Title 8 — ZONING›Division 84 — LAND USE DISTRICTS
Chapter 84-16 — R-40 SINGLE-FAMILY RESIDENTIAL DISTRICT
Contra Costa County Municipal Code · 2026-09 edition · updated 2026-10-02 · Contra Costa County
84-16.202 - General provisions.¶
All land within an R-40 single-family residential district may be used for any of the following uses, under the following regulations set forth in this chapter.
(Ord. 1768: Ord. 1569: prior code § 8148 (part): Ord. 1269: Ord. 1179).
Article 84-16.4. Uses
84-16.402 - Uses—Permitted.¶
Uses permitted in the R-40 district shall be: All those uses designated for the R-20 district in Section 84- 14.402.
(Ord. 68-25 § 2, 1968: Ord. 2033 § 1, 1966: Ord. 1768: Ord. 1569: prior code § 8148(a): Ord. 1269: Ord. 1179).
84-16.404 - Uses—Requiring land use permit.¶
In the R-40 district the following uses are permitted on the issuance of a land use permit: All the uses designated for the R-20 district in Section 84-14.404.
(Ord. 1768: Ord. 1569: prior code § 8148(b): Ord. 1269: Ord. 1179).
Article 84-16.6. Lots
84-16.602 - Lot—Area.¶
No single-family dwelling or other structure permitted in the R-40 district shall be erected or placed on a lot smaller than forty thousand square feet in area.
(Ord. 1768: Ord. 1569: prior code § 8148(c): Ord. 1269: Ord. 1179).
84-16.604 - Lot—Width.¶
No single-family dwelling or other structure permitted in the R-40 district shall be erected or placed on a lot less than one hundred forty feet deep in average width.
(Ord. 1768: Ord. 1569: prior code § 8148(d): Ord. 1269: Ord. 1179).
84-16.606 - Lot—Depth.¶
No single-family dwelling or other structure permitted in the R-40 district shall be erected or placed on a lot less than one hundred forty feet deep.
(Ord. 1768: Ord. 1569: prior code § 8148(e): Ord. 1269: Ord. 1179).
Article 84-16.8. Building Height
84-16.802 - Building height—Maximum.¶
Building height provisions for the R-40 district shall be the same as those for the R-6 district (Section 84- 4.802).
(Ord. 1768: Ord. 1569: prior code § 8148(f): Ord. 1269: Ord. 1179).
Article 84-16.10. Yards
84-16.1002 - Yard—Side.
There shall be an aggregate side yard width of at least forty feet wide. No side yard shall be less than twenty feet wide. These minima may be reduced to three feet for an accessory building or structure if it is
set back at least seventy-five feet from the front property line.
(Ord. 1768: Ord. 1569: prior code § 8148(g): Ord. 1269: Ord. 1179).
84-16.1004 - Yard—Setback.
Setback (front yard) provisions for the R-40 district shall be the same as those for the R-20 district (Section 84-14.1004).
(Ord. 1768: Ord. 1569: prior code § 8148(h): Ord. 1269: Ord. 1179).
84-16.1006 - Yard—Rear.
Rear yard provisions for the R-40 district shall be the same as those for the R-6 district (Sections 84- 4.1006).
(Ord. 1768: Ord. 1569: prior code § 8148(i): Ord. 1269: Ord. 1179).
Article 84-16.12. Off-Street Parking
84-16.1202 - Off-street parking—Space requirements.
Off-street parking provisions for the R-40 district shall be the same as those for the R-6 district (Section 84- 4.1202).
(Ord. 71-59 §§ 3, 4, 1971: Ord. 1768: Ord. 1569: prior code § 8148(j): Ord. 1269: Ord. 1179).
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