J Gregory Cahill

J. Gregory Cahill

J. Gregory Cahill’s practice focuses primarily on complex construction litigation and support for residential and commercial developers and contractors. Mr. Cahill also practices in the areas of insurance litigation and coverage and commercial litigation. He represents builders and developers throughout Arizona, New Mexico, and California, including in State and Federal Court and in front of various administrative tribunals and regulatory bodies. He previously practiced in the areas of personal injury and uninsured/underinsured motorist litigation.

Mr. Cahill is a frequent speaker and has served as panelist for various seminars concerning contract formation, construction law, construction defect litigation, lien law, insurance coverage, alternative dispute resolution, and ethics.

Mr. Cahill is licensed to practice in the state courts of Arizona, California, and the District of Columbia. He is also admitted to practice in the United States District Court for the District of Arizona and the United States District Courts for the Northern, Eastern, Central and Southern Districts of California.

Education & Credentials


American University

B.A., International Relations and Law & Society, 1985
  • with honors

Arizona State University

J.D., 1989

Bar Admission

  • Arizona
  • California
  • District of Columbia


  • Best Lawyers in America®
    •  Construction Law and Litigation - Construction, 2013 - 2021
  • Best of Arizona Business
    • Ranking Arizona, 2010
  • Martindale-Hubbell® AV Preeminent® Rating
  • AZ Business Magazine
    • Top Lawyers, 2009

Prominent Assignments

Represented national homebuilders in numerous construction defect mass actions involving multiple and varied defect claims brought by homeowners and ensuring a robust defense of asserted claims and prosecution of subcontractor contractual indemnity and additional insured insurance carrier obligations. Recent examples include the defense of a mass action involving 29 homeowners who alleged that drainage design deficiencies led to flooding of their homes and a 51 home mass action where the homeowners alleged damage from the claimed failure to properly design and construct the homes to address site soils conditions.

Successfully defended the nation’s third largest homebuilder in a wrongful death claim alleged to result from the installation of an allegedly deficient mechanical system at the claimants’ home.

Successfully defended tribally charted waste-water treatment and water supply business from million dollar+ wrongful termination and non-payment claims brought by business management claimant.

Successfully prosecuted differing site conditions and non-payment claims on behalf of a commercial excavation contractor on a federal reclamation project.

Professional Involvement

  • State Bar of Arizona, Member, Construction Law Section 
  • State Bar of California
  • State Bar of the District of Columbia
  • Maricopa County Bar, Construction Law Section, previous Section Vice Chair; Section Board Member
  • Arizona Builders Alliance, Legislative Committee, Community Service Board


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