2026 Guide to FIDIC Variation Orders in the GCC

• Verbal instructions are dangerous: Always get it in writing, or send a confirmatory letter the same day.
• Time is money: Separate time impact claims from cost claims to avoid leaving significant cash on the table.
• Records are your armor: Detailed, contemporaneous documentation is your best defense against disputed variations.

On a typical large FIDIC project in the GCC, variation orders represent 15–25% of the final contract value. On some projects – particularly those with incomplete design at tender or significant scope changes – that figure exceeds 40%.

That is a lot of work that was not in the original contract. It is also a lot of revenue that contractors fail to recover in full. The variation order process often breaks down somewhere between the instruction and the payment certificate.

Consider this real scenario. A contractor in Abu Dhabi is verbally instructed by the Resident Engineer to extend a pile cap beyond the original design dimensions. The RE says he will confirm it in writing. He does not. The contractor does the work: 14 additional piles, significant concrete and rebar overage.

Three months later, the contractor submits a Variation Order (VO) claim for $340,000. The Engineer's response? There was no formal instruction. The change was within the contractor’s means and methods discretion.

The contractor has photos, delivery tickets, and labor records. But they do not have the one thing FIDIC requires: a written instruction from the Engineer.

They recover $60,000. They should have recovered $340,000.

This article explains how that happens. More importantly, it shows you how to stop it.

How FIDIC Variation Orders Work Under Clause 13

Your rulebook for change on site.

Clause 13 of FIDIC contracts covers variations and adjustments. It details how changes to the original scope are managed. Understanding this clause is key to getting paid. Ignore it, and you risk doing work for free.

The Engineer's Power to Change the Job: Clause 13.1 Right to Vary

This clause gives the Engineer the power to instruct changes to the work. These changes can include additions, omissions, substitutions, or alterations in the sequence or timing of work. You, the contractor, must carry out these instructions.

For example, the Engineer might instruct changing the specified ceramic tiles in 10 bathrooms to marble flooring. This is a clear material change. You must execute this instruction. The instruction must be in writing. A verbal instruction is not enough. If the Engineer shouts an instruction across the site, your first question should always be: "Can I get that in writing?"

Your Ideas for Improvement: Clause 13.2 Value Engineering

You can also propose changes. If you find a way to build something cheaper, faster, or better, you can submit a Value Engineering proposal. This encourages innovation and efficiency.

If the client accepts your idea and it saves money, you often get a share of the savings. For instance, if you suggest using precast concrete panels instead of cast-in-situ, speeding up the build and cutting costs, you can share in those savings.

The Process: Clause 13.3 Variation Procedure

This clause sets out the procedure for managing variations. It begins with the Engineer issuing a written instruction or requesting a proposal. You, the contractor, then have a set time to respond. Your response must include a detailed description of the work and a proposed valuation.

The Engineer then evaluates your submission. They can agree to your price, or they can make their own determination. FIDIC sets timelines for this process. In the GCC, these timelines are often missed. A VO submitted in January might still be "under review" in September.

Getting Paid in the Right Money: Clause 13.4 Payment in Applicable Currencies

VOs are valued in specific currencies. This is important on projects with mixed currency cost structures. Contractors need to ensure they are paid in the right currency to avoid exchange rate losses.

If your contract uses both US Dollars and local currency, a VO for imported materials should be paid in USD. A VO for local labor might be in local currency. The contract defines these rules, and you must follow them.

When You Can't Agree: Clause 3.5 Agreement or Determination

What happens if you and the Engineer cannot agree on the price or value of a variation? The Engineer has the power to make a formal determination. This determination is binding until challenged through dispute resolution, such as a Dispute Adjudication Board (DAB) or arbitration.

You must keep working while this happens. It is frustrating, but it is the rule. An Engineer might value a concrete pour VO lower than your submission. You can accept the determination or refer it to a DAB for review.

Variation Order vs. Contractor's Claim: Know the Difference

This distinction is critical. Mixing them up is a common, expensive mistake.

