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ADU Design Services in Santa Clara – Permit, Cost, and Timeline [2025]

  • Writer: infoclahus
    infoclahus
  • Jun 19
  • 2 min read

As housing demand continues to rise in California, Accessory Dwelling Units (ADUs) have become a smart and popular solution—especially in places like Santa Clara, where space and zoning laws now favor creative expansion.

At NCA Designs, we specialize in full-service ADU design, from concept to permits. Whether you're planning to build a rental unit, a guest house, or a home office in your backyard, here’s what you need to know about the process, timeline, and cost of building an ADU in Santa Clara.


  1. What Is an ADU?


An Accessory Dwelling Unit (ADU) is a small, independent residential unit located on the same lot as a primary home. It can be detached, attached, converted from a garage, or even built above a garage. California law now makes it easier than ever to build one.


  1. Why Build an ADU in Santa Clara?


  • High demand for rental units

  • Adds value to your property

  • Flexible use: rental income, guest space, office, aging-in-place

  • Lenient city policies supporting ADU development



We offer a turnkey ADU service:

  1. On-site Consultation: Understand your space, goals, and budget.

  2. Custom ADU Design: Tailored floor plans that meet your lifestyle and maximize space.

  3. 3D Visualization: Preview your ADU with photorealistic renders and virtual walkthroughs.

  4. Permit & Code Compliance: We handle the Santa Clara permit process, including:

    • Title 24 energy compliance

    • Site setbacks

    • Height limits

    • Fire safety and egress requirements

  5. Construction SupportWe partner with trusted builders or coordinate with your team to bring your ADU to life.


  1. Estimated Cost of ADU Design & Construction in Santa Clara

Type of ADU

Size Range (sqft)

Estimated Total Cost (Design + Build)

Garage Conversion

350 – 500 sqft

$120,000 – $160,000

Attached ADU

400 – 800 sqft

$150,000 – $200,000

Detached New-Build ADU

500 – 1200 sqft

$180,000 – $280,000

Note: Prices vary based on finishes, foundation work, and permit fees.



  1. Permit Timeline for ADU Design in Santa Clara:


  • Initial design + revisions: 2–3 weeks

  • Permit preparation & submission: 1–2 weeks

  • City review + approval: 6–10 weeks

  • Build timeline: 3–5 months after permit approval

We track the permit status for you and handle all city communication.


  1. Documents Required for Permit Submission:


  • Site Plan

  • Floor Plan + Elevations

  • Title 24 Energy Report

  • Structural Calculations

  • Sewer & Utility Connection Plans (if needed)

We prepare all documents in-house or coordinate with licensed engineers if required.


  1. Why Choose NCA Designs for ADU Design in Santa Clara?


  • Local knowledge of Santa Clara ADU codes

  • Fast turnaround with city coordination

  • Experienced in maximizing space + light

  • Full package: design, rendering, permit, and builder support


Ready to Build Your ADU?

Don’t wait—property values and rental income potential are rising fast. Let our team help you design and build the perfect ADU for your needs.


Schedule Your Free ADU Consultation Now, Contact: info@ncadesigns.com

 
 
 

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