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(4) Revocation Of Permit; Appeals: Violation of the performance standards shall be grounds for <br />revocation of the permit. Notice of intent to revoke the permit shall be sent by the director of <br />community development to the permit holder, stating the grounds for revocation. The holder of <br />the permit shall have ten (10) days from the receipt of the notice to file an appeal to the <br />planning commission. Failure to file an appeal within ten (10) days forfeits any challenge to the <br />revocation. At the expiration of the ten (10) day appeal period, the permit shall be revoked. <br />Operation of the accessory apartment shall cease within sixty (60) days from the date of <br />revocation. <br />C. Performance Standards: <br />(1) All remodeling for the addition of the accessory apartment shall be on the inside of the structure. <br />Exceptions to this condition will be made only if the applicant submits exterior elevation <br />drawings determined by the director of community development to be architecturally compatible <br />with adjacent structures. <br />(2) At least four (4) paved off street parking spaces shall be available on the site, in a location <br />other than in a required front yard. <br />(3) Detached accessory structures shall not be converted to living space. <br />(4) Both the principal and accessory unit must meet the applicable standards of the building code. <br />(5) The owner(s) of the residence in which the accessory unit is created shall occupy at least one of <br />the dwelling units on the premises, except for temporary absences. <br />(6) No more than ten percent (10%) of the single-family dwellings in any one block may contain <br />an accessory apartment. A "block" shall be interpreted to be an area enclosed on its perimeter <br />by streets. In some cases, a block may also be bordered by a body of water or a municipal <br />boundary line. <br />(7) If the dwelling utilizes an on site sewage disposal system, additional capacity shall be added to <br />the system if needed for the accessory unit. All systems shall be inspected by a licensed contractor <br />or inspector prior to issuance or renewal of the accessory apartment permit. The system shall be <br />pumped as necessary. <br />(8) House numbers shall be placed on the principal structure to indicate that the structure contains <br />an accessory apartment. <br />Andover <br />Andover does not allow dwelling units separate (in a different structure) from the principal structure. <br />We do allow “mother-in-law apartments” within the principal structure as long as there is access to <br />the “mother-in-law apartment” through an unlocked door. <br /> <br />Columbia Heights <br />The City’s Code does not specifically address Accessory Dwelling Units (mother-in-law apartments) <br />in this context. I copied the section of code that deals with dwellings below: <br /> <br />(D) Dwellings. <br />(1) General requirements. The following standards shall apply to all dwelling units within the city: <br />a. All single-family dwelling units shall be a minimum of 20 feet wide at the narrowest point. <br />b. No accessory building or recreational vehicle shall be used at any time as a dwelling unit. <br />c. basement dwelling (basements without upper floors) shall be used at any time as a dwelling <br />unit.