EXHIBIT 32

CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350

In connection with the Quarterly Report of Barrett Business Services, Inc. (the “Company”) on Form 10-Q for the period ended June 30, 2007 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned certify, pursuant to 18 U.S.C. § 1350, that:

          (1)          The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

          (2)          The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ William W. Sherertz	/s/ Michael D. Mulholland
William W. Sherertz	Michael D. Mulholland
Chief Executive Officer	Chief Financial Officer
August 8, 2007	August 8, 2007