change orders construction billing SOV + G702/G703

Types of Change Orders in Construction

Change orders can add work, remove work, extend the schedule, revise designs, address unforeseen conditions, or document work that changed in the field. Knowing the difference matters because each type affects the contract, Schedule of Values, and pay application differently.

Quick answer:

The most common types of construction change orders are additive, deductive, owner-requested, design-related, unforeseen condition, time extension, constructive, emergency, and allowance change orders. Approved cost changes should tie back to the contract value and the Schedule of Values before they are billed.

Educational content only, not legal advice. PayAppPro provides AIA-style outputs and is not affiliated with or endorsed by the AIA.
See Change Order Examples How to Bill Change Orders
Change order guides: Examples · Constructive change orders · Approved vs. pending · Add changes to G702/G703

What Is a Construction Change Order?

A construction change order is a formal modification to the original contract scope, price, schedule, or requirements. It may add work, remove work, change materials, revise quantities, address site conditions, or extend project duration.

For billing teams, the important question is not only what changed, but whether the change has been properly approved and how it should be reflected in the contract value, Schedule of Values, retainage, and current pay application.

Billing rule of thumb: A change order should not be treated as approved contract value until the required approval path is complete. If pending changes are mixed into the current pay app, the G702 contract sum, G703 line values, backup documents, and retainage math may not reconcile.

Common Types of Construction Change Orders

The table below summarizes the major change order types and how they usually affect billing.

Type What changes Contract impact Billing concern
Additive Additional scope, labor, materials, or equipment Usually increases contract value Add approved value to SOV before billing
Deductive Removed scope or reduced quantities Usually decreases contract value Reduce contract/SOV cleanly so totals reconcile
Owner-requested Owner changes scope, finishes, layout, or requirements Can increase, decrease, or change schedule Approval and backup are critical
Design change Plan/spec revision from architect or engineer Often affects cost and time Need documentation tying revision to cost
Unforeseen condition Unexpected field/site condition Often increases cost and/or time Photos, reports, and notice records matter
Time extension Contract duration or milestone dates May not change contract value Do not force a cost line where none exists
Constructive Field direction or changed work without formal CO Often disputed until resolved Can be risky to bill before approval
Allowance Allowance reconciled to actual selection/cost Can increase or decrease contract value Track original allowance vs. final cost

1. Additive Change Orders

An additive change order increases the contract value by adding scope that was not included in the original agreement. This is one of the most common types of change orders because project scope often expands after construction begins.

Examples

  • Owner adds upgraded lighting
  • Additional drywall or framing is requested
  • Parking lot paving scope is expanded
  • Extra electrical circuits are added

Billing impact

Once approved, the added value should increase the contract sum and be reflected in the Schedule of Values. The contractor can then bill progress against the approved change order line or related SOV line.

Simple example
Original contract$250,000
Approved additive change order+$15,000
Revised contract$265,000

2. Deductive Change Orders

A deductive change order reduces the contract value. This happens when the owner removes scope, changes to a lower-cost option, reduces quantities, or accepts a value-engineering adjustment.

Examples

  • Flooring area is removed from the project
  • A decorative feature is deleted
  • Owner selects a less expensive finish
  • Landscaping or site work is reduced

Billing impact

Deductive changes need careful handling because negative values can create confusion on the continuation sheet. The revised SOV and contract sum should match the approved deduction so the pay app does not overstate remaining contract value.

Simple example
Original contract$250,000
Approved deductive change order-$12,000
Revised contract$238,000

3. Owner-Requested Change Orders

Owner-requested change orders happen when the owner chooses to modify the project after the contract is signed. These may be upgrades, layout changes, added rooms, different materials, or revisions to the original scope.

Common issue: Owner requests may begin informally, but billing teams should confirm when the request becomes an approved change order. A conversation, email thread, or pricing request is not always the same as final approval.

4. Design Change Orders

Design change orders result from revised drawings, specifications, code requirements, or architect/engineer direction. These changes often affect multiple trades and may require both cost and schedule adjustments.

Examples

  • Structural detail is revised
  • Mechanical route changes after coordination
  • Electrical layout is updated
  • Fire-rated assembly changes affect materials

Billing impact

Keep the revised drawing, RFI, architect instruction, or field directive with the change order backup. Reviewers often want to see why the added cost belongs in the contract before approving it for billing.

5. Unforeseen Condition Change Orders

Unforeseen condition change orders arise when the contractor encounters hidden or unexpected conditions that were not reasonably anticipated from the plans, specifications, site information, or preconstruction review.

Examples

  • Hidden utilities are discovered
  • Unsuitable soil is encountered
  • Concealed structural damage is found
  • Existing conditions differ from drawings

Documentation to keep

  • Photos and field reports
  • Daily logs
  • RFI responses
  • Inspection notes
  • Cost backup and labor/material detail

6. Time Extension Change Orders

A time extension change order modifies the contract duration, milestone dates, or completion date. Some time extensions do not change the contract value, while others also include general conditions, acceleration, or delay costs.

