HomeMy WebLinkAboutResidential New or Addition Energy Code Checklist2021 Washington State Energy Code – Residential
Prescriptive Energy Code Compliance for All Climate Zones in Washington
Single Family – New & Additions (effective March 15, 2024)
Prescriptive Path – Single Family WSEC-R 2021 Edition EPCA C103 (V 01/2024) 1
These requirements apply to all the IRC building types, including detached one- and two-family
dwellings and multiple single-family dwellings (townhouses).
Instructions: This single-family project uses the requirements of the Prescriptive Path below to incorporate
the minimum values listed. Based on the conditioned floor area of the structure, the number of required
additional credits must be selected by the permit applicant.
Provide all information from the following tables in as building permit drawings: Table R402.1.2 - Insulation and
Fenestration Requirements by Component, Table R406.2 - Fuel Normalization Credits and R406.3 Energy Credits.
Authorized Representative
Signature Date
Permit#
Address or Lot & Block
City Zip
All Climate Zones Table 402.1.3
R-Value a U-Factor a
Fenestration U-Factor b, j n/a 0.30
Skylight U-Factor b n/a 0.50
Ceiling e 60 n/a
Wood Frame Wall g,i 20+5 or 13+10 n/a
Floor 30 n/a
Below Grade Wall c,h 10/15/21 int + 5TB n/a
Slab d,f R-Value & Depth 10, 4 ft n/a
a
R-values are minimums. U-factors and SHGC are maximums. When insulation is installed in a cavity which is less than the label or design
thickness of the insulation, the compressed R-value of the insulation from Appendix Table A101.4 shall not be less than the R-value specified
in the table
b The fenestration U-factor column excludes skylights.
c
"10/15/21 +5TB" means R-10 continuous insulation on the exterior of the wall, or R-15 continuous insulation on the interior of the wall, or R-
21 cavity insulation plus a thermal break between the slab and the basement wall at the interior of the basement wall. "10/15/21 +5TB" shall
be permitted to be met with R-13 cavity insulation on the interior of the basement wall plus R-5 continuous insulation on the interior or
exterior of the wall. "5TB" means R-5 thermal break between floor slab and basement wall.
d R-10 continuous insulation is required under heated slab on grade floors. See Section R402.2.9.1.
e For single rafter- or joist-vaulted ceilings, the insulation may be reduced to R-38 if the full insulation depth extends over the top plate of the
exterior wall.
f
R-7.5 continuous insulation installed over an existing slab is deemed to be equivalent to the required perimeter slab insulation when applied
to existing slabs complying with Section R503.1.1. If foam plastic is used, it shall meet the requirements for thermal barriers protecting foam
plastics.
g For log structures developed in compliance with Standard ICC 400, log walls shall meet the requirements for climate zone 5 of ICC 400.
h Int. (intermediate framing) denotes framing and insulation as described in Section A103.2.2 including standard framing 16 inches on center,
78 percent of the wall cavity insulated and headers insulated with a minimum of R-10 insulation.
i The first value is cavity insulation, the second value is continuous insulation. Therefore, as an example, “R13+10” means R-13 cavity
insulation plus R-10 continuous insulation
j
A maximum U-factor of 0.32 shall apply to vertical fenestration products installed in buildings located above 4000 feet in elevation above sea
level, or in windborne debris regions where protection of openings is required under Section R301.2.1.2 of the International Residential
Code.
2021 Washington State Energy Code – Residential
Prescriptive Energy Code Compliance for All Climate Zones in Washington
Single Family – New & Additions (effective March 15, 2024)
Prescriptive Path – Single Family WSEC-R 2021 Edition EPCA C103 (V 01/2024) 2
Each dwelling unit in a residential building shall comply with sufficient options from Table R406.2 (fuel
normalization credits) and Table 406.3 (energy credits) to achieve the following minimum number of
credits. To claim this credit, the building permit drawings shall specify the option selected and the
maximum tested building air leakage, and show the qualifying ventilation system and its control sequence
of operation.
1. Small Dwelling Unit: ........................................................................................... 5.0 credits
Dwelling units less than 1500 square feet in conditioned floor area with less than 300 square feet of
fenestration area. Additions to existing building greater than 500 square feet of heated floor area but less
than 1500 square feet.
