San Jose Breaks Ground on First Type 1A Fire-Resistant ADU

Builtech Construction broke ground on an 850-square-foot ADU in San Jose that set a new benchmark for residential fire safety across California. This project became the first in the city built to Type 1A standards, the highest fire-resistance classification available under state building codes, through advanced Insulated Concrete Form technology.

The ICF system stacked lightweight foam blocks like oversized building blocks before crews inserted rebar and poured concrete to create a solid non-combustible core. The resulting walls delivered exceptional protection against fire spread while adding seismic strength, soundproofing, pest resistance, and energy efficiency far beyond traditional wood-frame construction.

The build came together at roughly $350,000, matching costs for conventional methods in the area. Additional features such as fire-resistant windows, a metal roof structure, and fire-rated vents completed the resilient design ready for today’s denser neighborhoods.

ADUs are a key avenue for growing the San Jose housing supply and lowering costs. Any technological advances here will have an amplified impact on our city.

San Jose Pioneers Affordable Housing with First ADU Condo Sale

San Jose has marked a significant milestone by becoming the first city in California to approve the sale of an accessory dwelling unit as a condominium. This achievement opens new pathways for homeownership and addresses the pressing need for more housing options in the region. The inaugural unit at 410 Josefa Street, near Diridon Station, stands as a model for future developments, already occupied by tenants and ready for market.

Enabled by Assembly Bill 1033, which took effect in 2024, this initiative allows ADUs to be sold independently from the main residence. Cupertino-based AlphaX RE Capital led the project, with the city's Department of Public Works completing the necessary parcel map review in just 60 days. Such efficiency demonstrates San Jose's commitment to streamlining processes that support innovative housing solutions.

Since 2022, the city has approved 1,500 ADUs, accounting for over 20 percent of its new housing production. These units provide an accessible entry into ownership, particularly for those seeking affordable alternatives in a competitive market. AlphaX RE Capital plans to develop more than 80 additional spaces, expanding opportunities across neighborhoods.

To assist residents and developers, San Jose offers resources like the ADU Condominium Checklist and the longstanding ADU Universal Checklist, which simplify permitting and conversion steps. The addition of two ADU Ally positions in the Building Division further eases navigation through the process, ensuring more people can participate in this growing trend.

This development highlights San Jose's proactive approach to housing challenges, fostering a community where innovation meets practicality. As the city continues to lead in such efforts, residents gain fresh ways to build equity and stability right in their backyards.

Source: SVBJ

Single family homes proposed for Piedmont area of San Jose

Robson Homes has submitted a proposal for a 25 unit project at the Olivera Egg Ranch (3315 Sierra Road). Each single family home will range from 1,976 SQFT to 2,771 SQFT and several of the homes will include attached ADUs up to 444 SQFT.

I'm a huge fan of Robson Homes. Their build quality is exceptional and they feature smart and efficient floorplans with great integration of ADUs for multi-family living (or renting out a portion of your home).

Before the urbanists get up in arms over a new single family development in San Jose, this location is pretty deep in suburbia with no hope of mass transit in the future. The Berryessa BART station is an 8 minute drive away.

If approved, construction would take around 16 months.

Source: SF YIMBY

Wishlist Wednesday: 3d printed homes in San Jose

We live in the epicenter of technological disruption and innovation, yet housing has changed very little in decades. Now we're starting to see some interesting ideas being tested in this space. A community called Wolf range in Georgetown, Texas (north of Austin) is being built by Lennar using a giant 3D printer. The machine is 45 feet wide and weighs almost 5 tons. 

The "ink" is a mixture of concrete powder, water, and sand. This makes the homes very resilient to extreme weather and increases waterproofing and energy efficiency dramatically. 

I have spent a lot of time in homes made out of concrete and stone throughout my life and can vouch that the level of insulation is excellent. Sometimes it can be a 20 degree difference between outdoor and indoor temperatures with very little heating or air conditioning needed. I can also attest that the one downside is WiFi signals will struggle to get through the walls as mentioned in the source article. A multi-router mesh network is ideal.

The 100-home project started in 2022 and should be done by the end of the summer. Each of the homes range from $450k to $600k and feature three to four bedrooms.

What makes me excited about this technology, is that with economies of scale the cost of homebuilding could decrease while delivering a better overall product. There is limited space for single family homes in San Jose, but this can easily be used for ADUs or even townhomes with a little effort. The cost of construction is one of the key variables keeping housing costs high, so any downward pressure on that will benefit homebuyers and help increase supple in Silicon Valley.

Source: Engadget

San Jose becomes the first city in California to allow homeowners to sell ADUs

In order to solve for housing shortages, skyrocketing rents, and dizzying mortgages we have to think outside the box. San Jose just took a significant step to increase the housing supply and provide more low cost options.

San Jose already is one of the most accommodating cities when it comes to building an ADU (accessory dwelling unit) on your property. On a typical single-family lot, a homeowner can build a detached ADU up to 1,000 SQFT or an attached ADU up to 800 SQFT. Now, instead of just renting out the ADU, you can actually sell it as a condominium.

This will encourage more people to built them in their backyards and open up low-cost homeownership for more people, especially those early on in their careers. Some ADUs are quite nice, like the 500 SQFT one mentioned in the source link below.

San Jose is already receiving four times as many requests to build ADUs as San Francisco. In fact, even homebuilders like Robson Homes are including them as options for new housing projects in San Jose. 

Source: ABC7 News