California

Summary

The current code is state developed and meets or exceeds the requirements of IECC 2009 and ASHRAE 2007. The standard is mandatory for all new residential and non-residential buildings, with energy performance addressing thermal envelope components and energy efficiency requirements for HVAC, hot water, lighting and auxiliary systems. The code allows a prescriptive compliance approach or an Energy Budget Approach; the energy budget can also be used to show compliance of an alteration or addition to an existing building. The 2012 version of the code is due to be released.

California has a long history of energy efficiency standards for buildings. The building efficiency standards have continually improved from 1978 through to the present day with efficiency requirements due to be further strengthened in 2013. The current code and surrounding support systems include a number of dynamic initiatives to improve energy efficiency; Time dependent valuation, local jurisdictions increasing efficiency requirements, certification schemes like HERS, ‘solar ready’ buildings initiative, energy benchmarking of commercial buildings and special requirements for public buildings.

General Information

Full Title of Code

California: 2008 California Code of Regulations: Title 24 (Part 6).

Year of Adoption

2010

Date of Enforcement

Friday, January 1, 2010

Authority in Charge

California Building Standards Commission (CBSC).

Link

http://energycodesocean.org/code-information/2010-california-green-building-stan...

Link to Relevant Web Page

http://energycodesocean.org/code-information/2010-california-green-building-stan...

Remit of Code

Geographical Coverage

California

Code set at:

Regional/States Level

Coverage

Coverage of Building Code:

  • Residential buildings
    • One family
    • Multiple family buildings
      • Time Dependent Valuation (TDV), provides the foundation for Title 24 calculations. TDV applies an hour-by-hour factor and reflects the life cycle value of energy savings, time of year, climate zone, type of fuel, building type and outdoor temperature.
  • Commercial buildings
    • Offices
    • Retail and wholesale
    • Hotels
    • Hospitals
    • Educational buildings
  • Public buildings
    • Offices
    • Hospitals
    • Educational buildings
  • All urban buildings

GBPN Climate Classification:

  • Heating Based
  • 16 Climate Zones - Between heating based and a mixed climate.

Type of Building Code

Type of Building Code:

  • Model code, frame or actual code:
    Statewide Code.
  • Prescriptive Codes:
    Prescriptive approach can be used for both types of buildings, including requirements for building envelopes, space-conditioning systems, service water-heating systems, lighting systems, outdoor lighting systems and Interior and exterior signs.
  • Energy Declaration:
    Partially, in most cases this requirement is only voluntary at this stage. The idea is being developed, public proceddings underway - San Francisco City has a disclosure program where energy declaration is required for certain buildings.
  • Model / reference Building:
    Energy Budgets (reference building) for a proposed building is the sum of the space-conditioning, lighting, and service water-heating budgets expressed in Btu/sf/a. Applicable to residential and non-residential buildings and alterations or additions.

Energy Covered

Basis for Energy Requirements:

  • Overall performance frame:
    Time Dependent Valuation (TDV). Under TDV the value of electricity differs depending on time-of-use (hourly, daily, seasonal), and the value of natural gas differs depending on season.
  • Final Energy:
    Partially, calculation is for 'Site' energy.
  • Life Cycle Assessment considered (embedded energy):
    Partially , not for individual buildings, but within Part 6 there are requirements for when an individual measure is undertaken, a cost optimal analysis is required for that system, including; first cost, ongoing costs, lifecycle savings.

Energy Uses and Functions Covered by the Code:

  • Heating
  • Cooling
  • Ventilation
  • Airtightness
  • Thermal bridging
  • Hot water
  • Building parts (lifts, pumps etc)
  • Technical installations
  • Lighting
  • Appliances
  • Design, position & orientation of building
  • Natural ventilation
  • Solar protection
  • Daylighting requirements
  • Renewable Energy (solar, PV, others):
    Renewable systems can be used to offset expected energy use when completing energy calculations for compliance. Many city only codes have increased requirements for renewable energy. No minimum requirements.
    • Energy Offsets/Green Certificates

Enforcement

Enforcement Status of Code:

Mandatory

Type of Enforcement:

