When the accessory dwelling unit is wholly contained within a basement or attic of the primary dwelling unit, this limitation does not apply. Changes to height and parking restrictions are also part of the updated code. Adus must not exceed 1,000 sq
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Of heated floor area and 1,000 sq
If built within a basement or attic, the size limit does not apply.
In this guide, we’ll break down hb 1337 and explain how it impacts adu and dadu construction in seattle, bellevue, and other parts of king county Whether you’re planning a backyard cottage, a basement apartment, or a garage conversion, this law opens up exciting new opportunities for homeowners. Yes, but your adu cannot exceed 800 square feet or 40% of the area of the primary dwelling’s living area, whichever is less It can be larger depending on the zoning of your property.
If the lot is smaller than these minimums, or if it contains more than one primary dwelling, the adu must be attached to the primary dwelling, or wholly contained in its basement or attic. An adu in king county water district no 90 (district) must be lawful and permitted through the agency having land use permitting authority For the district, this would be the city of renton or king county.
Permits ensure that your project complies with local building codes and regulations (and also allow you count that square footage as living space when you sell the property or have it appraised)
Here are adu regulations for king county, or check with your local city/county. Starting july 1, seattle will no longer require adus to be attached to a primary residence Homeowners can now build up to three separate structures, and the maximum size of an adu will increase to 1,500 square feet
