Main Component of the Project
Residential Addition/Accessory Structure
153 Richardson Dr., Mill Valley
Assessor's Parcel 043-071-14
The applicant requests Variance and Design Review to construct a new 540 square foot attached garage, a new 78 square foot addition and a conversion of the existing 528 square foot garage on the first floor, a new 338 square foot addition and new decks on the second floor, a new 1,475 square foot third floor addition with decks, on a lot developed with a single-family dwelling in Mill Valley. The 2,341 square feet of proposed building area – of which 1,813 square feet is floor area – would result in a floor area ratio of 41 percent on the 10,290 square foot lot. The proposed building would reach a maximum height of 38 feet, 6 ½ inches above surrounding grade.
Variance approval is required pursuant to Marin County Code Section 22.54.020 because the project entails constructing additions that would exceed the maximum allowable FAR of 30 percent. Design Review approval is required pursuant to Section 22.42.020.D because the amount of proposed demolition of the existing residence would return this property a vacant lot and the building site is substandard per the slope regulations (in compliance with Section 22.82.050 Hillside Subdivision Standards). Additionally, Design Review approval is required pursuant to Section 22.20.060.E.2 because a dwelling in a R1 (Residential Single-Family) zoning district may be increased in height without Variance approval by a maximum of 10 feet when side setbacks of 15 feet or greater are provided, subject to the regulations of Chapter 22.42 (Design Review).
Land Use Info
Zoning: R1 (Residential Single Family)
Countywide Plan Designation: SF6 (Low Density Residential)
Community Plan: Strawberry