When it comes to designing a custom Accessory Dwelling Unit (ADU), one of the most common questions is, “How much will it cost?” The truth is, there’s no one-size-fits-all answer. Each ADU project is unique, and the cost can vary widely depending on several factors.

Factors Influencing the Cost

The total cost of designing a custom ADU depends on a variety of elements:

• Location: The location of your property can significantly influence the cost, especially due to variations in local regulations, permitting requirements, and other costs.
• Size of the ADU: Larger ADUs naturally require more design and engineering work, which naturally increases the overall cost.
• Complexity of the Project: The complexity of the ADU design is a major factor. For example:
  - Stand-Alone ADU: Designing a detached ADU typically requires more work and resources than an attached ADU or a conversion.
  - Attached ADU: Integrating the new unit with an existing structure can present its own set of challenges, especially in relation to existing framing and foundation.
  - Garage Conversion: While this might seem straightforward, it often requires significant modifications, such as upgrading the structure and utilities.
• Number of Stories: Designing a two-story ADU involves additional considerations, such as structural engineering and compliance with height restrictions.
• Construction Techniques: Innovative or specialized construction techniques can add to the design complexity and cost.
• Terrain Complexity: If your property has challenging terrain, such as slopes or uneven ground, additional engineering and site preparation will be needed, increasing the overall cost.

Cost Range

Given the many variables, it’s helpful to understand the general cost range for custom ADU design services. The market average for a small, straightforward ADU set of plans starts at around $5,000 to $10,000. This typically covers simpler projects like a basic garage conversion or a small single-story, attached ADU.

For larger or more complex projects, such as a stand-alone ADU with multiple stories, unique architectural features, or challenging site conditions, the cost can range from $15,000 to $20,000 or more. These projects require extensive design work, detailed structural plans, and often involve navigating complex permitting processes.

Getting an Accurate Estimate

Because each ADU project is unique, the best way to get an accurate estimate is to start with a consultation. At QuickenPlans, we work closely with you to understand your specific needs, goals, and the unique characteristics of your property. From there, we can provide a detailed quote that reflects the scope and complexity of your project.

Ready to get started? Let's discuss your project - book your free Project Consultation today!

When planning your custom ADU project, understanding the timeframe and deliverables is essential for a smooth and successful process. At QuickenPlans, we strive to balance efficiency with thoroughness, ensuring that your design is completed in a timely manner while meeting all necessary standards and requirements.

Timeframe: A Collaborative Effort

The design process for a custom ADU is a collaborative journey, and the overall timeframe depends as much on your timely feedback and approvals as it does on our team’s efforts. It’s important to remember that this is a two-way road; the more responsive and attentive you are, the quicker we can move forward with each stage.

Here’s what you can generally expect:

• First Concept Iteration: After our initial design kick-off meeting, we aim to deliver the first iteration of the concept design within 10-15 business days. This is the first major milestone where you’ll see your vision start to take shape.
• Overall Completion Time: The entire design process, from initial consultation to the final set of deliverables, can typically be completed within 2-4 months. This timeline is achievable if the client is engaged and provides timely feedback at each stage. Delays in feedback or decision-making can extend this timeframe.

Deliverables: What You’ll Receive

The specific deliverables for your custom ADU project can vary depending on local regulations and requirements. However, there are several key components that are typically included in every project:

• Building Plans: This comprehensive set of plans includes:
  - Site Plan: A detailed layout of the ADU on your property, showing its relationship to existing structures and property boundaries.
  - Floor Plan: A plan view of the ADU’s interior layout, including room dimensions and placement of doors, windows, and fixtures.
  - Elevations: Exterior views of the ADU from all sides, showing design elements like rooflines, windows, and materials.
  - Sections: Cross-sectional views that illustrate the relationship between different levels and spaces within the ADU.
  - Basic MEP Plan: Mechanical, Electrical, and Plumbing plans that outline the MEP fixtures and layout.
  - Roof Plan: A detailed view of the roof, including pitch, materials, and any special features like skylights.
  - Details: Specific construction details such as wall assemblies and other critical components.
• Structural Drawings and Calculations: These documents provide the necessary structural information, including framing, foundation, and other details, ensuring that the ADU meets all safety and building code requirements.
• Energy Efficiency Report: If required by local or state regulations, this report assesses the ADU’s compliance with energy efficiency standards, helping to ensure long-term sustainability and lower operating costs.

Getting Started

With QuickenPlans, you can expect a clear and structured process with regular updates and transparent communication. By working closely together, we can ensure that your custom ADU design is delivered on time and meets all your expectations.

Ready to get started? Let's discuss your project - book your free Project Consultation today!