Change Orders for Hidden Conditions: What to Confirm Before Approving Extra Work

First identify what actually changed

A contractor may uncover a condition that nobody could reasonably see during the estimate. An owner may also request a different finish or additional room. Those situations are different from a contractor discovering that its original price omitted work already included in the agreement. Start by identifying which situation is being presented.

Ask for the original scope reference, the affected location and the new fact. Useful wording is: “Please show the condition, explain the work now proposed and identify what was excluded or unknown in the agreed scope.” That question invites an explanation rather than an argument over whether all extra charges are suspicious. Keep the response with the original contract and drawings.

Document the discovery while it can still be seen

Record the date, exact area, photographs and the person who observed the condition. Include enough surrounding context to locate a close-up image. A short note explaining what became visible after opening or excavation can be more useful than a large folder of unlabeled pictures.

Distinguish observations from interpretations. “An unexpected material was exposed at this location” is an observation; “the entire foundation is failing” is a conclusion requiring appropriate support. Ask whether the designer or another qualified professional needs to evaluate the condition. Preserve important evidence, but do not insist that unsafe exposure remain unchanged merely to obtain better photos. Necessary protective steps should be documented separately.

Separate protection from the proposed permanent solution

An open excavation, disconnected service or exposed structure may require prompt attention. Ask what work must pause, what area must remain inaccessible and which temporary protections the responsible professionals consider necessary. A time-sensitive situation should not become a blank authorization for every permanent repair the contractor proposes.

Clarify who can authorize immediate action and how costs will be recorded under the agreement. If the situation involves an immediate threat to occupants, use the appropriate emergency or professional response. For nonemergency work, request a defined proposal and a reasonable opportunity to understand it. The scope and urgency of the actual condition should control the decision, not a generalized claim that everything must be signed today.

Make the price adjustment mathematically clear

Scroll horizontally to read every column.

Ask for the change amount and revised contract total, not just a new “all-in investment.” A credit for deleted work should be visible so the owner can see what is being replaced rather than paying for both versions.

Check whether design or permit review comes first

A customer's approval of cost does not replace a design professional's approval of a technical change or the building department's required review. Ask whether the new work affects approved drawings, required inspections or another trade's scope. Keep the revised document identified by date and revision.

For example, San Jose provides a revision service for changes to permitted plans. The applicable process depends on the project and jurisdiction. A contractor's field sketch may explain a proposal, but it does not necessarily establish authorization to build it. Record who will obtain the required review and what happens to the schedule while it is pending.

Understand California's written-change rule accurately

For covered California home improvement contracts, CSLB explains that scope or price changes should be signed in writing before the changed work. The current Business and Professions Code section 7159, reviewed October 3, 2026, describes scope, price and schedule information and also preserves possible legal or equitable recovery despite noncompliance.

That qualification matters. “There was no signed change, so you owe nothing” is too categorical. Equally, an invoice alone does not settle whether the owner approved the extra work or whether it was already included. Preserve the records, request a reasoned reconciliation and obtain legal advice if the dispute cannot be resolved. Do not substitute forum comments for a case-specific conclusion.

A hypothetical change that should include a credit

Suppose the original basement contract includes removal and replacement of one finish assembly. After opening it, the owner selects a different approved assembly that requires extra work. The contractor proposes the full price of the new assembly. The review should also ask what original work or material is no longer required and whether the original amount has been credited.

The final change might contain both an addition and a deduction, with a net adjustment. If required engineering review delays the next inspection, its schedule effect belongs in the same decision record. This does not mean the owner is entitled to a guessed credit based on retail prices. It means both parties should understand and document the exchange they are approving.

Do not approve an unanswered bundle

A proposed change may combine several decisions: a required correction, an optional improvement and a finish selected by the owner. Ask for those components separately when they have different urgency or value. Otherwise declining the optional item may appear to mean rejecting a necessary correction, or the owner may approve an expensive bundle simply to restart the crew.

If information is missing, record exactly what is pending and who will supply it. For example, the designer may need to confirm a revised detail while the contractor obtains a supplier lead time. Agree a response date and the activities affected by the delay. This is more constructive than an open-ended instruction to stop everything, and clearer than allowing work to proceed while both sides assume the other will absorb the consequences.

When the parties disagree about whether the work was originally included, preserve both positions in writing. Ask for the contract language and the facts supporting the claimed exclusion. A negotiated resolution can identify the payment and completion arrangement without requiring either side to make broad admissions about the whole project. Obtain professional advice when the proposed settlement or release could affect significant rights.

Keep one cumulative register throughout the job

Number changes and show their status: proposed, awaiting information, approved, rejected or completed. Record the authorized amount and any adjustment to remaining payments. Keep related emails and revised documents linked to that entry. When an invoice arrives, reconcile it to approved changes rather than reopening the whole project history.

In a California basement contract discussion, the concern centered on cumulative totals and how later work related to an earlier agreement. A running register addresses that specific confusion. It also makes disagreements narrower: the parties can examine one scope item and one authorization rather than debating whether the entire project was fair.

Before your next decision

• Identify the new fact and original scope reference.
• Preserve dated, located evidence of the discovery.
• Separate immediate protection from permanent additions.
• Show credits, net adjustment and revised balance.
• Record design, permit, schedule and payment consequences.