Drawing errors and construction claims
How drawing errors generate claims, who pays, and what each party can do to prevent them.
Why drawing errors drive so many claims
Construction contracts allocate risk for design documents to the owner under the Spearin doctrine. When a contractor follows the drawings and the drawings turn out to be wrong, the cost of correction normally flows back to the owner, through a change order if discovered in construction, through a claim if not resolved through change order. Drawing errors are the single most common root cause of construction claims by both frequency and dollar value.
Categories of drawing errors and the claims they cause
- Dimensional errors, Wrong measurements lead to ordered material that doesn’t fit, generating change orders and schedule impact
- Missing scope, Work shown nowhere, contractor performs change order at premium pricing
- Spec/drawing conflicts, Different products or methods specified, contractor bids the lower-cost option and claims for the higher-cost interpretation if enforced
- Code violations, Plan check rejects drawings, schedule delays while redesign and re-permit
- Coordination clashes, MEP conflicts discovered in the field, rework and change orders for re-routing
- Sheet inconsistencies, Same element shown differently on different sheets, contractor claims for the more expensive interpretation
- Differing site conditions, Existing conditions not as documented, change order for hidden work
- Late design changes, Revisions issued after award without proper change procedures, generating delay and impact claims
Contract provisions that govern drawing errors
- Order of precedence clause (which document controls when conflicts exist)
- Contractor’s duty to review and report errors during bidding and construction
- Notice provisions for differing conditions
- Change order procedure
- Schedule impact and delay claim procedure
- Designer’s standard of care and liability cap
- Mediation and arbitration provisions
- Limitations period for claims
What contractors should do
- Review drawings carefully at bid and flag obvious errors before lump-sum commitment
- Submit RFIs for ambiguities promptly and keep written records
- Maintain daily reports documenting field conditions and discovered conflicts
- Provide contractually required notice for any condition that may generate a claim
- Quantify cost and schedule impact contemporaneously, not at end of project
- Distinguish between scope changes (compensable) and contractor errors (not compensable)
What owners should do
- Engage thorough designers with strong internal QA/QC
- Fund independent peer review on complex projects
- Manage RFI response time with the designer to keep work moving
- Track change orders by cause and feed back to designer for continuous improvement
- Maintain owner’s representative to manage information flow
- Address known issues promptly rather than letting them ripen into claims
What designers should do
- Maintain rigorous internal QA/QC with independent reviewers
- Issue clean, coordinated, complete documents
- Respond to RFIs promptly and consistently across the project
- Cloud revisions and document the reason for each change
- Carry adequate professional liability insurance
- Don’t cut corners on coordination time to meet schedule
The single most valuable contemporaneous record on any project is the RFI log. Track every RFI by date submitted, date responded, cost impact, and schedule impact. The pattern in the log usually tells the story of why a project went over budget, and provides the documentation if a claim is filed.
Keep exploring
Related references on drawing quality, coordination, and claim prevention.
How document quality drives construction claims overall.
Reviewer roles and checklists for catching errors before issue.
Workflow for keeping every discipline aligned through CDs.
How drawing errors become change orders and how to document them.