Building an ADU

The step-by-step guide to planning, designing & building accessory dwelling units.

   Watch Promo

"This is the best possible starting place when beginning to explore the idea of building an ADU. The class covers almost every possible aspect of ADU's from design, construction and operations and has been a great jumping off point to build my own ADU. Highly recommended."

- Sam Lawhead, Realtor

"Even if you already think you know where to start, THIS is where you should start!"

- James Nielsen, Homeowner

"Even coming from someone who works in the industry--I work at a design firm that specializes in building ADUs--Kol's class still provided me a wealth of new information."

- Sam Sudy, Architect

Your Instructor


Kol Peterson
Kol Peterson

Hi, I’m Kol Peterson. I’m obsessed with ADUs and helping to get more of them built. I'm thrilled to offer you this online course to help you understand all the steps to developing and building an ADU.

I live in Portland, Oregon, which is the accessory dwelling unit capital of the United States (615 ADU permits issued in 2016). Since building my own ADU, I’ve focused my energies on ADU advocacy and education. I'm the organizer of the only ADU tour in the country, and I'm the author of Backdoor Revolution: The Definitive Guide to ADU Development (scheduled to publish in late 2017). In 2013, my wife and I also opened the Caravan-The Tiny House Hotel, the first tiny house hotel in the world.

I know from personal experience how much building an ADU can improve one's life in terms of financial freedom and lifestyle flexibility. This is likely why you are interested in building one, and this course is going to help you get there.


You’re thinking of building an ADU. But you’ve got questions. You’ve got concerns. And you’ve got some anxiety about the whole thing.

This is exactly how I felt when I built my first ADU. I just wanted to have someone who had been through the process walk me through it step by step. Well, that’s why I built this course and the Building an ADU website.

Here’s what you’ll get:

  • 20 classes covering every facet of ADU development from ADU costs to financing, design to permitting, and construction to rental management approaches
  • 40+ quick tips from out in the field covering tips on ADU specific building information
  • 6 Interviews with ADU owners who have recently gone through (or are going through) the ADU development process themselves
  • 5 walking tours of ADUs
  • Access to live Q&As with me, Kol Peterson. If you sign up before July 30th, you'll have the opportunity to attend live Q&A sessions, where I’m available to answer any ADU development questions you have.
  • Tips and advice on where to access additional resources to help you through the ADU development process

See the full curriculum below...


Class Curriculum


  Introduction
Available in days
days after you enroll
  Topic #1: Why ADUs
Available in days
days after you enroll
  Topic #3: Cost management
Available in days
days after you enroll
  Topic #4: Financing
Available in days
days after you enroll
  Topic #5: Designer/Builder relationships
Available in days
days after you enroll
  Topic #6: Rental income models
Available in days
days after you enroll
  Topic #7: Building science
Available in days
days after you enroll
  Topic #8: Green building
Available in days
days after you enroll
  Topic #9: The design process
Available in days
days after you enroll
  Topic #10: ADU design principles
Available in days
days after you enroll
  Topic #11: Utility connections
Available in days
days after you enroll
  Topic #12: The construction process
Available in days
days after you enroll
  Quick tips
Available in days
days after you enroll

Frequently Asked Questions


When does the course start and finish?
The course starts now and never ends! It is a completely self-paced online course - you decide when you start and when you finish.
How long do I have access to the course?
How does lifetime access sound? After enrolling, you have unlimited access to this course for as long as you like - across any and all devices you own.
What if I am unhappy with the course?
We would never want you to be unhappy! If you are unsatisfied with your purchase, contact us in the first 30 days and we will give you a full refund.

Get started now!