Rialto MHD zoning: height, setbacks and lot size

MHD (Mobile Home Development Zone) is a zoning district in Rialto. Every value below was read from the Rialto 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 MHD

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	25 ft § 18.100.080 · code text No building shall exceed twenty-five feet in height.
Minimum front setback	10 ft Applies: Mobile home lots § 18.100.080 · code text Front yard: Ten feet;
Minimum side setback	5 ft Applies: Mobile home lots; measured from the mobile home or other listed structure to the mobile home lot line § 18.100.080 · code text Side yard: Five feet measured from the mobile home, carport, cabana, ramada, awning, porch, canopy or any other structure to the mobile home lot line.
Minimum rear setback	5 ft Applies: Mobile home lots § 18.100.080 · code text Rear yard: Five feet, where the rear yard abuts a residential zone, the said rear yard shall be not less than ten feet.
Minimum lot size	4,400 sq ft Applies: Average area of mobile home spaces, net; the whole park site must be at least 10 acres § 18.100.080 · code text The minimum gross site area shall be ten acres as measured to the centerline of adjoining streets.
Maximum lot coverage	60% § 18.100.080 · code text Maximum lot coverage by a mobile home and accessory structures shall not exceed sixty percent of the lot area.

When a different number applies

The code sets other values for particular lots, buildings or locations in MHD:

Minimum front setback: 20 ft — Mobile home developments: from the ultimate right-of-way of any public street § 18.100.080
Minimum side setback: 20 ft — Mobile home developments: from the ultimate right-of-way of any public street § 18.100.080
Minimum side setback: 10 ft — Where the side yard abuts a mobile home park street, public parking area or walkway § 18.100.080
Minimum rear setback: 20 ft — Mobile home developments: from the ultimate right-of-way of any public street § 18.100.080
Minimum rear setback: 10 ft — Where the rear yard abuts a residential zone § 18.100.080

Not on this page

We did not find a general stories, FAR, density limit for MHD in the zoning tables we read. The code may still set one elsewhere — check the Rialto Municipal Code.

Other Rialto zoning districts

Who this affects

HomeownersArchitects and designersDevelopersReal estate agents

Frequently asked questions

What is the maximum building height in Rialto's MHD zone?

25 ft — Rialto Municipal Code § 18.100.080.

What is the minimum front setback in Rialto's MHD zone?

10 ft (mobile home lots) — Rialto Municipal Code § 18.100.080.

What is the minimum side setback in Rialto's MHD zone?

5 ft (mobile home lots; measured from the mobile home or other listed structure to the mobile home lot line) — Rialto Municipal Code § 18.100.080.

What is the minimum rear setback in Rialto's MHD zone?

5 ft (mobile home lots) — Rialto Municipal Code § 18.100.080.

What is the minimum lot size in Rialto's MHD zone?

4,400 sq ft (average area of mobile home spaces, net; the whole park site must be at least 10 acres) — Rialto Municipal Code § 18.100.080.

General information, not legal advice.