John S. Mrowiec

John S. Mrowiec

Conway & Mrowiec Attorneys LLLP

Recognized since 2006

Chicago, Illinois

Practice Areas

Construction Law

Litigation - Construction

Lawyer of the Year Badge - 2019 - Litigation - Construction Lawyer of the Year Badge - 2014 - Construction Law
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John S. Mrowiec is a founding partner in the firm of Conway & Mrowiec. Mr. Mrowiec represents project participants in arbitration, litigation, mediation, contract drafting and claim preparation. He has tried, arbitrated or mediated several complex cases throughout the United States, most recently, successfully represented a general contractor to recover a seven-figure claim on an urban school project in a multi-week arbitration against a earth retention subcontractor involving the cause of damages to an adjacent property and loss of efficiency, delay and acceleration damages on impacted project through arbitration award, confirmation, subcontractor’s appeal and collection from appeal bond surety and successfully represented a multiple prime contractor to recover a seven-figure claim in a multi-week arbitration against an owner involving out-of-sequence work on a hospital project caused by owner’s construction manager and loss of efficiency, delay and acceleration damages through award and collection.

Mr. Mrowiec has drafted and negotiated more than one billion dollars in construction, construction management, design/build, design and trade contracts most recently on the largest private mixed use project started in Chicago in five years. Mr. Mrowiec has authored over 110 construction law articles, is a co-author of the chapter on general contractors’ mechanics lien rights in the leading publication concerning Illinois mechanics lien rights, of a chapter on representing the general contractor on Pre-Contract Issues and of a chapter on Delay Claims for “Construction Change Order Claims 2d” in the Wolters Kluwer Construction Law Library.

Mr. Mrowiec was selected by his peers to the initial board of Leading Lawyers Network, to “Best Lawyers in America” and Chambers USA, America’s Leading Lawyers for Business. Mr. Mrowiec also holds a Martindale-Hubbell Rating of ‘AV Preeminent.’ Mr. Mrowiec has addressed construction industry groups on over seventy occasions and authored manuals on the American Institute of Architects’ family of construction contracts and related documents; new developments in construction law; public construction bidding and performance; design/build and construction management contracts and disputes; delay and labor productivity claims; and mechanics lien and payment bond claims.

Since 2000, Mr. Mrowiec has been a member of the Facilities Committee, since 2005, the Board of Trustees, since 2010, Chair of the Facilities Committee, and since 2012, member of the Executive Committee of the Board, of the Francis W. Parker School, Chicago, Illinois.

Reported Cases: Lakewood Prairie, LLC v. Ibarra Concrete Co., 2008 U.S. Dist. LEXIS 46185 (N.D. Ill. 2008) County of DuPage v. Matthei & Colin Associates, 369 Ill. App. 3d 1051 (2d Dist. 2007) Acme Metals, Inc. v. Raytheon Engineers & Constructors, Inc. (In re Acme Metals, Inc.), 257 B.R. 714 (Bankr. Ct. D. Del. 2000) Southwest Financial Bank & Trust Co. v. George Hyman Construction Co., 940 F. Supp. 1331 (N.D. Ill. 1996) United States f/u/b DJM Construction, Inc. v. Rust Engineering Co., 1996 WL 204318 (N.D. Ill. 1996) Mellon Stuart Construction, Inc. v. MWRDGC, 1995 U.S. Dist. LEXIS 3493 (N.D. Ill. 1995) Downey, Inc. v. Bradley Center Corp., 524 N.W.2d 915 (Wis. Ct. App. 1994) In re KNM Roswell LP, 126 B.R. 548 (Bankr. Ct. N.D. Ill. 1991) In re Highland Park Associates LP, 130 B.R. 55 (Bankr. Ct. N.D. Ill. 1991) Mellon Stuart Construction, Inc. v. MWRDGC, 1990 U.S. Dist. LEXIS 7669 (N.D. Ill. 1990)


  • 20 South Clark Street, Suite 1830
    Chicago, IL 60603

Conway & Mrowiec Attorneys LLLP
Headquarters: Chicago, Illinois

2 The Best Lawyers in America® awards

Best Law Firms Badge
Full Firm Profile

Lawyer of the Year Badge - 2019 - Litigation - Construction Lawyer of the Year Badge - 2014 - Construction Law

Named "Lawyer of the Year" by Best Lawyers® for:

  • Litigation - Construction, Chicago (2019)
  • Construction Law, Chicago (2014)

Recognized in The Best Lawyers in America® 2022 for work in:

  • Construction Law
  • Litigation - Construction

Special Focus

  • Arbitration and Mediation
  • Commercial Development
  • Condominiums
  • Construction Disputes
  • Government Contracts
  • Industrial

"John is a very competent, ethical, and professional counsel."

"What most attorneys have to do hours of research to provide direction, John knows off the top of his head. He is extremely intelligent, hardworking, and service oriented, in combination with being business savvy. Their charges are fair and well earned."

- Jeffrey Crane (Crane Construction Co., LLC)

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