buildings or spaces that were permitted prior to the 2009 Washington State Energy Code, or were originally permitted as unconditioned, may comply with this section as follows:

  1. Where the component performance alternative in Section C402.1.5 is used to demonstrate compliance with this section, the Proposed Total UA is allowed to be up to 110 percent of the Allowable Total UA. This exception may be applied to the project area alone, or to the existing building and project area combined as a whole building.
  2. Where total building performance in Section C407 is used to demonstrate compliance with this section, the total annual carbon emissions from energy consumption of the proposed design is allowed to be up to 110 percent of the annual carbon emissions from energy consumption allowed by Section C407.3. This exception may be applied to the project area alone, or to the existing building and project area combined as a whole building.

New building envelope assemblies that are part of the alteration shall comply with Sections C402.1 through C402.5 as applicable.

Exception: Air leakage testing is not required for alterations and repairs, unless the project includes a change in space conditioning according to Section C503.2 or a change of occupancy or use according to Section C505.1.

Roof replacements shall comply with Table C402.1.3 or C402.1.4 where the existing roof assembly is part of the building thermal envelope and contains insulation entirely above the roof deck.

The addition of vertical fenestration that results in a total building vertical fenestration area less than or equal to that specified in Section C402.4.1 shall comply with Section C402.4. Alterations that result in a total building vertical fenestration area greater than specified in Section C402.4.1 shall comply with one of the following:

  1. Vertical fenestration alternate in accordance with Section C402.4.1.3 for the new vertical fenestration added.
  2. Vertical fenestration alternate in accordance with Section C402.4.1.1 for the area adjacent to the new vertical fenestration added.
  3. Existing building and alternation area are combined to demonstrate compliance with the component performance alternative with target area adjustment in accordance with Section C402.1.5 for the whole building. The Proposed Total UA is allowed to be up to 110 percent of the Allowed Total UA.
  4. Total building performance in accordance with Section C407 for the whole building. The total annual carbon emissions from energy consumption of the proposed design are allowed to be up to 110 percent of the annual carbon emissions from energy consumption allowed in accordance with Section C407.3.

Exception: Additional envelope upgrades are included in the project so the addition of vertical fenestration does not cause a reduction in overall building energy efficiency, as approved by the code official.

Where some or all of an existing fenestration unit is replaced with a new fenestration product, including sash and glazing, the replacement fenestration unit shall meet the applicable requirements for U-factor and SHGC in Table C402.4.

Exception: 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.

The addition of skylights 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 skylights that results in a total building skylight area greater than that specified in Section C402.4.1 shall comply with one of the following:

  1. Existing building and alteration area are combined to demonstrate compliance with the component performance alternative with target area adjustment in accordance with Section C402.1.5 for the whole building. The Proposed Total UA is allowed to be up to 110 percent of the Allowed Total UA.
  2. Total building performance in accordance with Section C407 for the whole building. The total annual carbon emissions from energy consumption of the proposed design are allowed to be up to 110 percent of the annual carbon emissions from energy consumption allowed in accordance with Section C407.3.

Exception: Additional envelope upgrades are included in the project so the addition of skylights does not cause a reduction in overall building energy efficiency, as approved by the code official.

Those parts of systems which are altered or replaced shall comply with Section C403. Additions or alterations shall not be made to an existing mechanical system that will cause the existing mechanical system to become out of compliance.

Exceptions:

  1. Existing mechanical systems which are altered or where parts of the system are replaced are not required to be modified to comply with Section C403.3.5 as long as mechanical cooling capacity is not added to a system that did not have cooling capacity prior to the alteration.
  2. Alternate mechanical system designs that are not in full compliance with this code may be approved when the code official determines that existing building constraints including, but not limited to, available mechanical space, limitations of the existing structure, or proximity to adjacent air intakes or exhausts make full compliance impractical. Alternate designs shall include additional energy saving strategies not prescriptively required by this code for the scope of the project including, but not limited to, demand control ventilation, energy recovery, or increased mechanical cooling or heating equipment efficiency above that required by Tables C403.3.2(1) through C403.3.2(12).
  3. Only those components of existing HVAC systems that are altered or replaced shall be required to meet the requirements of Section C403.8.1, Allowable fan motor horsepower. Components replaced or altered shall not exceed the fan power limitation pressure drop adjustment values in Table C403.8.1(2) at design conditions. Section C403.8.1 does not require the removal and replacement of existing system ductwork.

