Check the original obligation before calling work extra
When a contractor reports a change, first compare it with the signed scope, drawings and allowance schedule. Identify what has actually changed: a newly discovered condition, an owner selection, a design revision or an operation that was already included. Ask for the reason and supporting information. An unexpected invoice does not by itself establish that the work was outside the agreement.
Record the issue even while its price or responsibility is being resolved. Describe the affected location and any temporary protection or safe stopping arrangement needed. If an immediate hazard is involved, use the appropriate qualified help and emergency process; do not allow an administrative approval exercise to delay necessary safety action. Keep the facts and commitments documented.
Define the whole change, including work removed
A useful change order identifies the original agreement, the revised work, drawings or products, price additions and credits, applicable tax, schedule effects and payment milestones. It also records the parties’ approval. If a new product replaces an allowance, show the original included amount and the difference rather than charging the entire new selection again.
The California CSLB contract page says changes to price or scope need a written change order signed by the customer and contractor before the change. The CSLB contracting guide also addresses deletions and payment-schedule effects. These are California examples; check the contract and local requirements for work elsewhere. A project-app note alone should not be treated as the other party’s signature.
A worked register with one current agreed price
| Record | Amount |
|---|---|
| Original signed work | 48,000 |
| CO-01: additional defined plumbing work | 3,600 |
| CO-02: net product-selection upgrade | 1,400 |
| CO-03: agreed credit for deleted closet work | −900 |
| Current agreed work | 52,100 |
| Payments recorded to date | 27,500 |
| Arithmetic unpaid balance | 24,600 |
| Unallocated reserve after the net changes | 3,100 |
| Original funding provision | 55,200 |
The approved net change is $3,600 + $1,400 − $900 = $4,100. Work becomes $52,100 and the unallocated reserve falls from $7,200 to $3,100. Their sum remains $55,200. The reserve is part of the owner’s funding plan, not a contractor debt or proof that cash is in the bank.
Separate cost, payment and the amount now due
The example’s $27,500 paid consists of a $1,000 down payment and progress payments of $14,500 and $12,000. The current agreed cost remains $52,100, so the arithmetic unpaid balance is $24,600. Whether any of that balance is due now depends on the agreement, completed work, proper billing and applicable legal requirements.
CSLB’s consumer guide describes California’s ordinary down-payment limit as the lesser of $1,000 or 10% and identifies a qualifying blanket-bond exception for some licensees. Its progress-payment requirements also matter. A large product order is not automatically a basis for collecting an otherwise impermissible advance. Do not apply California’s rules as a national payment schedule.
Reconcile cumulative invoices before recording a new payment
Suppose a later valid invoice states $43,000 billed to date, including the same approved changes, and credits the $27,500 already paid. The new amount requested is $15,500. If that amount is properly due and paid, cumulative payments become $43,000 and the arithmetic balance of agreed work becomes $9,100. Recording $43,000 as a new payment would count earlier payments twice.
Also check whether the invoice is cumulative or for the current period only. Match invoice identifiers and payment references, review product credits and confirm whether a deposit has already been applied. A change order approves a price adjustment; it does not prove the associated work is complete or the invoice has been paid. Keep those records connected without adding all three amounts together as separate costs.
Show proposed work without silently approving it
| Status | Effect on the register |
|---|---|
| Proposed | Record expected cost and decision date; not yet part of signed work |
| Under investigation | Track the authorized investigation separately from an unapproved repair |
| Approved | Update agreed cost and the relevant reserve or funding decision |
| Invoiced | Check the payment trigger and reconcile previous billing |
| Paid | Record the actual amount and date once; retain the payment evidence |
| Credited or canceled | Document the agreed reduction and any real restocking or other charges |
If another $2,800 proposal arrives, it is not yet part of the $52,100 signed work. Show the potential exposure separately. If later approved and funded from the existing reserve, work would become $54,900 and unallocated reserve would fall to $300. That is the point to reassess remaining risks and optional scope, rather than continuing to describe the reserve as untouched.
Keep tax, releases and completion conditions distinct
Actual tax details must follow the property and contract rules. Washington’s custom-construction guidance, for example, requires separately stated retail sales tax and calculates it before deducting contractual retainage. That rule illustrates why a funding-summary total is not a universal invoice format. Ask the contractor for the correct documentation for your state.
Payment also does not automatically resolve every potential lien claim. CSLB’s California release guidance distinguishes conditional and unconditional releases and warns that paying the general contractor does not prove subcontractors and suppliers are paid. Coordinate the relevant documents with actual payment and qualified advice where needed; do not assume a generic receipt has the same effect.
FTC consumer guidance encourages written estimates and a reviewed contract. Maintain that same discipline during work: a dated approved change, a clear scope and an understandable payment record. Review these alongside the schedule at each material decision so that a small signed upgrade does not conceal a larger funding problem.
Sources and scope
- California Contractors State License Board — Learn about home improvement contracts
- California Contractors State License Board — Terms of Agreement: consumer contract guide
- California Contractors State License Board — Contracting for Success
- California Contractors State License Board — Conditional and unconditional waiver and release forms
- Washington Department of Revenue — Custom construction
- Federal Trade Commission — Home repair scams
Sources reviewed on 18 October 2026. Dollar amounts are USD. Worked budgets, reserves and scheduling examples are editorial illustrations, not local bids, national price averages or prescribed allowances. State and city examples are identified; requirements depend on the property, contract and jurisdiction.