How to Audit a Time-and-Materials Remodel Overrun

Preserve the original basis

Collect the signed agreement, initial budget, rate schedule, allowances and messages about scope. Identify whether the figure was an estimate, cap or another stated commitment. Do not rewrite the history to match how either party now remembers it. Keep the original files and make a separate working copy for your analysis. See CSLB consumer guidance for the applicable official information.

Create an invoice ledger

Give every invoice a row with date, reference, billed amount, payment and current balance. Then group line items by work area or phase. Identify duplicate numbers, unexplained credits and products you purchased directly. A spreadsheet can expose discrepancies, but an unfamiliar charge is a question to investigate, not automatic proof of misconduct.

Map changes to authorization

For each addition, record the stated reason and any prior written approval. Distinguish owner-requested upgrades from concealed conditions and disputed original-scope items. Include reductions and credits. This allows a focused conversation: which costs are acknowledged, which need documents and which involve a disagreement about the agreement itself.

Ask for a forward forecast

If work remains, request the unfinished scope and expected cost to complete it. An argument over past invoices should not leave the next month undefined. Consider independent professional or legal advice when technical necessity, valuation or contractual rights are in dispute. Do not use a rough online price comparison as proof that billed work was unreasonable.

Turn the overrun into a question-by-question reconciliation

Make a master ledger with original contract amount or stated range, approved changes, billed amounts, payments and current balance. Keep the source document for every number. Do not combine estimates and invoices in one total without labelling them; a forecast is not the same as a charge already incurred. This first pass should establish what the account actually says.

Create a second sheet for questioned entries. Give each a category: possible duplicate, missing receipt, owner-supplied item, rate question, scope question or authorization question. Add the contractor’s explanation when received. A correction in one category should not silently close an unrelated concern. Keeping categories separate helps the conversation move from anger about a percentage to identifiable issues.

For labor questions, ask what records support the billed period and tasks under your agreement. Do not estimate productivity from how many people you happened to see on one visit. For materials, compare orders, delivery information and owner purchases. For subcontractor charges, ask how they are reflected in the contract’s pricing structure. The ledger organizes evidence; it does not establish that every high charge is unreasonable.

For scope disputes, link the relevant original description and proposed or approved change. Where technical necessity is contested, an independent qualified assessment may be more useful than another generic price quote. Ask the professional to state the assumptions and limits of the opinion. Avoid presenting an informal online estimate as an expert valuation.

Close the review with an updated statement showing corrections, agreed items and unresolved amounts. If the project continues, include a remaining-work forecast and the authorization needed for new work. If the parties negotiate a settlement, read all terms before signing and get advice about significant rights. The objective is a reliable account and a documented path forward, not a spreadsheet that appears precise while mixing unverified assumptions with actual charges.

Follow through on the decision

When sending the reconciliation, number the questions and attach only the documents needed to explain each one, while preserving the complete file separately. Ask the contractor to respond by item so corrections are traceable. Do not combine an agreed bookkeeping correction with an unreviewed settlement of all claims. If a response introduces a new invoice or credit, update the master ledger and retain the prior version. Once arithmetic is settled, identify any remaining technical or contractual questions and the professional input needed. This staged approach can narrow a dispute without pretending that every issue is merely accounting. It also gives an adviser a clearer starting point than a single statement that the project is seventy-five percent over budget.

Decision checklist

• Preserve the original agreement, range, rates and supporting communications.
• Separate arithmetic errors from scope, authorization and technical questions.
• Request an updated remaining-work forecast if construction is continuing.
• Document corrections and obtain advice before accepting a broader settlement.

Three different issues in one bill

Hypothetical example. Imagine an invoice includes a duplicated delivery fee, an owner-approved fixture upgrade and an unapproved repair. The duplicate is an accounting question, the upgrade needs reconciliation with its approval, and the repair raises scope and authorization issues. Separating them can resolve part of the balance quickly without pretending the entire invoice has one legal or factual answer.