Construction Change Orders: What They Are and How to Manage Them

Construction projects rarely go exactly as planned. Even with detailed drawings, accurate estimates, and a clearly defined scope of work, unexpected conditions and new requirements can arise after construction begins. A property owner might request different materials, an architect may revise a design, or a contractor might discover site conditions that were not visible during the initial inspection. Each situation can affect the project's cost, schedule, or scope.

This is where construction change orders become essential. A properly documented change order establishes what is changing, why the modification is necessary, how much it will cost, and whether it will affect the completion date. It also helps ensure that everyone involved understands and agrees to the revised contractual obligations.

This guide explains how construction change orders work, when they are needed, how to prepare them, and how to manage the approval process. It also includes a practical example and a checklist for documenting project changes.

What Is a Construction Change Order?

A construction change order is a formal document used to modify an existing construction contract after the original agreement has been executed. It records an agreed change to the project's scope of work, contract price, completion schedule, or a combination of these elements.

For example, imagine a contractor is renovating a commercial office. Halfway through the project, the owner requests additional electrical outlets and upgraded lighting fixtures that were not included in the original specifications. Rather than relying on a verbal agreement, the contractor prepares a change order describing the additional work, its estimated cost, and any necessary schedule adjustments. Once the required parties approve the document, the change becomes part of the contractual agreement.

A change order does not necessarily mean something went wrong. Modifications can result from legitimate design improvements, owner preferences, unexpected conditions, or regulatory requirements. The important distinction is that a change order formally documents an agreed modification instead of leaving the parties to rely on informal instructions.

The original construction contract establishes the initial scope, price, and terms, while an approved change order modifies specific portions of that agreement without replacing the entire contract.

When Is a Change Order Needed in Construction?

A change order may be appropriate whenever work differs from the original contractual requirements. However, not every project adjustment automatically qualifies for additional compensation or time. The contract determines how changes must be evaluated, documented, and approved.

Owner-Requested Changes

Property owners sometimes request modifications after construction has started. These requests may involve upgrading finishes, changing room layouts, adding equipment, or replacing originally specified materials.

For instance, a homeowner might decide to replace standard flooring with hardwood after the flooring subcontractor has already been scheduled. The contractor must determine the difference in material costs, labor requirements, procurement time, and potential impact on other activities before presenting the proposed change.

Unexpected Site Conditions

Some conditions cannot be fully identified before construction begins. Excavation may reveal unsuitable soil, renovation work may expose concealed structural damage, or underground utilities may differ from the available drawings. These discoveries can require additional work or alternative construction methods.

Whether the contractor is entitled to additional compensation or time depends on the contract's differing-site-conditions provisions, notice requirements, and allocation of risk.

Design Changes and Documentation Errors

Architectural or engineering drawings sometimes require revisions during construction. A design modification might involve relocating structural elements, changing mechanical systems, or correcting conflicting specifications.

When the revision changes the contractor's contractual obligations, the project team must evaluate its financial and scheduling consequences. Clear construction administration procedures help ensure that revised documentation reaches the appropriate people before the affected work proceeds.

Material Substitutions

Specified materials may become unavailable, experience delivery delays, or no longer meet the project's requirements. A contractor might propose an alternative product with comparable performance characteristics.

Even when the substitute costs the same amount, formal documentation may be necessary if the substitution changes the approved specifications or contractual scope.

Regulatory or Code-Related Changes

Building inspectors or permitting authorities may identify requirements that affect the planned work. Depending on the circumstances, additional safety features, accessibility modifications, or system upgrades may become necessary.

The project team should establish whether the work was already required under the original contract before treating it as a compensable change.

Types of Construction Change Orders

Construction change orders can be classified according to how they affect the contract price and scope. Three common categories are additive, deductive, and zero-cost changes.

Additive Change Orders

An additive change order increases the contract value because additional work, materials, equipment, or services are required. For example, adding a new conference room to a commercial renovation could require additional framing, electrical work, flooring, and finishes. The contractor calculates the additional costs and submits them for review under the contract's pricing provisions.

