1 EXHIBIT 23.3 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation of our report dated July 14, 1998, on the financial statements of Primo Electric Company, by reference into Integrated Electrical Services, Inc.'s Amendment No. 3 to Form S-4(File No. 333-75139), and to all references to our firm. HERTZBACH & COMPANY, P.A. Owings Mills, Maryland May 26, 1999