2. Medium Dwelling Unit: ...................................................................................... 8.0 credits
All dwelling units that are not included in #1, #3 or #4.
3. Large Dwelling Unit: ..........................................................................................9.0 credits
Dwelling units exceeding 5000 square feet of conditioned floor area.
4. Dwelling units serving Group R-2 occupancies: ................................................ 6.5 credits
Section R401.1 and residential building Section R202 for Group R-2.
5. Additions 150 square feet to 500 square feet: ..................................................... 2.0 credits
The drawings included with the building permit application shall identify which options have been selected and the
point value of each option, regardless of whether separate mechanical, plumbing, electrical, or other permits are
utilized for the project
Before selecting your credits on this Summary table, review the details in Table 406.3 (Single Family), on page 4.
Table R406.2 ENERGY EQUALIZATION CREDITS
Heating
Options Description of Primary Heating Source
Credits -
select ONE
heating
option
1 For combustion heating equipment meeting minimum federal efficiency standards for the
equipment listed in Table C403.3.2(5) or C403.3.2(6) 0 ☐
2
For an initial heating system using a heat pump that meets federal standards for the equipment
listed in Table C403.3.2(2) and supplemental heating provided by electric resistance or a
combustion furnace meeting minimum standards listed in Table C403.3.2(5)b found in the 2021
WSEC- COMMERCIAL ENERGY CODE
1.5 ☐
3 For heating system based on electric resistance only (either forced air or Zonal) 0.5 ☐
4c
For heating system using a heat pump that meets federal standards for the equipment listed in
Table C403.3.2(2) or C403.3.2(9) or Air to water heat pump units that are configured to provide
both heating and cooling and are rated in accordance with AHRI 550/590
3.0 ☐
5
For heating system based on electric resistance with:
1. Inverter-driven ductless mini-split heat pump system installed in the largest zone in the
dwelling,
or
2. With 2kW or less total installed heating capacity per dwelling
2.0 ☐
a. See Section R401.1 and residential building in Section R202 for Group R-2 scope.
b. The gas back-up furnace will operate as fan-only when the heat pump is operating. The heat pump shall operate at
all temperatures above 38°F (3.3°C) (or lower). Below that “changeover” temperature, the heat pump would not
operate to provide space heating. The gas furnace provides heating below 38°F (3.3°C) (or lower).
c. Additional points for the HVAC system are included in Table R406.3.
2021 Washington State Energy Code – Residential
Prescriptive Energy Code Compliance for All Climate Zones in Washington
Single Family – New & Additions (effective March 15, 2024)
Prescriptive Path – Single Family WSEC-R 2021 Edition EPCA C103 (V 01/2024) 3
Summary of Table R406.3
Energy
Options Energy Credit Option Descriptions
Credits - select ONE
energy option from each
category d
Comments:
1.1 Efficient Building Envelope 0.5 ☐
1.2 Efficient Building Envelope 1.0 ☐
1.3 Efficient Building Envelope 1.5 ☐
1.4 Efficient Building Envelope 2.5 ☐
2.1 Air Leakage Control and Efficient Ventilation 1.0 ☐
2.2 Air Leakage Control and Efficient Ventilation 1.5 ☐
2.3 Air Leakage Control and Efficient Ventilation 2.0 ☐
3.1a High Efficiency HVAC 1.0 ☐
3.2 a High Efficiency HVAC 0.5 ☐
3.3a,c,d High Efficiency HVAC 0.5 ☐
3.4a,d High Efficiency HVAC 1.5 ☐
3.5d High Efficiency HVAC 1.5 ☐
3.6a High Efficiency HVAC 1.0 ☐
3.7a,d,e High Efficiency HVAC 2.0 ☐
3.8a,d High Efficiency HVAC 1.0 ☐
3.9c High Efficiency HVAC 0.5 ☐
3.10 High Efficiency HVAC 1.5 ☐
3.11 High Efficiency HVAC 2.5 ☐
4.1 High Efficiency HVAC Distribution System 0.5 ☐
5.1d Efficient Water Heating 0.5 ☐
5.2 Efficient Water Heating 0.5 ☐
5.3 Efficient Water Heating 0.5 ☐
5.4 Efficient Water Heating 1.0 ☐
5.5 Efficient Water Heating 1.5 ☐
5.6 Efficient Water Heating 2.0 ☐
5.7 Efficient Water Heating 2.5 ☐
5.8 Efficient Water Heating 2.5 ☐
6.1e Renewable Electric Energy (4.5 credits max) 0.5-4.5 ☐
7.1 Appliance Package 0.5 ☐
a. An alternative heating source sized at a maximum of 0.5 Watts/ft2 (equivalent) of heated floor area or 500 Watts, whichever is bigger, may be
installed in the dwelling unit.
