Did you know that prefab homes can also be used for Accessory Dwelling Units (ADUs) such as backyard secondary units?

Prefab ADUs are built to the State of California Building Code and are legal anywhere in a residential zoning district where there is already a single family home. Building off-site makes this small unit that much more sustainable; its small size already makes ADUs greener, requiring less material and less consumption of utilities. Off-site manufacturing, or production environment, means the materials are protected from the weather and manufacturing efficiencies result in less wasted material.

There are several floor plan layouts and sizes of ADUs meant to accommodate needs and site constraints. The exterior of the units can also be finished to match any type of architecture design.

We invite you to learn more about prefab ADUs at our ADU Showcase. Steve Vallejos, owner of, will install a prefab “micro-unit” (150 square foot) ADU on the parking lot of SCCAOR. You will be able to touch, feel, and ask questions about prefab construction, process, and setting.

The purpose of the event is to demystify prefab construction and facilitate the conversation that these are a commercially-viable solution. With understanding and familiarity of prefab construction, these units should be a well-accepted option that we hope someday soon will only require an over-the-counter approval by local jurisdictions.

Here is a very informational interview with Steve Vallejos, by Kol Peterson, which includes video of a recent setting in Dublin, California and virtual reality tour of a unit.

If you are interested in attending an ADU workshop to understand how to complete a site analysis, permitting process, construction, lending, and leasing, see details and register here. You do NOT need to register for both events as workshop participants will have an opportunity to view the prefab as part of the workshop.

If you would like to be added to our ADU Program interest list to receive future announcements, please sign up here.

This event has been co-sponsored by SCCAOR,, and HTSV.

September 29th
10:00AM - 1:00PM
Santa Clara County Association of REALTORS®