ADU Cost in Los Angeles: Construction, Permits and Design

The cost for an accessory dwelling unit (ADU) in Los Angeles can range from $50,000 to $400,000 or more.

There are a number of factors that can impact ADU costs in Los Angeles, and we’ll take a look at those factors as well as how to reduce costs. We’ll also focus on the long-term financial benefits of owning an ADU in L.A. Let’s dive in!

How Much Does It Cost to Build an ADU in Los Angeles?

As we mentioned, the average cost to build an ADU in Los Angeles can range from $50,000 to over $400,000. This all depends on a number of factors like the overall size, materials used, design, location, and more. Here’s a breakdown of varying levels of build as well as the cost ranges we typically see.

Basic-Level ADU Build: On average, $50,000 - $150,000

Overview: A basic build will typically include a straightforward design and low-cost materials such as vinyl flooring, entry-level cabinetry, and more affordable appliances. There is typically limited customization and minimal upgrades.

Mid-Level ADU Build: $150,000–$250,000

Example: If you’re interested in a mid-level build, you’ll typically find a more enhanced finish and design with upgraded features including quartz countertops, hardwood floors, and upgraded appliances. 

High-Level ADU Build: $250,000–$400,000

Example: At the other end of the spectrum, you’ll likely see full custom designs and the best finishes, including marble countertops, top of the line appliances, and upgraded fixtures.

Let’s look into how the costs are distributed for different factors:

Construction: 60–70% (includes framing, roofing, and structural elements)

Permits: 5–10% (building permits, utility connection fees, and inspections)

Design and Engineering: 10–15% (architectural plans and structural engineering)

Materials: 15–20% (flooring, cabinets, countertops, and finishes)

Labor: 20–30% (contractor fees, plumbing, and electrical work)

Utilities: 10–15% (installation or extension of plumbing, gas, and electrical systems)

Landscaping and Miscellaneous: 5–10% (site prep, driveways, and other details)

The cost for an ADU also depends on the square foot of land you own. Here are the typical costs for the following sites:

1. 400 square feet: $50,000–$120,000
2. 600 square feet: $100,000–$150,000
3. 800 square feet: $120,000–$200,000
4. 1000 square feet: $150,000–$250,000
5. 1200 square feet: $180,000–$300,000

What Factors Influence the Cost of an ADU in Los Angeles?

The factors influencing the cost of an ADU in Los Angeles include the type of ADU you choose, the size and design, the quality of materials and finishes, and any additional appliances or fixtures you add. 

These factors will impact how much you’ll spend on your new ADU in Los Angeles. Let’s go through each to help you plan your budget.

Type of ADU

The type of ADU you choose will affect the overall construction budget. There are several options of ADU you can choose from:

• Detached ADUs: Require new foundations, walls, and roofing. It costs from $150,000 to $400,000 due to the need for full-scale construction.
• Attached ADUs: They are built as extensions to an existing structure. These often are more cost-effective than detached units, starting at $100,000.
• Garage Conversions: Typically the cheapest option, ranging from $50,000 to $120,000. Costs depend on the garage’s condition and upgrades like plumbing and insulation. Contact us today for the best garage conversions in Los Angeles. 
• Prefabricated ADUs: Prefabs will reduce labor costs but require site prep and transportation fees, with costs ranging from $70,000 to $150,000

Tip: If your goal is to save on construction cost and labor expenses, prefabricated ADUs might be the way to go.

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Size and Design

The size and design of your ADU are about 10-15% of your total budget. Larger units can take up more of your budget, while smaller units require less. Here are the different sizes and design options you can look for:

• Basic Layouts: Simple designs with minimal customization cost $150–$250 per square foot.
• Custom Designs: Complex architectural elements, like vaulted ceilings or high-end finishes, increase costs to $300–$500 per square foot.
• Multi-Room Designs: Adding multiple rooms or bathrooms increases the total cost of the build. For example, a 2-bedroom ADU typically costs $200,000–$350,000.

Tip: Look for professionals who can help with designs that balance functionality and affordability to help control costs.

Materials and Finishes

Material choice is one of the biggest impacts to the overall cost of the project. Material costs can range widely, from $10,000 to $50,000 or more. Standard materials can cost anywhere between $10,000 -$15,000 on average, which likely includes laminate countertops and vinyl flooring. Premium materials include marble counters and custom cabinetry and may cost above $50,000.