b. See Section R401.1 and residential building in Section R202 for Group R-2 scope.
c. Option 3.9 can only be taken with Options 3.1 and 3.3. To qualify to claim Option 3.8 with 3.3, the system shall be a 1-2 speed heat pump system.
Variable capacity heat pumps are ineligible from claiming this option.
d. This option may only be claimed if serving System Type 4 or 5 from Table R406.2.
e. Primary living areas include living, dining, kitchen, family rooms, and similar areas.
f Option 3.11 may only be taken with Efficient Water Heating Options 5.1 or 5.2. Equipment sizing for space heating shall be calculated as provided
in Section R403.7 with increased capacity to provide a minimum of 75 percent of peak hot water demand or shall be sized in accordance with
approved manufacturer's specifications or guidance. Supplementary heat for water heating system shall be in accordance with Section R403.5.7.
Total Credits
2021 Washington State Energy Code – Residential
Prescriptive Energy Code Compliance for All Climate Zones in Washington
Single Family – New & Additions (effective March 15, 2024)
Prescriptive Path – Single Family WSEC-R 2021 Edition EPCA C103 (V 01/2024) 4
Table 406.3 – Energy Credits (Single Family)
Option Description Credits: SF
1. EFFICIENT BUILDING ENVELOPE OPTIONS Only one option from Items 1.1 through 1.4 may be selected in this
category. Compliance with the conductive UA targets is demonstrated using Section R402.1.5, Total UA alternative,
where [1-(Proposed UA/Target UA)] > the required %UA reduction
Energy Credit Options Old HSPF HSPF2
3.3 Ducted central heat pump 9.5 8.1
3.5 ductless heat pump in main living area + electric resistance in other rooms 10 9
3.6 ducted central heat pump 11 9.4
3.6 ducted central heat pump – NEEP cc VCHP list 10 8.5
3.7 ductless heat pump with no electric resistance (except footnote A) 10 9
3.7 ductless heat pump with no electric resistance ≤ 24,000 Btu (except footnote A) 9 8.1
1.1 Prescriptive compliance is based on Table R402.1.3 with the following modifications:
Vertical fenestration U = 0.22 0.5
1.2
Prescriptive compliance is based on Table R402.1.3 with the following modifications:
Vertical fenestration U = 0.25 FloorR-38 Slab on grade R-10 perimeter and under entire slab
Below grade slab R-10 perimeter and under entire slab or Compliance based on Section
R402.1.5: Reduce the Total target UA by 15%.
1.0
1.3
Prescriptive compliance is based on Table R402.1.3 with the following modifications:
Vertical fenestration U = 0.18
Ceiling and single-rafter or joist-vaulted R-60 advanced
Wood frame wall R-21 int plus R-12 ci
Floor R-38
Basement wall R-21 int plus R-12 ci
Slab on grade R-10 perimeter and under entire slab
Below grade slab R-10 perimeter and under entire slab
or
Compliance based on Section R402.1.5: Reduce the Total target UA by 22.5%.
1.5
1.4
Prescriptive compliance is based on Table R402.1.3 with the following modifications:
Vertical fenestration U = 0.18
Ceiling and single-rafter or joist-vaulted R-60 advanced
Wood frame wall R-21 int plus R-16 ci
Floor R-48
Basement wall R-21 int plus R-16 ci
Slab on grade R-20 perimeter and under entire slab Below grade slab
R-20 perimeter and under entire slab
Or
Compliance based on Section R402.1.5: Reduce the Total target UA by 30%
2.5
2021 Washington State Energy Code – Residential
Prescriptive Energy Code Compliance for All Climate Zones in Washington
Single Family – New & Additions (effective March 15, 2024)
Prescriptive Path – Single Family WSEC-R 2021 Edition EPCA C103 (V 01/2024) 5
Table 406.3 – Energy Credits (Single Family)
Option Description Credits: SF
2. AIR LEAKAGE CONTROL AND EFFICIENT VENTILATION OPTIONS Only one option from Items 2.1 through 2.3 may be
selected in this category.