Billing note: If the change only extends time and has no dollar value, it may not belong as a billable SOV line. If it includes approved cost, the cost component should be clearly separated from the schedule-only change.

7. Constructive Change Orders

A constructive change order occurs when the work changes without a fully executed written change order already in place. This can happen after verbal direction, field instructions, repeated owner requests, design clarifications, or requirements that effectively expand the original scope.

Constructive changes are risky because they are often disputed. Contractors may believe the work is outside the original contract, while the owner or GC may argue that the work was already included.

Important: Constructive changes require strong documentation. Before billing them on a pay application, confirm whether they have been formally approved or should remain separate from approved contract value.

For a deeper explanation, read What Is a Constructive Change Order?

8. Emergency Change Orders

Emergency change orders are used when immediate work is needed to protect safety, property, completed work, or project integrity. The work may begin before normal paperwork is finished, but documentation still needs to catch up quickly.

Examples

  • Water intrusion response
  • Temporary structural stabilization
  • Safety correction work
  • Emergency utility repair

Billing impact

Emergency work may be urgent, but approval, backup, photos, time records, material invoices, and scope descriptions still matter when the work is later submitted for payment.

9. Allowance Change Orders

Allowance change orders reconcile estimated allowance amounts to final selections, actual quantities, or approved costs. They can increase or decrease the contract value depending on whether the actual cost is higher or lower than the original allowance.

Example

A contract includes a $20,000 flooring allowance. The owner selects materials and installation that total $24,500. The approved allowance change order increases the contract by $4,500, and the SOV should be updated before that added value is billed.

How Change Order Types Affect AIA-Style G702/G703 Billing

Different change order types may start differently, but approved cost changes usually need to end up in the same place: the contract value, the Schedule of Values, and the current pay application totals.

1. Approval

Confirm the change is approved according to the contract requirements before treating it as billable contract value.

2. SOV update

Add or adjust the related Schedule of Values line so the G703 reflects the revised contract amount.

3. Pay app billing

Bill only the current approved progress, apply retainage consistently, and include backup when required.

Why pay applications get rejected

Change orders often cause rejections when the approved change order log, contract sum, SOV, G703 totals, retainage, and current payment due do not match.

  • Pending changes are billed as if approved
  • Approved change orders are missing from the SOV
  • Deductive changes are not reflected in the contract total
  • Retainage is calculated inconsistently on change order work
  • Backup documents do not support the amount being billed
How to Bill Change Orders Approved vs. Pending Change Orders Rejection Checklist

Change Order Documentation Checklist

Regardless of change order type, cleaner documentation makes billing easier and reduces the chance of a rejected pay application.

Before approval

  • Scope description
  • Change order number or reference
  • RFI, directive, drawing, or request source
  • Cost backup
  • Schedule impact, if any
  • Required notices

Before billing

  • Signed or otherwise approved change order
  • Updated contract sum
  • Updated SOV or G703 line item
  • Retainage treatment confirmed
  • Backup attached to pay app
  • Pending changes kept separate from approved changes

Keep Change Orders From Breaking Your Pay App

PayAppPro helps contractors create cleaner AIA-style pay applications with SOV rollups, approved change order tracking, retainage math, and rejection-prevention checks.

Start a Pay App See AIA Billing Software

PayAppPro creates AIA-style billing documents and is not affiliated with or endorsed by the AIA.

FAQ: Types of Change Orders in Construction

What are the main types of change orders in construction?

Common types of construction change orders include additive change orders, deductive change orders, owner-requested changes, design changes, unforeseen condition changes, time extension changes, constructive changes, emergency changes, and allowance adjustments.

What is an additive change order?

An additive change order increases the contract amount by adding work, materials, equipment, or scope that was not included in the original contract.

What is a deductive change order?

A deductive change order reduces the contract amount by removing work from the original scope, reducing quantities, or replacing a specified item with a lower-cost alternative.

What is a constructive change order?

A constructive change order occurs when the contractor performs work outside the original scope without a formal written change order already in place, often because of field direction, design clarification, or owner instruction.

Do all change orders affect the contract price?

No. Some change orders affect cost, some affect time, and some affect both. For example, a time extension change order may extend the project schedule without changing the contract value.

How do change orders affect AIA-style pay applications?

Approved change orders usually need to be reflected in the revised contract sum and Schedule of Values before they are billed on AIA-style G702 and G703 pay applications. Pending or disputed changes can cause rejections if they are billed before approval.

See Construction Change Order Examples

Types explain the change. Clean billing requires approval, SOV alignment, and consistent pay app math.

Related guides