Marin County · Zoning · A30
Marin County A30 zoning: height, setbacks and lot size
In Marin County's A30 zone, generally buildings can be up to 30 ft tall, the front setback is 50 ft and the minimum lot size is 30 acres, with the conditions listed below (Marin County code, read October 2026).
Key points
- Maximum building height: 30 ft (primary buildings; accessory buildings are limited to 16 ft)
- Minimum front setback: 50 ft
- Minimum side setback: 50 ft
- Minimum rear setback: 50 ft
- Minimum lot size: 30 acres (May be waived to allow clustering of single-family dwellings; total lots may not exceed the number the minimum lot area allows.)
- Maximum floor area ratio (FAR): 0.05
A30 is a zoning district in Marin County. Every value below was read from the Marin 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 A30
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 | 30 ft Applies: primary buildings; accessory buildings are limited to 16 ft § 22.08.040 · code textTable row “A30”, column “Primary”: 30 ft. |
|---|---|
| Minimum front setback | 50 ft § 22.08.040 · code textTable row “A30”, column “Front”: 50 ft. |
| Minimum side setback | 50 ft § 22.08.040 · code textTable row “A30”, column “Sides”: 50 ft. |
| Minimum rear setback | 50 ft § 22.08.040 · code textTable row “A30”, column “Rear”: 50 ft. |
| Minimum lot size | 30 acres Applies: May be waived to allow clustering of single-family dwellings; total lots may not exceed the number the minimum lot area allows. The code attaches note 1 to this value. This page does not show it; read the code before relying on the number. § 22.08.040 · code textTable row “A30”, column “Minimum Lot Area (1)”: 30 acres |
| Maximum floor area ratio (FAR) | 0.05 The code attaches note 7 to this value. This page does not show it; read the code before relying on the number. § 22.08.040 · code textTable row “A30”, column “Maximum FAR (7)”: 0.05 |
Not on this page
We did not find a general stories, lot coverage, density limit for A30 in the zoning tables we read. The code may still set one elsewhere — check the Marin County Municipal Code.
Other Marin County zoning districts
Who this affects
Frequently asked questions
What is the maximum building height in Marin County's A30 zone?
30 ft (primary buildings; accessory buildings are limited to 16 ft) — Marin County Municipal Code § 22.08.040.
What is the minimum front setback in Marin County's A30 zone?
50 ft — Marin County Municipal Code § 22.08.040.
What is the minimum side setback in Marin County's A30 zone?
50 ft — Marin County Municipal Code § 22.08.040.
What is the minimum rear setback in Marin County's A30 zone?
50 ft — Marin County Municipal Code § 22.08.040.
What is the minimum lot size in Marin County's A30 zone?
30 acres (may be waived to allow clustering of single-family dwellings; total lots may not exceed the number the minimum lot area allows) — Marin County Municipal Code § 22.08.040. The code attaches notes or conditions to this value; read the section before relying on it.
General information, not legal advice.
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