Why Labour-Only Invoices Should Not Reach Accounts Without a Timesheet

Labour-only invoices often look simple on the surface. A subcontractor submits hours, a rate, and a total, and the office expects the paperwork to be straightforward.

In practice, that is exactly where the control problem starts. If the invoice arrives without a timesheet, daywork sheet, or signed site record, accounts has to work backwards from the number. That is a poor way to manage cost on a live construction job.

The answer is not to slow every payment down. It is to make the labour record strong enough that the invoice can be checked in minutes rather than chased for hours.

Why labour-only invoices need a separate check

Labour-only work is different from a materials invoice.

With materials, the business can often compare the invoice to a PO, delivery note, or quantity. With labour, the evidence is usually a timesheet, daywork sheet, site sign-off, or supervisor approval. If that evidence is missing, the office cannot easily tell whether the claimed hours are right.

That matters because labour-only costs can drift in small ways:

• extra hours added at the end of a shift
• weekend work that was agreed informally
• overtime charged at the wrong rate
• standby time mixed in with productive time
• a different crew or date range being billed under the same job

None of those issues is unusual. The problem is letting them reach bookkeeping before anyone checks the support behind them.

What the timesheet should show

A useful labour record does not need to be complicated. It just needs to be specific.

At minimum, the timesheet or daywork sheet should show:

• subcontractor or labour supplier name
• job or site reference
• date or date range
• worker name, gang, or crew
• start and finish time, or total hours
• normal hours and overtime if they are billed differently
• agreed rate or daywork basis
• work carried out
• who signed it off on site

If a timesheet only says “labour” and a total value, it is not much better than a guess.

The approval needs to sit beside the hours

A timesheet is only half the record. The approval matters just as much.

On a busy job, labour can be authorised by different people depending on the situation: a site manager, project manager, foreman, or commercial lead. That is fine, provided the approval is visible later.

The office should be able to see:

1. who requested the labour
2. who approved it
3. whether the hours were planned or reactive
4. whether the rate was agreed in advance
5. whether anything changed on site

If the approval is only in a text message or a phone call, the invoice check becomes unnecessarily fragile.

Common failure points

Most labour-only invoice problems come from the same small set of mistakes.

• The job reference is missing or vague.
• A timesheet is signed, but the invoice covers a different period.
• Overtime is billed without a separate approval.
• A weekend call-out is treated as ordinary labour.
• Two people sign off the same work in different places.
• The office receives the invoice before the site record.

When that happens, accounts ends up chasing for context instead of processing a clean record.

That delay is not just annoying. It affects cash flow, job cost accuracy, and the relationship between site and office.

Keep labour and materials separate where it helps

Some packages mix labour, small materials, and hire into the same claim. That may be workable on site, but it is harder to control once the invoice arrives.

Where possible, keep the labour record clear enough to answer one question: what hours were actually approved?

If the invoice also includes materials or extras, those should be visible as separate lines or separate support so the office can check them properly.

That is especially important when the same subcontractor is working across more than one job. A vague labour invoice can be coded to the wrong project and still look plausible in accounts.

How to review a labour-only invoice before posting it

Before the invoice reaches bookkeeping, the review should confirm:

• the job or site reference matches the work
• the labour hours match the signed timesheet
• any overtime or weekend work was approved
• the rate matches the agreed basis
• the date range is correct
• the invoice is not repeating a previous claim
• any disputed hours are clearly separated

If one of those checks fails, the invoice should be queried, not quietly posted.

That protects both the contractor and the subcontractor. It also makes the next conversation much easier because the question is specific.

How BuilderDash helps

BuilderDash helps keep the labour record tied to the commercial record.

That means the business can keep the job reference, approval status, and invoice check together instead of leaving timesheets in one place and the invoice in another. The office can see what was agreed, what was signed on site, and what is ready to pay.

For small and mid-sized contractors, that is the practical win: fewer missing documents, fewer approval loops, and fewer surprises when the invoice lands.

Suggested internal links

• What a Clean Subcontractor Invoice Workflow Looks Like
• Why PO Approval Status Should Be Checked Before a Subcontractor Invoice Is Paid
• What to Check Before a Construction Payment Run
• Why Project Codes and Site References Matter on Materials Invoices

Suggested call to action

If labour-only invoices still depend on memory, WhatsApp, or a signed sheet that lives in somebody’s van, BuilderDash can help keep the timesheet, approval, and invoice check in one place before the cost is posted.