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Plan. Design. Build Your Space.

From concept to permitting, we handle every step of your ADU journey so you can focus on what matters most.

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Discover the Right ADU Type for Your Needs

Detached ADU

  • Build a separate unit with flexible design and size.
  • Offers maximum privacy and flexibility.
  • Great for rentals, guest homes, or extra living space.

Attached ADU

  • Convert unused rooms into functional living space.
  • Keep your property’s footprint intact and efficient.
  • Ideal for cost-conscious homeowners maximizing space.

Conversion ADU

  • Turn garages, sheds, or outbuildings into ADUs.
  • Add living space quickly and affordably.
  • Utilize existing structures for maximum efficiency.

Discover Your ADU Options Today!

Your ADU Journey Simplified

Everything you need to ADU

Assess

We evaluate your property’s ADU potential, analyzing zoning laws, structural factors, and your goals to create a tailored plan for success.

Design

We create a comprehensive set of drawings, including civil plans, architectural plans, structural plans, and other key elements, ensuring they meet your vision and comply with California ADU regulations.

Permit

We streamline the permit preparation process by collaborating with our team of vendors, engineers, and architects, ensuring all documentation is accurate and working with local departments to secure timely approvals.

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Transparent Pricing, No Surprises

Pre-ADU Designs

ADU Plans

Starting at

$6,750*

  • Pre-Designed Floor Plan
  • Custom Site Plan
  • Building Elevations & Sections
  • Plumbing & Electrical Plans
  • Foundation Plans
  • Framing & Roofing Plans
  • Structural Details
  • Construction Notes & Details
  • Title 24 Energy Calculations
  • Permit Processing
Schedule a Consultation

Most Popular

Custom

ADU Plans

Starting at

$8,750*

  • Custom Floor Plan
  • Custom Site Plan
  • Building Elevations & Sections
  • Plumbing & Electrical Plans
  • Foundation Plans
  • Framing & Roofing Plans
  • Structural Details
  • Construction Notes & Details
  • Title 24 Energy Calculations
  • Permit Processing
Schedule a Consultation
*Pricing starts at $6,750 and varies based on ADU size, design complexity, and jurisdictional requirements.
 
Additional services from third-party consultants—including Structural Engineers, Surveyors, Civil Engineers, and Soils Engineers—may be required based on your property’s unique conditions. These services are not included in the flat-fee pricing and may be necessary to meet local regulations.
 
Final pricing is determined after an initial consultation. Schedule a free consultation to confirm pricing for your specific project.

Simplify Your ADU Project—Free Handbook!

Your go-to resource for navigating ADU types, permits, codes, and approvals.

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FAQ

Accessory Dwelling Units (ADUs) are secondary housing units located on the same property as a primary residence. They can be standalone structures, additions to the existing home, or conversions of existing spaces like garages or basements. ADUs are a flexible solution for creating additional living space, whether for rental income, multigenerational living, or personal use.
ADUs generally come in three primary forms:
 
  • Attached ADUs: Built as an extension of the primary home, sharing a wall or structure. Example: Adding a new bedroom with a separate entrance to the side of your existing house.
  • Detached ADUs: Completely separate units built on the property, offering privacy and flexibility in size and design. Example: Constructing a small studio or one-bedroom unit in your backyard.
  • Conversion ADUs: Transform existing structures such as garages, basements, or sheds into fully functional living spaces. Example: Converting your detached garage into a rental unit with a kitchenette and bathroom.
Each type of ADU has unique benefits depending on your property’s layout and your specific goals.

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Junior Accessory Dwelling Units (JADUs) are small housing units, up to 500 square feet, built within the existing footprint of a single-family home. They often involve converting spaces like spare bedrooms, garages, or attics into functional living areas. Unlike traditional ADUs, JADUs share key facilities—such as bathrooms, utility services, and mechanical systems—with the primary residence, making them an affordable and efficient housing solution.
 
JADUs are subject to specific regulations, requiring them to be part of the main residence rather than a detached structure. They do not expand the property’s planned occupancy, minimizing the impact on infrastructure and utilities. As a result, JADUs are one of the most popular ADU options for homeowners seeking to maximize their property’s potential without significant construction or expense.

The ADU process includes several key steps:
 
  1. Property Assessment: We evaluate your property for zoning compliance, setbacks, and ADU feasibility.
  2. Design: Our team creates detailed drawings, including site plans and elevations, that align with your vision and local regulations.
  3. Permit Preparation: We handle the submission and coordination of all necessary documents with local authorities.
  4. Approval and Next Steps: Once permits are approved, you’ll be ready to proceed with construction.
Our streamlined approach ensures transparency and efficiency at every step.

