This is perhaps a good time to reflect on the permitting process for backyard cottages in Seattle. In Seattle backyard cottages otherwise known as detached accessory dwelling units, require a full building permit. The building permit process usually takes 3 months for a simple project and can take considerably longer if one is interested in pushing the boundaries of what is allowed or the site is in an environmentally critical area.
Pushing the boundaries is not hard to do because of what is and what is not included in the actual wording of the land use code and inconsistency in interpreting the code from Seattle DPD. Backyard cottages haven't been allowed for long and the code section allowing them is brief and not well vetted. In addition because of the relatively small number being built it isn't a high priority for the city to fix the shortcomings.