seattle backyard cottage blog

Backyard cottages (DADUs) provide opportunities for families, while increasing housing stock density and diversity. Continue reading for more information about Seattle's backyard cottage ordinance or contact us to find out if your lot is eligible for a backyard cottage..

Thursday, October 17

king county reduces the sewer capacity charge for DADUs

King County levies a sewer capacity charge for all new sanitary sewer connections. This fee is paid monthly for 15 years or as a lump sum.

Until recently, backyard cottages (DADUs) were charged a sewer capacity charge equivalent to that of a new full sized residence. In efforts to in make fees more equitable, King County has reduced the fee to 60% of that of a new residence.  Where previously the sewer capacity charge for a DADU was $64.50 per month. The new rate is $38.70.  Representing a savings of approximately $4,644 for a new DADU. Attached accessory dwelling units (ADUs) also pay the sewer capacity charge if they make a new sanitary sewer connection.

King County Sewer Capacity Charge FAQ

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