Two Detached ADUs in Saratoga (AB 956, 2027)
Plan Two ADUs in Saratoga: Free Site Assessment
Saratoga ADU rules today (2026)
From January 1, 2027, state law (AB 956) requires the City of Saratoga to approve up to two detached ADUs on a lot with a single-family home. Saratoga’s hillside lots and septic-served properties add review steps that matter for any backyard unit. Here is how the new law and the city’s current ADU rules fit together.
Saratoga’s ADU rules are in Zoning Article 15-56 (Ord. 376, 2020, amended by Ord. 399 and Ord. 405 in 2024).
- Units allowed now: the city’s ADU code allows one ADU and up to two JADUs within the house or an existing accessory structure, plus one detached new-construction ADU.
- Size: a detached ADU outside the setbacks may be up to 1,200 sq ft. An 800 sq ft unit with 4 ft setbacks is always allowed. An attached ADU is capped at 50% of the house, up to 1,200 sq ft. A JADU may be up to 500 sq ft. Basements and attics count as floor area.
- Height: 16 ft detached, or 18 ft near transit, plus 2 ft for roof pitch.
- Setbacks: 4 ft side and rear for a detached ADU; front per district, unless that blocks an 800 sq ft unit.
- Parking: one space unless exempt, such as near transit or for a conversion. No replacement for a converted garage.
- Process: Community Development decides ministerially within 60 days.
State review of Saratoga's ADU rules
In May 2023, the state housing department (HCD) found Saratoga’s 2020 ordinance out of compliance, citing a one-ADU-plus-JADU cap, height in setbacks, a bedroom cap and entrance rules. In December 2025 HCD sent a technical-assistance letter on deed restrictions, HOAs, JADU parking, completeness timelines and sprinklers. A city response was not found. Where local rules are stricter than state law, state law applies.
Recent Axiom work
Professional photos from a recent Axiom Renovation full remodel and addition in Los Gatos.
What changes on January 1, 2027
AB 956 requires the city to approve up to two detached new-construction ADUs on a single-family lot. The city may cap each at 800 sq ft of living space and apply height limits; side and rear setbacks can be no more than 4 ft. Where two detached ADUs are built, a JADU need not be approved, and HOA rules cannot block or unreasonably restrict the units. Saratoga allows one detached ADU today, so AB 956 adds a second. The city’s guaranteed 800 sq ft unit with 4 ft setbacks lines up with the new state size, while larger 1,200 sq ft units may not apply to the two-unit option. The city will need to update Article 15-56, and we confirm current rules as it does.
Planning two detached ADUs on a Saratoga lot
- Hillside lots: the city may ask for a topographic map with contours at 5 ft or less, and a geologic report, to show there is no landslide hazard.
- Septic: units served by septic need County Health approval. The owner records an agreement to connect to sewer when it becomes available.
- Fire hazard zones: in very high fire hazard severity zones, setbacks must satisfy the fire agency.
- Floor area: basements and attics count toward ADU size, so two units need careful planning.
- Electrical: two units usually need a load calculation and often a service upgrade.
Building ADUs in Saratoga with Axiom
See our Saratoga ADU guide and Saratoga service area, read the AB 956 overview, or compare neighboring Los Gatos and Cupertino.
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.
Saratoga Two-ADU FAQ
Can I build two detached ADUs in Saratoga?
From January 1, 2027, AB 956 requires the city to approve up to two detached, new-construction ADUs on a lot with a single-family home, if the project meets objective standards. Until then, Saratoga allows one detached ADU plus an ADU and up to two JADUs within existing space.
How large can each ADU be in Saratoga?
Today a detached ADU outside the setbacks can be up to 1,200 sq ft, and an 800 sq ft unit with 4 ft setbacks is always allowed. 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 Saratoga?
16 ft, or 18 ft near transit, plus 2 ft for a roof pitch that matches the house.
Can I build an ADU on a septic lot in Saratoga?
Yes, with County Health approval. The owner also records an agreement to connect to sewer when it becomes available.
What does Saratoga require on hillside lots?
The city may require a topographic map and a geologic report to show there is no landslide or geologic hazard.
Who builds two-ADU projects in Saratoga?
Axiom Renovation designs, permits and builds ADUs in Saratoga 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. This page is general information, not legal advice. Local rules change; we confirm current requirements with the city for every project.