Managing subcontractors, progress billing and retentions

In most contracting businesses, projects rarely fail because of poor engineering or lack of technical skill on site. They struggle because cash flow dries up. A project starts with an optimistic budget and a clear schedule, but after a few months, subcontractor claims arrive, material bills mount, and client progress payments lag behind, leaving the contractor to fund site work out of pocket.

This breakdown usually happens when accounting operates in isolation from actual site progress. When subcontractors submit invoices based on rough guesses, and when the main contractor bills the project owner without verifying measured quantities or contract retentions, the approval chain stalls and cash collections stop for weeks.

Where contractors wait for money

Cash flow troubles begin the moment actual field costs disconnect from approved billings. In construction projects, subcontracted packages represent a substantial portion of overall project expenditure. If a general contractor pays subcontractors before field measurements are checked and verified, money leaves the business before it can be certified and collected from the project owner.

There are four common bottlenecks where construction cash flow grinds to a halt:

• Unverified subcontractor claims: Subcontractors submit payment requests based on estimated completion, triggering weeks of debate between project engineers and finance while waiting for physical measurements.
• Delayed client progress approvals: Invoices submitted without clear quantity measurement sheets or advance deduction calculations get rejected by supervising consultants, restarting the review cycle.
• Unapproved variation orders: Extra work requested verbally by the owner's site representative proceeds without a formal change order, leading to payment refusals when the invoice arrives.
• Forgotten retention releases: Subcontractor retentions sit in limbo without reconciliation, and the owner retains the contractor's warranty funds long past the contractual maintenance period because nobody tracked release dates.

Tip: Never proceed with site variations based solely on a phone call or verbal instruction, and always secure a signed, priced variation order so the work can be billed on the next progress certificate.

Project financial documents in order

Maintaining predictable cash flow requires linking site engineers, the technical office, and accounting through a disciplined document sequence. Contracting cannot run reliably on disconnected spreadsheets or informal messaging apps, because any missing paperwork delays cash collection or creates unapproved liabilities.

A reliable document workflow for construction projects moves through five connected stages:

1. Subcontract agreement and work order: Defining detailed bill of quantities (BOQ) items, unit rates, and the agreed retention percentage withheld from each progress payment.
2. Measurement sheet and site inspection: Verifying physical quantities completed on site with the supervising engineer before generating any financial document.
3. Subcontractor progress certificate: Converting measured quantities into a certified payment request that automatically applies retention deductions against the allocated budget code.
4. Client progress certificate: Consolidating verified progress across all project items, deducting advance payment amortizations, and withholding agreed contract retentions.
5. Invoice generation and accounting entry: Posting the approved certificate directly into accounts receivable and forecasting expected collection dates.

This structured workflow connects closely with project costing for contractors. Accurate bidding and protected margins depend directly on reliable data recorded at each of these stages.

Managing variation orders and retentions

Variation orders are among the highest financial risks in contracting if their cost impact is not recognized immediately. Whenever a client requests design modifications or additional structural items, that scope must be recorded as a formal variation order with agreed quantities, rates, and schedule adjustments. This enables the project team to capture extra costs, bill them on the next client progress certificate, and update project budgets without delay.

Retentions, on the other hand, represent a contractually withheld percentage from every certified payment to guarantee quality through preliminary and final handover. The management challenge lies in tracking retentions on both sides of the balance sheet:

• Client retentions withheld from the contractor: Requiring a precise record of amounts deducted from each progress certificate and their scheduled release dates upon project handover.
• Contractor retentions withheld from subcontractors: Requiring identical discipline to hold agreed percentages until the subcontractor's work is inspected, accepted, and cleared of defects.

Gaining control over these retentions gives management clear foresight into future cash movements and prevents overpaying subcontractors before the supervising consultant accepts the works. It ensures that the company retains adequate working capital throughout the project lifecycle.

How MG Build helps

The MG Build construction and contracting system provides a single digital environment that connects site engineers, project managers, and finance teams. It allows contracting businesses to oversee operations and finances in a regional cloud or on-premise setup, with full Arabic and English support.

• Subcontractor payments: Subcontract orders, work certificates, and payments checked against the work actually done before anything is approved for payment.
• Progress certificates: Measured quantities become client invoices with completion percentages calculated, while tracking retentions and advance payments on every certificate.
• Live budget control: Committed and actual costs tracked for every cost code, with automated alerts before project budgets are overrun.
• Cash forecast: Expected client receipts and supplier or subcontractor payments projected for the weeks ahead in a clear overview.
• Accounting & financial reports: Every sale, purchase, payment, and certificate lands in your accounts without re-typing, supporting KWD to 3 decimals, amounts in words, and GCC VAT readiness.

Transitioning to structured progress billing and retention tracking protects project margins and gives you full visibility over cash flow at every stage. Connecting site measurements directly with accounting avoids disputes with project owners and subcontractors. You can book a free 45-minute demo to see how the system supports your contracting projects and team.