TABLE C503.4

ECONOMIZER COMPLIANCE OPTIONS FOR MECHANICAL ALTERATIONS

OPTION A OPTION B
(alternate to A)
OPTION C
(alternate to A)
OPTION D
(alternate to A)
UNIT TYPE Any alteration with
new or replacement
equipment
Replacement unit of the same
type with the same or smaller
output capacity
Replacement unit of the same
type with a larger output
capacity
New equipment added
to existing system or
replacement unit of a different
type
1. Packaged Units Efficiency: min.a
Economizer:
Section C403.5b
Efficiency: min.a
Economizer: Section C403.5b
Efficiency: min.a
Economizer: Section C403.5b
Efficiency: min.a
Economizer: Section C403.5b
2. Split Systems Efficiency: min.a
Economizer:
Section C403.5b
For units ≤ 60,000 Btuh,
comply with two of two
measures:
  1. Efficiency: + 10%e
  2. Economizer: shall not
    decrease existing
    economizer capability

For all other capacities:

For units ≤ 60,000 Btuh
replacing unit installed prior
to 1991, comply with at least
one of two measures:
  1. Efficiency: + 10%e
  2. Economizer: 50%f

For all other capacities:

Efficiency: min.a
Economizer: Section C403.5b
3. Water Source Heat
Pump
Efficiency: min.a
Economizer:
Section C403.5b
For units ≤ 72,000 Btuh,
comply with at least two of
three measures:
  1. Efficiency: + 10%e
  2. Flow control valveg
  3. Economizer: 50%f

For all other capacities:

For units ≤ 72,000 Btuh,
comply with at least two of
three measures:
  1. Efficiency: + 10%e
  2. Flow control valveg
  3. Economizer: 50%f
    (except for certain pre-
    1991 systemsh)

For all other capacities:

Efficiency: min.a
Economizer: Section C403.5b
(except for certain pre-1991
systemsq)
4. Water Economizer
using Air-Cooled
Heat Rejection
Equipment (Dry
Cooler)
Efficiency: min.a
Economizer:
Section C403.5b
Efficiency: +5%d
Economizer: shall not
decrease existing economizer
capacity
Efficiency: min.a
Economizer: Section C403.5b
Efficiency: min.a
Economizer: Section C403.5b
5. Air-Handling Unit
(including fan coil
units) where the
system has an
air-cooled chiller
Efficiency: min.a
Economizer:
Section C403.5b
Economizer: shall not
decrease existing economizer
capacity
Efficiency: min.a
Economizer: Section C403.5b
(except for certain pre-1991
systemsq)
Efficiency: min.a
Economizer: Section C403.5b
(except for certain pre-1991
systemsq)
6. Air- Handling Unit
(including fan coil
units) and Water-
cooled Process
Equipment, where
the system has a
water-cooled chillerj
Efficiency: min.a
Economizer:
Section C403.5b
Economizer: shall not
decrease existing economizer
capacity
Efficiency: min.a
Economizer: Section C403.5b
(except for certain pre-1991
systemsh and certain 1991-
2016 systemsi.)
Efficiency: min.a
Economizer: Section C403.5b
(except for certain pre-1991
systemsh and certain 1991-
2016 systemsi)
7. Cooling Tower Efficiency: min.a
Economizer:
Section C403.5b
No requirements Efficiency: min.a
Economizer: Section C403.5b
Efficiency: min.a
Economizer: Section C403.5b
8. Air-Cooled Chiller Efficiency: min.a
Economizer:
Section C403.5b
Efficiency: + 10%k
Economizer: shall not
decrease existing economizer
capacity
Efficiency: Comply with two
of two measures:
  1. + 10%k,l
  2. Multistage
Economizer: shall not
decrease existing economizer
capacity
Efficiency: min.a
Economizer: Section C403.5b
9. Water-Cooled
Chiller
Efficiency: min.a
Economizer: Section C403.5b
Efficiency: Comply with at
least one of two measures:
  1. Part load IPLV + 15%n
  2. Plate frame heat
    exchangero
Economizer: shall not
decrease existing economizer
capacity
Efficiency: Comply with two
of two measures:
  1. Part load IPLV + 15%n
  2. Plate frame heat
    exchangero
Economizer: shall not
decrease existing economizer
capacity
Efficiency: min.a
Economizer: Section C403.5b
  1. Minimum equipment efficiency shall comply with Section C403.3.2 and Tables C403.3.2(1) through C403.3.2(12).
  2. All separate new equipment and replacement equipment shall have air economizer complying with Section C403.5 including both the individual unit size limits and the total building capacity limits on units without economizer. It is acceptable to comply using one of the exceptions to Section C403.5.
  3. Reserved.
  4. Equipment shall have a capacity-weighted average cooling system efficiency that is 5 percent better than the requirements in Tables C403.3.2(1) and C403.3.2(2) (1.05 × values in Tables C403.3.2(1) and C403.3.2(2)).
  5. Equipment shall have a capacity-weighted average cooling system efficiency that is 10 percent better than the requirements in Tables C403.3.2(1)A and C403.3.2(2) (1.10 × values in Tables C403.3.2(1)A and C403.3.2(2)).
  6. Minimum of 50-percent air economizer that is ducted in a fully enclosed path directly to every heat pump unit in each zone, except that ducts may terminate within 12 inches of the intake to an HVAC unit provided that they are physically fastened so that the outside air duct is directed into the unit intake. If this is an increase in the amount of outside air supplied to this unit, the outside air supply system shall be configured to provide this additional outside air and be equipped with economizer control.
  7. Water-source heat pump systems shall have a flow control valve to eliminate flow through the heat pumps that are not in operation and variable speed pumping control complying with Section C403.4.3 for that heat pump.

    • When the total capacity of all units with flow control valves exceeds 15 percent of the total system capacity, a variable frequency drive shall be installed on the main loop pump.
    • As an alternate to this requirement, the capacity-weighted average cooling system efficiency shall be 5 percent better than the requirements in footnote e for water-source heat pumps (i.e., a minimum of 15 percent better than the requirements in Table C403.3.2(2) (1.15 × values in Table C403.3.2(2)).
  8. Water economizer equipment shall have a capacity-weighted average cooling system efficiency that is 10 percent better than the requirements in Tables C403.3.2(8) and C403.3.2(9) (1.10 × values in Tables C403.3.2(8) and C403.3.2(9)).
  9. Air economizer is not required for systems installed with water economizer plate and frame heat exchanger complying with previous codes between 1991 and June 2016, provided that the total fan coil load does not exceed the existing or added capacity of the heat exchangers.
  10. For water-cooled process equipment where the manufacturers specifications require colder temperatures than available with water-side economizer, that portion of the load is exempt from the economizer requirements.
  11. The air-cooled chiller shall have an IPLV efficiency that is a minimum of 10 percent greater than the IPLV requirements in EER in Table C403.3.2(7)(1.10 × IPLV values in EER in Table C403.3.2(7)).
  12. The air-cooled chiller shall be multistage with a minimum of two compressors.
  13. Reserved.
  14. The water-cooled chiller shall have an IPLV value that is a minimum of 15 percent lower than the IPLV requirements in Table C403.3.2(7), (1.15 × IPLV values in Table C403.3.2(7)). Water-cooled centrifugal chillers designed for nonstandard conditions shall have an NPLV value that is at least 15 percent lower than the adjusted maximum NPLV rating in kW per ton defined in Section C403.3.2.1 (1.15 × NPLV).
  15. Economizer cooling shall be provided by adding a plate-frame heat exchanger on the water-side with a capacity that is a minimum of 20 percent of the chiller capacity at standard AHRI rating conditions.
  16. Reserved.
  17. Systems installed prior to 1991 without fully utilized capacity are allowed to comply with Option B, provided that the individual unit cooling capacity does not exceed 90,000 Btuh.
All new mechanical systems in existing buildings, including packaged unitary equipment and packaged split systems, shall comply with Section C403.