• A Variation Order (VO): This is a formal instruction from the Engineer that changes the work. You do the work and get paid for it under Clause 13.
• A Contractor's Claim: This is your request for time or money for events not instructed as variations. Examples include delays, changes in law, or unforeseen conditions. You must notify the Engineer and claim for it under Clause 20.

A VO is an instruction. A claim is a request. Manage them separately.

Where the Variation Order Process Breaks Down on GCC Projects

Common pitfalls costing contractors millions.

The FIDIC manual is clear. Site reality in Dubai, Riyadh, or Doha is often not. Here is where the system fails, often at your expense.

Verbal Instructions That Never Get Formalised

This is the number one problem. The Resident Engineer needs a change made now. Stopping to write a formal instruction slows everything down. So, they give a verbal order. You comply to keep the job moving. You assume the paperwork will follow. It often does not.

Remember the Abu Dhabi pile cap example from the opening? The RE verbally instructed an extension. This led to 14 additional piles, significant concrete, and rebar overage. The contractor did the work. Without written confirmation, the Engineer later denied the instruction. The contractor lost $280,000. This happens due to programme pressure, existing relationships, or REs avoiding formal channels. The result: you have no proof of instruction. Your claim becomes an argument, not a fact.

The Engineer's Refusal to Issue a Formal Instruction

Sometimes, the Engineer believes the work is within scope. They see your request for a VO as you trying to make extra money. They will stonewall you. Or they might be managing the client's budget.

A groundworks subcontractor was told to excavate deeper for a foundation. The Engineer insisted it was "site condition" work. The subcontractor knew it was a change from the design. The Engineer refused a VO. Your only leverage is a formal notice under Clause 20.1. This preserves your right to claim later. Do the work under protest. Document everything.

VOs Submitted But Not Valued on Time

FIDIC sets a 42-day timeline for the Engineer to respond to your pricing. On GCC projects, it is normal for VOs to sit for six months without a response. This ties up your cash and affects profitability.

A $180,000 VO for extra mechanical works is submitted in January. You bought the materials and paid the labor in February. By September, you still have not been certified. You are financing the client’s change. This kills profitability.

VOs Valued at Contract Rates When They Should Not Be

This is a classic Quantity Surveyor battle. Clause 12 says to use BOQ rates for similar work. Engineers love this. They try to apply a standard concreting rate to everything. But what if the work is different?

Installing pipework in a confined, operational plant is not the same as doing it in an open greenfield site. The risk, labor, and time are completely different. You must justify a new rate. This requires clear records showing the different conditions.

VOs That Drag Multiple Packages

A client-instructed design change can affect many parts of a project. Civil, structural, MEP, and fit-out packages might all be impacted. You submit separate VOs for each. The Engineer processes them individually. They miss the combined program impact.

The client changed the HVAC system design. This meant re-routing ducts, changing slab openings, and new ceiling layouts. You submitted separate VOs for concrete, steel, and MEP. The Engineer only looked at each VO individually. They did not see the cumulative delay this caused to the overall project.

Time Impact Not Claimed Separately From Cost

This is the most expensive mistake. You price the direct cost of the extra rebar and concrete. You forget the indirect costs. The VO delayed your critical path by three weeks. Your site supervision, cranes, and accommodation were all there for an extra three weeks. That costs real money.

This is a separate claim under Clause 20. You must submit it separately from your Clause 13 cost claim. If you bundle them, the Engineer will often only address the direct costs.

Building a Variation Order Management System That Works on a GCC Project

A practical framework for protecting your commercial position.

You need a system. Not a fancy one. A simple, ruthless process that everyone on your team follows. This protects your commercial position and ensures you get paid.

Step 1: Capture the Instruction Immediately

The moment an instruction is given, capture it. If it is verbal, your project engineer's first job is to write a confirmatory letter. Send it the same day. Not tomorrow. Today.

