Build a Modern Backyard Cottage.

Open the Door to Endless Possibilities.

Turn your property into a sanctuary, an income stream, or a multigenerational home for the ones you love—in Northern California and beyond.

Catalog: ADU Floorplans

Who are we?

Guided by Experience.

At Perpetual Homes, we design and build sustainable, backyard homes and ADUs (Accessory Dwelling Units) for homeowners across Northern California. Our prefab ADUs make it easier to expand your living space, care for loved ones, support multi-generational living, or create rental income.


With more than 40 years of experience, we manage every step of the process—from design and permitting to construction and completion.


Founded by veteran developer Katherine Noe Anderson, Perpetual Homes is rooted in connection, community, and integrity. Our homes are designed to reflect how people really live, providing comfort, flexibility, and a true sense of belonging.

Get Started

Move into a thoughtfully designed backyard ADU home at an affordable price.

Whether you are early in the planning process or evaluating your next steps, our Perpetual Homes ADU team can help you understand potential options for your property. A free virtual site assessment offers a high-level look at your property and an overview of how a prefab ADU may fit your space, goals, and local requirements.

View the Catalog

Explore Your Designs

Choose from a wide selection of highly customizable prefab ADU designs created for residential properties in California, ranging from compact studios to larger 3-bedroom layouts. Our catalog allows homeowners to review floor plans, compare model types, and see how our designs maximize space, style, and livability for modern life.


Select designs are on display and available to view in person by appointment at our Northern California locations, including Danville, Concord, Sonoma, and Santa Rosa.

One-Bedroom ADUs

Modern white tiny home with black trim, outdoor patio with wicker furniture.
One Bedroom Designs

Two-Bedroom ADUs 

Two Bedroom Designs

Three-Bedroom ADUs

Three Bedroom Designs

Three-and Four-Bedroom Single Family Homes and Duplexes

Browse Full Catalog

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10-step process

The Journey of Creating Your New ADU Home, Made Simple

Our proven 10-step process takes you from your vision to reality, guided by the Perpetual Homes ADU team supporting you every step of the way. 


Highlighted Steps: 

Step 1: Complimentary Virtual Assessment

Start Smart With Lot & Model Evaluation

Step 2: Feasibility Analysis

Confirm What’s Possible On Your Site

Step 3: Site Visit

Walk the Site, Answer Every Question

See All 10 Steps

What Sets Us Apart

Perpetual Homes

Why Thousands of California Homeowners Trust Us to Build Their Future

  • One of California’s largest, most experienced, privately owned ADU companies
  • Our prefab partner named America’s Most Trusted Manufactured Home Builder five years running (2019–2024)
  • 40+ years in real estate development with deep ties to local Northern California agents and permitting offices
  • Woman- and family-owned ADU company, rooted in integrity and connection
  • Accredited with the Better Business Bureau (A+ Rating)

What You Get

  • No markup on site work → save 20–30%
  • Energy Star insulation → reduce PG&E bills by up to 30%
  • High finish level included (approx. $15K in upgrades built into the base price)
  • Transparent ADU pricing with financing resources available
  • 7-year warranty for peace of mind
  • Dedicated ADU project coordination from start to move-in
  • Full permitting services and due diligence analysis
  • Customize your ADU to fit your lifestyle and property

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Our Story 

The Legacy Behind Perpetual Homes

At Perpetual Homes, we don’t just build ADUs—we build lasting legacies.


Founder Katherine Noe Anderson grew up in a family of builders, inspired by her great-grandfather’s churches and her father’s homes. From an early age, she believed a house should be more than shelter—it should be a sanctuary.


After more than 40 years in real estate and development, Katherine launched Perpetual Homes to serve California’s “missing middle”: families seeking beautiful, affordable spaces that keep generations close.


Today, the tradition continues with her sons, Justin (civil engineer) and William (project manager)—a family building homes where people truly belong. 

Meet Our Team

IN THE NEWS

Perpetual Homes ADU has been featured by:

  • Business Insider
  • Diablo Magazine
  • Dwell
  • East Bay Times
  • The New York Times
  • San Francisco Chronicle

5-STAR REVIEWS

What our clients are saying.

"Perpetual Homes didn’t just build an ADU—they helped build our future. The process was smooth, transparent, and personal.”

—Joyce and Mike B., San Jose, CA