Built on decades of experience, Donan Engineering, LLC delivers actionable intelligence through forensic engineering investigations with exceptional reports that answer complex questions about property loss.
Donan Engineering, LLC (Donan) leverages the latest in technology to provide scientific insight into a variety of property losses with perils including wind, lightning, hail, fire, flood, water, and more. Our nationwide team of licensed engineers investigates properties that include industrial, commercial, residential, or are new construction or historic. Donan’s expertise spans across all facets of the property – from the roof to the foundation, from the gates that protect assets to the wires in the walls.
In addition, our windows assessment capabilities equip us to investigate a vast scope of window damage, including manufacturing defects, age-related deterioration, hail impacts, water intrusion, wind damage, and window fogging. Understanding why some windows fail and how different window types may make a difference can help avoid unnecessary, expensive replacements.
- Collapse
- Deterioration due to Time
- Electrical Failures
- Equipment Failures
- Impact Damages
- Water Intrusion and Moisture
- Weather Damage
- Window Assessments

Why Thousands Trust Donan
Donan’s licensed engineers are equipped to answer complex questions about property damage. Our team is prepared to objectively investigate a variety of property types and deliver actionable intelligence and conclusive insights detailing the cause of loss, providing unbiased clarity to all parties.
Rely on Donan to assist you with your complex property losses. Submit an assignment today!
Forensic Engineering Claim Resources
Ponding Water Case Study
Learn how Donan’s assessment helped resolve a ponding water concern, preventing potential structural damage and ensuring compliance with state building codes.
Residential Roof Tour
Learn about the anatomy of residential roofs and prepare for roofing claims by exploring this interactive guide. Plus, download a labeled roof diagram for reference.
Why Are My Policyholders’ Windows Leaking? Causes of Loss That Impact Claims
Age-related deterioration, poor installation, and manufacturing defects can all cause windows to leak. Learn more about what investigators look for, and how these can affect claims.