Tip: Use mid-range materials for durability without overspending.

Appliances/Fixtures

The appliances and additional fixtures you add to your ADU are completely optional. However, they can improve both the functionality and aesthetics of your ADU. Basic appliances and fixtures, such as standard sinks and faucets, cost $2,000–$5,000. High-end fixtures like smart refrigerators or premium lighting can cost over $20,000.

Tip: Invest in energy-efficient appliances to lower long-term utility bills.

Utilities

Utilities are also a big expense when constructing an ADU. These are usually fixed depending on the specific area or company you are for, but typically range from:

• Plumbing and Electrical Systems: Adding plumbing and electrical systems to the ADU typically costs $10,000–$30,000 and depends on the distance from the main house and the complexity of the work.
• HVAC Installation: Adding heating, ventilation, and air conditioning systems cost $5,000–$15,000. Mini-split systems are an affordable option for smaller units.
• Gas Line Extensions: The costs for gas line installation start at $2,000 and can exceed $10,000 if the ADU is far from the main connection.

Tip: Work with experienced professionals like our ADU builders in Los Angeles to ensure utility installations meet local codes.

Site Conditions and Location

The conditions and location of the site you choose can also be a major part of your cost to build an ADU. Grading and site preparation for sloped lots or uneven terrains can cost $5,000–$15,000. Sites with limited access to equipment and materials may require additional labor and machinery, adding $10,000 or more. Removing old structures like a garage costs $1,000–$10,000, depending on the size and complexity of the removal.

Tip: Conduct a detailed site survey early in the process before building an ADU to identify potential challenges and costs.

Permitting and Regulatory Fees

You need to make sure you get the necessary permits and pay the regulatory fees to make your ADU legally compliant with Los Angeles codes. The costs for permits are as follows:

• Building Permits: These range from $4,000 to $15,000 in Los Angeles, depending on the ADU’s size and type.
• Utility Connection Fees: Fees for connecting water, sewer, and electricity systems range from $1,000 to $5,000.
• Inspection Fees: Ongoing inspections during the construction process can add $500 to $2,000.

Tip: To avoid delays, make sure you research local requirements and factor ADU permit cost early into your budget. 

Labor

Our team can handle every aspect of your ADU construction with expertise, from design to electrical to plumbing to installations and more. Our quality work delivers great results. In Los Angeles, labor costs typically range from $50,000-$100,000 depending on the scope and complexity of the project.

• Basic Labor Costs: These costs range from $50,000 to $100,000 and include framing, drywall installation, and roofing.
• Specialized Labor: If your ADU requires custom finishes, intricate electrical work, or plumbing systems, it can add $10,000–$20,000.
• Contractor Fees: Hiring experienced contractors ensures quality and compliance, with fees ranging from 20–30% of the total project cost.

Tip: Invest in experienced professionals. This guarantees a smooth renovation and outstanding outcomes.

How Can I Reduce the Cost to Build an ADU?

To reduce the cost of building an ADU, you can go for cost-effective materials, optimize the design to make it more cost-efficient, or work with experienced professionals who can provide a more cost-effective layout with minimal wastage or errors. A detailed overview of reducing the cost of building an ADU is as follows:

• Choose cost-effective materials: Make sure you choose the best materials that are cheap but are of high quality for your ADU. Go for basic materials like laminate countertops, vinyl flooring, and prefabricated cabinetry for a more polished look that isn’t expensive. If you are looking to cut down on long-term costs, energy-efficient fixtures are the best choice. 
• Simplify the Design: Reduce unnecessary complications or complexities in your ADU design to save on costs. A simple design is generally less expensive and requires fewer materials to build and maintain. You can stick to a compact layout with fewer walls and open spaces to reduce costs.
• Opt for a Prefabricated ADU: Prefabricated ADUs are built off-site and transported to your property, saving both time and labor costs. These units come in a variety of sizes and designs to fit different budgets.
• DIY: You can handle certain tasks like painting, landscaping, and setting up light fixtures by yourself to save on labor costs. 

Why Should I Hire a Contractor to Build My ADU?