Where mechanical cooling is added to a space that was not previously cooled, the mechanical system shall comply with either Section C403.3.5 or C403.5.

Exceptions:

  1. Qualifying small equipment: Economizers are not required for cooling units and split systems serving one zone with a total cooling capacity rated in accordance with Section C403.3.2 of less than 33,000 Btu/h (hereafter referred to as qualifying small systems) provided that these are high-efficiency cooling equipment with SEER and EER values more than 15 percent higher than minimum efficiencies listed in Tables C403.3.2 (1) through (3), in the appropriate size category, using the same test procedures. Equipment shall be listed in the appropriate certification program to qualify for this exception. The total capacity of all qualifying small equipment without economizers shall not exceed 72,000 Btu/h per building, or 5 percent of the building total air economizer capacity, whichever is greater.

    Notes and exclusions for Exception 1:

    1. 1.1. The portion of the equipment serving Group R occupancies is not included in determining the total capacity of all units without economizers in a building.
    2. 1.2. Redundant units are not counted in the capacity limitations.
    3. 1.3. This exception shall not be used for the initial tenant improvement of a shell-and-core building or space, or for total building performance in accordance with Section C407.
    4. 1.4. This exception shall not be used for unitary cooling equipment installed outdoors or in a mechanical room adjacent to the outdoors.
  2. Chilled water terminal units connected to systems with chilled water generation equipment with IPLV values more than 25 percent higher than minimum part load equipment efficiencies listed in Table C403.3.2(7), in the appropriate size category, using the same test procedures. Equipment shall be listed in the appropriate certification program to qualify for this exception. The total capacity of all systems without economizers shall not exceed 480,000 Btu/h per building, or 20 percent of the building total air economizer capacity, whichever is greater.

    Notes and exclusions for Exception 2:

    1. 2.1. The portion of the equipment serving Group R occupancy is not included in determining the total capacity of all units without economizers in a building.
    2. 2.2. This exception shall not be used for the initial tenant improvement of a shell-and-core building or space, or for total building performance in accordance with Section C407.
Alterations to, or replacement of, existing mechanical cooling systems shall not decrease the building total economizer capacity unless the system complies with either Section C403.3.5 or C403.5. System alterations or replacement shall comply with Table C503.4 when the individual cooling unit capacity and the building total capacity of all cooling equipment without economizer do not comply with Sections C403.3.5 or C403.5.
When space cooling equipment is replaced, controls shall comply with all requirements under Section C403.3.5 and related subsections, and Section C403.5.1. for integrated economizer control.
Existing equipment currently in use may be relocated within the same floor or same tenant space if removed and reinstalled within the same permit.
New service hot water systems that are part of the alteration shall comply with Section C404.
Alterations or the addition of lighting, controlled receptacles and motors shall comply with Sections C503.6.1 through C503.6.6.
Alterations that add or replace 50 percent or more of the luminaires in a space enclosed by walls or ceiling-height partitions, replace 50 percent or more of parking garage luminaires, or replace 50 percent or more of the total installed wattage of exterior luminaires shall comply with Sections C405.4 and C405.5. Where less than 50 percent of the fixtures in an interior space enclosed by walls or ceiling-height partitions or in a parking garage are added or replaced, or less than 50 percent of the installed exterior wattage is replaced, the installed lighting wattage shall be maintained or reduced.
Where new wiring is being installed to serve added fixtures and/or fixtures are being relocated to a new circuit, controls shall comply with Sections C405.2.1, C405.2.3, C405.2.4, C405.2.5, and C405.2.6, and as applicable C408.3. New lighting control devices shall comply with the requirements of Section C405.2.
Where a new lighting panel (or a moved lighting panel) with all new raceway and conductor wiring from the panel to the fixtures is being installed, controls shall also comply with, in addition to the requirements of Section C503.6.2, all remaining requirements in Sections C405.2 and C408.3.
Where new walls or ceiling-height partitions are added to an existing space and create a new enclosed space, but the lighting fixtures are not being changed, other than being relocated, the new enclosed space shall have controls that comply with Sections C405.2.1, C405.2.2, C405.2.3, C405.2.4, C405.2.5 and C408.3.
Those motors which are altered or replaced shall comply with Section C405.8.

