What Is a Work Order? And Why Yours Gets Rejected
A work order is the authority to do the work — who approved it, up to what value, against which reference. Get the number wrong on a commercial job and the invoice comes straight back.
A work order is the document that says work is authorised. Not what it costs, not what happened on site — just that someone with the authority to spend the money has said go, and up to what limit. On residential work you'll rarely use the phrase. The moment you start subbing to builders, servicing strata, or picking up jobs from property managers and facilities companies, it becomes the single most important piece of paper in the job, because an invoice without a valid work order reference doesn't get paid. This guide covers what a work order actually is, how it differs from the documents you already use, and what to check on one before you turn up.
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What a work order actually is
A work order is an authorisation. It exists to answer one question: is this work approved, and by whom? Everything else on it — the description, the site, the dates — is there to make the authorisation specific enough to rely on.
That's why work orders come with numbers and approval limits and the name of a person. The number is what the client's accounts system matches your invoice against. The limit is how much you're allowed to spend before you have to ask again. The name is who carries it if the spend was wrong.
- Work orders you receive — from a builder, a property manager, a strata manager, a facilities company or a real estate agent. They're instructing you, and their reference number is the condition of getting paid.
- Work orders you issue — to your own subbies, so the scope, the cap and the timeframe are in writing before they mobilise.
- Internal work orders — the instruction that turns an accepted quote or a service call into a job the crew can be sent to.
The distinguishing feature is the approval limit. A quote is a price you're offering; a work order is a spend someone else has already agreed to. If the document you're holding doesn't say who authorised it and up to what value, it isn't functioning as a work order, whatever it's called.
Work order, job sheet, scope, quote
These four get used interchangeably, and mixing them up is how work gets done without anyone having agreed to pay for it. They answer different questions:
| Document | The question it answers |
|---|---|
| Quote | What will this cost, and will you accept that price? |
| Scope of work | What's included in that price, and what isn't? |
| Work order | Is this work authorised — by whom, and up to what value? |
| Job sheet | What actually happened on site — hours, materials, variations, sign-off? |
| Invoice | What's now payable, and against which authority? |
In a small residential business those five collapse into two documents and nobody suffers. In commercial and property work they stay separate on purpose, because different people sign each one, and the person approving the spend is usually not the person who lets you into the building.
The practical consequence: your job sheet records what you did, but your work order is what makes it billable. Doing work that's on the job sheet and not on the work order is the fastest way to spend a day for free.
What belongs on a work order
| Field | Why it's there |
|---|---|
| Work order number | The reference your invoice must quote. Without it, accounts can't match the invoice to an approval |
| Who authorised it | Name, position and contact. The person you ring when the job turns out bigger than the order |
| Client and billing party | Often not the same — a managing agent orders it, the owner or the body corporate pays |
| Site address and access | Unit number, gate code, key collection, who's meeting you, permitted hours |
| Description of work | What's authorised, specifically. "Investigate leak" and "repair leak" are different approvals |
| Approval limit | The dollar cap. Exceed it without written variation and the excess is yours |
| Priority and dates | Response time and completion date, especially where an SLA applies |
| Rates or agreed price | Whether it's a fixed sum or your agreed schedule of rates |
| Required paperwork | SWMS, permits, inductions, certificates of currency, compliance certificates on completion |
| Invoicing instructions | Where to send it, in what format, and what has to be attached |
The approval limit and the description do the real work. Almost every unpaid commercial job traces back to one of two things: work done beyond the cap, or work that doesn't match what the order described.
Work orders you receive: what to check before you go
Two minutes on the order before you drive out saves the argument that happens six weeks later when the invoice bounces.
- Check who's actually paying. The agent or facilities company issuing the order may not be the entity that pays it. Invoice the party the order tells you to invoice, exactly as named.
- Read the limit. If it's an attend-and-assess order with a small cap, that's all you're authorised to do. Attending, diagnosing and then fixing it because you were already there is unpaid work unless someone varied the order.
- Check the scope wording matches the actual problem. Orders are often written by someone relaying a tenant's phone call. If the fault isn't what the order says, ring before you start, not after.
- Note the paperwork conditions. Site induction, permit to work, SWMS, insurance currency. Turning up without them wastes the trip, and some clients won't pay for a wasted trip they didn't cause.
- Confirm the invoicing requirements. Portal or email, order number on the invoice, photos or a signed docket attached. Getting this wrong is the most common cause of a commercial invoice sitting unpaid for months.
When the job turns out bigger than the order, stop and get a variation to the order in writing before continuing. A text message from the person named on the order is worth more than a verbal go-ahead from someone on site, and it takes about the same amount of time to get.
Work orders you issue to subbies
If you're sending someone else to do work you're responsible for, the same document protects you in the other direction. A subbie work order should say:
- The scope, in the same words you gave the client, so there's no gap between what you sold and what gets built.
- The price or rate, and a cap. Anything beyond it needs your written approval first.
- The site rules and paperwork — inductions, SWMS, licences, insurance, and what you need back at completion.
- What you need before you'll pay — certificates, photos, a signed job sheet. Say it at the start, not when their invoice arrives.
- Your own order number, so their invoice matches your job and lands against the right client.
ServiceYak keeps the client's reference, the approved scope and the job's own record together, so the invoice you send carries the number the client's system is looking for and the evidence they'll ask for is already attached to the job.
Frequently asked questions
What's the difference between a work order and a job sheet?
A work order authorises the work before it happens — who approved it, for what, up to what value. A job sheet records what happened while you were there: hours, materials, variations and sign-off. You need both on commercial work, because the work order is what makes the job billable and the job sheet is what proves what you did.
Is a work order the same as a purchase order?
Close enough in practice, and plenty of clients use the terms interchangeably. A purchase order is usually the accounting side — the reference the client's system raises so the spend is committed and your invoice can be matched to it. A work order is the operational instruction. On many jobs one document does both; what matters is that you quote the number they gave you on your invoice.
Do I need work orders for residential jobs?
Not usually. An accepted quote plus a job record does the same work with less paperwork. Work orders start earning their keep the moment there's a third party in the chain — a builder, an agent, a strata manager — because then the person authorising the spend isn't the person you're standing in front of.
What do I do if the job is bigger than the approved amount?
Stop at the limit and get a written variation from the person named on the order before you go further. Make the ask specific — what you found, what it takes to fix, what it costs — so they can approve it without a site visit. Work done above the cap without that is work you may well end up donating.