California ADU rules · Santa Clara County
Can I Build an ADU in Saratoga?
Yes — you can build an ADU in Saratoga. California's statewide ADU law requires every city, including Saratoga, to approve a qualifying accessory dwelling unit by right, plus a junior ADU (JADU) on a single-family lot. What varies city to city are the local specifics below.
Can you build one?
ADUs allowed
CA state lawYes — by right
ADUs and JADUs are allowed by right in all residential and mixed-use zones; ministerial approval, no hearing.
Units on a single-family lot
Local rule1 ADU (attached or detached) + up to 2 JADUs within the single-family dwelling or accessory structure
Allows up to 2 JADUs per single-family lot, exceeding state baseline.
Units on a multifamily lot
Local ruleConversions: at least 1 or up to 25% of units (rounded up) + up to 2 detached ADUs
Detached ADUs on multifamily lots capped at 2, less than state baseline of 8.
Junior ADU (JADU)
Local ruleAllowed
JADUs allowed within existing or proposed single-family dwelling or accessory structure.
Size & height
Max detached ADU size
Local rule1,200 sq ft
Local cap is 1,200 sq ft unless within setbacks, then at least 800 sq ft must be allowed.
Max attached ADU size
Local rule50% of existing or concurrently approved living area, up to 1,200 sq ft; at least 800 sq ft must be allowed
Local cap is 1,200 sq ft for attached ADUs.
Guaranteed minimum size
CA state law800 sq ft
An 800 sq ft ADU must be allowed regardless of FAR/lot-coverage caps; a city also cannot cap an attached ADU below 850 sq ft (1,000 for 2+ bedrooms).
Max JADU size
CA state law500 sq ft
Max height
CA state law16 ft
16 ft baseline; cities must allow 18 ft within ½ mi of a major transit stop or where the primary dwelling is two-story, and 20 ft on a lot with a multistory multifamily building.
Setbacks
Side setback
Local rule4 ft
4 ft for detached ADUs; attached ADUs follow primary dwelling setbacks.
Rear setback
Local rule4 ft
4 ft for detached ADUs; attached ADUs follow primary dwelling setbacks.
Front setback
Local ruleUnderlying zoning applies; city cannot prohibit at least one 800 sq ft ADU with 4-ft side/rear setbacks
Front setback per base zone, but state minimum applies for at least one ADU.
Separation from main house
Local ruleNone required
No specific separation required beyond building/fire code.
Parking
Parking required
Local ruleUp to 1 space
1 off-street space per ADU, with multiple exemptions.
Transit parking exemption
Local ruleYes — no parking required near transit & for conversions
No parking required if within 1/2 mile of public transit.
Garage-conversion replacement parking
Local ruleNot required
No replacement required for lost parking when garage/carport is converted.
Approval, timeline & cost
Approval path
CA state lawMinisterial (by right)
No public hearing or discretionary design review for a qualifying ADU.
Approval timeline
CA state law60 days
The agency must act within 60 days of a complete application — and the ADU is deemed approved if it does not.
Owner-occupancy
Local ruleOnly for a JADU
Owner-occupancy required only for JADUs.
Impact-fee waiver
Local ruleWaived under 750 sq ft
ADUs up to 750 sq ft are exempt from impact fees.
Permits required
Local ruleBuilding permit
Building permit required; legalization process for existing units.
Saratoga-specific factors that can change the answer
State law sets the floor, but these local conditions often decide whether a specific parcel works.
Very High Fire Hazard Severity Zone (VHFHSZ)
Side/rear setbacks for conversions must be sufficient for fire safety as determined by the fire agency.
Historic district
No parking required for ADUs in historic districts.
Hillside lots
Must demonstrate no geologic hazard for hillside lots.
Saratoga allows up to 2 JADUs per single-family lot and limits detached ADUs on multifamily lots to 2. Height, parking, and setback rules are locally specified, with additional requirements for fire safety and hillside lots.
Frequently asked questions
Can I build an ADU in Saratoga?
Yes. California's statewide ADU law requires Saratoga to approve a qualifying accessory dwelling unit ministerial (by right), plus a junior ADU (JADU) on a single-family lot.
How big can an ADU be in Saratoga?
A detached ADU of at least 1,200 sq ft must be allowed, and an ADU of 800 sq ft can never be zoned out by floor-area or lot-coverage limits. A JADU can be up to 500 sq ft.
What are the setback requirements for an ADU in Saratoga?
Side and rear setbacks are limited to 4 ft. Underlying zoning applies; city cannot prohibit at least one 800 sq ft ADU with 4-ft side/rear setbacks.
Is parking required for an ADU in Saratoga?
Up to 1 space. No parking can be required within ½ mile of transit, for conversions, or for units inside the primary home. When a garage is converted, replacement parking is not required.
How long does ADU approval take in Saratoga?
A complete application must be acted on within 60 days, with ministerial (by right) — no public hearing or discretionary design review for a qualifying ADU.
Do I have to live on the property to build an ADU in Saratoga?
Owner-occupancy: only for a jadu. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- Saratoga Municipal Code Article 15-56 (last amended April 3, 2024; some sections updated October 15, 2024)
- §15-56.020, §15-56.030
- §15-56.035(b)(2)
- §15-56.025(a)(3)
- §15-56.025(a)(5)
- §15-56.025; default to building code
- §15-56.025(a)(7)
- §15-56.025(a)(7)(c), §15-56.035(b)(1)(b)
- §15-56.035(a)
- §15-56.025(c)
- §15-56.050
- §15-56.035(b)(1)(v)
- §15-56.050(d)
- Cal. Gov. Code §§ 66310–66342 (ADU Law)
- HCD 2025 Accessory Dwelling Unit Handbook
- Cal. Gov. Code § 66317 (ministerial approval, 60-day deadline)
- Cal. Gov. Code § 66321 (size minimums & height)
- Cal. Gov. Code § 66333 (junior ADUs)
Last updated 2026-06-25. This is an AI-assisted summary of Saratoga's ADU rules, drawn from its published ordinance and California ADU law — general information, not legal advice, and it may be incomplete or out of date. Verify the controlling rule for your specific parcel with Saratoga Planning before relying on it.
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