Sources
Every claim, sourced and dated.
Every rule, cost, and rebate we cite has a link and a date. We re-check monthly. If something changes, the date below will tell you.
All sources last re-verified 2026-05-07
BAAQMD + CARB regulatory
Primary regulatory sources for Rule 9-6 and California building decarbonization standards.
Rebate programs
Federal, state, and Bay Area-local rebate programs we surface in calculator results.
Contractor licensing
California Contractors State License Board (CSLB) sources for verifying contractor licenses, classifications, and disciplinary records.
Spot a stale or broken citation? Email us at hello@switchboardhome.com. Source list maintained by the Switchboard Home content team.