2.1
Compliance based on Section R402.4.1.2:
Reduce the tested air leakage to 2.0 air changes per hour maximum at 50 Pascals, or for R-2
Occupancies, optional compliance based on Section R402.4.1.2: Reduce the tested air
leakage to 0.25 cfm/ft2 maximum at 50 Pascals
and
All whole house ventilation requirements as determined by Section M1505.3 of the
International Residential Code or Section 403.8 of the International Mechanical Code shall
be met with a heat recovery ventilation system with minimum sensible heat recovery
efficiency of 0.65.
To qualify to claim this credit, the building permit drawings shall specify the option being
selected, the maximum tested building air leakage, and shall show the qualifying ventilation
system and its control sequence of operation.
1.0
2.2
Compliance based on Section R402.4.1.2:
Reduce the tested air leakage to 1.5 air changes per hour maximum at 50 Pascals, or for R-2
Occupancies, optional compliance based on Section R402.4.1.2: Reduce the tested air
leakage to 0.20 cfm/ft2 maximum at 50 Pascals
and
All whole house ventilation requirements as determined by Section M1505.3 of the
International Residential Code or Section 403.8 of the International Mechanical Code shall
be met with a heat recovery ventilation system with minimum sensible heat recovery
efficiency of 0.75.
To qualify to claim this credit, the building permit drawings shall specify the option being
selected and shall specify the maximum tested building air leakage and shall show the heat
recovery ventilation system.
1.5
2.3
Compliance based on Section R402.4.1.2:
Reduce the tested air leakage to 0.6 air changes per hour maximum at 50 Pascals, or for R-2
Occupancies, optional compliance based on Section R402.4.1.2: Reduce the tested air
leakage to 0.15 cfm/ft2 maximum at 50 Pascals
and
All whole house ventilation requirements as determined by Section M1505.3 of the
International Residential Code or Section 403.8 of the International Mechanical Code shall
be met with a heat recovery ventilation system with minimum sensible heat recovery
efficiency of 0.80. Duct insulation shall comply with Section R403.3.7.
To qualify to claim this credit, the building permit drawings shall specify the option being
selected and shall specify the maximum tested building air leakage and shall show the heat
recovery ventilation system.
2.0
To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify
the maximum tested building air leakage and shall show the heat recovery ventilation system.
2021 Washington State Energy Code – Residential
Prescriptive Energy Code Compliance for All Climate Zones in Washington
Single Family – New & Additions (effective March 15, 2024)
Prescriptive Path – Single Family WSEC-R 2021 Edition EPCA C103 (V 01/2024) 6
Table 406.3 – Energy Credits (Single Family)
Option Description Credits: SF
3. HIGH EFFICIENCY HVAC EQUIPMENT OPTIONS
Only one option from Items 3.1 through 3.8 may be selected in this category. Item 3.9 may be taken with Items 3.1 or
3.3c only.
Reference the chart at the appendix for the HSPF2 Rating conversions for the HVAC selections.
3.1 a
For System Type 1 in Table R406.2:
Energy Star rated (U.S. North) Gas or propane furnace with minimum AFUE of 95%
Or
Energy Star rated (U.S. North) Gas or propane boiler with minimum AFUE of 90%.
To qualify to claim this credit, the building permit drawings shall specify the option being
selected and shall specify the heating equipment type and the minimum equipment
efficiency
1.0
3.2a
For secondary heating system serving System Type 2 in Table R406.2:
Energy Star rated (U.S. North) Gas or propane furnace with minimum AFUE of 95%
Or
Energy Star rated (U.S. North) Gas or propane boiler with minimum AFUE of 90%.
To qualify to claim this credit, the building permit drawings shall specify the option being
selected and shall specify the heating equipment type and the minimum equipment
efficiency.