  • Local enforcement
  • Third party inspection
  • Accreditation of applicants
  • Post Occupancy control

On-site Inspections Occur

  • During construction
  • Post completion
  • Post occupancy

Certification to Support Enforcement of Code:

  • Energy Performance Certificate support BC
  • Positive labeling for building beyond the minimum BC level
  • Energy Offsets/Green Certificates
  • Inspection of boilers
  • Inspection of HVAC systems

Penalties for Non-compliance:

  • Refusal of permission to occupy
  • Refusal of permission to construct

Measures Supporting Enforcement:

  • Commissioning requirements
  • Airtightness testing required prior to compliance
  • Mandatory Computer Modeling
  • Training of Inspectors

Values for New Buildings

San Diego/Los Angeles - Low-rise Residential - Light and Heavy Construction.

GBPN Climate Classification

Mixed

Coefficient for Comparison of Climate Zones

0.00

MeanMinMax
HDD (°C)745--
CDD (°C)585--
U-Value (W/m²K)
Roof0.19Roof20.19
Wall0.44Wall22.33
Floor0.3Floor2-
Window2.27Window2-
Others---
Overall U-Value---
Window1Window2
G Value/SHGC0.4-
Visible Transmission--
Percent20%-

Other Requirements Set for:

  • Thermal bridge demands
  • Ventilation:
    General prescriptive minimum efficiency requirements for ventilation systems.
  • Pressure testing for ducting
  • Domestic Hot Water COP - Heat Pump:
    Specific performance requirements apply to all water heating systems, including sizing, prescribed insulation levels, temperature controls, recirculation loops etc.
  • Value for airtightness:
    Only for HERS rating.
  • Technical HVAC systems
  • Efficient Lighting

San Francisco - Low-rise Residential - Light and Heavy Construction.

GBPN Climate Classification

Heating based

Coefficient for Comparison of Climate Zones

0.00

MeanMinMax
HDD (°C)1738--
CDD (°C)150--
U-Value (W/m²K)
Roof0.19Roof20.19
Wall0.44Wall22.33
Floor0.3Floor2-
Window2.27Window2-
Others2.27--
Overall U-Value---
Window1Window2
G Value/SHGC0.4-
Visible Transmission--
Percent20%-

Other Requirements Set for:

  • Thermal bridge demands
  • Ventilation:
    General prescriptive minimum efficiency requirements for ventilation systems.
  • Pressure testing for ducting
  • Domestic Hot Water COP - Heat Pump:
    Specific performance requirements apply to all water heating systems, including sizing, prescribed insulation levels, temperature controls, recirculation loops etc.
  • Value for airtightness:
    HERS buildings only.
  • Technical HVAC systems
  • Efficient Lighting

Fresno - Low-rise Residential - Light and Heavy Construction.

GBPN Climate Classification

Mixed

Coefficient for Comparison of Climate Zones

0.00

MeanMinMax
HDD (°C)1669--
CDD (°C)1091--
U-Value (W/m²K)
Roof0.15Roof20.15
Wall0.3Wall21.19
Floor0.3Floor20.71
Window2.27Window2-
Others2.27--
Overall U-Value---
Window1Window2
G Value/SHGC0.4-
Visible Transmission--
Percent20%-

Other Requirements Set for:

  • Thermal bridge demands
  • Ventilation:
    General prescriptive minimum efficiency requirements for ventilation systems.
  • Pressure testing for ducting
  • Domestic Hot Water COP - Heat Pump:
    Specific performance requirements apply to all water heating systems, including sizing, prescribed insulation levels, temperature controls, re-circulation loops etc.
  • Value for airtightness:
    Only for HERS rated buildings.
  • Technical HVAC systems
  • Efficient Lighting

San Francisco - Non-Residential Buildings.

