Custom ADUs Designed & Built in Cupertino Permits, Plans & Construction Included

We bring your ADU vision to life — from zoning and permits to full construction, handled by a local, award-winning team.
  • 3500+ Projects
  • Fully Licensed & Insured
  • Serving All of San Jose

Let's bring your vision to life

From Zoning to Final Walkthrough — We Handle It All Under One Contract

No handoffs. No confusion. Just a streamlined, high-touch ADU delivery process that keeps you in control and on budget.

Project Management & Inspections

Custom Design & Plans

Permit Approval & Compliance

Full-Service Construction

Why Homeowners in Cupertino Choose Urbatect for ADU Projects

  • 1. One-stop Solution with Expert Project Management, Design, Permit & Construction Team, so you avoid delays and communication breakdowns.
  • 2. Custom Design Expertise so you can Maximize Your Lot. Our designers know how to work within tight city lots, setback rules, and zoning codes to help you get the most space and comfort possible.
  • 3. Flexible And Customizable Design-build Solutions with Allowances to Choose Your Own Finishes.
  • 4. Budget Transparency & Cost Control with Fixed Pricing That Protects Against Labor and Material Cost Increases For 16 Months.
  • 5. 25–30% Faster Project Completion Without Compromising Quality.
  • 6. Dedicated Permit Technician & 30% Faster Permit Expediting. Cupertino permitting process is complex. Our dedicated permit technician accelerates approvals and keeps your project moving.
  • 7. Advanced technology & 3D visualization.

Local Expertise

  • Cupertino is known for its innovation, and we bring that same mindset to every ADU we build. Here’s how:
  • 1. Our in-house designers and builders collaborate closely to create accessory dwelling units that blend with your existing home while offering modern functionality and style. From detached backyard cottages to converted garages, we tailor every detail to meet your needs.
  • 2. Navigating city requirements in Cupertino can be complex, but with Urbatect Development on your side, you don’t have to worry. We’ll handle communication with the city, manage timelines, and ensure your project stays on track. Our team prides itself on transparency, craftsmanship, and client satisfaction.

Want the complete guide to Urbatect services?

Real ADU Projects — From Garage Conversions to Detached Units

Albany ADU

  • Size: 800 sq ft
  • No of stories: 2
  • Special features: ADU with ~200 sq ft patio with wood trellis

Phan ADU

  • Size: 750 sq ft
  • No of stories: 1
  • Special features: Designed for flexibility

Castro Valley ADU & office/gym space

  • 798 sq ft ADU + 639 sq ft attached office/gym space
  • No of stories: 1
  • Special features: Attached office/gym space & newly completed driveway

Perlita ADU

  • Size: 1,200 sq ft
  • No of stories: 2
  • Special features: Roof deck

Shaff ADU

  • Size: 685 sq ft
  • No of stories: 2
  • Special features: 2 Car garage

Governor ADU

  • Size: 704 sq ft
  • No of stories: 1
  • Special features: ADA Accessibility

Gallegos ADU

  • Size: 750 sq ft
  • No of stories: 1
  • Special features: Exterior deck & front porch

Camden ADU

  • Size: 222 sq. ft
  • No of stories: 1
  • Special features: Compact design & murphy bed

Whittier ADU

  • Size:700 sq ft
  • No of stories: 1
  • Special features: Custom built design

Arcilla ADU

  • Size: 375sq ft
  • No of stories: 1
  • Special features: Compact design and skylight

Build Ready ADU Plans

Fast track your design and construction process!

Model 13 – 1188SF, 3 Bed and 2 Bath

  • 1188
  • 3
  • 2
Arrow icon

Model 12: 950SF, 2 Bed and 2 Bath

  • 950
  • 2
  • 2
Arrow icon

Model 11 – 900SF, 2 Bed and 2 Bath

  • 900
  • 2
  • 2
Arrow icon

Model 10- 800SF, 2 Bed and 2 bath

  • 800
  • 2
  • 2
Arrow icon

Model 09- 800SF, 2 Bed and 2 bath

  • 800
  • 2
  • 2
Arrow icon

Model 08: 792SF, 2 Bed and 2 bath

  • 792
  • 2
  • 2
Arrow icon

Model 07: 700SF, 2 Bed and 1 Bath

  • 700
  • 2
  • 1
Arrow icon

Model 06: 650SF, 2 Beds and 1.5 Bath

  • 650
  • 2
  • 1.5
Arrow icon

Model 05 – 634SF, 1 Bed and 1 Bath

  • 634
  • 1
  • 1
Arrow icon

Model 04: 600SF, 1 Bed and 1 Bath

  • 600
  • 1
  • 1
Arrow icon

Model 03 – 500SF, 1 Bed and 1 Bath

  • 500
  • 1
  • 1
Arrow icon

Model 02: 500SF, 1 Bed and 1 Bath

  • 500
  • 1
  • 1
Arrow icon

Model 01: 420SF, Studio, 1 Bath

  • 420
  • 1
  • 1
Arrow icon

Real Results in Cupertino

Permitting is often one of the biggest hurdles in ADU projects, but we’re here to simplify it. Here’s how:

  1. Our experts are well-versed in navigating the ADU permit process in Cupertino, including compliance with the latest city regulations. We work directly with local officials to make sure your plans are approved quickly and correctly, saving you time and avoiding costly delays.

  2. What sets Urbatect Development apart is our integrated approach. With in-house design and construction teams, clear communication, and a commitment to quality, we deliver a smooth experience from concept to completion. We also take the time to understand your goals and budget to make sure your new ADU adds lasting value to your property.