Here is the format:

"Further to our conversation with [RE Name] on [Date] at [Time], we confirm your instruction to [describe work]. We will proceed and submit our formal cost estimate under Clause 13.3 within 14 days. If this instruction is not correct, please advise us immediately."

This shifts the burden to them. Silence is acceptance. Attach a marked-up drawing if possible.

Step 2: Price the VO Completely Before Starting the Work (Where Possible)

Ideally, agree the price before the work starts. This is not always possible for urgent changes. But even then, submit a preliminary estimate within 24 hours. This establishes a commercial baseline. It stops the client from being shocked by a large number months later.

For an urgent concrete pour change, submit an estimate for the extra volume. State it is based on current unit rates. Note that a detailed rate analysis will follow.

Step 3: Maintain a VO Register That Both Parties Acknowledge

Use a simple spreadsheet. List every VO: number, description, date instructed, date submitted, value claimed, value agreed, status, and payment certificate reference. Share this register with the Project Management Consultant (PMC) every week in your commercial meeting. Make them acknowledge it.

A shared register finds disputes early. A private register finds them at final account, when it is too late to fix.

Step 4: Separate Time Impact Claims From Cost Claims

Keep your time impact claim physically separate. Different document, different clause (Clause 20), different submission. Calculate your prolongation costs properly: additional site staff, plant hire, utilities, and prelims. Do not just add a random percentage.

For example, submit a Clause 13.3 cost estimate for the extra work. Separately, submit a Clause 20.1 claim for delay and disruption. Detail the impact on your program. This stops "we will discuss EOT later" situations.

Step 5: Escalate Slow Valuations Formally

If your VO submission has been with the Engineer for over 28 days, write a formal letter. This is not aggressive. It is professional. It creates a paper trail for a future dispute.

"We submitted VO #045 for valuation on 1st May. As of today, 29th May, we have not received a determination. We record this delay and reserve our rights for any resulting financing charges."

Pricing Variations Correctly Under FIDIC: What Most Quantity Surveyors Get Wrong

Understand the hierarchy, protect your profits.

Proper valuation is critical. FIDIC Clause 12 outlines a clear pricing hierarchy. Many Quantity Surveyors (QSs) make mistakes here, leaving money on the table.

Contract Rates First

Use Bill of Quantity (BOQ) rates only if the work is truly similar in character and executed under similar conditions. "Similar conditions" means the same location, same time of year, and same access. Night work is not similar to day work.

Example: If the BOQ has a rate for concrete pouring at ground level, use that for additional concrete at ground level. If the same concrete work is now at height, or in a tight space, conditions are not similar. This justifies new rates.

New Rates Derived from Contract Rates

If work is similar in character but conditions are different, adjust the contract rate. The original rate is a starting point. Add costs for the changed conditions. For example, a concreting rate might be increased by 30% for working in a tight, confined space with limited access. This accounts for extra formwork, ventilation, access hours, and permit delays.

Star Rates for Genuinely Different Work

When the work is materially different, use Star Rates. This means pricing it based on actual cost plus agreed margin. This applies to new types of work not covered by existing rates. For example, a contractor is asked to install a special drainage system. It uses unique pipes and installation methods, not in the BOQ. The QS should calculate the actual cost of materials, labor, plant, and add profit. This becomes a Star Rate.

What You Always Undervalue

Most QSs underprice variations. They focus on materials and labor and forget the rest. This leaves significant money on the table:

• Supervision: The extra work needs extra foremen and engineers. Their time costs money, especially for night shifts or extra permits.
• Programme disruption: The variation disrupts other work. Labor moves off efficient tasks to handle the change. This loss of productivity is a real cost. Explain this with a simple measured mile analysis if possible.
• Preliminaries: Your site accommodation, utilities, and security costs continue for longer. This includes extended site management, temporary power, and tower crane time.
• Equipment mobilization: Special equipment call-out and minimum hire periods.
• Design input: If the variation needs design work, charge for your design team’s time, shop re-design, third-party approvals, and BIM re-coordination.

