Variation Claims in Construction: How to Protect Yourself

What is a Variation in Construction?

A variation is any change to the original scope of work defined in your contract. It could be:

• Additional work — something not in the original scope (e.g., an extra partition wall)
• Changed work — doing the same work differently (e.g., upgrading from standard plasterboard to fire-rated)
• Omitted work — scope being removed (which should reduce the contract value, but might also affect your fixed costs)

Variations are completely normal. On any project of decent size, the final scope will be different from what was tendered. The issue isn't that variations happen — it's that subbies often do the work without proper documentation, and then don't get paid for it.

Why Variations Cause So Many Disputes

Variations are the single biggest source of payment disputes in construction. Here's why:

• Verbal instructions: The foreman says "just do it, we'll sort it out later." Later never comes.
• Unclear scope boundaries: Is that extra work a variation, or was it always in scope? Both sides have a different view.
• No written approval: The work gets done, but there's no signed variation order, so the builder refuses to pay.
• Disagreement on value: You say the extra work is worth $8,000; the builder says $3,500.

Your Rights Around Variations

Your rights depend on your contract and the applicable legislation. But here are the general principles that apply across Australia:

You Can't Be Forced to Do Free Work

If the builder directs you to do work that's outside your contract scope, you have a right to be paid for it. This applies even if there's no signed variation order — the law generally recognises that if you were directed to do extra work and did it, you're entitled to reasonable compensation.

The Contract Usually Sets the Process

Most subcontracts have a variation clause that specifies:

• How variations must be directed (usually in writing)
• How you should submit a variation claim (including cost breakdown)
• The timeframe for submitting variation claims
• How variations are valued (contract rates, cost-plus, or negotiated)
• Who has authority to approve variations

Follow the contract process, even if the builder doesn't. If the contract says variations must be submitted within 14 days of the direction, submit within 14 days. If the builder verbally directed the work, confirm it in writing immediately and then submit a formal variation claim.

SOPA Covers Variation Claims

Under the Security of Payment Act, you can include variation claims in your payment claim — even disputed ones. The builder can reject them in their payment schedule, but if you disagree, you can take it to adjudication. The adjudicator will assess whether the work was a variation and what it's worth.

How to Submit a Variation Claim Properly

Getting your variation claims right from the start saves massive headaches down the track. Here's the process:

Step 1: Identify the Variation Immediately

As soon as you're asked to do something that's not in your contract scope, flag it. Don't wait until the end of the month. Send an email on the spot:

"Hi [Builder], as discussed on site today, you've requested that we [description of extra work]. We consider this a variation to our subcontract and will submit a variation claim for the additional cost. Please confirm your direction to proceed."

This does two things: it creates a written record of the direction, and it puts the builder on notice that you expect to be paid.

Step 2: Get Written Approval Before Starting (If Possible)

Ideally, you want a signed variation order before you start the extra work. In practice, this doesn't always happen — the builder might need the work done urgently. But at minimum, get written confirmation that the work has been directed, even if the price isn't agreed yet.

Step 3: Document Everything

For every variation, keep:

• Photos: Before, during, and after the variation work
• Timesheets: Hours spent on the variation (if it's day-work or cost-plus)
• Materials receipts: What materials were used and their cost
• Emails/messages: Any correspondence about the variation
• Drawings/markups: If the variation involves design changes, annotate the drawings

Step 4: Submit a Formal Variation Claim

Your variation claim should include:

• A unique variation number (e.g., VO-001, VO-002)
• A clear description of the work
• Reference to the direction (email, site instruction, RFI)
• A detailed cost breakdown (labour, materials, plant, margin)
• Supporting documents (photos, timesheets, receipts)
• The date the direction was given

Step 5: Include Variations in Your Progress Claims

Even if a variation hasn't been formally approved yet, include it in your progress claim. List it in a separate "Variations" section with its status (submitted, under review, approved, disputed). Under SOPA, you're entitled to claim for variation work — the builder can dispute it, but if they don't provide a valid reason, it strengthens your case for adjudication.