If you’re ready to build in Cupertino, trust the local experts in ADU design, permitting, and construction. Contact Urbatect Development today to work with a dedicated Cupertino ADU contractor who can bring your vision to life efficiently, creatively, and with full compliance.

Build Smarter. Build Faster. Build with Urbatect.

Thousands of homeowners across California trust Urbatect to handle everything under one roof — and now, we’re helping San Jose homeowners unlock the full potential of their properties with ADUs that are as beautiful as they are functional.


A Detached Accessory Dwelling Unit (ADU) is a standalone structure, built independently from your main house and any other buildings on your lot. This offers maximum privacy and flexibility, perfect for rental income, guest accommodations, a home office, or multi-generational living.

While an Attached Accessory Dwelling Unit (ADU) integrates with your existing home by sharing a wall, it’s important to understand its independent nature. Unlike a simple extension, an attached ADU operates as a self-contained living space with its own private entrance. This ensures clear separation and privacy between the main house and the ADU.

Your garage holds untapped potential! Converting it into a self-contained living space is a smart way to add value and flexibility to your property. Often, garage conversions fall under the category of an Accessory Dwelling Unit (ADU). When this conversion stays within the existing footprint of your single-family home, it might be classified as a Junior ADU (JADU). JADUs often have specific size limitations set by local ordinances and can be a cost-effective way to create an independent unit for family, guests, or even rental income. We can help you navigate the possibilities and determine if a JADU conversion is the right fit for your needs.

Have an underused basement or an existing in-law unit in your home? These are prime candidates for Accessory Dwelling Unit (ADU) conversions! Let us help you reimagine these spaces into comfortable, self-contained living areas. Whether you need extra income, guest accommodations, or a solution for multi-generational living, we’ll handle the design and build process to create a valuable ADU that meets local requirements.

1,000+ Happy Customers.
Real Stories, Real Results.

How We Build ADUs — The Urbatect Way

Site Discovery & Assessment
1
Feasibility & Conceptual Designs
2
Detailed Design Development
3
Permitting
4
Build & Execute
5
Walkthrough & Completion
6

Our Awards and Recognition

award1
award4
award
award6
award7
houzz-awards
award5
award2

What Sets Us Apart

years of experience
0 +
projects
0 +
California Cities Served
0 +

Licensed

& Insured

FAQs

The full process of designing, permitting, and constructing a new accessory dwelling unit (ADU) typically takes 10 to 16 months, depending on the complexity of your project, city processing times, and coordination with you throughout each phase. Here’s a general breakdown:

  • Design & Permitting: 2 to 4 months
    This typically includes concept plans, schematic and design development, and Title 24 compliance. Multiple design meetings and revisions are typically included during this phase to ensure your vision is fully incorporated in the design.
  • Permitting: 3 to 4 months
    Once plans are submitted, the city reviews them in plan check cycles. Timelines vary by jurisdiction and can depend on the city’s backlog as well, and may include revisions to the plans based on city feedback before final permit issuance.
  • Construction: 5 to 8 months
    Construction duration typically depends on unit size, complexity, site conditions, and city inspection timelines. This includes everything from site prep and framing to MEP installation, finishes, and the final Certificate of Occupancy.
  • We aim to complete ADU projects in 10 to 12 months whenever feasible, but always advise planning for up to 16 months to account for external delays.

In California, the maximum size of your ADU depends on whether it’s attached or detached, your lot size, and your local city or county’s zoning regulations.

  • Detached ADUs are allowed up to 1,200 sq. ft. in many areas, but state law requires all jurisdictions to permit at least 800 sq. ft., regardless of lot coverage, setbacks, or floor area ratio limits.
  • Attached ADUs can typically be up to 50% of the size of your primary home, but must be allowed at least 800 sq. ft., even if 50% would be less.

Local ordinances may allow more—but cannot restrict you below these state minimums. Every property is unique and may have specific conditions—such as lot configuration, easements, setbacks, or local overlays—that impact the maximum ADU size. We offer a free property-specific assessment as part of our initial process—even before a contract is signed—to help define your scope and guide you clearly. Contact us at (559) 412-8841 or info@urbatect.com, and we’ll assess your site to confirm the maximum ADU size allowed under your city’s rules.

Adding an ADU is not just a smart way to maximize your property—it’s a long-term investment that boosts value, generates income, and offers greater flexibility for your evolving needs. Here’s why building an ADU makes strong financial sense:

  • Boosts overall property value
  • Builds equity immediately by adding livable square footage and a permitted unit to your asset
  • Strong return on investment (ROI) in both resale and rental markets
  • Generates passive rental income – short- or long-term
  • Offers flexibility for future use (guest house, home office, aging parents, etc.)
  • Provides private space for family or visitors
  • More cost-effective than buying a new property or undertaking major home additions
  • Adds diversification to your real estate investment portfolio
  • Supports sustainable living with compact, energy-efficient design options

No—owner-occupancy requirements have been eliminated for ADUs across California, with the exception of Junior ADUs (JADUs). This means you’re not required to live on the property to rent out your ADU. However, JADUs still require the property owner to reside on-site, either in the main home or the JADU.

Not necessarily. While pre-approved plans can be faster to permit, they still need to meet your specific site conditions and local city regulations, which can result in costly changes or delays if they don’t align perfectly. At Urbatect, we specialize in custom solutions that are designed to minimize revisions, avoid surprises, and ensure smoother permitting—helping you save time and money in the long run.

Ready to Build an ADU in Cupertino?

Start with a free consultation. We’ll provide:

  • A project assessment, zoning & feasibility check, planning and layout of an ADU
  • A personalized cost estimate & free site visit
  • Guidance on timlines, permits and design possibilities