View Our Process
MADU Concept specializes in the entitlement and permitting process for ADUs. Our services include:
 
  • Feasibility studies to assess your property’s potential.
  • Custom ADU design development, including comprehensive drawings.
  • Navigating local regulations and submitting all required permit applications.
  • Coordinating with engineers and other professionals to ensure a seamless approval process.
We focus on guiding homeowners through the complex permitting process, ensuring their ADU project is ready for construction.

The cost of building an ADU varies based on its type, size, design, and materials used. For example, detached ADUs tend to cost more than garage conversions due to additional construction requirements. On average, ADU projects range from $100,000 to $400,000, but we can provide an estimate tailored to your goals and budget.

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The timeline for obtaining ADU permits depends on your location and the complexity of your project. In general, the process can take anywhere from 3 to 6 months. MADU Concept specializes in navigating local regulations and works to expedite the approval process whenever possible.

Yes, ADUs can be rented out as long as they comply with local rental regulations. They are a great option for generating rental income, housing tenants, or creating short-term rental opportunities like Airbnb. Some jurisdictions have specific restrictions on renting ADUs, so it’s important to check local rules.

Most residential properties in California qualify for ADUs, but eligibility depends on factors such as zoning laws, property size, and setbacks. During our property assessment, we’ll review all requirements and determine if your property is a good fit for an ADU.

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ADUs are subject to local zoning laws, including setbacks, height limits, and parking requirements. While California has statewide laws supporting ADUs, individual cities may have additional rules. We’ll help you navigate these regulations to determine what’s possible on your property.

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In many cases, ADUs do not require additional parking, especially if your property is near public transit or located in an urban area. Local rules vary, and we’ll review your property to determine whether parking requirements apply.

Yes, ADUs can be customized to suit your specific needs, style, and budget. Whether you’re looking for a modern studio, a two-bedroom unit, or a design that matches your existing home, we’ll work with you to create the perfect plan.

Explore ADU Types

Yes, there are several ways to finance an ADU, including home equity loans, construction loans, or cash-out refinancing. We can provide guidance on financing options and connect you with lenders experienced in ADU projects.

In California, ADU sizes are typically limited to 1,200 square feet, but local regulations may impose additional restrictions based on lot size, zoning, and other factors. We’ll assess your property and design your ADU to comply with these requirements while maximizing your available space.

A Title 24 report is a document that demonstrates compliance with California’s Building Energy Efficiency Standards, as outlined in Title 24 of the California Code of Regulations. For Accessory Dwelling Units (ADUs), this report assesses the energy efficiency of the proposed design, including aspects like insulation, windows, and HVAC systems. Ensuring your ADU meets Title 24 requirements is essential for obtaining building permits and promoting energy efficiency.

Permit fees for ADUs in California vary based on factors such as location, size, and complexity of the project. Generally, smaller ADUs may incur permit fees ranging from $2,000 to $4,000, while larger units could see fees between $5,000 and $10,000 or more. It’s important to note that these figures can differ significantly by jurisdiction, and additional fees like impact fees may apply. Consulting with local authorities or a professional service can provide a more accurate estimate tailored to your specific project

A single-family ADU is an accessory dwelling unit added to a property with one primary residence. This can include attached units, detached units, or conversions of existing spaces like garages.
 
In contrast, a multi-family ADU is constructed on a property that already contains multiple residential units, such as duplexes or apartment buildings. Regulations for multi-family properties may allow multiple ADUs, depending on the property size and available space. For example, California laws often permit up to two detached ADUs or conversions of non-habitable spaces (e.g., storage rooms, basements) into ADUs within multi-family buildings.
 
Both types serve distinct purposes, with single-family ADUs typically benefiting individual homeowners and multi-family ADUs appealing to property investors or landlords looking to increase rental income.
Homeowners build ADUs for various reasons, including:
 
  • Rental Income – Generate passive income with long- or short-term rentals.
  • Housing for Family – Provide a private space for aging parents or adult children.
  • Future Downsizing – Move into the ADU later and rent out the main house.
  • Multigenerational Living – Accommodate extended family while maintaining privacy.
  • Home Office or Studio – Create a dedicated workspace or creative area.
  • Increase Property Value – Boost resale value and investment potential.

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