Seal Beach · Zoning · RMD-18
Seal Beach RMD-18 zoning: height, setbacks and lot size
In Seal Beach's RMD-18 zone, generally the front setback is average 12 ft; minimum 6 ft and the minimum lot size is 5,000 sq. ft., with the conditions listed below (Seal Beach code, read October 2026).
Key points
- Minimum front setback: average 12 ft; minimum 6 ft
- Minimum side setback: 10% of lot width, 3 ft minimum, 10 ft maximum
- Minimum rear setback: 5 ft (when abutting an alley: 24 ft minus the width of the alley)
- Minimum lot size: 5,000 sq. ft. (Interior Lots; minimum lot area)
- Maximum lot coverage: 50%
- Maximum density: 1 unit per 2,500 sq. ft. of lot area
RMD-18 is a zoning district in Seal Beach. Every value below was read from the Seal Beach 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 RMD-18
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.
| Minimum front setback | average 12 ft; minimum 6 ft § 11.2.05.015 · code textTable row “Front - Minimum”, column “RMD-18”: Average 12; minimum 6 |
|---|---|
| Minimum side setback | 10% of lot width, 3 ft minimum, 10 ft maximum § 11.2.05.015 · code textTable row “Interior Side - Minimum”, column “RMD-18”: 10% of lot width; 3 ft. minimum; 10 ft. maximum |
| Minimum rear setback | 5 ft Applies: when abutting an alley: 24 ft minus the width of the alley § 11.2.05.015 · code textTable row “Rear”, column “RMD-18”: 5 ft.; but when abutting an alley 24 ft. minus width of the alley |
| Minimum lot size | 5,000 sq. ft. Applies: Interior Lots; minimum lot area § 11.2.05.015 · code textTable row “Interior Lots”, column “RMD-18”: 5,000 |
| Maximum lot coverage | 50% § 11.2.05.015 · code textTable row “Maximum Lot Coverage (%)”, column “RMD-18”: 50 |
| Maximum density | 1 unit per 2,500 sq. ft. of lot area § 11.2.05.015 · code textTable row “Maximum Density”, column “RMD-18”: 1 unit per 2,500 sq. ft. of lot area |
When a different number applies
The code sets other values for particular lots, buildings or locations in RMD-18:
- Minimum rear setback: 24 ft minus width of alley — When abutting an alley § 11.2.05.015
Not on this page
We did not find a general height, stories, FAR limit for RMD-18 in the zoning tables we read. The code may still set one elsewhere — check the Seal Beach Municipal Code.
Other Seal Beach zoning districts
Who this affects
Frequently asked questions
What is the minimum front setback in Seal Beach's RMD-18 zone?
average 12 ft; minimum 6 ft — Seal Beach Municipal Code § 11.2.05.015.
What is the minimum side setback in Seal Beach's RMD-18 zone?
10% of lot width, 3 ft minimum, 10 ft maximum — Seal Beach Municipal Code § 11.2.05.015.
What is the minimum rear setback in Seal Beach's RMD-18 zone?
5 ft (when abutting an alley: 24 ft minus the width of the alley) — Seal Beach Municipal Code § 11.2.05.015.
What is the minimum lot size in Seal Beach's RMD-18 zone?
5,000 sq. ft. (interior Lots; minimum lot area) — Seal Beach Municipal Code § 11.2.05.015.
What is the maximum lot coverage in Seal Beach's RMD-18 zone?
50% — Seal Beach Municipal Code § 11.2.05.015.
General information, not legal advice.
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