Riverside County · Zoning · M-R-A
Riverside County M-R-A zoning: height, setbacks and lot size
In Riverside County's M-R-A zone, generally buildings can be up to 50 ft tall, the front setback is 50 ft and the minimum lot size is 5 acres, with the conditions listed below (Riverside County code, read October 2026).
Key points
- Maximum building height: 50 ft (unless a greater height is approved under section 17.172.230)
- Minimum front setback: 50 ft (any use except those in section 17.116.010(A); structures over 50 ft high need yards equal to their height)
- Minimum side setback: 50 ft (any use except those in section 17.116.010(A); structures over 50 ft high need yards equal to their height)
- Minimum rear setback: 50 ft (any use except those in section 17.116.010(A); structures over 50 ft high need yards equal to their height)
- Minimum lot size: 5 acres
M-R-A (Mineral Resources and Related Manufacturing Zone) is a zoning district in Riverside County. Every value below was read from the Riverside 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 M-R-A
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 | 50 ft Applies: unless a greater height is approved under section 17.172.230 § 17.116.020 · code textNo building or structure shall exceed fifty (50) feet in height, unless a greater height is approved pursuant to section 17.172.230. |
|---|---|
| Minimum front setback | 50 ft Applies: any use except those in section 17.116.010(A); structures over 50 ft high need yards equal to their height § 17.116.020 · code textYards: front, rear and side, not less than fifty (50) feet for any use permitted except those uses permitted in section 17.116.010(A); provided further, however, that any structure exceeding fifty (50) feet in height shall have front, side and rear yard spaces equal to the height of the structure. |
| Minimum side setback | 50 ft Applies: any use except those in section 17.116.010(A); structures over 50 ft high need yards equal to their height § 17.116.020 · code textYards: front, rear and side, not less than fifty (50) feet for any use permitted except those uses permitted in section 17.116.010(A); provided further, however, that any structure exceeding fifty (50) feet in height shall have front, side and rear yard spaces equal to the height of the structure. |
| Minimum rear setback | 50 ft Applies: any use except those in section 17.116.010(A); structures over 50 ft high need yards equal to their height § 17.116.020 · code textYards: front, rear and side, not less than fifty (50) feet for any use permitted except those uses permitted in section 17.116.010(A); provided further, however, that any structure exceeding fifty (50) feet in height shall have front, side and rear yard spaces equal to the height of the structure. |
| Minimum lot size | 5 acres § 17.116.020 · code textLot area: not less than five acres gross. |
When a different number applies
The code sets other values for particular lots, buildings or locations in M-R-A:
- Maximum building height: 75 ft — upper limit for a building unless a variance is approved § 17.116.020
- Maximum building height: 105 ft — upper limit for any other structure unless a variance is approved § 17.116.020
Not on this page
We did not find a general stories, lot coverage, FAR, density limit for M-R-A in the zoning tables we read. The code may still set one elsewhere — check the Riverside County Municipal Code.
Other Riverside County zoning districts
Who this affects
Frequently asked questions
What is the maximum building height in Riverside County's M-R-A zone?
50 ft (unless a greater height is approved under section 17.172.230) — Riverside County Municipal Code § 17.116.020.
What is the minimum front setback in Riverside County's M-R-A zone?
50 ft (any use except those in section 17.116.010(A); structures over 50 ft high need yards equal to their height) — Riverside County Municipal Code § 17.116.020.
What is the minimum side setback in Riverside County's M-R-A zone?
50 ft (any use except those in section 17.116.010(A); structures over 50 ft high need yards equal to their height) — Riverside County Municipal Code § 17.116.020.
What is the minimum rear setback in Riverside County's M-R-A zone?
50 ft (any use except those in section 17.116.010(A); structures over 50 ft high need yards equal to their height) — Riverside County Municipal Code § 17.116.020.
What is the minimum lot size in Riverside County's M-R-A zone?
5 acres — Riverside County Municipal Code § 17.116.020.
General information, not legal advice.
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