Damaged Window from poor construction
Expert Witnesses in Building Construction

Litigation Construction Services

From field investigations to trial, Blackstone provides only the best in customer service to all its clients. Blackstone represents owners, developers, and subcontractors in all aspects of construction and design defect and pre- and post-construction issues.  From field investigation to trial, Blackstone provides its clients with outstanding customer service.

After completing a ground up mixed-use project in June of 2016, we encountered several leaks after the first rains. When the general contractor ignored our pleas for help, we reached out to Blackstone. Time was of the essence to prevent further damage to our new building. The Blackstone team responded quickly and efficiently with state-of-the-art testing to identify locations and the damage resulting from the leakage.

Construction Defect Expert Witness

We Provide Solutions to Construction Defects with Litigation

  • Defect Investigation
  • Cost Estimation
  • Code Compliance Analysis
  • Expert Witness Testimony
  • Hardhat and constrction drawings

    Construction and Design Defect Investigation

    Investigation into the issues surrounding the claims is paramount to the success of the case.  When it comes to construction and design defect investigation, a client can count on exceptional and meticulous investigation from Blackstone.  These services include:

    • Field investigation, including visual inspections and destructive testing
    • Analysis of design and construction documentation to effectively evaluate as-built conditions
    • Determination and allocation of responsibility for building component failures
    • Scope of Repair recommendations
    • Analysis and determination of product failures
    • Professional reports which include photographic evidence and defect analysis
  • Construction Cost Estimation Experts in California

    Cost Estimation

    Blackstone is comprised of individuals with varying backgrounds and experiences.  Our team uses their expertise and current experience in all phases of construction to provide the background and credibility required for an accurate estimate of repair and construction costs.  Blackstone’s current construction experience gives our team an edge as we bring real world numbers to the litigation table. 

  • Level on floor drain showing it is positioned incorrectly.

    Code Compliance Analysis

    Through research and knowledge of the international building code and California building code, the Blackstone team can provide the analysis of applicable local requirements to determine if the project was built in compliance with code specifications. 

  • Water Moisture Testing Tool for water damage in commercial building

    Expert Witness Testimony

    Blackstone’s consultants are experienced and qualified to provide trial, arbitration, and deposition expert testimony.  With our extensive knowledge base in the construction industry, we are able to assist attorneys, both Plaintiff and Defense, in preparing high-quality presentations and exhibits to explain complex construction and building concepts.   As part of Blackstone’s services, our clients can count on our consultants to participate in expert meetings, settlement conferences, mediation and arbitration.  Our Consultants will participate in the analysis of building assemblies and design and defect claims and provide deposition and trial testimony.

Our Litigation Consultants

Our Team of Construction Expert Witnesses Can Help You with Construction Law Issues

David Tognela

Dave has over twenty-five years of experience in the construction industry. His experience includes wood and structural steel for single-family, multi-family, and commercial construction. Dave’s diverse background provides the basis of his work as a construction consultant and expert for construction-defect litigation. His consulting experience includes project management, construction defect analysis, code, and industry standards review and analysis, litigation support, waterproofing consulting, and peer review.

Degrees and Designations:

  • CA Licensed General Contractor – B-663030n B/C27 -947818 B# 1011353 B# 1022662
  • Four Year Construction Management Degree, Camosun College, BC, Canada

If You Are Interested in Working With Us On Your Next Litigation Project, We’d Love To Talk

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We deliver only the best in Construction and Construction Defect Litigation services.


1220 Oakland Blvd. Suite 210
Walnut Creek, CA 94596
Tel 925-718-3126

Hours of Operation

Mon to Fri 8 am - 5 pm
Weekends Closed

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