0.5
3.3a,c,d
Air-source, centrally ducted heat pump with minimum HSPF2 OF 8.1 (HSPF of 9.5)
In areas where the winter design temperature as specified in Appendix RC is 23°F or
below, a cold climate heat pump found on the NEEP cc ASHP qualified product list shall be
used.
To qualify to claim this credit, the building permit drawings shall specify the option being
selected and shall specify the heating equipment type and the minimum equipment
efficiency.
0.5
3.4a,d
Closed-loop ground source heat pump; with a minimum COP of 3.3
or
Open loop water source heat pump with a maximum pumping hydraulic head of 150 feet
and minimum COP of 3.6.
To qualify to claim this credit, the building permit drawings shall specify the option being
selected and shall specify the heating equipment type and the minimum equipment
efficiency.
1.5
3.5 d
Ductless mini-split heat pump system, zonal control: In homes where the primary space
heating system is zonal electric heating, a ductless mini-split heat pump system with a
minimum HSPF of 9 (HSPF 10.0) shall be installed and provide heating to the largest zone of
the housing unit.
To qualify to claim this credit, the building permit drawings shall specify the option being
selected and shall specify the heating equipment type and the minimum equipment
efficiency.
1.5
3.6
A centrally ducted air source cold climate variable capacity heat pump (cc VHP) found on
the NEEP cc VCHP qualified product list with a minimum of HSPF2 of 9.4 (HSPF of 11.0) may
be used to satisfy this requirement.
1.0
2021 Washington State Energy Code – Residential
Prescriptive Energy Code Compliance for All Climate Zones in Washington
Single Family – New & Additions (effective March 15, 2024)
Prescriptive Path – Single Family WSEC-R 2021 Edition EPCA C103 (V 01/2024) 7
Table 406.3 – Energy Credits (Single Family)
Option Description Credits: SF
4. HIGH EFFICIENCY HVAC DISTRIBUTION SYSTEM OPTIONS
In areas where the winter design temperature as specified in Appendix RC is 23°F or below,
an air source centrally ducted heat pump shall be a cold climate variable capacity heat pump
as listed on the NEEP qualified product list.
To qualify to claim this credit, the building permit drawings shall specify the option being
selected and shall specify the heating equipment type and the minimum equipment
efficiency.
3.7a,d,e
Ductless split system heat pumps with no electric resistance heating in the primary living
areas. A ductless heat pump system with a minimum HSPF2 of 9 (HSPF of 10) shall be sized
and installed to provide heat to entire dwelling unit at the design outdoor air temperature.
Exception: In homes with total heating loads of 24,000 BTUs or less using multi-zone mini-
split systems with nominal ratings of 24,000 or less, the minimum HSPF to claim this credit
shall be HSPF2 of 8.1 (HSPF of 9)
To qualify to claim this credit, the building permit drawings shall specify the option being
selected, the heated floor area calculation, the heating equipment type(s), the minimum
equipment efficiency, and total installed heat capacity (by equipment type).
2.0
3.8a,d
Air-to-water heat pump with minimum COP of 3.2 at 47°F, rated in accordance with AHRI
550/590 by an accredited or certified testing lab. To qualify to claim this credit, the
building permit drawings shall specify the option being selected, the heated floor area
calculation, the heating equipment type(s), the minimum equipment efficiency, and total
installed heat capacity (by equipment type).
1.0
3.9,c
Gas-fired heat pump(s) meeting ANSI Z21.40.2 and Z21.40.4 or CSA, with a minimum UEF
of 1.15. For R-2 Occupancy, gas-fired heat pump(s) meeting ANSI Z21.40.2 and Z21.40.4 or
CSA, with a minimum UEF of 1.15, shall serve all units.
1.5
3.10
Combination water heating and space heating system shall include one of the following:
Gas-fired heat pump water heater(s) meeting Tier 2 of the NEEA Advanced Water Heating
Specification for Gas-Fueled Residential Storage Water Heaters Version 1.0.
Or
For R-2 Occupancy, gas-fired heat pump water heater(s) meeting Tier 2 of the NEEA
Advanced Water Heating Specification for Gas-Fueled Residential Storage Water Heaters
Version 1.0., shall serve all units.
or
For R-2 Occupancy, gas-fired heat pump(s) meeting ANSI Z21.40.2 and Z21.40.4 or CSA,
with a minimum UEF of 1.15, shall serve all units.
