Contractors

Construction Change Order Drafter

Draft a professional, well-documented change order request for additional work or cost due to a contract change. This prompt helps contractors write change orders that clearly identify the change basis, quantify the cost impact, document the schedule impact, and present the information in a format that supports owner review and approval.

This prompt drafts a formal change order request document covering a change narrative distinguishing the original contract scope from the additional work, the contractual basis (owner direction, unforeseen condition, design error, or RFI clarification that expanded scope), an itemized cost breakdown (labor hours at rate, materials, equipment, subcontractor cost, and markup percentage per the contract), a schedule impact statement in calendar days for the affected critical path activities, and a reservations clause for related impacts not yet fully evaluated. Change orders must be submitted within the contractual notice period — most contracts allow only 7–14 days after identifying a changed condition, and late notice can forfeit the right to additional compensation. It is for general contractors and project managers managing contract changes on commercial construction projects under AIA, GMP, or design-build contract structures.

Testedclaude-sonnet-4-6ValidatedMar 2026ScopeVerify against current contract documents and local regulati…TierProfessional
AI Role
You are a senior construction project manager with expertise in change order man…
Models
Claude
Confidence
Professional
Constraints
Verify against current contract documents and local regulations. This does not replace professional engineering judgment.
Change orders must be submitted within the contractual notice period — late change order notices can forfeit the right to additional compensation.
Do not perform work based on an oral change order in a contract that requires written authorization — document and seek written approval.
All cost items must be supportable with backup documentation — markup percentages and unit rates should match the contract terms.
Tested Models
claude-sonnet-4-6
Uncertainty
If the cost details or schedule impact are not yet fully known, draft a change order with preliminary estimates and note that a final change order with supporting documentation will follow. Include a reservation statement for unresolved impacts.
Last updated
2026-05-28Published

The prompt

1,888 characters
change-order-drafter.prompt
You are a senior construction project manager with expertise in change order management, contract administration, and construction cost documentation.

Draft a change order request for the following:

Project information:
- Project name: [PROJECT_NAME]
- Contract type: [CONTRACT_TYPE — e.g., AIA A101, GMP, Design-Build]
- Change order number: [CO_NUMBER]

Change information:
- Change description: [CHANGE_DESCRIPTION]
- Change driver: [CHANGE_DRIVER — e.g., owner-directed change, unforeseen condition, design error, RFI clarification that expanded scope]
- Contract document reference: [DOCUMENT_REF — section or drawing that establishes the baseline]

Cost information:
- Labor cost: [LABOR_COST]
- Material cost: [MATERIAL_COST]
- Equipment cost: [EQUIPMENT_COST]
- Subcontractor cost: [SUBCONTRACTOR_COST]
- Contractor markup (overhead and profit %): [MARKUP]
- Total: [TOTAL]

Schedule information:
- Schedule impact: [SCHEDULE_IMPACT — days]
- Activities affected: [AFFECTED_ACTIVITIES]

Draft a change order with:

## Change Order Header
Project name, contract reference, CO number, date, from/to.

## Change Description
Clear narrative of what changed, what the original contract required, and what additional work is included in this change order.

## Contract Basis
The contract section, drawing reference, or direction that authorizes or requires this change.

## Cost Breakdown
Itemized breakdown: labor (hours × rate), material (quantity × unit cost), equipment, subcontractor, and markup — with the basis for each cost.

## Schedule Impact
If the change extends the contract duration, a specific statement of the number of calendar or working days and the affected activities.

## Reservations
If there are related cost or schedule impacts still being evaluated, note that additional change orders may follow.

## Approval Block
Signature blocks for contractor and owner.
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How to use this prompt

1

1. Submit change orders promptly — most contracts have strict notice periods (often 7-14 days after identifying a changed condition). Missing the notice period can forfeit your right to compensation.

2

2. Provide complete backup documentation with every CO — labor tickets, material invoices, subcontractor quotes, and equipment logs. Lump-sum change orders without backup are regularly rejected or negotiated down.

3

3. Separate the change order description from the cost justification — the description should explain what happened; the cost breakdown should explain how much it costs.

Customization tips

Add 'This change involves a directed acceleration to recover lost schedule time — document separately as a time impact analysis showing impact to the critical path.'
For GMP contracts, add 'Confirm whether this change affects the GMP amount, the owner's allowances, or the contractor's contingency before presenting to the owner.'
Append 'Include a reservation for extended general conditions if the schedule impact has not yet been fully evaluated — general conditions accumulation is a commonly missed cost in early change orders.'

Sample output

Mar 2026Professional
Change Order — Mechanical System Modification Change Order Number: CO-017 Project: [Project Name] Date: [Date] From: [General Contractor Name] To: [Owner / Owner's Representative] Subject: Additional HVAC Ductwork — Commercial Office Renovation, Zone C CHANGE ORDER DESCRIPTION: This change order captures the cost of additional HVAC ductwork required in Zone C of the second floor due to a field condition discovered during demolition. The existing ceiling cavity height in Zone C (offices 201-214) is 4 inches less than indicated on the as-built drawings provided during bidding, which prevents the installation of the ductwork sizes specified on Mechanical Drawing M-2.3 as originally designed. The mechanical engineer of record reviewed the field condition and issued Architectural Supplemental Instruction ASI-009 dated [Date] directing the contractor to re-route the Zone C supply and return ductwork through the corridor plenum and add a secondary distribution branch within each office space. SCOPE OF ADDITIONAL WORK: • Add 180 linear feet of 18-inch supply duct routing through corridor plenum (not in original scope) • Add 14 flex duct branches from plenum supply to individual office diffusers (8-foot lengths each) • Install 14 additional ceiling diffusers in offices 201-214 (original diffuser locations could not be used due to re-routing) • Remove 90 linear feet of originally specified ductwork that cannot be installed due to ceiling height constraint (credit) COST BREAKDOWN: Additional ductwork materials (18-inch supply, flex branches, diffusers): $18,400 Additional labor for re-routing and installation: $22,100 Removal and disposal of originally specified ductwork (credit): ($4,200) General contractor supervision and overhead (8%): $2,904 General contractor fee (4%): $1,552 Subtotal Change Order Cost: $40,756 Owner approval required for amount: YES (over $25,000 threshold per contract) SCHEDULE IMPACT: 4 calendar days added to Zone C mechanical completion. Float is available in the Zone C sequence; no impact to substantial completion date is anticipated. REFERENCES: ASI-009, Field Report FR-041, Mechanical contractor quotation [Date] Owner signature: _____________ Date: _____________

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Professional Disclaimer

This AI-generated content is for informational and educational purposes only. It does not replace the professional judgment of licensed engineers or construction professionals. Always verify against current contract documents, local building codes, and safety regulations.