Deductive Change Orders

A deductive change order reduces the contract value when work is removed or replaced with a less expensive alternative. Suppose a project originally includes custom cabinetry, but the owner decides to eliminate that portion of the work. The change order should identify the deleted scope and determine the appropriate credit, accounting for applicable contract terms and any costs already incurred.

Zero-Cost Change Orders

A zero-cost change order documents a modification that does not change the contract price. For example, the owner and contractor might agree to substitute one approved finish for another of equal cost. However, a zero-cost change can still affect the schedule or other contractual obligations, so the absence of a price adjustment does not eliminate the need to document material changes to the agreement.

The Construction Change Order Process: Step by Step

The construction change order process should provide a consistent way to identify, evaluate, approve, and implement changes. Although specific procedures vary by contract and project, the following steps establish a practical framework.

Step 1: Identify and Document the Requested Change

The process begins when a potential modification is identified by the owner, contractor, architect, subcontractor, or another authorized project participant. The first step is to describe the issue clearly, explaining what differs from the original scope, why the change is being considered, and which drawings, specifications, or activities are affected.

Supporting materials may include photographs, revised drawings, inspection reports, meeting minutes, or written instructions. The project team should also review the contract's notice requirements immediately, since some agreements impose strict deadlines and procedures for reporting potential changes.

Step 2: Evaluate Costs and Schedule Impacts

Before submitting a proposed change, the contractor should assess its financial and scheduling consequences. Cost evaluation may include additional materials, labor, equipment, subcontractor expenses, applicable overhead, and permitted markup. For example, replacing specified fixtures with more expensive alternatives may require not only purchasing the new products but also modifying installation methods.

Schedule evaluation is equally important. The team should determine whether the change affects procurement, labor availability, task sequencing, or activities on the project's critical path. A change that requires three additional days of work does not necessarily justify a three-day extension to the contractual completion date. The actual schedule impact must be evaluated.

Step 3: Prepare the Construction Change Order

Once the implications are understood, the responsible party prepares the proposed change order using the documentation required by the contract. The document should identify the project, reference the original agreement, describe the modification, and specify the proposed adjustments to cost and time.

A clear description is essential. Instead of writing "additional electrical work," the document should explain which fixtures, circuits, locations, or specifications are changing. The goal is to make the proposed work understandable to someone who was not present during the original discussion.

Step 4: Submit the Change for Review and Approval

The proposed change order is submitted to the parties authorized to review it. Depending on the project, this may involve the owner, architect, construction manager, general contractor, or other designated representatives. Reviewers may request additional documentation, question pricing, or negotiate the proposed schedule adjustment.

Contractors should not assume that submitting a change order authorizes the work. In general, changed work should proceed only after the required approval or another valid contractual authorization has been issued. For example, under certain AIA contracts, a construction change directive may authorize work before the parties agree on the final cost or schedule adjustment.

Step 5: Update Project Records and Communicate the Change

After approval, the change order should be incorporated into the project's official documentation. Relevant updates may include the contract value, project budget, schedule, procurement records, subcontractor agreements, and construction drawings.

The approved change must also reach the people responsible for performing the work. If the office approves a revised material specification but the field team continues using the original drawings, the documentation process has failed to prevent confusion.

This is why consistent construction workflow management matters. Field supervisors, estimators, accounting personnel, and project managers need access to the same approved information to avoid discrepancies between contractual decisions and actual construction activities.

Construction Change Order Example

Consider a commercial renovation project with an original contract value of $150,000. During construction, the property owner requests upgraded lighting fixtures in several office areas. The original contract includes standard fixtures, but the revised specification requires higher-priced products and additional installation work.

After reviewing the request, the contractor estimates an additional $4,500 in materials, $2,000 in labor, and $500 in other applicable costs. The total proposed change order amounts to $7,000, increasing the contract value from $150,000 to $157,000. The contractor also requests a three-calendar-day extension because the upgraded fixtures require additional procurement time.

