A written, signed change order is important because it:
Explanation
A signed change order fixes the added scope, the price for it and any schedule effect before the extra work starts, which is what preserves the right to be paid for it; on a home improvement contract B&P §7159 requires the change to be in writing and signed. It modifies the contract rather than cancelling it, and the original terms continue to govern everything else. Material tax follows the purchase, not the paperwork. And added scope may well require a permit amendment rather than excusing one.
Law Reference: Bus. & Prof. Code §7159(c)(6)This topic, taught in full in the CSLB Law & Business guide. CSLB Law & Business — Complete Study Guide (2026) — PDF + EPUB, $24.99 · 14-day refund →
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