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A formal written amendment to an existing contract that modifies scope, cost, or schedule. Subcontractors should never perform out-of-scope work without a signed change order. Undocumented changes are a leading cause of unpaid invoices and disputes.

Expenses already built into a contract rate that cannot be billed separately, such as mobilisation, PPE, or overhead. Subcontractors must identify these upfront to avoid absorbing unrecovered costs. Missing embedded costs during bid review is a common source of margin loss.

Materials or equipment stored at your job site but owned by the supplier until you use them. You only pay when items are consumed, reducing upfront capital tied up on remote projects. Common for frequently used consumables like fittings, gaskets, and PPE on long-duration field contracts.

Materials, labour, and equipment costs tied to commercial and industrial construction projects. Subcontractors track these input costs to price bids accurately and protect margins. Rising input costs can erode fixed-price contract profitability quickly.

A contract where your payment depends on meeting specific targets, such as uptime, output, or safety metrics. Underperforming against those benchmarks can trigger penalties or reduced fees. Subcontractors must track KPIs closely to protect their margins.

A contract exhibit listing approved subcontractor rates, markups, and reimbursable costs. It governs what you can invoice and at what price. Disputes over billing often trace back to misreading this schedule.

What Happens to Subcontractor Billing When a Project Stalls, Goes Over Budget, or Never Gets Commissioned

You did the work. The project was cancelled, shelved, or never activated. Here is what subcontractors need to know about billing rights, legal remedies, and how to get paid when no one wants to discuss the invoice.

Post-Completion Warranty and Punch Work: Protecting Your Margins After the Job Ends

Warranty walks, punch lists, and post-completion callbacks eat into subcontractor margins. Learn how MSA warranty clauses work, when you can push back on mobilization costs, and how to document your way out of disputes.

Mechanic's Lien Rights for Subcontractors: What to Do When You're Not Getting Paid

A practical guide to mechanic's lien and materialman's lien rights for oilfield and construction subcontractors in Texas, Oklahoma, and Alberta — deadlines, filing steps, and leverage tactics.