Scope
Define included work and excluded items precisely. Attach drawings, specs, and allowances to limit interpretation disputes and clarify change order triggers.
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Cost Plus Contract
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What a Cost Plus Contract Is and when it applies
Why organizations choose a Cost Plus Contract
Cost Plus Contracts provide transparency of actual costs, allow faster project starts when scope is uncertain, and accommodate change orders and variable site conditions without frequent renegotiation.
Typical users and roles for a Cost Plus Contract
Owners, general contractors, specialty subcontractors, and project managers commonly use Cost Plus Contracts when flexibility or detailed cost tracking is required.
- Owners and developers who need flexibility to adjust scope during construction and accept cost risk for greater transparency.
- General contractors who require reimbursement for actual expenditures plus a negotiated fee or percentage for overhead and profit.
- Project managers and owners' reps who need itemized cost visibility for auditing and progress payments.
These contracts suit projects with unknowns (renovations, phased builds, technical installations) and where owner oversight of costs and documentation is anticipated.
Core elements to include in a professional Cost Plus Contract
Cost Categories
List reimbursable direct costs, indirect costs, subcontractor costs, and excluded items. Specify receipt requirements and accounting methods for cost validation.
Fee or Markup
State the contractor fee model: fixed fee, percentage of costs, or cost-plus-fixed-fee. Define whether markups apply to subcontractors, materials, or both.
Billing
Set invoicing intervals, required backup (timesheets, receipts), retainage percentage, and payment due dates to manage cash flow and disputes.
Change Orders
Describe change order approval procedures, authorization thresholds, and timeframes for pricing and implementation to avoid unauthorized work.
Audit Rights
Grant owner rights to inspect books, request copies of receipts, and conduct third-party audits within defined windows after final payment.
Step-by-step: completing a Cost Plus Contract
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01Prepare draft: Assemble scope, estimates, and reimbursements.
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02Agree fees: Negotiate contractor fee or percentage.
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03Specify controls: Add invoicing, audit, and change order rules.
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04Sign and retain: Obtain signatures and save executed copies.
Configuring an online Cost Plus workflow
| Field | Configuration |
|---|---|
| Signer order | Owner signs after contractor; sequence enforces approvals |
| Required fields | Set parties, effective date, fee, and billing terms as mandatory |
| Attachments | Include exhibits: scope, schedule, and pricing backup |
| Notifications | Enable reminders at 3 and 7 days past due |
Where to send and how routing typically works
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Upload: Sender uploads contract and attachments to the eSignature platform.
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Assign: Add signers, set order, and configure required fields.
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Authenticate: Choose signer authentication method (email, SMS code, KBA).
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Deliver: Final signed copies distributed to all parties and retained for audit.
Digital signing and distribution considerations
Confirm platform features and integrations before e-signing a Cost Plus Contract to support compliance and recordkeeping.
- File formats: PDF and DOCX supported
- Integrations: Connects with CRM, ERP, and cloud drives
- Authentication: Support for SMS, email, and advanced methods
Ensure the chosen platform preserves audit trails, stores executed documents securely, and supports the retention policy required for financial and construction records.
Key timing and deadline items to track
Effective Date:
Triggers warranties, payment terms, and insurance coverage
Progress Billing Dates:
Monthly or milestone invoicing schedule for reimbursement
Payment Due Date:
Net terms (e.g., Net 30) from invoice receipt
Change Order Response Time:
Contract should specify response window (e.g., 14 days)
Lien Notice Deadlines:
State deadlines for preliminary notices and lien filings
Typical milestones from mobilization to final accounting
01
Mobilization
Site setup, initial procurement, and first invoice submission
02
Progress Reviews
Periodic inspections tied to progress billing and approvals
03
Substantial Completion
Owner inspection and release of partial retainage
04
Final Accounting
Submit final cost report and close-out documentation
Common mistakes to avoid when preparing a Cost Plus Contract
- Leaving reimbursable cost categories undefined, which leads to disputes over what is billable and increases change orders.
- Failing to require receipts or timekeeping records, which prevents effective auditing and can produce unverifiable charges.
- Omitting a clear fee or markup formula, creating ambiguity about contractor profit on subcontracted work or purchased materials.
- Neglecting to set change order approval thresholds, resulting in unauthorized work and unexpected owner costs.
Penalties and risks from incorrect or incomplete contracts
Cost Overruns:
Owner bears excess costs
Payment Delays:
Undefined billing leads to late payments
Disputes:
Ambiguity increases litigation risk
Audit Failure:
Missing receipts can void reimbursements
Lien Exposure:
Improper notices may forfeit lien rights
Regulatory Noncompliance:
Public projects may breach procurement rules
How Cost Plus compares with other contract types
| Criteria | Cost Plus | Lump-Sum | Time-and-Materials |
|---|---|---|---|
| Price certainty | low | high | medium |
| Risk allocation | owner bears cost risk | contractor bears cost risk | owner bears variable cost risk |
| Change orders | easier | difficult | frequent |
| Best for | uncertain scope | well-defined projects | short-term or repair work |
Selected eSignature vendor comparison for signing and distributing Cost Plus Contracts
| signNow | DocuSign | Adobe Sign | PandaDoc | HelloSign | |
|---|---|---|---|---|---|
| Starting Price | $8/user/mo | $15/user/mo | $14/user/mo | $19/user/mo | $15/user/mo |
| Free Trial | 7-day free trial | Varies by plan | Varies by plan | Varies by plan | Varies by plan |
| Bulk Send | Yes | Yes | Yes | Yes | Varies |
| Audit Trail | Yes | Yes | Yes | Yes | Yes |
| HIPAA Compliant | Yes | Yes | Yes | No | No |
Frequently asked questions about Cost Plus Contracts
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Are Cost Plus Contracts legally enforceable?
Yes. Cost Plus Contracts are enforceable when signed by parties with capacity and proper intent; electronic signatures meet U.S. rules under the ESIGN Act (15 U.S.C. ch. 96) and most state UETA laws.
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How should markups be calculated?
Specify the markup method in the contract (percentage of cost, fixed fee, tiered markup). Be explicit whether markups apply to subcontractors, materials, or both to prevent disputes.
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Can I use electronic signatures for these contracts?
Yes. Electronic signatures are valid under ESIGN and UETA for most commercial contracts. Ensure consent, attribution, and reliable retention of the signed record.
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What documentation should support invoices?
Include itemized receipts, timesheets, subcontractor invoices, material invoices, and bank statements where required by the contract and owner audit rights.
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When are preliminary notices required?
Preliminary notice and lien rules vary by state; include them in the contract and follow state procedures to preserve lien rights.
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How long should I retain contract records?
Keep active contract records through project close and retain archives for at least 3 years for tax purposes (IRC §6501(a)) and 6 years for HIPAA-related records (45 CFR §164.530(j)).
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