Two Detached ADUs in Newark (AB 956, 2027)
Plan Two ADUs in Newark: Free Site Assessment
Newark ADU rules today (2026)
From January 1, 2027, state law (AB 956) requires cities, including Newark, to approve up to two detached ADUs on a lot with a single-family home. Newark adopted a new ADU ordinance in early 2026 (Ordinance 563), so its rules are recent. Here is how they line up with the new law.
- Units allowed now: one ADU (detached or attached) plus one JADU (NMC §17.26.040, Ordinance 563, 2026). Under the state-exempt path, one conversion ADU, one JADU and one new detached ADU of 800 sq ft or less.
- Sizes: detached up to 1,200 sq ft; attached up to 1,000 sq ft; conversions have no limit; JADU up to 500 sq ft. Garages and covered porches do not count as floor area.
- Height: 16 ft for a detached ADU; 18 ft near transit or on lots with a multistory multifamily building, plus 2 ft for roof pitch in transit areas. Attached ADUs follow the district limit, up to two stories.
- Setbacks: 4 ft side, rear and corner street-side. ADUs over 800 sq ft must meet the district front setback and landscaping rules.
- Parking: none for an ADU or JADU, and no replacement parking.
- Process: ministerial, no hearing, with a decision within 60 days of a complete application. Most ADUs need only a building permit.
- Pre-approved plans: Ordinance 563 requires the city to post approved plans and designer contacts.
What changes on January 1, 2027
AB 956 raises the number of detached ADUs Newark must approve on a single-family lot from one to two, both new construction. Each may be limited to 800 sq ft of living space, local height limits can still apply, and side and rear setbacks can be no more than 4 ft. Where two detached ADUs are built, a JADU on the same lot does not have to be approved. The law also includes protections for owners in homeowners associations.
Newark already allows a detached ADU of 800 sq ft or less alongside a conversion ADU and a JADU. AB 956 adds a second new detached unit. Newark’s 1,200 sq ft detached limit is above the 800 sq ft each unit may be held to in a two-unit project. Units of 800 sq ft or less also have more front-setback flexibility under the current code. Newark will need to update its ordinance, and we will confirm the current rules as it does.
Recent Axiom work
Professional photos from a recent Axiom Renovation full remodel and addition in Los Gatos.
Planning two detached ADUs on a Newark lot
- Design standards: detached ADUs match the house’s wall and roof colors, have no entrance or outside stairs on the street-facing front wall, use downward lighting and sit on a permanent foundation.
- Privacy: second-story windows within 5 ft of a neighbor’s line must be obscured or have high sills, and second-story balconies are not allowed within 10 ft of the line. Second-story additions over 16 ft need design review.
- Utilities: sewer is Union Sanitary District, water is Alameda County Water District and power is PG&E. Two units need a sewer and water layout that works for both.
- Electrical: two ADUs usually need a load calculation and often a service upgrade.
- Sprinklers: an ADU needs sprinklers only if the main house requires them.
- Use and sale: rentals must be longer than 30 days, and separate sale is allowed only under Gov. Code §§66340–66341.
Building ADUs in Newark with Axiom
See our Newark ADU builder page and our Newark service area, read the AB 956 overview, or compare neighboring Fremont and Union City.
Process
Our ADU Process
Step 1
Initial Consultation
We begin with a thorough initial consultation to understand your needs, assess your space, and discuss your vision, budget, and timeline.
Step 2
Planning and Design
At Axiom Renovation, we understand that the planning and design phase of an ADU project is crucial to its success. Our dedicated project managers will work closely with you to understand your goals, design ideas and budget for the project.
Step 3
Material Selection
We guide you through selecting high-quality materials that fit your design and budget, ensuring durability and aesthetic appeal.
Step 4
Demolition and Preparation
Careful demolition and preparation work are performed to ready the space for construction, minimizing disruptions and ensuring a clean work environment.
Step 5
Construction and Installation
Our skilled craftsmen handle the construction phase, including obtaining permits, scheduling appointments, and the actual construction and installation with precision, building the new space according to the approved design.
Step 6
Electrical and Plumbing Work
Licensed professionals conduct all electrical and plumbing work, ensuring everything is up to code and seamlessly integrated into the new ADU.
Step 7
Painting and Finishing
We pay close attention to detail during the painting and finishing stage, ensuring all surfaces are properly prepared and beautifully finished.
Step 8
Fixture and Appliance Installation
We expertly install all fixtures and appliances, ensuring they function correctly and fit perfectly with the overall design.
Step 9
Final Touches and Clean-Up
Final touches are added, and a thorough clean-up is performed, leaving your new space pristine and ready for use.
Step 10
Final Walkthrough and Client Satisfaction
We conduct a final walkthrough with you to ensure every detail meets your expectations and address any remaining concerns, ensuring your complete satisfaction.
Newark Two-ADU FAQ
Can I build two detached ADUs in Newark?
From January 1, 2027, AB 956 requires Newark to approve up to two detached, new-construction ADUs on a single-family lot that meets objective standards. Today Newark allows one ADU plus one JADU, or a conversion ADU, a JADU and one detached ADU of 800 sq ft or less.
How large can each ADU be in Newark?
Today a detached ADU can be up to 1,200 sq ft and an attached ADU up to 1,000 sq ft. Under AB 956, the city may limit each of two detached ADUs to 800 sq ft of living space.
How tall can a detached ADU be in Newark?
16 ft in most cases, or 18 ft near transit or on lots with a multistory multifamily building, with 2 more ft for roof pitch in transit areas.
Does a Newark ADU need a public hearing?
No. ADUs are approved ministerially without a hearing, and the city decides within 60 days of a complete application. Most ADUs need only a building permit.
What design rules apply to a detached ADU in Newark?
The ADU must match the house’s wall and roof colors, have no entrance or outside stairs on the street-facing front wall, use downward lighting and have a permanent foundation. Second-story windows near a neighbor’s line must be obscured or have high sills.
Who builds two-ADU projects in Newark?
Axiom Renovation designs, permits and builds ADUs in Newark and is planning two-unit projects for 2027. Call 408-702-2022, Monday to Friday, 9 am to 5 pm.
Sources: AB 956 (Quirk-Silva), signed September 29, 2026, effective January 1, 2027, as summarized by Brownstein Hyatt Farber Schreck and California YIMBY; Newark Ordinance 563; Newark ADU page. This page is general information, not legal advice. Local rules change; we confirm current requirements with the city for every project.