GBPN Climate Classification

Heating based

Coefficient for Comparison of Climate Zones

0.00

MeanMinMax
HDD (°C)1738--
CDD (°C)150--
U-Value (W/m²K)
Roof0.22Roof20.37
Wall0.34Wall23.69
Floor0.22Floor20.52
Window2.67Window2-
Others3.86--
Overall U-Value---
Window1Window2
G Value/SHGC0.47-
Visible Transmission--
Percent--

Other Requirements Set for:

  • Thermal bridge demands
  • Ventilation:
    General prescriptive minimum efficiency requirements for ventilation systems.
  • Pressure testing for ducting
  • Domestic Hot Water COP - Heat Pump:
    Specific performance requirements apply to all water heating systems, including sizing, prescribed insulation levels, temperature controls, re-circulation loops etc.
  • Technical HVAC systems
  • Efficient Lighting

San Diego/Los Angeles - Non-Residential Buildings.

GBPN Climate Classification

Mixed

Coefficient for Comparison of Climate Zones

0.00

MeanMinMax
HDD (°C)745--
CDD (°C)585--
U-Value (W/m²K)
Roof0.38Roof20.37
Wall0.62Wall23.92
Floor0.4Floor21.53
Window4.37Window2-
Others4.66--
Overall U-Value---
Window1Window2
G Value/SHGC0.61-
Visible Transmission--
Percent--

Other Requirements Set for:

  • Thermal bridge demands
  • Ventilation:
    General prescriptive minimum efficiency requirements for ventilation systems.
  • Pressure testing for ducting
  • Domestic Hot Water COP - Heat Pump:
    Specific performance requirements apply to all water heating systems, including sizing, precribed insulation levels, temperature controls, recirculation loops etc
  • Technical HVAC systems
  • Efficient Lighting

Fresno Climate - Non-Residential Buildings.

GBPN Climate Classification

Mixed

Coefficient for Comparison of Climate Zones

0.00

MeanMinMax
HDD (°C)1669--
CDD (°C)1091--
U-Value (W/m²K)
Roof0.22Roof20.37
Wall0.34Wall21.2
Floor0.4Floor20.52
Window2.67Window2-
Others3.86--
Overall U-Value---
Window1Window2
G Value/SHGC0.31-
Visible Transmission--
Percent--

Other Requirements Set for:

  • Thermal bridge demands
  • Ventilation:
    General prescriptive minimum efficiency requirements for ventilation systems.
  • Pressure testing for ducting
  • Domestic Hot Water COP - Heat Pump:
    Specific performance requirements apply to all water heating systems, including sizing, prescribed insulation levels, temperature controls, re-circulation loops etc.
  • Technical HVAC systems
  • Efficient Lighting

San Diego/Los Angeles - High-Rise Residential Buildings and Guest Rooms of Hotels and Motels.

GBPN Climate Classification

Mixed

Coefficient for Comparison of Climate Zones

0.00

MeanMinMax
HDD (°C)745-771
CDD (°C)585--
U-Value (W/m²K)
Roof0.16Roof20.37
Wall0.34Wall23.92
Floor0.22Floor20.52
Window2.67Window2-
Others4.66--
Overall U-Value---
Window1Window2
G Value/SHGC0.61-
Visible Transmission--
Percent40%-

Other Requirements Set for:

  • Thermal bridge demands
  • Ventilation:
    General prescriptive minimum efficiency requirements for ventilation systems.
  • Pressure testing for ducting
  • Domestic Hot Water COP - Heat Pump:
    Specific performance requirements apply to all water heating systems, including sizing, prescribed insulation levels, temperature controls, re-circulation loops etc.
  • Technical HVAC systems
  • Efficient Lighting

San Francisco - High-Rise Residential Buildings and Guest Rooms of Hotels and Motels.

GBPN Climate Classification

Heating based

Coefficient for Comparison of Climate Zones

0.00

MeanMinMax
HDD (°C)1738--
CDD (°C)150--
U-Value (W/m²K)
Roof0.16Roof20.37
Wall0.34Wall20.91
Floor0.19Floor20.26
Window2.67Window2-
Others3.86--
Overall U-Value---
Window1Window2
G Value/SHGC0.47-
Visible Transmission--
Percent40%-

Other Requirements Set for:

  • Thermal bridge demands
  • Ventilation:
    General prescriptive minimum efficiency requirements for ventilation systems.
  • Pressure testing for ducting
  • Domestic Hot Water COP - Heat Pump:
    Specific performance requirements apply to all water heating systems, including sizing, prescribed insulation levels, temperature controls, re-circulation loops etc.
  • Technical HVAC systems
  • Efficient Lighting

Fresno - High-rise residential buildings and guest rooms of hotels and motels.

