How to Dispute a Variation Order in Construction

7 min read · Published by Lintel

A client disputes a variation order. They say the instruction was never given, or the price was never agreed, or the work wasn't needed. You know it was. They're saying it wasn't. What do you do?

The answer depends almost entirely on your documentation. If you have a timestamped record of the instruction, a signed approval, and a photo of the condition — you're in a strong position. If you have a verbal recollection and an email that says “sounds reasonable” — you're not.

This guide covers what to do when a variation is disputed, and — more importantly — how to document your variations so they rarely get disputed in the first place.

Why variation orders get disputed

Most variation disputes fall into one of four categories:

“We never instructed that.” The client denies the instruction was ever given. Common with verbal instructions on site, particularly when the person who gave the instruction is no longer involved in the project.

“We never agreed that price.” The client accepts the work was done but disputes the value. Common when VOs are raised after the fact rather than approved upfront.

“That was always in scope.” The client claims the variation was covered by the original contract. Common with vague contract specifications and missing drawing references.

“The work wasn't necessary.” The client disputes that the variation was required at all — particularly common with unforeseen conditions where no photographic evidence exists of the pre-existing state.

What to do when a VO is disputed

Step 1 — Don't argue verbally. Take the dispute out of conversation and into writing immediately. Respond in writing, set out your position clearly, and ask the client to do the same. Verbal disputes go nowhere. Written exchanges create a record.

Step 2 — Gather your evidence. Pull together everything you have on the variation:

The original VO document — description, date raised, cause of variation. Any emails, WhatsApp messages, or site instructions relating to the variation. Photos — of the condition before the work, during, and after. Your approval record — if the client approved it digitally, you should have a timestamped record of who approved it and when. Site diary entries for the relevant dates. Rate card evidence showing how you priced the variation.

Step 3 — Send a formal notice. Write to the client formally, setting out the variation, the instruction, the approval, and the value. Reference every piece of evidence. Give them a deadline to respond — 14 days is standard. Keep the tone professional and factual.

Step 4 — Escalate if necessary. If the client doesn't respond or rejects your position, you have three options: negotiate a settlement, refer to adjudication, or pursue through the courts. For most fit-out variation disputes, adjudication is the fastest and most cost-effective route.

Adjudication for variation order disputes

Construction adjudication is a statutory right under the Housing Grants, Construction and Regeneration Act 1996 (as amended). Any party to a construction contract can refer a dispute to adjudication at any time.

An adjudicator is appointed within 7 days, and a decision is reached within 28 days. The decision is temporarily binding — it must be complied with immediately, even if one party intends to challenge it in court later.

The key advantage of adjudication is speed. A variation dispute that would take 18 months in court can be resolved in 35 days. The key disadvantage is cost — adjudicators' fees typically run to £5,000–£15,000, and each party usually bears their own legal costs.

For a single disputed variation of £5,000, adjudication may not be cost-effective. For a final account dispute involving multiple variations totalling £50,000+, it almost always is.

The evidence that wins variation disputes

In adjudication, contemporaneous records carry far more weight than after-the-fact recollections. Evidence that was created at the time of the instruction is more credible than evidence created later.

The strongest evidence package for a disputed variation includes:

A timestamped variation order raised the day the instruction was given — not a week later, not at the end of the month. The timestamp proves you recorded it at the time.

A digital approval record showing the client approved the VO, with their name, email address, and the exact time they clicked approve. Not a verbal “yes”, not an email that says “looks fine” — a clear, attributable record of approval.

Photo evidence — particularly for unforeseen conditions. A photograph taken before the work started, showing the condition that made the variation necessary, is very difficult to dispute.

Chase records — if you chased the client for approval and they didn't respond, a timestamped log of your chase attempts demonstrates you gave them every opportunity to object before the work was done.

Drawing references — if the variation arose from a design change, logging which drawing revision was current at the time demonstrates the change was outside the original scope.

A site diary — contemporaneous notes of what happened on site each day, including any instructions received verbally.

How to avoid variation disputes

The best dispute is the one that never happens. Most variation disputes are preventable with better process:

Raise VOs immediately — the moment the instruction is given, not at the end of the week. Contemporaneous records are far harder to dispute than after-the-fact reconstructions.

Get written approval before starting — never rely on verbal approval. A digital approval with a timestamp and the client's name is as close to bulletproof as you can get.

Photograph unforeseen conditions — before, during, and after. Three photos are better than one.

Log verbal instructions immediately — if a client gives a verbal instruction on site, log it as a client instruction record the same day. Even if they later dispute the instruction, you have a contemporaneous record of it.

Reference the drawing revision — when raising a VO, log which drawing revision was current. If the client later claims the work was always in scope, you can point to the revision number.

Chase in writing — if a VO hasn't been approved, chase by email or through a formal system. Never just by phone. You need a record of every chase attempt.

How Lintel helps

Lintel creates the evidence trail that wins variation disputes — automatically, as part of the normal VO process.

Every VO is timestamped the moment it's raised. Every client approval is recorded with the approver's name, email, and the exact time they clicked approve. Every chase email is logged. Every photo is stored against the VO. If a variation ends up in dispute, the evidence package is already built.

Most Lintel customers find that disputed variations become rare once clients know that every instruction is being formally recorded and every approval is timestamped. The documentation doesn't just help you win disputes — it prevents them.

For a guide to raising variation orders correctly from the start, see how to manage variation orders on fit-out projects.

For a guide to pricing variation orders accurately, see how to price variation orders in construction.