Exhibit 23 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM The Board of Directors Washington Banking Company We consent to the incorporation by reference in the registration statements on Form S-8 (No. 333-129647, No. 333-57431 and No. 333-72436) of Washington Banking Company and Subsidiaries of our report dated March 6, 2006, relating to the financial statements, management's assessment of the effectiveness of internal control over financial reporting and the effectiveness of internal control over financial reporting, which appears in this Annual Report on Form 10-K. /s/ MOSS ADAMS LLP Bellingham, Washington March 10, 2006