What Every Purchase Order Approval Should Contain Before It Becomes a Commitment

Most PO problems in construction start before the supplier ever sees the order.

They start at the point of approval, when someone is asked to sign off a commitment but has not been given enough context to judge it properly. The result is familiar: an order gets approved because the value looks fine, but the job reference is loose, the scope is unclear, or the exception that triggered the order was never written down.

That creates trouble later. Site assumes the order is live. Accounts expects the cost to be clean. Commercial thinks the approval was explicit. Then the invoice arrives and the business has to rebuild the story from messages, memory, and guesswork.

A good PO approval should prevent that.

Why PO approval matters before the order is live

A purchase order is not just an admin form. It is the point where the business commits money.

If approval is weak, the commitment can be wrong even when the number is right. A £4,800 order can still be bad if it is coded to the wrong job, tied to the wrong scope, or approved without the variation that caused the spend in the first place.

That matters because PO approval affects:

• job costing
• supplier expectation
• invoice matching
• cash flow control
• director oversight

If the approval record is incomplete, the business is not controlling spend. It is merely recording that someone clicked yes.

The approver needs more than a value

An approver should never be asked to sign off a number on its own.

Before approval, they should be able to see:

• the correct job or site reference
• the supplier or subcontractor name
• the description of what is being bought
• the value or rate basis
• the reason the spend is needed now
• any variation or exception behind the order
• who raised it
• who will check the invoice later

If that information is missing, the approver is being asked to guess. In construction, guessing at the point of commitment usually becomes rework later.

Keep the scope and the reason together

The biggest approval mistake is to separate the scope from the reason for the spend.

For example, a PO might say:

• "additional plasterboard"

That is not enough on its own. The approver also needs to know:

• why it is needed
• which area it belongs to
• whether it is part of the original package or a change
• whether the extra value is already reflected in the budget

Without that context, the order might be technically correct but commercially opaque.

Construction approvals should tell the story, not just the number.

Give the approver one clean question to answer

A good approval workflow asks a single practical question:

Is this a valid commitment for this job, at this value, for this supplier, with this scope?

If the answer is yes, approve it.

If the answer is no, the order should go back for correction before it becomes a live commitment.

That is better than approving first and sorting the details later, because later usually means after the supplier has started work and the invoice has already landed.

What makes an approval risky

Some approvals need more care than others.

The warning signs are usually the same:

• the order is above the usual value threshold
• the work relates to a variation
• the job reference is vague
• the supplier is new or not yet set up properly
• the value is based on an estimate rather than an agreed price
• the approval came by phone or chat rather than in the record
• the person approving cannot see the original request

If any of those apply, the order should not be treated like a routine click-through.

Keep approval levels simple

Small and mid-sized contractors do not need a complicated governance chart to improve PO approvals.

They do need clear rules such as:

• routine orders can be approved by the project lead or commercial lead
• over-threshold orders need director review
• variation-related orders must include the change note
• any missing job reference must be resolved before approval
• any exception to normal supplier or rate terms must be visible

That keeps the process moving without turning every decision into a director-only task.

Why approval and dispatch are different

An approved PO is not the same thing as a sent PO.

The first approves the commitment. The second tells the supplier to act on it.

If the business does not keep those steps separate, it can end up with:

• a commitment that exists only internally
• a supplier waiting for paperwork that was never issued
• an invoice arriving before the supplier even received the order
• a job starting from a verbal instruction that never made it into the record

Approval is a commercial decision. Dispatch is an operational action. Both need to be visible.

Make exceptions visible before they become problems

Approvals work better when exceptions are captured at the point of sign-off.

Useful exception notes include:

• variation pending
• estimate only
• job reference to be confirmed
• supplier to be issued after approval
• value subject to site measure
• split between two jobs

If the exception is written down, accounts and site can still understand the commitment later.

If it is left in someone’s head, the invoice check becomes a search party.

What accounts should expect to see later

The approval record should give accounts enough context to match the invoice without phoning the job team first.

That means the PO should still show:

• who approved it
• when it was approved
• what value was approved
• what the order relates to
• whether there was an exception
• whether the order changed later

If accounts has to reconstruct those basics from different systems, the approval workflow is too loose.

A practical approval checklist

Before signing off a PO, check:

1. The job reference is correct and specific.
2. The supplier or subcontractor name is right.
3. The scope is clear enough to match the work.
4. The value is within the expected limit or has escalated properly.
5. Any variation or exception is visible.
6. The approver can see who will receive and action the order.
7. The invoice checker will later have enough context to match the cost.

If any of those steps fail, the order should go back for clarification.

How BuilderDash helps

BuilderDash helps construction businesses keep the approval basis, job reference, and purchase order together in one workflow.

That matters because the approval is no longer a vague green light buried in email. It becomes a controlled record that site, commercial, and accounts can all use later. The business can see what was approved, why it was approved, and what should happen next.

Suggested internal links

• What to Do When an Approved Purchase Order Never Reaches the Supplier
• Why Directors Should Not Be the Accounts Approval Bottleneck
• What Construction Businesses Should Standardise Before Automating Accounts
• What to Do When a Purchase Order Needs Revising Mid-Job

Call to action

If your PO approvals still rely on memory, forwarded messages, and a quick yes to a number, tighten the approval record before the commitment is live. BuilderDash helps keep the scope, job reference, and exception trail together so sign-off is actually useful when the invoice arrives.