The proposed change order describes the work as follows: "Replace the originally specified standard lighting fixtures in conference rooms A and B with the owner-selected upgraded fixtures, including associated materials, installation labor, and required electrical adjustments, as detailed in revised drawing E-204."

To support the request, the contractor attaches the supplier quotation, labor estimate, and revised electrical drawing. The project team then evaluates whether the additional procurement time affects the contractual completion date or can be accommodated within the existing schedule.

Once the required parties approve the modification, the $7,000 adjustment, and the three-day extension, the change order becomes part of the contractual documentation. The revised contract value is $157,000, and the completion date is adjusted accordingly.

This example illustrates why construction change order documentation should address both financial and scheduling consequences. A price adjustment alone does not fully describe a modification if the work also affects project deadlines.

This is an illustrative example. Actual pricing and schedule adjustments depend on the project's contractual requirements.

What Should a Construction Change Order Form Include?

A well-prepared construction change order form provides enough information for reviewers to understand the proposed modification and its contractual consequences. The precise format depends on the contract. Some projects use standardized industry forms, while others rely on company-specific documents.

For example, the American Institute of Architects provides the G701 Change Order form for use with compatible AIA contractual arrangements. Regardless of the format, a practical construction change order template should clearly identify the project, the parties involved, and the modification being requested.

The document should begin with basic project information, including the project name, location, original contract reference, change order number, and preparation date. Assigning a unique number to each change makes it easier to track requests, approvals, and associated documentation throughout construction.

The next section should describe the proposed modification in sufficient detail. This includes identifying the work being added, removed, or revised, explaining why the change is necessary, and referencing any affected drawings or specifications. Supporting documents such as photographs, supplier quotations, subcontractor estimates, or inspection reports should be attached when relevant.

Financial information is another essential component. The form should indicate whether the modification increases, decreases, or leaves the contract price unchanged. It should also specify the amount of the adjustment and the revised contract value, accounting for previously approved changes.

For instance, if a $150,000 contract already includes $10,000 in approved modifications, an additional $7,000 change order brings the revised contract value to $167,000, not $157,000.

Finally, the document should address any adjustments to the construction schedule and include the approvals required by the contract. Clearly recording these details helps establish a shared understanding of the modification before the affected work proceeds.

Construction Change Order Checklist

Before submitting a proposed change order, confirm that the following information has been reviewed:

• The change is clearly described and tied to the original scope.
• The reason for the modification is documented.
• Relevant drawings and specifications are identified.
• Material, labor, and subcontractor costs are supported.
• Applicable markup and pricing rules have been checked.
• Potential schedule impacts have been evaluated.
• Contractual notice and submission requirements have been followed.
• The correct approval parties have been identified.
• The change order has a unique tracking number.
• The final approved document will be stored with the project records.

This checklist can be adapted to residential, commercial, and specialty construction projects.

Change Order vs. Change Order Request vs. Change Directive

Although these terms are closely related, they represent different stages or mechanisms within the construction change management process. Understanding their differences helps project teams distinguish between proposed modifications, approved contractual changes, and instructions that authorize work before all financial or scheduling terms have been agreed upon.

A change order request is generally a proposal submitted for evaluation. It may originate from a contractor, subcontractor, or another project participant and typically includes a description of the requested modification, supporting documentation, and estimated cost or schedule impacts. Submitting a request does not automatically mean the proposed work has been approved.

A change order, by contrast, formalizes an agreed modification to the original construction contract. Once properly executed by the required parties, it establishes the revised scope and any corresponding adjustments to the contract price or completion time.

A construction change directive serves a different purpose. Under certain contractual arrangements, it allows changed work to proceed before the parties reach a final agreement on cost or time adjustments. For example, under AIA A201-based procedures, the G714 Construction Change Directive may be used when a modification needs to move forward while its financial or scheduling consequences remain unresolved.

