Accessory Dwelling Units (ADUs) have become an increasingly popular way to add housing options in cities like Mountain View, California. With the high demand for affordable and flexible living spaces, ADUs offer homeowners a great opportunity to generate rental income, accommodate extended family, or increase their property value. However, navigating Mountain View Zoning Laws Simplified and approval process can be challenging. This guide simplifies everything you need to know about where you can build an ADU and how to get approval.
Understanding ADUs: What Are They?
ADUs, also known as granny flats, in-law units, or backyard cottages, are secondary housing units on a single-family or multi-family property. They can be detached, attached to the primary residence, or converted from an existing space such as a garage or basement.
In Mountain View, ADUs are regulated by local zoning laws, which determine where and how they can be built. The city follows California state laws but also has specific guidelines that homeowners must follow.
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Where You Can Build an ADU in Mountain View
1. Single-Family Residential Zones
Homeowners in single-family residential zones (R1) are allowed to build ADUs on their properties. These zones include:
- R1-8 (low-density residential)
- R1-10 (low-density residential with larger lot sizes)
- R1-6 (medium-density residential)
Both detached and attached ADUs are permitted in these zones, as long as they meet setback and lot coverage requirements.
2. Multi-Family Residential Zones
Multi-family zones (R3 and R4) allow the construction of ADUs, sometimes with more flexibility than single-family zones. In these areas, homeowners and developers can build:
- Interior ADUs (converted from existing non-livable spaces like storage rooms or garages)
- Detached ADUs in compliance with lot coverage and open space requirements
- Two or more ADUs on larger multi-family lots, depending on available space
3. Commercial and Mixed-Use Zones
Mountain View permits ADUs in certain mixed-use and commercial zones, provided that residential use is allowed in the area. Property owners must verify zoning restrictions with the city planning department before starting an ADU project.
4. Historic and Special Districts
ADUs may be restricted in historic districts or areas with specific design guidelines. In such cases, additional approvals may be required to ensure the new unit maintains the area’s aesthetic and historical significance.
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ADU Size and Design Requirements
Once you confirm that your property is eligible for an ADU, you must comply with the city’s size and design regulations.
Size Limits
- Detached ADUs: Up to 1,000 sq. ft. on most lots, but some larger lots may allow up to 1,200 sq. ft.
- Attached ADUs: Cannot exceed 50% of the primary dwelling’s floor area, up to a maximum of 1,200 sq. ft.
- Junior ADUs (JADUs): Limited to 500 sq. ft. and must be created within the existing primary residence.
Setbacks and Lot Coverage
- Rear and side setbacks: At least 4 feet for detached ADUs.
- Front setbacks: Vary based on zoning but typically match the primary residence setback.
- Lot coverage: The total building coverage must comply with zoning limits, which often range from 40-50% of the lot area.
Height Restrictions
- Detached ADUs: Maximum height of 16 feet, but up to 18 feet may be allowed for two-story ADUs in some areas.
- Attached ADUs: Must comply with the height restrictions of the primary residence.
Parking Requirements
- No additional parking is required if the ADU is within a half-mile of public transit, part of an existing structure, or in a historic district.
- Otherwise, one off-street parking space may be required for the ADU.
Owner-Occupancy Requirement
As of 2020, Mountain View does not require owner-occupancy for ADUs, meaning homeowners can rent out both the main house and the ADU if desired.
How to Get Approval for an ADU in Mountain View
Step 1: Verify Zoning and Requirements
Before starting your ADU project, check your property’s zoning classification and ADU eligibility. The City of Mountain View provides zoning maps and planning resources online.
Step 2: Prepare Your ADU Design Plans
Work with a licensed architect or designer to draft ADU plans that comply with city regulations. The plans must include:
- Site plan (showing property boundaries and structures)
- Floor plan
- Elevations and exterior design details
- Utility connections and drainage plans
Step 3: Submit Permit Applications
Homeowners must submit the following applications to the Mountain View Planning and Building Department:
- Planning Permit Application (if required for special cases like historic districts)
- Building Permit Application (for all ADUs)
- Fire Department Review (if necessary for larger ADUs)
Step 4: City Review and Approval
The city will review the ADU plans for compliance with zoning and building codes. This process usually takes 4-8 weeks, depending on project complexity and permit backlogs.
Step 5: Obtain Permits and Begin Construction
Once permits are approved, homeowners can begin construction. A licensed contractor must follow the approved plans, and periodic city inspections will be required.
Step 6: Final Inspection and Approval
After construction is complete, a final inspection ensures compliance with building codes. Once approved, the city issues a Certificate of Occupancy, allowing the ADU to be legally rented or occupied.
Common Challenges and How to Overcome Them
1. Navigating Permit Delays
If your permit is delayed, check in with the city to see if additional documents or revisions are needed. Hiring an experienced ADU consultant or architect can help streamline the process.
2. Meeting Utility Requirements
Connecting an ADU to utilities (water, electricity, and sewer) can be complex. Plan ahead to ensure proper connections and avoid unexpected costs.
3. HOA Restrictions
If your property is in a homeowner’s association (HOA), verify whether ADUs are allowed under their regulations before proceeding.
Contact SkyTechBuilders Today for Your Remodeling Needs!
Building an ADU in Mountain View is a great way to maximize property value and create additional housing options. By understanding zoning laws, size limitations, and the approval process, homeowners can successfully navigate the process and complete their ADU project with ease.
If you’re considering adding an ADU, consulting with a professional builder or architect who specializes in ADUs can make the process much smoother. With proper planning, you can transform your property into a functional and valuable space that meets your housing needs.
For more information, visit the Mountain View Planning and Building Department website or consult with a local ADU expert to get started on your project today.
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