Folsom R-4 zoning: height, setbacks and lot size

R-4 (GENERAL APARTMENT DISTRICT) is a zoning district in Folsom. Every value below was read from the Folsom 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 R-4

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 § 17.18.130 · code text Building height limit requirement is four stories, but not to exceed fifty feet.
Maximum number of stories	4 stories § 17.18.130 · code text Building height limit requirement is four stories, but not to exceed fifty feet.
Minimum front setback	20 ft § 17.18.070 · code text Front yard requirement is twenty feet.
Minimum side setback	5 ft on one side and 10 ft on the other side Applies: corner lot street side: 20% of lot width, need not exceed 15 ft, but not less than 10 ft § 17.18.080 · code text The side yard requirement is five feet on one side of the lot and ten feet on the other side of the lot at the option of the owner, developer or subdivider, except that the side yard on the street side of each corner lot shall be not less than twenty percent of the lot width, but need not exceed fifteen feet; however, it cannot be less than ten feet.
Minimum rear setback	20% of lot depth, min 10 ft and max 20 ft § 17.18.090 · code text Rear yard requirement is twenty percent of lot depth, may not be less than ten feet and need not exceed twenty feet.
Minimum lot size	6,000 sq ft Applies: interior lots § 17.18.040 · code text Lot area requirements are six thousand square feet for interior lots; seven thousand five hundred square feet for corner lots.
Maximum lot coverage	60% § 17.18.060 · code text Maximum main building coverage is sixty percent of lot area.

When a different number applies

The code sets other values for particular lots, buildings or locations in R-4:

Minimum side setback: 20% of lot width, max 15 ft and min 10 ft — street side of each corner lot § 17.18.080
Minimum lot size: 7,500 sq ft — corner lots § 17.18.040

Not on this page

We did not find a general FAR, density limit for R-4 in the zoning tables we read. The code may still set one elsewhere — check the Folsom Municipal Code.

Other Folsom zoning districts

Who this affects

HomeownersArchitects and designersDevelopersReal estate agents

Frequently asked questions

What is the maximum building height in Folsom's R-4 zone?

50 ft — Folsom Municipal Code § 17.18.130.

What is the maximum number of stories in Folsom's R-4 zone?

4 stories — Folsom Municipal Code § 17.18.130.

What is the minimum front setback in Folsom's R-4 zone?

20 ft — Folsom Municipal Code § 17.18.070.

What is the minimum side setback in Folsom's R-4 zone?

5 ft on one side and 10 ft on the other side (corner lot street side: 20% of lot width, need not exceed 15 ft, but not less than 10 ft) — Folsom Municipal Code § 17.18.080.

What is the minimum rear setback in Folsom's R-4 zone?

20% of lot depth, min 10 ft and max 20 ft — Folsom Municipal Code § 17.18.090.

General information, not legal advice.