To qualify to claim this credit, the building permit drawings shall specify the option being
selected and shall specify the water heater equipment type and the minimum equipment
efficiency and, for solar water heating systems, the calculation of the minimum energy
savings.
2.5
3.11
Connected thermostat meeting ENERGY STAR Certified Smart Thermostats/EPA ENERGY
STAR specifications. To qualify to claim this credit, the building permit drawings shall
specify the option being selected and shall specify the thermostat model.
0.5
2021 Washington State Energy Code – Residential
Prescriptive Energy Code Compliance for All Climate Zones in Washington
Single Family – New & Additions (effective March 15, 2024)
Prescriptive Path – Single Family WSEC-R 2021 Edition EPCA C103 (V 01/2024) 8
4.1
HVAC equipment and associated duct system(s) installation shall comply with the
requirements of Section R403.3.2.
Electric resistance heat, hydronic heating and ductless heat pumps are not permitted
under this option.
Direct combustion heating equipment with AFUE less than 80% is not permitted under this
option.
To qualify to claim this credit, the building permit drawings shall specify the option being
selected and shall specify the heating equipment type and shall show the location of the
heating and cooling equipment and all the ductwork.
0.5
Table 406.3 – Energy Credits (Single Family)
Option Description Credits: SF
5. EFFICIENT WATER HEATING OPTIONS
Only one option from Items 5.3 through 5.8 may be selected in this category. Items 5.1 and 5.2 may be combined
with any option.
5.1
A drain water heat recovery unit(s) shall be installed, which captures waste water heat from at
least two showers, including tub/shower combinations. It is acceptable, but not required, for
sink water to be connected. Unit shall have a minimum efficiency of 40% if installed for equal
flow or a minimum efficiency of 54% if installed for unequal flow. Such units shall be rated in
accordance with CSA B55.1 or IAPMO IGC 346-2017 and be so labeled.
To qualify to claim this credit, the building permit drawings shall include a plumbing diagram
that specifies the drain water heat recovery units and the plumbing layout needed to install it.
Labels or other documentation shall be provided that demonstrates that the unit complies with
the standard.
0.5
5.2
For Compact Hot Water Distribution system credit, the volume shall store not more than 16
ounces of water between the nearest source of heated water and the termination of the
fixture supply pipe where calculated using Section R403.5.2. Construction documents shall
indicate the ounces of water in piping between the hot water source and the termination of
the fixture supply. When the hot water source is the nearest primed plumbing loop or trunk,
this must be primed with an On Demand recirculation pump and must run a dedicated ambient
return line from the furthest fixture or end of loop to the water heater.
To qualify for this credit, the dwelling must have a minimum of 1.5 bathrooms.
0.5
5.3
Water heating system shall include the following:
Energy Star rated gas or propane water heater with a minimum
UEF of 0.80.
To qualify to claim this credit, the building permit drawings shall specify the option being
selected and shall specify the water heater equipment type and the minimum equipment
efficiency and, for solar water heating systems, the calculation of the minimum energy savings.
0.5
5.5
Water heating system shall include the following:
Gas-fired heat pump water heater(s) meeting Tier 2 of the NEEA Advanced Water Heating
Specification for Gas-Fueled Residential Storage Water Heaters Version 1.0.
To qualify to claim this credit, the building permit drawings shall specify the option being
selected and shall specify the water heater equipment type and the minimum equipment
efficiency and, for solar water heating systems, the calculation of the minimum energy savings.
1.5
5.6 Water heating system shall include the following: 2.0
2021 Washington State Energy Code – Residential
Prescriptive Energy Code Compliance for All Climate Zones in Washington
Single Family – New & Additions (effective March 15, 2024)
Prescriptive Path – Single Family WSEC-R 2021 Edition EPCA C103 (V 01/2024) 9
Electric heat pump water heater meeting the standards for Tier III of NEEA's advanced water
heating specification
Electric heat pump water heater with a minimum UEF of 2.9 and utilizing a split system
configuration with the air-to-refrigerant heat exchanger located outdoors. Equipment shall
meet Section 4, requirements for all units, of the NEEA standard Advanced Water Heating
Specification with the UEF noted above
To qualify to claim this credit, the building permit drawings shall specify the option being
selected and shall specify the water heater equipment type and the minimum equipment
efficiency.
