Chapter 3 — AGRICULTURAL ZONES: LOT AND STRUCTURE REGULATIONS
Mountain House Zoning Code · 2026-06 edition · updated 2026-07-25 · Mountain House
Sections in this part
9-6-301 - Intent. ¶
The intent of this Chapter is to regulate the size and width of individual lots, but not zones; the location and height of structures on lots; and the physical character and intensity of lot usage within the agricultural zones consistent with the policies and principles of the General Plan.
(Ord. 2024-18, § 1(Exh. A), 2024)
9-6-302 - Lot Area. ¶
Lots in the agricultural zones shall have the minimum areas set forth in Table 9-6-3.1, except as modified by Section 9-6-303.
(Ord. 2024-18, § 1(Exh. A), 2024)
9-6-303 - Area Exceptions. ¶
The following exceptions to the minimum lot area regulations in Table 9-6-3.1 are permitted:
(a)
Homesite Parcels. Homesite parcels may be approved in the AG zone, provided all of the following provisions are satisfied:
(1)
Not more than one (1) homesite parcel may be created from an existing parcel; however, under no circumstances shall the number of parcels resulting from the division exceed the maximum number of parcels permissible under the General Plan density. In determining how many homesite parcels have been created from an existing parcel, all homesite parcels created from an existing parcel since July 29, 1992, the date of the adoption of the General Plan, shall be counted;
(2)
The homesite parcel shall contain not less than two (2) acres nor more than five (5) acres. A homesite parcel created from property under Williamson Act contract shall also comply with Section 66474.4 of the Government Code, which permits the creation of such homesite parcels provided a residence has existed on the property proposed to be divided for five (5) years and the property owner has owned the property for ten (10) years;
(3)
A Minor Subdivision application proposing the creation of a homesite parcel from an existing parcel shall not be approved by the Review Authority if the owner of the existing parcel has owned the existing parcel for less than ten (10) years. If the Minor Subdivision application is approved, the homesite parcel which is created shall not be transferred for a period of ten (10) years following the date of its approval or upon the death of an owner owning at least fifty (50) percent interest in the homesite parcel, unless the homesite parcel and the remainder parcel are merged pursuant to the provisions of this Title.
(4)
A building permit for a single-family dwelling for each homesite parcel shall be issued concurrently with the filing for record of the parcel map.
(5)
After the creation of a homesite parcel under this subsection, no further homesite parcels may be created on the remainder parcel except for financing purposes as set forth below in subsection (b).
(b)
Homesite Parcels for Financing Purposes Only. Homesite parcels created for financing purposes only may be approved in the AG zone, provided all of the following provisions are satisfied:
(1)
Neither the homesite parcel nor the remainder parcel may be voluntarily transferred separately from the other parcel; however, if an institutional lender forecloses on either parcel, either parcel may be transferred separately in accordance with the power of sale provisions contained in the deed of trust;
(2)
Upon repayment of the loan, the owner of the homesite parcel shall merge the homesite parcel with the remainder parcel, as provided for in this Title, unless the owner of the homesite parcel acquired the homesite parcel through a foreclosure action, or unless the owner refinances the loan.
(3)
The remainder parcel shall remain a nonbuildable site for primary dwelling units.
(4)
All homesite parcels created for financing purposes only shall contain not less than two (2) acres nor more than five (5) acres.
(c)
Homesite and remainder parcels approved under the provisions of subsections (a) and (b) above shall have a notice recorded by separate instrument concurrently with the parcel map to indicate the restrictions specified in said subsection. A note shall also be placed on the parcel map indicating said restrictions with a reference to the instrument number of said recorded notice. The restrictions specified in this subsection shall terminate if the subject property is reclassified to a nonagricultural zone or to an agricultural zone with a five (5) acre minimum.
(d)
Parcels for Certain Specified Uses. Parcels containing less area than the minimum required in Table 9-6-3.1 may be created for the purpose of providing a separate lot for an existing use or a use granted by permit in the AG zone, subject to the following conditions:
(1)
The existing use, or use granted by permit, is classified under one (1) or more of the following use types:
(A)
Agricultural Processing;
(B)
Agricultural Organizations;
(C)
Agricultural Sales;
(D)
Agricultural Warehousing;
(E)
Animal Feeding and Sales;
(F)
Animal Specialty Services, Farm;
(G)
Educational Services, General;
(H)
Equipment Sales and Repair:
(i)
Farm Machinery, Sales, and
(ii)
Farm Machinery, Repair.
(I)
Major Impact Services;
(J)
Nursery Sales and Services: Wholesale;
(K)
Public Services;
(L)
Recreation:
(i)
Campgrounds; and
(ii)
Marinas.