GBPN Climate Classification

Mixed

Coefficient for Comparison of Climate Zones

0.00

MeanMinMax
HDD (°C)1091--
CDD (°C)1669--
U-Value (W/m²K)
Roof0.16Roof20.37
Wall0.34Wall21.2
Floor0.22Floor20.34
Window2.67Window2-
Others3.86--
Overall U-Value---
Window1Window2
G Value/SHGC0.4-
Visible Transmission--
Percent40%-

Other Requirements Set for:

  • Thermal bridge demands
  • Ventilation:
    General prescriptive minimum efficiency requirements for ventilation systems.
  • Pressure testing for ducting
  • Domestic Hot Water COP - Heat Pump:
    Specific performance requirements apply to all water heating systems, including sizing, prescribed insulation levels, temperature controls, re-circulation loops etc.
  • Technical HVAC systems
  • Efficient Lighting

Code History and Future Targets

General Process in Setting Requirements:

  • How far in advance are future targets set?:
    0
    2020 for residential and 2030 for commercial
  • Stakeholders are informed of future targets far in advance

Zero Energy Targets:

  • Definition of nZEB/ZEB/Plus Energy etc:
    The amount of energy provided by on-site renewable energy sources is equal to the amount of energy used by the building.
  • All end uses are included
  • There is not a realistic roadmap in place
  • National Target date for nZEB:
    State target, residential by 2020 and commercial by 2030 - all new commercial buildings and half of the existing commercial building stock be nZEB by 2030 (energy use will need to decrease by 60-70%). These targets are policy at this stage, not regulation or law.
  • Special Requirements for public buildings:
    State buildings and build-to-suit leases larger than 10,000 square feet obtain LEED “Silver” or higher. State agencies, departments, and other entities under direct executive authority take actions to reduce entity-wide greenhouse gas emissions.
  • Links

Number of Earlier Codes

2

Current Defined Levels beyond Minimum Standard (present code)

0

Number of Future Aspirational Codes

2

Multiple set of data:

  • Levels beyond minimum:
    2
  • Year historic or aspirational codes (planned) :
    2015
  • Actual level of energy consumption in target
    • Relative target in percent:
      0
    • Absolute target:
      0

Supporting Measures

Incentives/Rewards to Encourage People to go beyond Minimum Level?

There are many programs available, these include City Green Building Incentives (San Diego & Santa Monica), Local Rebate Programs, PACE financing, Performance Based Incentives, State Rebate Programs, Utility Grant Programsand Utility Rebate Programs.

Involvement of Stakeholders in the Development of Codes

A very open public process, development partners are utilities, they have a lot of involvement in the process. Meetings are called with stakeholders, the new measures are presented to the various stakeholders.

Level of Training Provided to Stakeholders Following Implementation of Code?

The energy commission provides an online learning center and for each code update, utilities offer a series of seminars and workshops in each region, covering lighting, HVAC, envelope and simulation tools, the training are predominantly free.

Provision of Appropriate Information for General Public

Websites, seminars, courses etc.

Supporting Labeling Schemes

US Green Building Council’s Leadership in Energy and Environmental Design (LEED), Build It Green’s GreenPoint Rated (GPR) scheme, the German Passivhaus system (or Passive House in English), and the California Green Building Code (CALGreen).

Supporting Certification Schemes

US Green Building Council’s Leadership in Energy and Environmental Design (LEED), Build It Green’s GreenPoint Rated (GPR) scheme, the German Passivhaus system (or Passive House in English), and the California Green Building Code (CALGreen).

Codes Free to Access?

http://www.energy.ca.gov/2008publications/CEC-400-2008-001/CEC-400-2008-001-CMF.PDF

Text on Code Access

http://www.energy.ca.gov/2008publications/CEC-400-2008-001/CEC-400-2008-001-CMF.PDF