Where electric receptacles are added or replaced, controlled receptacles shall be provided in accordance with Section C405.10.

Exceptions:

  1. Where an alteration project impacts an area smaller than 5,000 square feet (465 m2), controlled receptacles are not required.
  2. Where existing systems furniture or partialheight relocatable office cubicle partitions are reconfigured or relocated within the same area, controlled receptacles are not required in the existing systems furniture or office cubicle partitions.
  3. Where new or altered receptacles meet the exception to Section C405.10, they are not required to be controlled receptacles or be located within 12 inches (305 mm) of noncontrolled receptacles.
Those parts of systems which are altered or replaced shall comply with Section C410. Additions or alterations shall not be made to an existing refrigerated space or system that will cause the existing mechanical system to become out of compliance. All new refrigerated spaces or systems in existing buildings, including refrigerated display cases, shall comply with Section C410.
Buildings and structures, and parts thereof, shall be repaired in compliance with Section C501.3 and this section. Work on nondamaged components that is 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. Routine maintenance required by Section C501.3, ordinary repairs exempt from permit, and abatement of wear due to normal service conditions shall not be subject to the requirements for repairs in this section.

For the purposes of this code, the following shall be considered repairs.

  1. Glass-only replacements in an existing sash and frame.
  2. Roof repairs.
  3. Air barriers shall not be required for roof repair where the repairs to the building do not include alterations, renovations or repairs to the remainder of the building envelope.
  4. 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.
  5. Repairs where only the bulb and/or ballast within the existing luminaires in a space are replaced provided that the replacement does not increase the installed interior lighting power.

Spaces undergoing a change in occupancy shall be brought up to full compliance with this code in the following cases:

  1. Any space that is converted from an F, S or U occupancy to an occupancy other than F, S or U.
  2. Any space that is converted to a Group R dwelling unit or portion thereof, from another use or occupancy.
  3. Any Group R dwelling unit or portion thereof permitted prior to July 1, 2002, that is converted to a commercial use or occupancy.

Exception: Buildings or spaces that were permitted prior to the 2009 Washington State Energy Code, or were originally permitted as unconditioned, may comply with this section as follows:

  1. Where the component performance alternative in Section C402.1.5 is used to demonstrate compliance with this section, the Proposed Total UA is allowed to be up to 110 percent of the Allowable Total UA. This exception may be applied to the project area alone, or to the existing building and project area combined as a whole building.
  2. Where total building performance in Section C407 is used to demonstrate compliance with this section, the total annual carbon emissions from energy consumption of the proposed design is allowed to be 110 percent of the annual carbon emissions from energy consumption allowed by Section C407.3. This exception may be applied to the project area alone, or to the existing building and project area combined as a whole building.

Where the use in a space changes from one use in Table C405.4.2(1) or (2) to another use in Table C405.4.2(1) or (2), the installed lighting wattage shall comply with Section C405.4.

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