(M)
Religious Assembly;
(N)
Stables;
(O)
Utility Services;
(P)
Farm Services;
(Q)
Limited Agricultural Recycling;
(R)
Custom Agricultural Manufacturing; and
(S)
Aerial Services-Farm.
(2)
The parcel to be created will be reduced to the least area required to conduct the operation;
(3)
The remainder parcel shall meet the minimum lot area requirements specified in Table 9-6-3.1;
(4)
A dwelling unit may be allowed on such resulting parcels only as an accessory use; and
(5)
The proposed subdivision of property complies with Sections 51230.1 and 66474.4 of the Government Code if the property to be divided is under a Williamson Act Contract.
(e)
Parcels For Dwellings on Same Lot. Two (2) parcels, each containing one (1) habitable single-family dwelling and each consisting of less area and/or width than required in Table 9-6-3.1, may be created from an original parcel for the purpose of providing a separate lot for each dwelling, subject to the following conditions:
(1)
The single-family dwellings were erected prior to February 9, 1961; and
(2)
The proposed subdivision of property complies with Sections 51230.1 and 66474.4 of the Government Code if the property to be divided is under a Williamson Act Contract.
(f)
Parcels Based on Lot-Size Averaging. Parcels of land containing up to ten (10) percent less area than the minimum area required in Table 9-6-3.1 may be created from an original parcel, subject to the following conditions:
(1)
The overall average parcel area of the proposed subdivision is equal to or greater than the minimum parcel area required in Table 9-6-3.1; and
(2)
The proposed subdivision of property complies with Sections 51230.1 and 66474.4 of the Government Code if the property to be divided is under a Williamson Act Contract.
(g)
AU Zoning in New Communities. Parcels zoned AU in a new or expanded community shall have, at minimum, a forty (40) acre lot area assigned to the AU zone. After the required Master Plan has been approved for the new or expanded community, the twenty (20) acre minimum may be assigned.
(Ord. 2024-18, § 1(Exh. A), 2024)
9-6-304 - Lot Width. ¶
Lots within the agricultural zones shall not have a width less than that set forth in Table 9-6-3.1.
(Ord. 2024-18, § 1(Exh. A), 2024)
9-6-305 - Yard Dimensions. ¶
Yards within the agricultural zones shall have the minimum depths set forth in Table 9-6-3.1, except as modified below:
(a)
Reduction of Required Yards. Required yards may be reduced as follows:
(1)
If the subject lot has less width than the required width specified in Table 9-6-3.1, the side yard or street side yard may be reduced to ten percent (10%) of the width of the lot, provided the side yard is not less than four (4) feet in width and the street side yard is not less than ten (10) feet in width.
(2)
If the subject lot is less than seventy-five (75) feet in width, the street side yard may be reduced to ten (10) feet in width.
(b)
Structures within Required Yards. The following structures may be located in or extend within required yards, subject to the provisions specified:
(1)
Architectural features, subject to the provisions of Chapter 9-1010;
(2)
Screening, including fences and gates, subject to the provisions of Chapter 6 of Division 10 (Fencing and Screening) of this Title;
(3)
Additions to nonconforming single-family dwellings, subject to the provisions of Chapter 8 of Division 2; and
(4)
Structures adjacent to and associated with railroad spurs.
(Ord. 2024-18, § 1(Exh. A), 2024)
9-6-306 - Height. ¶
Buildings and structures within the agricultural zones shall not exceed the heights set forth in Table 9-6-3.1, except as provided by Chapter 2 of Division 10; screening devices, including fences, gates, and gateposts, shall comply with the height requirements specified in Chapter 2 of Division 10.
(Ord. 2024-18, § 1(Exh. A), 2024)
9-6-307 - Building Coverage. ¶
The percentage of the total area of any lot which may be occupied by buildings in the agricultural zones shall not exceed that set forth in Table 9-6-3.1.
(Ord. 2024-18, § 1(Exh. A), 2024)
9-6-308 - Minimum Dimensions of Corner Lots. ¶
For corner lots proposed after the adoption of this Title:
(a)
The minimum width shall be sixty-five (65) feet, and
(b)
The minimum depth shall be sixty-five (65) feet.
