About the firm
Founded on industry experience and integrity.
After several years as a litigation consultant, studying under well-known litigation consultants and Bay Area builders, Gregg de Haan founded his own firm.
Why the firm exists
Built for the challenges of the building trade.
The building trade faces many challenges: crew coordination, tight schedules, adverse building environments, fiscal constraints, and challenging design, which often lead to construction defects. With those challenges in mind, de Haan & Associates Construction Consulting was established. The firm is based in Walnut Creek, California.
Today the firm is a full-service forensic construction consulting practice, providing investigation, research, and litigation services for the construction industry. We are retained by attorneys, insurance carriers, building owners, homeowner associations, and contractors in California, Arizona, and Montana.
Our philosophy
“The firm’s philosophy is simple: bring together a group of experts, much as a building brings together its trades, to reach a balanced, educated opinion for fair resolution.”
Pillar I
Industry Experience
Our associates are active in the building trades, familiar with current building materials, and well versed in the construction documentation process.
Pillar II
Integrity
Accurate, organized information. Our goals in any dispute are clarity and accuracy, so advocates can work toward a resolution backed by solid, well-presented research, analysis, and information.
The firm is founded on two basic concepts: industry experience and integrity.
Construction litigation support
As clear to attorneys as it is to building professionals.
Building envelope and construction problems sometimes need to be resolved through litigation or arbitration. When that happens, information has to be presented in a way that makes as much sense to attorneys as it does to building professionals.
Our goals in any dispute are clarity and accuracy, which allows advocates to work toward a resolution backed by solid, well-presented research, analysis, and information. Our team of associates regularly provides case development and testimony services for litigation.
Expert witness services for
- 01Settlement Conferences
- 02Mediations
- 03Arbitrations
- 04Depositions
- 05Trial

Leadership
Gregg de Haan
General Contractor, Principal and Founder
Gregg is the founder and principal of de Haan & Associates Construction Consulting. His primary role is to lead field investigations, gather field data, attend expert meetings, mediations and arbitrations, prepare field testing data for trial, and testify at trial as an expert witness retained by owners and builders.
Full profileCredentials
Serving California, Arizona, and Montana.
Discuss a matter
Because experience matters.
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