Diamond Bar RH-30 zoning: height, setbacks and lot size

RH-30 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 RH-30

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 5 below the table in the code. § 22.08.040 · code text Table row “Height limit (5)”, column “RH-30”: 35 ft. Note 5: Maximum allowable height for structures. See section 22.16.060 (Height measurement and height limit exceptions).
Minimum lot size	5 acres Applies: For parcels in new subdivisions; condominium, townhome and planned development projects may have smaller ownership parcels See note 1 below the table in the code. § 22.08.040 · code text Table row “Minimum lot area (1)”, column “RH-30”: 5 acres Note 1: Minimum area for parcels proposed in new subdivisions, except as otherwise provided by section 22.08.050 (Minimum lot area), and chapter 22.22 (Hillside Management). Condominium, townhome, 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 over
Maximum lot coverage	60% § 22.08.040 · code text Table row “Lot Coverage”, column “RH-30”: 60 percent
Maximum density	30 dwellings per net site acre See note 2 below the table in the code. § 22.08.040 · code text Table row “Residential density (2)”, column “RH-30”: Maximum: 30 dwellings per net site acre Minimum: 20 dwellings per net site acre Note 2: Maximum number of dwellings allowed for each specified unit of land. The approval of a conditional use permit within areas subject to section 22.22.040 (Hillside management—Density) may result in fewer dwelling units being allowed than the maximum density shown. See also chapter 22.18 (Affordable Housing Incentives/Density Bonus Provisions) for possible density bonuses.

Uses in RH-30

Uses the code's use tables allow in RH-30, or allow with a permit. Each links to its page with the code section.

Single-family home — Allowed
Duplex — Allowed
Child care center — Needs a conditional use permit
Private school — Needs a conditional use permit

Not on this page

We did not find a general stories, front setback, side setback, rear setback, FAR limit for RH-30 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

HomeownersArchitects and designersDevelopersReal estate agents

Frequently asked questions

What is the maximum building height in Diamond Bar's RH-30 zone?

35 ft — Diamond Bar Municipal Code § 22.08.040.

What is the minimum lot size in Diamond Bar's RH-30 zone?

5 acres (for parcels in new subdivisions; condominium, townhome and planned development projects may have smaller ownership parcels) — Diamond Bar Municipal Code § 22.08.040.

What is the maximum lot coverage in Diamond Bar's RH-30 zone?

60% — Diamond Bar Municipal Code § 22.08.040.

What is the maximum density in Diamond Bar's RH-30 zone?

30 dwellings per net site acre — Diamond Bar Municipal Code § 22.08.040.

General information, not legal advice.