A defect claim turns on what was built, not what was drawn. Comparing installed conditions with the contract documents, the building code, and the manufacturer instructions is where it starts.
Defect AnalysisDefect AnalysisDefect Analysis
Construction Defect Expert Witness
Paul Gaston gives retaining counsel, insurers, owners, and contractors independent opinions on workmanship, contractor standard of care, building code compliance, and water and moisture conditions across Chicago, Cook County, and Chicagoland, measured against codes, recognized standards, manufacturer installation instructions, and three decades of licensed field experience.
Code ComplianceCode ComplianceCode Compliance
Code and Accessibility Review
As-built conditions measured against the applicable building code, ADA requirements, and the manufacturer installation instructions governing the work.
Water IntrusionWater IntrusionWater Intrusion
Water Intrusion and Moisture
Forensic inspection of envelope and installation workmanship, identifying moisture sources and documenting the conditions that produced the damage.
Workmanship Review
Trade work measured against contract specifications.
Contractor Standards
Whether means and methods met accepted practice.
Moisture and Envelope
Water intrusion, condensation, and moisture sources.
Reports and Testimony
Repair scope, cost of repair, and expert testimony.
%
Independent Analysis
Our ApproachOur ApproachOur Approach
Opinions Grounded in Field Experience
Every opinion ties an observed condition to a code, a standard, or a manufacturer instruction.
- Licensed Builder
- Code Anchored
- Documented Findings
- Field Tested
Scope stays inside licensed contracting and carpentry, never engineering or architectural design.
- Workmanship
- Standard of Care
- Building Codes
- ADA Access
Three decades of Chicago and Cook County commercial, municipal, healthcare, and retail construction inform every inspection.
- Journeyman Carpenter
- Licensed GC
- O’Hare Renovation
- Cook County Focus
Our ServicesOur ServicesOur Services
Where Construction Defect Cases Turn
Whether the installed work met contract specifications, codes, and accepted trade practice.
How the contractor sequenced, coordinated, and executed the work against industry practice.
As-built conditions reviewed against the Chicago building code that governs them.
Moisture sources traced to installation workmanship, envelope detailing, and condensation.
Whether inspection and quality-control protocols were actually followed during construction.
Scope and reasonable cost to correct defective work, supported by written documentation.
Our ProcessOur ProcessOur Process
How a Matter Moves Forward
01/
Case Intake
Confirming scope and clearing conflicts.
02/
Records Review
Plans, specs, and contracts.
03/
Site Inspection
Forensic inspection and moisture readings.
04/
Code Analysis
Measured against codes and standards.
05/
Expert Report
Written findings, opinions, and repair cost.
06/
Testimony
Deposition, arbitration, and trial testimony.
Common QuestionsCommon QuestionsCommon Questions
Questions Attorneys Ask
Workmanship, contractor standard of care, building code compliance, and water intrusion matters. Paul reviews how the work was built and installed, not how it was designed.
No. Paul is a licensed Chicago general contractor and union journeyman carpenter, so his opinions stay within workmanship, means and methods, and code compliance.
Chicago and Cook County primarily, and the wider Chicagoland area. He has also been retained elsewhere in Illinois, including Will County.
Records and document review, a forensic site inspection, analysis against codes and manufacturer instructions, a written report with repair scope and cost, and testimony.
Yes. Estimating the scope and reasonable cost to correct defective work sits squarely within a licensed general contractor's role.
Yes. Paul provides written reports, rebuttal, deposition, arbitration, and trial testimony.
Practice AreasPractice AreasPractice Areas
Where These Matters Arise
Defect claims surface across Chicagoland property types. The review method stays the same throughout.
Commercial
Residential
Envelope, finishes, and occupied-space renovation work.
- Flooring Systems
- Water Intrusion
- Finish Carpentry
- Code Compliance
Scope set per matter
Fit-out workmanship, accessibility routes, and finish defects.
- Doors and Hardware
- Millwork Defects
- ADA Transitions
- Standard of Care
Scope set per matter
Renovation in occupied facilities, phasing, and inspection review.
- Occupied Phasing
- Quality Control
- Moisture Readings
- Repair Scope
Scope set per matter
Common-element defects, balcony envelope, and unit finish work.
- Envelope Leaks
- Flooring Failures
- Condensation Sources
- Cost of Repair
Scope set per matter
Builder workmanship, installation defects, and water entry claims.
- Roof and Flashing
- Window Installation
- Trim and Millwork
- Moisture Damage
Scope set per matter
Party-wall detailing, shared envelope, and finish installation review.
- Shared Envelope
- Stair and Rail
- Egress Elements
- Report and Cost
Scope set per matter
Our NetworkOur NetworkOur Network
Our Other Brands

Building Code
chicagobuildingcodeexpert.com
Building code review of as-built and installed conditions, carried out from a licensed builder’s perspective and measured against the code edition that applied when the work was performed.

Water Intrusion
chicagowaterintrusionexpert.com
Water entry, condensation, and moisture-source identification tied to installation workmanship and envelope detailing, with mold inspection available as supporting capability.

ADA Compliance
chicagoadacomplianceexpert.com
Accessibility of built conditions, covering walking surfaces, ramps, transitions, and access routes as they were actually constructed and installed on site.

Construction Safety
chicagoconstructionsafetyexpert.com
Site safety, means and methods, and construction quality-control review drawn from three decades of commercial, municipal, healthcare, and retail work, including renovation inside fully operational facilities.
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