Aston Design Review (P3661)

Community Development Agency

Summary

Main Component of the Project

Residential Addition/Accessory Structure

Location

325 Melrose Ave., Mill Valley
Assessor's Parcel 048-031-03

Status

Incomplete

Project Planner

Joshua Bertain
415-473-3171

Applicant

Julie Johnson
415-246-6194

Project Description

The applicant requests Design Review approval to construct: (a) a new 433 square foot detached Accessory Dwelling Unit (ADU) in the rear yard, and (B) a new deck that would be located above a proposed carport (not subject to Design Review) proposed in the front yard of a property developed with an existing residence in an unincorporated area of Mill Valley. The 433 square foot ADU would result in a floor area ratio of 35 percent on the 8,002 square foot lot. The height and setbacks of the proposed structures are provided below.

  1. The proposed ADU would reach a maximum height of 21 feet, 7 inches above the surrounding grade and the exterior walls would have the following setbacks: more than 100 feet from the western front property line; 6 feet, 9 inches from the northern side property line; 1 foot, 8 inches from the southern side property line; and 7 feet from the eastern rear property line.
  2. The proposed deck would be located directly above the proposed carport. The surface level of the deck would reach a maximum height of 10 feet, 6 inches above the surrounding grade and the exterior walls would have the following setbacks: 3 feet, 5 inches from the western front property line; 8 feet, 8 inches from the northern side property line; 17 feet, 1 inch from the southern side property line; and more than 100 feet from the eastern rear property line.

Various site improvements would also be entailed in the proposed development, including a small addition to the existing residence, new walkways at grade, and a new fence.

Design Review approval is required pursuant to Section 22.54.045 and 22.42.020.B of the Marin County Development Code because the project entails constructing a detached ADU that would not conform to the setbacks or height limit established by the governing R1 zoning district. Additionally, the proposed deck is subject to obtaining Design Review approval because the deck projects into the required front yard setback established by the governing zoning district.

Land Use Info

Zoning: R1 (Residential Single Family)
Countywide Plan Designation: SF6 (Low Density Residential)
Community Plan (if applicable): Tamalpais

Most Recent Project Plans

Aston PLANS 9.22.22
Interagency Referral