Marin County · Zoning · AP
Marin County AP zoning: height, setbacks and lot size
In Marin County's AP zone, generally buildings can be up to 35 ft tall, the front setback is 25 ft and the minimum lot size is 7,500 sq. ft., with the conditions listed below (Marin County code, read October 2026).
Key points
- Maximum building height: 35 ft
- Minimum front setback: 25 ft
- Minimum side setback: 6 ft (1-story building)
- Minimum rear setback: 20 ft
- Minimum lot size: 7,500 sq. ft. (May change when combined with a -B district, or in areas of sloping terrain.)
- Maximum density: 1 unit per 1,450 sq. ft. of lot area
AP 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 AP
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 | 35 ft § 22.12.040 · code textTable row “AP”, column “Primary”: 35 ft. |
|---|---|
| Minimum front setback | 25 ft § 22.12.040 · code textTable row “AP”, column “Front”: 25 ft. |
| Minimum side setback | 6 ft Applies: 1-story building § 22.12.040 · code textTable row “AP”, column “Sides”: 6 ft. for 1-story building, 10 ft. for multi-story building, or on street side |
| Minimum rear setback | 20 ft § 22.12.040 · code textTable row “AP”, column “Rear”: 20 ft. |
| Minimum lot size | 7,500 sq. ft. Applies: May change when combined with a -B district, or in areas of sloping terrain. The code attaches note 1 to this value. This page does not show it; read the code before relying on the number. § 22.12.040 · code textTable row “AP”, column “Minimum Lot Area (1)”: 7,500 sq. ft. |
| Maximum density | 1 unit per 1,450 sq. ft. of lot area § 22.12.040 · code textTable row “AP”, column “Maximum Residential Density (2)”: 1 unit per 1,450 sq. ft. of lot area |
Uses in AP
Uses the code's use tables allow in AP, or allow with a permit. Each links to its page with the code section.
- Duplex — Allowed — see note
- Rooming or boarding house — Allowed
- Child care center — Needs an use permit (conditional use permit or master use permit)
- Community garden — Allowed
When a different number applies
The code sets other values for particular lots, buildings or locations in AP:
- Minimum side setback: 10 ft — multi-story building, or on street side § 22.12.040
Not on this page
We did not find a general stories, lot coverage, FAR limit for AP 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 AP zone?
35 ft — Marin County Municipal Code § 22.12.040.
What is the minimum front setback in Marin County's AP zone?
25 ft — Marin County Municipal Code § 22.12.040.
What is the minimum side setback in Marin County's AP zone?
6 ft (1-story building) — Marin County Municipal Code § 22.12.040.
What is the minimum rear setback in Marin County's AP zone?
20 ft — Marin County Municipal Code § 22.12.040.
What is the minimum lot size in Marin County's AP zone?
7,500 sq. ft. (may change when combined with a -B district, or in areas of sloping terrain) — Marin County Municipal Code § 22.12.040. 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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