Contact the Development Services Office

Development Services Office

The DSO Walk-In Center on the 27th floor of the Seattle Municipal Tower is permanently closed, but we are still open for business! You can contact us during our regular business hours at or (206) 684-3333, Monday through Friday, 8 am – 5 pm.

Other questions

Waterline inspections: (206) 684-5803
Billing questions: (206) 684-3000

Utility System Improvement Disputes