ADU Knowledge
June 8, 2024

What’s the Biggest ADU I Can Build in Los Angeles City?

Argi Avetisyan
Argi Avetisyan
Gather ADU expert
What’s the Biggest ADU I Can Build in Los Angeles City?
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Accessory Dwelling Units (ADUs) are rapidly gaining traction among Los Angeles homeowners and real estate investors, offering flexibility and lucrative income opportunities. Whether your goal is to construct a guest house, office space, rental unit, or personal studio, understanding the intricate regulations and possibilities surrounding ADU construction is paramount. Let's delve into the specifics of ADU size limits, evolving regulations, cost considerations, and how to successfully navigate the process in Los Angeles.

ADU Size Restrictions in Los Angeles:

Detached ADUs:

  • Maximum size: 1,200 square feet
  • Minimum size: 150 square feet This broad range allows homeowners to tailor the ADU to their specific needs. Detached ADUs are  also subject to height restrictions, typically capped at two stories or 25 feet in height, per zoning regulations.

Attached ADUs:

These units operate under a different set of guidelines. Their size cannot exceed 50% of the main property's square footage. However, it's crucial to note that regardless of the main property's size, a two-bedroom (or larger) attached ADU up to 1,000 square feet is always permitted.

Recent Regulatory Changes Favoring ADU Construction:

California has witnessed significant regulatory shifts that have streamlined the process for constructing ADUs, particularly in Los Angeles. These updates encompass:

  1. Parking Requirements:  New guidelines have relaxed the parking requirements for ADUs, making it  easier for homeowners to secure approval for their projects.
  2. Maximum Size Expansion: The permitted size for ADUs has expanded to a maximum  of 1,200 square feet, providing greater flexibility.
  3. Diverse ADU Types: There is now a wider range of ADU types allowed, encouraging innovative  and varied uses for these structures, catering to diverse needs.

These changes have made it more feasible for homeowners to explore ADU construction without being burdened by overly restrictive regulations, unlocking new opportunities. Schedule a free consultation

Why Homeowners are Drawn to ADUs:

ADUs offer incredible versatility, serving multiple purposes tailored to individual needs:

  • 1-Offices
  • 2-Guest Houses
  • 3-Studios
  • 4-Recreation Spaces (e.g., "Man Caves")
  • 5-Rental Units

Whether you require extra space to accommodate family members or aspire to generate rental income, ADUs provide a versatile solution to address your unique requirements.

Homeowners in Los Angeles have several options for ADU construction:

  1. Garage Conversions: A cost-effective method where     existing garages are transformed into livable spaces. This approach   involves building the fourth wall (where the garage door currently     resides), adding interior components such as walls, kitchen, bathroom,  flooring, and installing windows, doors, plumbing, electrical systems,  HVAC, and insulation. Additionally, a new sewer line must be connected to  the main home. The cost for garage conversions typically ranges from $95,000  to $120,000, depending on the homeowner's specific requirements.
  2. New Constructions: These ADUs can be either attached or detached, single or multi-story structures, offering greater flexibility but at a higher cost. Building a new ADU can be more expensive, with costs  ranging from $150,000 to $400,000. Factors influencing these costs include the size of the unit, the number of stories, location and access, quality  and style of materials (both interior and exterior), permit costs and city  fees, and proximity to utilities. As a general rule of thumb, the cost per  square foot ranges from $300 to $450, with larger spaces typically costing  less per square foot. It's important to note that adding a second story  will significantly increase costs.

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Financing Your ADU Project:

Several financing options are available for ADU construction, including:

  • Personal Savings
  • Home Equity Lines of Credit
  • Construction Loans
  • Renovation Loans

Choosing the right option depends on your individual financial situation and specific needs.

Finding the Right Team: Hiring a Los Angeles ADU Contractor:

Selecting a qualified contractor is crucial for a successful ADU project. Here are some tips:

  1. Local, Licensed General Contractors: Choose contractors who are experienced with ADU projects and familiar with local regulations. Their expertise will ensure a smooth and compliant construction process.
  2. Experience Matters: Ensure the contractor has extensive experience with additions and garage conversions to avoid potential pitfalls and ensure a seamless project execution.
  3. Check Credentials: Verify licenses, insurance coverage, references, and online reviews to ensure you're hiring a reputable professional with a proven track record.