5.7
Water heating system shall include one of the following:
Electric heat pump water heater with a minimum UEF of 2.9 and utilizing a split system
configuration with the air-to-refrigerant heat exchanger located outdoors. Equipment shall
meet Section 4, requirements for all units, of the NEEA standard Advanced Water Heating
Specification with the UEF noted above.
To qualify to claim this credit, the building permit drawings shall specify the option being
selected and shall specify the water heater equipment type and the minimum equipment
efficiency.
2.5
5.8
Combination water heating and space heating system shall include the following:
Gas-fired heat pump water heater(s) meeting Tier 2 of the NEEA Advanced Water Heating
Specification for Gas-Fueled Residential Storage Water Heaters Version 1.0.
To qualify to claim this credit, the building permit drawings shall specify the option being
selected and shall specify the water heater equipment type and the minimum equipment
efficiency and, for solar water heating systems, the calculation of the minimum energy savings.
2.5
Table 406.3 – Energy Credits (Single Family)
Option Description Credits: SF
6. RENEWABLE ELECTRIC ENERGY OPTION
6.1
For each 600 kWh of electrical generation per housing unit provided annually by on-site
wind or solar equipment a 0.5 credit shall be allowed, up to 4.5 credits. Generation shall be
calculated as follows:
For solar electric systems, the design shall be demonstrated to meet this requirement using
the National Renewable Energy Laboratory calculator PVWATTs or approved alternate by
the code official. Documentation noting solar access shall be included on the plans.
For wind generation projects designs shall document annual power generation based on
the wind turbine power curve; average annual wind speed at the site; frequency
distribution of the wind speed at the site and height of the tower.
To qualify to claim this credit, the building permit drawings shall specify the option being
selected and shall show the photovoltaic or wind turbine equipment type, provide
documentation of solar and wind access, and include a calculation of the minimum annual
energy power production.
0.5 - 4.5
2021 Washington State Energy Code – Residential
Prescriptive Energy Code Compliance for All Climate Zones in Washington
Single Family – New & Additions (effective March 15, 2024)
Prescriptive Path – Single Family WSEC-R 2021 Edition EPCA C103 (V 01/2024) 10
Table 406.3 – Energy Credits (Single Family)
Option Description Credits: SF
7. APPLIANCE PACKAGE OPTION
7.1
All of the following appliances shall be new and installed in the dwelling unit and shall meet
the following standards:
1. Dishwasher, standard – Energy Star rated, Most Efficient 2021 or Dishwasher, compact –
Energy Star rated (Version 6.0)
2. Refrigerator (if provided) – Energy Star rated (Version 5.1)
3. Washing machine (Residential) – Energy Star rated (Version 8.1)
4. Dryer – Energy Star rated, Most Efficient 2022
To qualify to claim this credit, the building permit drawings shall specify the option being
selected and shall show the appliance type and provide documentation of Energy Star
compliance. At the time of inspection, all appliances shall be installed and connected to
utilities. Dryer ducts and exterior dryer vent caps are not permitted to be installed in the
dwelling unit.
0.5
a. An alternative heating source sized at a maximum of 0.5 Watts/ft2 (equivalent) of heated floor area or 500 Watts,
whichever is bigger, may be installed in the dwelling unit.
b. See Section R401.1 and residential building in Section R202 for Group R-2 scope.
c. Option 3.9 can only be taken with Options 3.1 and 3.3. To qualify to claim option 3.8 with 3.3, the system shall be a
1-2 speed heat pump system. Variable capacity heat pumps are ineligible from claiming this option.
d. This option may only be claimed if serving System Type 4 or 5 from Table R406.2.
e. Primary living areas include living, dining, kitchen, family rooms, and similar areas.
f. Option 3.11 may only be taken with Efficient Water Heating Options 5.1 or 5.2. Equipment sizing for space heating
shall be calculated as provided in Section R403.7 with increased capacity to provide a minimum of 75 percent of peak
hot water demand or shall be sized in accordance with approved manufacturer's specifications or guidance.
Supplementary heat for water heating system shall be in accordance with Section R403.5.7.