Title 8 — ZONING›Division 84 — LAND USE DISTRICTS
Chapter 84-20 — R-100 SINGLE-FAMILY RESIDENTIAL DISTRICT
Contra Costa County Municipal Code · 2026-09 edition · updated 2026-10-02 · Contra Costa County
84-20.202 - General provisions.¶
All land within an R-100 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: Ord. 1549: prior code § 8148.7 (part)).
Article 84-20.4. Uses
84-20.402 - Uses—Permitted.¶
Uses permitted in the R-100 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: Ord. 1549: prior code § 8148.7(a)).
84-20.404 - Uses—Requiring land use permit.¶
In the R-100 district, the following uses are permitted subject to the issuance of a land use permit: Same as those designated for the R-65 district in Section 84-18.404.
(Ord. 1768: Ord. 1569: Ord. 1549: prior code § 8148.7(b)).
Article 84-20.6. Lots
84-20.602 - Lot—Area.¶
No single-family dwelling or other structure permitted in the R-l00 district shall be erected or placed on a lot smaller than one hundred thousand square feet in area.
(Ord. 1768: Ord. 1569: Ord. 1549: prior code § 8148.7(c)).
84-20.604 - Lot—Width.¶
No single-family dwelling or other structure permitted in the R-100 district shall be erected or placed on a lot less than two hundred feet in average width.
(Ord. 1768: Ord. 1569: Ord. 1549: prior code § 8148.7(d)).
84-20.606 - Lot—Depth.¶
No single-family dwelling or other structure permitted in the R-100 district shall be erected on a lot less than two hundred feet deep.
(Ord. 1768: Ord. 1569: Ord. 1549: prior code § 8148.7(e)).
Article 84-20.8. Building Height
84-20.802 - Building height—Maximum.¶
Building height provisions for the R-100 district shall be the same as those for the R-6 district (Section 84- 4.802).
(Ord. 1768: Ord. 1569: Ord. 1549: prior code § 8148.7(f)).
Article 84-20.10. Yards
84-20.1002 - Yard—Side.
There shall be an aggregate side yard width of at least sixty feet. No side yard shall be less than thirty feet wide. These minima may be reduced to three feet for an accessory building or structure if it is set back at least sixty-five feet from the front property line.
(Ord. 1768: Ord. 1569: Ord. 1549: prior code § 8148.7(g)).
84-20.1004 - Yard—Setback.
There shall be a setback (front yard) of at least thirty feet for any structure in the R-100 district; on corner lots, the principal frontage of the lot shall have a setback of at least thirty feet and the other setback shall be at least twenty-five feet.
(Ord. 1768: Ord. 1569: Ord. 1549: prior code § 8148.7(h)).
84-20.1006 - Yard—Rear.
There shall be a rear yard for any principal structure of at least thirty feet. There shall be a rear yard for accessory structures of at least three feet.
(Ord. 1768: Ord. 1569: Ord. 1549: prior code § 8148.7(i)).
Article 84-20.12. Off-Street Parking
84-20.1202 - Off-street parking—Space requirements.
Off-street parking provisions for the R-100 district shall be the same as those for the R-6 district (Section 84-4.1202).
(Ord. 71-59 §§ 4, 5, 1971: Ord. 1768: Ord. 1569: Ord. 1549: prior code § 8148.7(j)).
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