San Joaquin County · Zoning · AU
San Joaquin County AU zoning: height, setbacks and lot size
In San Joaquin County's AU zone, generally buildings can be up to 40 ft tall, the front setback is 30 ft and the minimum lot size is 20 acres, with the conditions listed below (San Joaquin County code, read October 2026).
Key points
- Maximum building height: 40 ft (Dwellings)
- Minimum front setback: 30 ft (Front and street side yards; 55 ft where the right-of-way is less than 50 ft)
- Minimum side setback: 10 ft (Interior Side—Main Structure)
- Minimum rear setback: 30 ft (Rear—Main Structure)
- Minimum lot size: 20 acres
AU (Agricultural-Urban Reserve) is a zoning district in San Joaquin County. Every value below was read from the San Joaquin County Municipal Code and links to its section (read October 2026). State laws such as the ADU and SB 9 rules can allow more on a residential lot. General information, not legal advice — read the code text and check with the city before you build.
Development standards in AU
The general rule for a typical lot in this zone. Zoning tables often attach notes, such as rules for corner lots, lots next to a residential zone, or new subdivisions only. Open “code text” under a value to see the table cell or sentence it was read from.
| Maximum building height | 40 ft Applies: Dwellings § 9-203.030 · code textTable row “Dwellings”, column “AU”: 40 |
|---|---|
| Minimum front setback | 30 ft Applies: Front and street side yards; 55 ft where the right-of-way is less than 50 ft § 9-203.030 · code textTable row “Front and Street Side Regular; Right-of-Way less than 50 ft.”, column “AU”: 30; 55 8 |
| Minimum side setback | 10 ft Applies: Interior Side—Main Structure § 9-203.030 · code textTable row “Interior Side—Main Structure; Accessory Structures”, column “AU”: 10 |
| Minimum rear setback | 30 ft Applies: Rear—Main Structure § 9-203.030 · code textTable row “Rear—Main Structure; Accessory Structures; Reverse Corner Lots”, column “AU”: 30; 15; 10 |
| Minimum lot size | 20 acres § 9-203.030 · code textTable row “Minimum Lot Size (acres)”, column “AU”: 20 |
Uses in AU
Uses the code's use tables allow in AU, or allow with a permit. Each links to its page with the code section.
- Single-family home — Allowed
When a different number applies
The code sets other values for particular lots, buildings or locations in AU:
- Maximum building height: 22 ft — Buildings accessory to dwellings § 9-203.030
Not on this page
We did not find a general stories, lot coverage, FAR, density limit for AU in the zoning tables we read. The code may still set one elsewhere — check the San Joaquin County Municipal Code.
Other San Joaquin County zoning districts
Who this affects
Frequently asked questions
What is the maximum building height in San Joaquin County's AU zone?
40 ft (dwellings) — San Joaquin County Municipal Code § 9-203.030.
What is the minimum front setback in San Joaquin County's AU zone?
30 ft (front and street side yards; 55 ft where the right-of-way is less than 50 ft) — San Joaquin County Municipal Code § 9-203.030.
What is the minimum side setback in San Joaquin County's AU zone?
10 ft (interior Side—Main Structure) — San Joaquin County Municipal Code § 9-203.030.
What is the minimum rear setback in San Joaquin County's AU zone?
30 ft (rear—Main Structure) — San Joaquin County Municipal Code § 9-203.030.
What is the minimum lot size in San Joaquin County's AU zone?
20 acres — San Joaquin County Municipal Code § 9-203.030.
General information, not legal advice.
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