How to Track Variations Across a Project

One variation is easy to manage. Twenty variations across a 12-month project? That's where things get messy. Here's a simple tracking system:

Variation Register

Keep a running list of every variation on the project:

Update this register every time a variation status changes. Review it before every progress claim to make sure all variations are included.

Common Variation Disputes and How to Handle Them

1. "That Was Always in Your Scope"

The builder claims the work you're calling a variation was actually included in your original contract scope. This is the most common dispute.

How to fight it: Go back to your contract documents — the scope of works, the drawings, the specification. If the work isn't specifically described in those documents, it's not in your scope. Present the evidence clearly and specifically. Don't argue about what was "intended" — argue about what was documented.

2. "You Didn't Follow the Variation Process"

The builder rejects your variation because you didn't submit it within the contractual timeframe, or you didn't use the right form, or you didn't get prior approval.

How to fight it: While contract procedures matter, they can't be used to avoid paying for work that was directed and completed. Under SOPA, the adjudicator looks at the substance — was extra work directed? Was it done? Then it should be paid for. Procedural non-compliance weakens your position but doesn't automatically kill your claim.

3. "Your Price is Too High"

The builder accepts the variation but disputes the amount. You claimed $8,000; they approve $4,500.

How to fight it: Provide a detailed breakdown. If your contract has schedule of rates, use those rates. If it's a new type of work, provide a cost-plus breakdown: labour hours × rate, materials at cost, plant, plus your margin. Substantiate every number. Adjudicators respond well to transparent, well-documented costings.

4. "We Never Directed That Work"

The builder denies ever asking you to do the work. This usually happens when the instruction was verbal — a foreman on site telling you to "just sort it out."

How to fight it: This is why written records are everything. If you emailed the builder confirming the verbal instruction and they didn't object, that's strong evidence. If there's a site diary entry, a text message, or a witness statement — use it. But if there's truly no written record, you're in a difficult position. The lesson: always confirm verbal instructions in writing immediately.

5. Omission Variations That Hurt You

The builder omits part of your scope as a "variation" and deducts the full contract value — but your fixed costs (mobilisation, crane hire, scaffolding) were based on the original scope. Removing work doesn't reduce your fixed costs proportionally.

How to fight it: Check your contract's omission clause. Many contracts allow you to claim for lost margin and unrecoverable fixed costs when scope is omitted. If the omission is significant, you may also argue that it's a fundamental change to the contract that entitles you to renegotiate.

Variations and Your Progress Claims

Variations should be a standard part of every progress claim. Here's how to include them properly:

1. List each variation separately — don't lump them into the main contract items
2. Show the status — approved, submitted, or disputed
3. Claim approved variations in full — if it's been approved, include the full approved amount
4. Claim submitted variations at your amount — the builder can dispute it in their payment schedule, but it's your right to claim it
5. Track the cumulative total — your total claim should clearly show: original contract + approved variations + claimed variations = total entitlement

When the builder's payment schedule comes back, check the variations section carefully. Are any variations missing? Has the builder reduced approved amounts? These are common areas where money gets lost.

The Real Cost of Poor Variation Management

We've seen it time and again: a subbie does $40,000 worth of variation work over a project, but only gets paid $22,000 because:

• $8,000 in variations were never submitted formally
• $5,000 was rejected because there was no written direction
• $5,000 was disputed and the subbie didn't push back

That's $18,000 left on the table — not because the work wasn't done, but because the paperwork wasn't right. On tight margins, that could be the difference between a profitable job and a loss.

Stay on Top of Every Variation

Managing variations properly requires discipline, documentation, and regular comparison of what you've claimed versus what the builder is paying. It's the boring part of running a trade business — but it's where the money lives.

SubbieClaim helps you track variations alongside your progress claims. When you upload the builder's payment schedule, our AI cross-references it against your claim — including every variation. It flags variations that have been omitted, reduced, or incorrectly assessed, so you know exactly where to push back.