EXHIBIT 23.1 Consent of Independent Certified Public Accountants We hereby consent to the use in this Form 10-K of our report dated February 1, 2002, which appears on page F-3, relating to the financial statements (not presented separately in the Form 10-K) of KSW, Inc. and Subsidiary. Marden Harrison & Kreuter CPAs P.C. White Plains, New York March 28, 2003