You need to hire a contractor to build your ADU for the following reasons:

• Expertise in ADU Construction: Contractors have the technical knowledge and experience needed to manage ADU construction projects. They understand the difficulties of building codes, material selection, and project management.
• Knowledge of Local Building Codes and Permits: There are many local building codes and permits you need to be compliant with to build an ADU. A contractor can make sure that your ADU gets all the required permits and is compliant with the local building and zoning codes for fast completion. 
• Project Management and Coordination: ADU construction requires coordinating multiple tasks, trades, and schedules. Contractors act as project managers, ensuring smooth execution from start to finish. This means making sure everything happens on time and sourcing materials at competitive rates based on their connections. 
• Access to Skilled Labor: Building a good ADU requires access to labor such as electricians, plumbers, and carpenters. Contractors have excellent relationships with skilled professionals to make sure there is quality workmanship. 
• Cost-Effective Solutions: While hiring a contractor may seem like an added expense, their expertise can save money in the long run. They help avoid costly mistakes and optimize resources. Contractors often have access to wholesale prices for materials that can further reduce costs.

How Do Local Building Codes and Zoning Regulatioms Affect ADU Costs?

Local building codes and Zoning regulations affect ADU costs by determining the design, placement, and compliance requirements of ADUs. These codes and regulations make sure that your ADU is safe and compatible with the neighborhood, but they can increase the costs through fees, design adjustments, or additional permits. 

Here are some local codes and regulations you must be compliant with and the costs associated:

• ADUs in Los Angeles must be built at least 4 feet from the side and rear property lines. This requirement can lead to design modifications to fit within the allowable space, particularly on smaller lots. 
• While parking requirements are waived for ADUs located within half a mile of public transit or converted from existing structures like garages, other locations may require one parking space per unit or bedroom. Adding parking spaces can raise costs by $5,000–$10,000 per space
• Detached ADUs are generally restricted to a height of 16 feet, while attached ADUs may match the main dwelling’s height up to 25 feet if zoning rules allow. Exceeding these limits can require additional permits which can increase the cost by $5,000–$15,000 for two-story units
• As of 2024, Los Angeles no longer mandates owner occupancy for properties with ADUs. However, lots must still meet minimum size requirements, typically starting at 5,000 square feet in many zones. Applying for variances can cost between $1,500 and $5,000 and can potentially delay the construction process.
• ADUs must comply with fire codes, which may include ensuring access to emergency services and installing fire sprinklers. These upgrades can add $10,000–$30,000 to the overall costs while installing fire sprinklers typically ranges from $5,000 to $10,000.

What Are the Long-Term Financial Benefits of Owning an ADU? 

The long-term financial benefits of owning an ADU include rental income, property value increase, and potential tax advantages. An ADU can generate consistent monthly income that can cover the initial investment within a few years. It also boosts property value, making your home more appealing to buyers in the future. You can also get tax deductions related to maintenance, depreciation, or interest on loans used for ADU construction. 

FAQ 

Here are some common questions about ADU construction costs in Los Angeles.

What is the average cost to build an ADU in Los Angeles?

The average ADU cost in Los Angeles is $150,000, with a range from $50,000 to $400,000 depending on size, type, and materials. The factors that influence these costs are site conditions, labor, and utility connections. 

Can I save money by choosing a prefabricated ADU?

Yes, prefabricated ADUs can save money by reducing labor and construction time, with costs ranging from $70,000 to $150,000. However, transportation and site preparation may add to the overall expense.

How long does it take to build an ADU in Los Angeles?

The time to build an ADU in Los Angeles is approximately 6–12 months, depending on size and complexity. However, it can take more time due to permitting, weather, or material availability. 

Can I finance the construction of an ADU?

Yes, you can finance the construction of an ADU through home equity loans, personal loans, or ADU-specific financing programs. These options provide flexibility in managing construction expenses.

Are there grants available for building an ADU in Los Angeles?

Yes, there are grants available for building an ADU in Los Angeles, such as the CalHFA ADU Grant Program, which offers up to $40,000. You can also look into other local programs that may provide funding assistance.

Do ADUs add value to my property?

Yes, ADUs can add value to your property by increasing livable space and rental income potential. They also make homes more attractive to buyers by boosting the resale value of your home. 

How much is a 2-bedroom ADU in California?

A 2-bedroom ADU in California typically costs between $200,000 and $350,000 but depends on size and materials. Custom designs and premium finishes may increase the price even further.

Can you build a 2 story ADU in Los Angeles?

Yes, you can build a 2-story ADU in Los Angeles if it complies with height and zoning regulations. You may need to go for additional structural engineering and permits for such designs.