Second Dwelling Unit Plans

The Planning and Building Department collaborated with the Humboldt Association of Realtors to make construction plans for 4 different secondary dwelling unit (SDU) designs available to the public. Sometimes called mother-in-law units, these designs can provide affordable housing.

Please note these plans are for informational purposes only. The plans as represented here do not meet current California building codes. Prior to approving these plans for construction, applicants must make modifications to meet California codes in effect at the time the application is submitted.