The Daywork Option

For small, unpredictable work, use daywork. The key is getting the Resident Engineer (RE) to sign the daywork sheet at the end of each day. No signature, no payment. It is that simple.

Daywork is used when work cannot be measured easily or its value is hard to assess beforehand. It is based on time spent, materials used, and plant deployed. When to use it: for minor, unforeseen tasks or small scope changes that are hard to price with unit rates.

What to include on a daywork sheet:

• Date, location, and description of work.
• Names and hours of workers by grade.
• Type and hours of plant.
• Materials used with delivery notes.
• Engineer's signature.

Always get the RE's signature on the daywork sheet before the workday ends. This prevents disputes later.

Protecting Your Position When the Engineer Won't Issue a VO

How to proceed when instructed work is disputed.

What do you do when instructed to do work the Engineer refuses to call a variation? You must protect your right to claim payment.

Proceed With the Work Under Clause 13.1

You are obliged to comply with instructions. Even if you dispute it is a variation, you must do the work. Refusing can lead to breach of contract. For example, the Engineer insists a deeper excavation is part of the original scope. You disagree. But you still excavate. State that you are proceeding "without prejudice to entitlement." This means executing the work does not mean you accept it is within the original scope.

Issue a Notice Under Clause 20.1 Simultaneously

This is your formal notification. It preserves your right to claim. It tells the Engineer you view the work as a claim event. For example, while excavating, send a Clause 20.1 notice. State that you are incurring additional costs and time. Explain why the work is outside the original scope. This notice must be sent within the specified period, often 28 days.

Keep Full Contemporaneous Records

Detailed records are your best defense. These records prove what happened on site and justify your claims. File them by VO number.

• Daily diaries: Note all instructions, discussions, and site conditions.
• Photographs: Document the work, site conditions, and progress.
• Labor allocation records: Show who worked on what, and for how long.
• Plant utilization logs: Track equipment used for the disputed work.
• Delivery notes: Proof of materials used.

For instance, take photos of the deeper excavation. Log the extra hours for your excavation team. Note the additional fuel used by the plant. Your evidence must be overwhelming.

Do Not Accept the Engineer's Position Without a Written Response

If the Engineer says it is not a variation, do not just agree verbally. Send a written response. Clearly state your position. Explain why you believe it is a variation. Refer to contract clauses and facts.

If the Engineer writes that the deeper excavation is within your responsibility, reply in writing. Cite the BOQ and drawings. Explain how the work exceeds those documents. Always state you are working under protest and pursuant to your Clause 20.1 notice.

This radar chart illustrates the typical performance of FIDIC variation order management on GCC projects compared to the ideal best practice. A score of 1 indicates poor performance, while 5 represents excellent adherence to best practices. As shown, common issues include a lack of formal instruction adherence and insufficient integration of time impact into claims. Implementing robust management systems can significantly improve these areas.

This mindmap provides a visual overview of FIDIC variation orders, highlighting how they are supposed to work under Clause 13, common breakdown points in GCC projects, essential steps for effective management, correct pricing strategies, and how to protect your position when disagreements arise. It serves as a quick reference for navigating the complexities of variations on construction projects.

This bar chart illustrates the typical financial exposure for contractors on GCC projects across various common variation management issues. The scale of 0 to 10 indicates the severity of potential financial loss. Notably, neglecting time impact claims and issues with verbal instructions present the highest risks. This highlights where contractors need to focus their efforts to mitigate losses and protect their profits.

Frequently Asked Questions

Conclusion

Variation orders are a major source of commercial disputes on GCC projects. Many contractors do work they do not get paid for. The key is to manage them proactively. By understanding Clause 13, recognizing common pitfalls, and implementing a robust management system, you can significantly reduce your financial exposure and ensure fair compensation.

Take one action this week. Go to your current GCC project. Count how many verbal instructions have been given in the last 30 days that do not have a corresponding confirmatory letter or formal VO. Every one of those is a potential unpaid claim. Find out this week. Close that gap. Start today.