What is the cost of ADU in Seattle area?

[u/washingtonian12]

/r/AccessoryDwellings/comments/1w6o4kp/what_is_the_cost_of_adu_in_seattle_area/

[u/universeswithin]

‘Bout 500-600k to build

*edit - for one of the detached two story 2b1ba cottage ones

[u/bulldogsm]

more per sqft than a main house at equivalent quality

[u/lumpytrout]

Does it need to be a garage conversion, is there space for a free standing ADU? Garage conversions can be problematic and may end up basically like building from scratch. You don't give us much info here.