Diamond Bar · Zoning · OP
Diamond Bar OP zoning: height, setbacks and lot size
In Diamond Bar's OP zone, generally buildings can be up to 35 ft tall, the front setback is 20 ft and the minimum lot size is 6,000 sq. ft., with the conditions listed below (Diamond Bar code, read October 2026).
Key points
- Maximum building height: 35 ft
- Minimum front setback: 20 ft (or equal to the front setback of an abutting residential zone)
- Minimum side setback: None required (Unless the site abuts a residential district)
- Minimum rear setback: None required (Unless a residential zone abuts the site)
- Minimum lot size: 6,000 sq. ft. (Parcels proposed in new subdivisions; subject to the exception in section 22.08.050.)
OP is a zoning district in Diamond Bar. Every value below was read from the Diamond Bar 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 OP
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 See note 3 below the table in the code. § 22.10.040 · code textTable row “Height limit (3)”, column “OP”: 35 ft. Note 3: Maximum allowable height for structures. See section 22.16.060 (Height measurement and height limit exceptions). |
|---|---|
| Minimum front setback | 20 ft Applies: or equal to the front setback of an abutting residential zone § 22.10.040 · code textTable row “Front”, column “OP”: 20 ft.; or equal to the front setback required for a residential zone abutting the site. |
| Minimum side setback | None required Applies: Unless the site abuts a residential district § 22.10.040 · code textTable row “Sides (each)”, column “OP”: 10 ft. where site abuts a residential district; none otherwise. |
| Minimum rear setback | None required Applies: Unless a residential zone abuts the site § 22.10.040 · code textTable row “Rear”, column “OP”: Equal to the rear setback required for a residential zone abutting the site, with a minimum of 10 ft. landscaped; none otherwise. |
| Minimum lot size | 6,000 sq. ft. Applies: Parcels proposed in new subdivisions; subject to the exception in section 22.08.050. See note 1 below the table in the code. § 22.10.040 · code textTable row “Minimum lot area (1)”, column “OP”: 6,000 sq. ft. Note 1: Minimum area for parcels proposed in new subdivisions, except as otherwise provided by section 22.08.050 (Minimum lot area). Commercial condominium or planned development projects may be subdivided with smaller parcel sizes for ownership purposes, with the minimum lot area requirement determined through the subdivision review process, provided that the overall development site complies with the lo |
Uses in OP
Uses the code's use tables allow in OP, or allow with a permit. Each links to its page with the code section.
- Child care center — Needs a conditional use permit
- Private school — Needs a conditional use permit
When a different number applies
The code sets other values for particular lots, buildings or locations in OP:
- Minimum front setback: Equal to the front setback required for a residential zone abutting the site — When the site abuts a residential zone. § 22.10.040
- Minimum side setback: 10 ft — Where the site abuts a residential district. § 22.10.040
- Minimum rear setback: Equal to the rear setback required for a residential zone abutting the site, with a minimum of 10 ft. landscaped — Where a residential zone abuts the site. § 22.10.040
- Maximum floor area ratio (FAR): 1.00 — Range is 0.25 to 1.00; the review authority may allow a higher FAR within that range for amenities § 22.10.040
Not on this page
We did not find a general stories, lot coverage, FAR, density limit for OP in the zoning tables we read. The code may still set one elsewhere — check the Diamond Bar Municipal Code.
Other Diamond Bar zoning districts
Who this affects
Frequently asked questions
What is the maximum building height in Diamond Bar's OP zone?
35 ft — Diamond Bar Municipal Code § 22.10.040.
What is the minimum front setback in Diamond Bar's OP zone?
20 ft (or equal to the front setback of an abutting residential zone) — Diamond Bar Municipal Code § 22.10.040.
What is the minimum side setback in Diamond Bar's OP zone?
None required (unless the site abuts a residential district) — Diamond Bar Municipal Code § 22.10.040.
What is the minimum rear setback in Diamond Bar's OP zone?
None required (unless a residential zone abuts the site) — Diamond Bar Municipal Code § 22.10.040.
What is the minimum lot size in Diamond Bar's OP zone?
6,000 sq. ft. (parcels proposed in new subdivisions; subject to the exception in section 22.08.050) — Diamond Bar Municipal Code § 22.10.040.
General information, not legal advice.
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