Best HOA Management Companies in King County, Washington

King County is served by 64 homeowners association and condominium management companies — community association specialists, not standard rental property managers. The market is led by Real Property Associates, Trestle Community Management and PROPVIVO . Customer ratings average 3.3★ across 42 firms with published reviews (company-wide ratings).

Washington state is home to more than 10,850 community associations — one of the largest state totals in the country — with King County (Seattle metro) containing a substantial share of those HOAs and condominiums. All Washington community associations will be governed by the Washington Uniform Common Interest Ownership Act (WUCIOA, RCW 64.90) beginning January 1, 2028, a transition that affects board governance, financial management, and owner rights statewide. For condominium communities formed before July 2018 — a large share of King County's older condo stock — WUCIOA's professional reserve-study requirement (RCW 64.90.545) already applies as of January 1, 2026, making reserve-study and funding-disclosure fluency a practical vetting criterion when boards evaluate management firms.