TABLE 9-6-3.1 STANDARDS FOR MINIMUM LOT AREA & WIDTH, YARD DIMENSIONS, HEIGHT, BUILDING COVERAGE, AND DEPTH:WIDTH RATIO[1]
| AG | AL | AU | ARM | |
|---|---|---|---|---|
| Lot Area (acres) | 2 | 3 | 4 | 9 |
| Lot Width (feet)5 | 330 | 200 | 330 | 330 |
| Yard Dimensions (feet)8 | ||||
| Front and Street Side - Regular | 30 | 30 | 30 | 30 |
| Front and Street Side - Right-of-Way less than 50′ | 55 | 55 | 55 | 55 |
| Side | 10 | 10 | 10 | 10 |
| Rear - Appurtenant to main buildings | 30 | 30 | 30 | 30 |
| Rear - Appurtenant to accessory buildings | 15 | 15 | 15 | 15 |
| Rear - Reverse corner lots | 10 | 10 | 10 | 10 |
| Height (feet)7 | ||||
| Dwellings | 356 | 356 | 35 | 356 |
| Buildings accessory to dwellings | 3510 | 3510 | 18 | 3510 |
| Other structures | none | none | none | none |
| Building Coverage (%) | N/A | N/A | N/A | N/A |
| Depth:Width Ratio6 | 4:1 | 4:1 | 4:1 | 4:1 |
Notes:
1
See Sections 9-6-302 through 9-6-308 for exceptions and modifications.
2
The following lot area provisions apply to the AG Zone:
(a)
Lots zoned "AG-20" shall be at least twenty (20) acres.
(b)
Lots zoned "AG-40" shall be at least forty (40) acres.
(c)
Lots zoned "AG-80" shall be at least eighty (80) acres.
(d)
Lots zoned "AG-160" shall be at least one hundred sixty (160) acres
3
The following lot area provisions apply to the AL Zone:
(a)
Lots zoned "AL-5" shall be at least five (5) acres.
(b)
Lots zoned "AL-10" shall be at least ten (10) acres.
4
The following lot area provisions apply to the AU Zone:
(a)
Lots zoned "AU-20" shall be at least twenty (20) acres.
(b)
Lots zoned "AU-40" shall be at least forty (40) acres.
(c)
Lots zoned "AU-80" shall be at least eighty (80) acres.
(d)
Lots zoned "AU-160" shall be at least one hundred sixty (160) acres.
5
For homesite parcels, the minimum lot width shall be one hundred fifty (150) feet.
6
See Section 9-9-209 for exceptions.
7
For parcels containing twenty (20) or more acres, there shall be no maximum height for dwellings.
8
The minimum setback from all property lines for dwellings over thirty-five (35) feet in height shall be twice the maximum height of the dwelling, with a minimum setback of one hundred fifty (150) feet.
9
(a)
Lots zoned "ARM-20" shall be at least twenty (20) acres.
(b)
Lots zoned "ARM-40" shall be at least forty (40) acres.
(c)
Lots zoned "ARM-80" shall be at least eighty (80) acres.
(d)
Lots zoned "ARM-160" shall be at least one hundred sixty (160) acres.
10
See Section 9-1005.3 for height criteria.
N/A Not applicable.
Setbacks for yards shall be measured from the planned ultimate right-of-way width of the roadway, as shown on the General Plan or applicable Specific Plan or Special Purpose Plan.
(Ord. 2024-18, § 1(Exh. A), 2024)
DIVISION 7. - OTHER ZONES
CHAPTER 1. - OTHER ZONES: INTENT AND ORGANIZATION
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- Title 9 — DEVELOPMENT TITLE
-
▸ Title 9 — DEVELOPMENT TITLE
Overview- § 9-1
- Chapter 2 — BASIC PROVISIONS OF DEVELOPMENT TITLE
- Chapter 3 — DEFINITIONS
- Chapter 5 — SUPPLEMENTARY REGULATIONS
- Chapter 3 — STAFF REVIEW PROCEDURE
- Chapter 6 — ALTERATION PROCEDURE
- Chapter 7 — REVOCATION PROCEDURE
- Chapter 10 — REASONABLE ACCOMMODATION
- Chapter 2 — RESIDENTIAL ZONES: USE REGULATIONS
- Chapter 3 — RESIDENTIAL ZONES: LOT AND STRUCTURE REGULATIONS
- Chapter 4 — RESIDENTIAL ZONES: DENSITY BONUS
- Chapter 3 — COMMERCIAL ZONES: LOT AND STRUCTURE REGULATIONS
- Chapter 3 — INDUSTRIAL ZONES: LOT AND STRUCTURE REGULATIONS
- Chapter 3 — OTHER ZONES: LOT AND STRUCTURE REGULATIONS
- Chapter 4 — PUBLIC FINANCING PLANS
- Chapter 5 — SPECIFIC PLANS
- Chapter 6 — DEVELOPMENT TITLE TEXT AMENDMENTS
- Chapter 22 — VOLUNTARY MERGERS
- Chapter 27 — TIME EXTENSIONS
- Chapter 3 — YARDS
- Chapter 5 — LANDSCAPING REGULATIONS
- Chapter 6 — FENCING AND SCREENING
- Part I — TRANSPORTATION NOISE SOURCES
- Part II — STATIONARY NOISE SOURCES
- Division 17 — SIGN REGULATIONS