Have you ever started a construction project with an agreed budget, only to discover that a few changes could increase the cost or push back the completion date?
Perhaps you decide to use a different finishing material, adjust the building layout or add a feature that was not included in the original plan. Even a seemingly small change can affect other parts of the work.
In construction, these changes need to be managed carefully. This is where a variation order becomes important.
A variation order helps document an agreed change to the original scope of work, such as an adjustment to the design, materials, quantities or construction requirements. Depending on the contract and the nature of the change, it may also affect the project cost and completion timeline.
Understanding variation orders can help property owners, developers and contractors make better decisions, avoid misunderstandings and manage construction projects more effectively.
What Is a Variation Order in Construction?
A variation order in construction is a formal record of an approved change to the original scope of work under a construction contract.
The change may involve adding work, removing work, modifying an existing requirement or substituting one material or specification for another.
For example, imagine a client agrees to build a residential property with a particular floor finish. During construction, the client decides to use a different material. If that change affects the agreed work, specifications, quantities or costs, it may need to be assessed and documented as a variation under the contract.
A variation order helps the relevant parties establish what is changing and how the change will be handled.
Depending on the contract, the document may include:
- A description of the proposed change.
- The reason for the change.
- The work or materials affected.
- The additional or reduced cost, where applicable.
- Any expected impact on the project schedule.
- The relevant approvals and supporting documents.
The exact process and terminology vary by contract. A variation should therefore be managed in line with the project’s contractual requirements rather than treated as an informal instruction.
Why Do Variation Orders Happen?
Construction projects involve multiple decisions, materials, people and activities. Although careful planning can reduce unnecessary changes, variations may still arise for several reasons.
1. Changes to the Design
A client may decide to modify a layout, increase the size of a room, add a feature or change a finishing detail after the original design has been agreed.
Depending on the change, this may affect quantities, labour, materials and other parts of the project.
2. Changes Requested by the Client
A property owner may want to upgrade a material, introduce an additional feature or remove an item from the original scope.
These requests can be reasonable, but their cost and schedule implications should be understood before the work is changed.
3. Unexpected Site Conditions
During construction, the team may encounter conditions that were not fully apparent during the initial planning or investigation.
Such discoveries may require the design or method of construction to be reviewed. The appropriate response will depend on the circumstances, technical advice and the terms of the contract.
4. Material or Specification Changes
A specified material may become unavailable, or the client or design team may propose an alternative.
Before making a substitution, the relevant professionals should assess whether the alternative meets the project’s requirements. Any resulting cost or schedule implications should also be considered.
5. Regulatory or Technical Requirements
A project may require changes following a necessary technical review, an approval process or a change in applicable requirements.
These changes should be assessed by the appropriate professionals and managed in accordance with the contract and relevant obligations.
Not every site instruction or minor adjustment automatically constitutes a formal variation. The contract and the nature of the change determine the appropriate process.
How Can a Variation Order Affect Construction Costs?
One of the most immediate concerns when a construction change is proposed is its effect on the budget.
A variation may increase or decrease the total contract price, depending on the work being added, removed or modified.
For example, adding a room feature may require additional materials, labour and installation time. Changing a finish could affect the cost of the product itself, the preparation required and the work already completed.
The financial impact may include:
- Additional or reduced material quantities.
- Changes to labour requirements.
- Additional equipment or specialist services.
- Removal or reworking of completed work.
- Transportation, procurement or handling costs.
- Other cost implications permitted under the contract.
It is important to assess the full impact rather than considering only the price difference between two materials.
A change that appears inexpensive on its own may affect other work or require activities to be repeated.
Before approving a variation, the client and relevant project team should review the proposed cost and understand how it affects the overall budget.
How Can Variation Orders Affect Project Timelines?
Changes can also affect the construction schedule.
Some variations can be completed within the existing programme. Others may require additional time, especially if they involve new materials, revised drawings, specialist work or changes to activities that are already underway.
For example, changing a material after it has been ordered may require a new procurement process. Modifying a completed section of work may also require removal, reinstallation and additional inspection.
Potential schedule impacts include:
- Time needed to review and approve the proposed change.
- Additional time to procure materials.
- Changes to the sequence of construction activities.
- Extra labour or specialist work.
- Rework or delays to dependent activities.
However, a variation does not automatically mean that a project will be delayed. The impact depends on the type of change, when it is introduced, available resources and the existing construction programme.
This is why the time implications should be assessed alongside the cost before the change is implemented, wherever practicable.
What Should Be Reviewed Before Approving a Variation Order?
A variation should not be treated as a simple request to change something on site. It should be reviewed so the relevant parties understand what the change involves.
Before approval, consider the following steps.
1. Clearly Describe the Change
Identify exactly what is being added, removed, substituted or modified.
Where applicable, refer to revised drawings, specifications, schedules or other supporting documents. Clear descriptions help reduce confusion about what has been agreed.
