EXHIBIT 23.1

Consent of Independent Registered Public Accounting Firm

Board of Directors

Smith-Midland Corporation

We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of our report dated March 23, 2005, relating to the consolidated financial statements of Smith-Midland Corporation appearing in the Company’s Annual Report on Form 10-KSB for the year ended December 31, 2004.

/s/ BDO Seidman, LLP

BDO Seidman, LLP

Richmond, Virginia

April 22, 2005