The distinction matters because these documents are not interchangeable. Their authority, approval requirements, and contractual effects depend on the governing agreement.

Common Construction Change Order Mistakes

Even relatively straightforward changes can create disputes when documentation or communication is incomplete. Several mistakes are particularly important to avoid.

Starting Additional Work Without Proper Authorization

A contractor receives a verbal request from the owner and immediately begins the additional work. Later, the owner disputes the cost or claims that the modification was never formally approved. The safer approach is to obtain the authorization required by the contract before proceeding, unless another contractual mechanism permits the work to begin.

Providing Vague Scope Descriptions

Descriptions such as "extra framing" or "additional site work" leave room for disagreement about what was included. A better description identifies the location, quantities, specifications, and affected activities. Specific documentation reduces the likelihood of disputes during billing or project closeout.

Ignoring Schedule Impacts

Some contractors focus on additional costs without evaluating the effect on completion dates. However, a material substitution or design modification may affect procurement, inspections, subcontractor sequencing, or critical-path activities. Schedule impacts should be analyzed and documented alongside pricing.

Failing to Update Budgets and Project Records

An approved change order has little operational value if it never reaches the accounting department or field team. Missing updates can produce inaccurate cost reports, outdated schedules, and inconsistencies between approved work and invoices.

Losing Track of Pending Requests

When several changes are being reviewed simultaneously, project teams can lose track of which requests are approved, rejected, revised, or awaiting additional information. Maintaining a change order log helps establish a reliable record of each request's status and responsible reviewer.

How to Manage Construction Change Orders Effectively

Effective construction change order management depends on more than preparing individual documents. It requires a repeatable process that connects field observations, cost estimates, contract administration, approvals, and project records.

Maintain a Centralized Change Order Log

A change order log provides an overview of all proposed and approved modifications. Useful tracking fields include the change order number, description, submission date, estimated value, approval status, responsible reviewer, and schedule impact.

The log should distinguish pending requests from approved contract adjustments so that proposed amounts are not mistakenly treated as committed revenue or authorized work.

Establish Clear Responsibilities

Every project should identify who can request changes, prepare estimates, submit documentation, approve modifications, and update project records. These responsibilities may differ between residential contractors, commercial general contractors, and subcontractors.

Project coordinators can help maintain change order logs, organize supporting documents, follow up on pending approvals, and ensure that the appropriate stakeholders receive updated information. However, contractual approval authority must remain with the individuals designated in the agreement.

Connect Field and Office Documentation

Construction changes often originate in the field, while estimates, approvals, and financial records are managed in the office. Both teams need access to accurate information.

For example, a superintendent may identify an unexpected site condition, but the project coordinator must ensure that photographs, daily reports, and relevant communications reach the estimator and project manager. The process works best when the documentation follows the issue from identification through final approval.

Use Consistent Templates and Tracking Tools

Standardized forms reduce the likelihood of missing important information. For smaller projects, a shared spreadsheet and organized document folders may be sufficient. Larger projects may benefit from construction change order management software that connects change events, budgets, approval workflows, and project documentation.

The right tool depends on project complexity, reporting requirements, and the team's ability to maintain accurate records. Software can support the process, but it cannot replace clear contractual procedures or responsible decision-making.

Final Thoughts

Construction change orders are a normal part of managing projects where requirements, conditions, and decisions can evolve after work begins. The objective is not to eliminate every change, but to ensure that modifications are properly evaluated, documented, authorized, and communicated.

A reliable process helps contractors maintain accurate budgets, protect contractual rights, coordinate field activities, and keep project participants informed. It also makes it easier to understand how individual decisions affect the broader project.

For construction companies, that process depends on consistent administrative coordination. OfficeTwo supports construction businesses with dedicated remote professionals who can assist with documentation, project coordination, and back-office responsibilities, helping internal teams maintain organized information while focusing on project execution.

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