Principal and founder
Gregg de Haan
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.
General Contractor, Principal and Founder
3
Superior Courts
Qualified to testify in Sacramento, San Francisco, and Alameda
3
State credentials
California, Arizona, and Montana
5
Memberships
Including ASTM International and NRCA
2006
Consulting since
Litigation and waterproofing consulting
Specialties
Where Gregg focuses.
- 01Repair scopes, cost estimates, and complex defect reports
- 02Plan reviews as they relate to waterproofing above and below grade
- 03High alpine waterproofing, roofing, and general construction
- 04Code compliance reviews
- 05SB800-related building inspections
- 06Property loss recovery
- 07Conflict resolution, mediation, and arbitration support
- 08Expert meeting representation
Current caseload
Testimony
Qualified to testify.
Gregg is qualified to testify in three California Superior Courts. He provides expert witness services for settlement conferences, mediations, arbitrations, depositions, and trial, working for builders, owners, insurance carriers, and attorneys.
Expert witness servicesCalifornia Superior Courts
- 01
Sacramento County
Superior Court
- 02
San Francisco County
Superior Court
- 03
Alameda County
Superior Court
Forums
- 01Settlement Conferences
- 02Mediations
- 03Arbitrations
- 04Depositions
- 05Trial
Roles
- Expert witness
- Forensic consultant
- Construction litigation consultant
- Waterproofing expert
- Code compliance specialist
- Expert meeting representative
- Property loss recovery specialist
Representative experience
Dozens of matters, names withheld.
Gregg’s construction litigation support spans dozens of matters, from the Bay Area and the Sacramento region to Lake Tahoe and the Eastern Sierra.
Described by building type and region only, to protect client confidentiality.
- 01
Homeowner and community associations
Condominium, townhome, and community associations in San Francisco, the East Bay, and the Sacramento region.
Condominiums and multifamily - 02
Mountain resort communities
Owner associations and resort properties in snow country, from Lake Tahoe and Truckee to Mammoth Lakes.
Snow country building - 03
Single-family homes
Single-family home inspections and expert witness work, part of Gregg’s current caseload.
Construction defect investigation - 04
Universities, colleges, and schools
University student housing, community college facilities, and K-12 school district buildings.
Universities and schools - 05
Casinos and resorts
Casino hotel work and vacation resort properties.
Casinos and gaming - 06
Institutional, commercial, and public work
Institutional and commercial buildings, and construction disputes involving public agencies and builders.
Commercial buildings
Background
A lifetime in the building trade.
As a young child, Gregg developed a love for the building trade, learning how to build with his father. Before and after college he developed his skills building homes and problem solving for several high-end builders.
He took a brief break from the construction trade to perform mechanical design and production control at OptiScan Biomedical in Alameda, an infrared optics lab building a blood glucose measuring device. He then returned to the industry with Ryan Associates in San Francisco, where his roles included foreman, special projects and in-house conflict resolution.
In 2006 he began litigation and waterproofing consulting with Weir Andrewson & Associates in San Rafael. He joined Richard Avelar & Associates in Oakland in 2007, where he took a lead expert role in several large-scale construction defect matters.
Today he leads de Haan & Associates Construction Consulting, Inc., the firm he founded, based in Walnut Creek, California.
Career
Present
Principal and Founder
de Haan & Associates Construction Consulting, Inc.Walnut Creek, California
2007 to 2014
Construction Consultant
Richard Avelar & AssociatesOakland, California
2006 to 2007
Construction Consultant
Weir Andrewson & AssociatesSan Rafael, California
2002 to 2005
Foreman, Special Projects, and In-House Conflict Resolution
Ryan AssociatesSan Francisco, California
2000 to 2002
Mechanical Designer and Production Control
OptiScan BiomedicalAlameda, California
Education and memberships
Credentials.
Education
1998
Dominican University of San Rafael
Bachelor of Arts, Political Science and Pre-Law
Additional coursework
San Francisco State University
Professional memberships
- 01Contractors State License Board (CSLB) Industry Expert Program
- 02Western Construction Consultants Association (WESTCON)
- 03ASTM International
- 04National Roofing Contractors Association (NRCA)
- 05The Bar Association of San Francisco
State credentials
- California License #882824: Check it on the CSLB site (opens in a new tab)
- Arizona ROC341972: Check it on the Arizona ROC site (opens in a new tab)
Discuss a matter
Discuss a matter with Gregg.
Tell us about the property, your role, and your deadlines. Please keep confidential details out of a first message.