Change Order / Work Authorization Addendum
Work has already started under an approved estimate and something has changed — a hidden condition was uncovered, the customer added scope, or a material substitution is needed. This addendum documents the change, the cost delta, and the new completion date. Work on the changed scope does NOT resume until this is signed.
Section 1 — Reference to Original Job
Original contract total ($):
Change Order # (1, 2, 3...):
Section 2 — Reason for Change
[ ] Concealed condition — uncovered during work (rot, corrosion, hidden leak, non-code wiring)
[ ] Customer-requested scope addition
[ ] Customer-requested scope reduction
[ ] Material substitution (original unavailable or back-ordered)
[ ] Code-compliance upgrade required by inspector
[ ] Other (describe below)
Detailed explanation of why the change is needed:
Photos documenting the condition / added scope:
Section 3 — Changed Scope of Work
Work being REMOVED / DEDUCTED:
Additional parts / materials (item / qty / unit price):
Section 4 — Price & Time Impact
Additional materials cost ($):
Additional labor cost ($):
Credit back to customer ($, if applicable):
NET CHANGE TO CONTRACT ($, + or −):
REVISED CONTRACT TOTAL ($):
Additional days added to schedule:
Section 5 — Authorization