2. Assess the Technical Implications
The proposed change should be reviewed by the relevant construction professionals to establish whether it is suitable for the design and project requirements.
Changes affecting structural elements, building systems or safety-critical work may require specific technical review and approval.
3. Calculate the Cost Implications
Review the additional or reduced costs associated with the change. This should consider the work affected, relevant quantities, materials, labour and other applicable costs under the contract.
The assessment should also identify whether the variation changes the agreed contract price and how the revised amount will be handled.
4. Review the Schedule
Determine whether the change affects procurement, labour, work sequencing or the expected completion date.
If additional time is required, the proposed impact should be assessed and recorded in line with the contract.
5. Obtain the Required Approval
The people authorised to approve variations should be identified in the construction contract.
A client request, informal conversation or site discussion should not automatically be assumed to constitute contractual approval.
Where practicable, obtain the necessary approval before the changed work begins. If urgent circumstances require immediate action, follow the contract’s procedures for instructions, authorisation and subsequent documentation.
6. Keep a Clear Record
Document the agreed change and retain relevant supporting information, including cost assessments, revised drawings, instructions and approvals.
A clear record helps the parties understand what was agreed and provides a reference if questions arise later.
What Happens If Construction Changes Are Not Properly Documented?
When changes are implemented without clear records, disagreements can arise over what was requested, what was approved and who is responsible for the resulting costs.
For example, a client may believe a requested upgrade was included in the original price, while the contractor may consider it additional work. If the agreement is unclear, resolving the difference can become more difficult.
Poorly managed changes can also make it harder to track the remaining budget, coordinate site activities and monitor progress against the construction programme.
Proper documentation supports:
- Better communication between clients and contractors.
- Clearer cost tracking.
- More informed schedule management.
- Accountability for decisions and approvals.
- A reliable record of changes to the original scope.
The purpose is not to make construction unnecessarily complicated. It is to ensure that important decisions are understood and recorded by the people responsible for the project.
How Can You Reduce Unnecessary Variations in Construction?
Not every variation can be avoided. However, proper preparation and communication can help reduce changes that arise from preventable misunderstandings or incomplete planning.
Here are some practical steps:
Finalise key decisions early. Confirm important layout, material and finishing choices before the affected work begins wherever possible.
Review drawings and specifications carefully. Make sure the relevant parties understand the agreed requirements.
Establish a realistic budget. Allow for properly assessed project costs and clarify how changes will be priced and approved.
Communicate through the agreed process. Ensure that requests and instructions reach the appropriate people and are recorded as required by the contract.
Review proposed changes before implementation. Consider technical suitability, cost and schedule implications together.
Maintain accurate project records. Keep approved drawings, instructions, variation records and cost updates organised.
These practices support better project coordination and help clients understand the consequences of decisions made during construction.
The Role of Construction Management in Handling Variations
Effective construction management involves coordinating the scope of work, resources, costs, schedules and communication throughout a project.
When a variation is proposed, the project team needs to understand how it relates to the original agreement and what effect it may have on other activities.
This requires more than simply agreeing to a change. It involves reviewing the relevant information, consulting the appropriate professionals, assessing cost and time implications, securing the required approvals and updating project records.
For property owners and developers, understanding this process makes it easier to ask the right questions before authorising additional work.
At Legendary Foreshore, construction planning and project coordination are important considerations in delivering projects. Clear communication and informed decision-making help clients and project teams understand the work involved and manage changes more effectively.
Final Thoughts
Variation orders are a normal part of many construction projects, but they should not be handled casually.
A change to the design, materials, quantities or scope of work may affect the contract price, completion schedule or other project requirements. The actual impact depends on the nature of the change and the terms of the agreement.
Before implementing a variation, the relevant parties should review what is changing, assess the technical requirements, understand the cost and time implications, obtain the necessary approvals and document the decision wherever practicable.
Good construction management is not just about delivering the original plan. It is also about managing necessary changes with clarity, proper review and accountability.
Planning a Construction Project?
Whether you are planning a residential development, a commercial building or another construction project, early planning and clear communication can help you manage decisions throughout the process.
Talk to the Legendary Foreshore team about your construction project and how proper planning can support its delivery.
A variation order is a formal record of an approved change to the original scope of work under a construction contract. It may involve changes to design, materials, quantities or other requirements and may affect cost or time.
No. A variation may increase or decrease costs depending on the work added, removed or changed. The financial impact should be assessed before approval.
It can, but not every variation causes a delay. The impact depends on the nature of the change, procurement requirements, work sequencing and the project schedule.
Approval depends on the construction contract and the authority assigned to the relevant parties. Clients and contractors should follow the agreed procedure rather than assume that every verbal request constitutes approval.
Where practicable, the proposed change should be reviewed, priced, assessed for schedule impact, approved by the authorised parties and documented before implementation. Urgent situations should be handled under the contract’s applicable procedures.
Use clear project specifications, establish an agreed approval process, assess cost and time implications before changes are implemented where practicable, and maintain accurate records of instructions and approvals.