Los Angeles ADU Regulations:

Allowed Locations: Generally, ADUs are allowed on properties zoned for residential use, with few exceptions. Your property must have an existing or proposed single-family home or a multi-family building.

Minimum Lot Size: There are no minimum lot size restrictions for constructing an ADU in Los Angeles. The city encourages ADU construction on smaller lots to increase housing availability and diversity.

Owner Occupancy Requirements: Previously, Los Angeles required homeowners to live in one of the units on the property. However, recent changes have relaxed this requirement, allowing ADUs to be built solely for rental purposes.

Number of ADUs Allowed:

  • Single-Family Properties: Generally, one or two ADUs are permitted.
  • Multi-Family Properties: The number of ADUs allowed  depends on the type of ADU and the existing number of dwelling units.

Navigating the ADU Construction Process in Los Angeles:

Constructing an ADU can be overwhelming, but with the right team and a comprehensive understanding of regulations, homeowners can navigate the process successfully. Here are a few key steps to consider:

  1. Research: Familiarize  yourself with local regulations and requirements to ensure compliance.
  2. Design:  Work closely with your contractor to develop plans that meet your needs and comply with all regulations.
  3. Permitting:  Apply for necessary permits from the city planning department, providing all required documentation and plans.
  4. Construction:  Begin construction according to the approved plans, adhering to all  guidelines and regulations.
  5. Inspection:  Schedule inspections throughout the construction process as required by  the city to ensure compliance and safety.
  6. Final Approval: Once all inspections are passed, you will receive final approval from the city, allowing you to utilize your  newly constructed ADU.

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Additional Regulatory Considerations:

Maximum Height: You can generally build an ADU up to one story and 16 feet in height. However, additional restrictions may apply depending on your property's location and zoning. It's best to check with the city planning department for specific guidelines.

Fire Safety Requirements: All ADUs must meet California fire safety requirements, including the installation of smoke detectors, carbon monoxide detectors, fire sprinklers (if required), and fire-rated walls.

Minimum Setbacks:

  • Attached/Detached ADUs: Must be at least 4 feet from the property's side and rear lines.
  • Conversion ADUs/Junior ADUs: Must ensure adequate fire  safety distances.

Parking Requirements:

  • Conversions/Junior ADUs: Generally do not require  parking.
  • Attached/Detached ADUs: Require one parking space unless exempt. Consult our experts for specific guidance on your project.

Costs of Building an ADU in Los Angeles:

  • Garage Conversions: $95,000 - $120,000
  • New Constructions: $150,000 - $400,000

Keep in mind that these costs can vary significantly depending on individual needs and preferences. It's always best to get a detailed quote from a licensed contractor to accurately estimate the expenses for your specific project.

Cost Per Square Foot: $300 - $450per square foot is a good rule of thumb for budgeting purposes, but this can vary based on various factors, such as the quality of materials, finishes, and other project-specific requirements.

Additional Costs to Consider:

  • Quality of Materials: Flooring, cabinets, tile,  lighting, and other interior materials can significantly impact the  overall cost.
  • Exterior Materials: Roofing, stucco/siding, hardscape,  landscape, and other exterior elements contribute to the total expense.
  • Permit Costs: City requirements and fees must be factored into your budget.
  • Utility Proximity: The distance to existing utilities on the property can influence costs. Consult our experts for personalized guidance.

Frequently Asked Questions (FAQs):

Can I rent out my ADU?

Yes! In fact, many homeowners build ADUs specifically for rental income or to accommodate extended family members. However, most cities restrict short-term rentals, typically allowing only long-term rentals of a month or longer.

Do I need a permit to build an ADU?

Generally, yes. You will need to apply for and obtain the necessary permits from the city planning department before beginning construction.

What is the typical size of an ADU?

ADUs can vary in size depending on individual needs and the available space. However, they typically range from 300 to 1,200 square feet.

 Schedule a free consultation

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