EXHIBIT 23 CONSENT OF INDEPENDENT AUDITORS We consent to the incorporation by reference in the Registration Statement (Form S-8 No. 33-38118) pertaining to the LESCO, Inc. Stock Investment and Salary Savings Plan and Trust of our report dated May 24, 2002, with respect to the financial statements and schedule of the LESCO, Inc. Stock Investment and Salary Savings Plan and Trust included in this Annual Report (Form 11-K) for the year ended December 31, 2001. /s/ Ernst & Young LLP Cleveland, Ohio June 24, 2002