Office of Energy and Sustainable Development
Office of Energy and Sustainable Development

Building Energy Saving Ordinance (BESO)

BESO to replace RECO/CECO 
Effective December 1, 2015, Berkeley's Energy Saving Ordinance (Berkeley Municipal Code 19.81) will replace both the Residential and Commercial Energy Conservation Ordinances (RECO and CECO). With BESO, the RECO/CECO requirements of installing energy and water efficiency improvement measures, will no longer be required.

Transition Period: The transition from RECO/CECO to BESO will occur between October 9, 2015 and December 1, 2015.  As of October 9, 2015, RECO and CECO requirements will no longer be required at time of building renovation due to enhanced energy codes and CalGreen standards. For buildings up for sale between October 9 to December 1, 2015, sellers may choose to either complete RECO/CECO measures or a BESO assessment. As of December 1, 2015, all new sales transactions of medium and small buildings, including homes, must comply with BESO. Previous completion of requirements under RECO/CECO will not fulfill BESO requirements. For more information on the transition schedule, see: Transitioning from RECO/CECO to BESO.

What does BESO Require?

  • Energy efficiency assessment (improvements are voluntary)
  • Public reporting of energy information and disclosure prior to sale
  • High performance buildings are exempt from assessment requirements

Early Compliance BESO Home Energy Score Rebates
Starting September 2015, a limited rebate program provides up to $200 for BESO-compliant Home Energy Score Assessments. Check for BESO rebate eligibility, availability, and application. To reserve your BESO Home Energy Score Rebate, see:  

BESO Reporting Schedule:

  • BESO Prior to Sale: Required for all buildings except large buildings (25,000 square feet or more)
  • BESO Phase-In Schedule (excludes homes of 1-4 units), see table below.

Building Size (sq ft)

Due  Date

Reporting Cycle

Large buildings: 50,000 or more


Energy Assessment every 5 years
ENERGY STAR Performance Report annually

Large buildings: 25,000- 49,999


Medium buildings:15,000-24,999


Energy Assessment every 8 years 

Medium buildings: 5,000-14,999


Small buildings: Less than 5,000 (excluding 1-4 unit homes)


Energy Assessment every 10 years



For questions, email or call 510-981-7432.

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