The short answer
A window-project change order should identify the opening, the condition or requested change, why the original scope no longer applies, the revised work and product, price and payment effect, schedule effect, warranty impact, and approval by the authorized parties before extra work begins. Photograph concealed conditions and distinguish required corrective work from optional upgrades.
Common triggers
- Concealed rot, water damage, framing movement, or missing water-management details exposed during removal.
- Existing dimensions or conditions that differ materially from the documented assumption.
- Owner-requested product, finish, grid, hardware, or scope changes after approval.
- Local review or permit requirements that add documented work.
- Lead-safe containment or related work not included in the original assumptions for applicable pre-1978 painted surfaces.
Stop at the affected scope
Protect the opening and avoid covering the condition before it is documented.
Record the evidence
Use photographs, measurements, and a plain-language description tied to the opening identifier.
Present options
Separate work needed to continue from optional improvements or broader repairs.
Price and schedule the revision
State additions, credits, payment timing, product changes, and schedule effect.
Approve in writing
Use the contract's authorized change process before proceeding.
Common questions
Common questions
Should a provider proceed with extra work based only on a verbal discussion?
Sources
Sources
- How to Avoid a Home Improvement Scam — Federal Trade Commission
- Window Installation — U.S. Department of Energy
- Renovation, Repair and Painting Program for Consumers — U.S. Environmental Protection Agency
- Renovation, Repair and Painting Program for Contractors — U.S. Environmental Protection Agency