Title 8 — ZONING & DEVELOPMENT CODE
Chapter 8.16 — R1, ONE-FAMILY RESIDENTIAL DISTRICTS
San Mateo County Zoning Code · 2026-06 edition · ingested 2026-07-06 · San Mateo County
8.16.010 – Regulations for “R-1” District. ¶
The following regulations shall apply in all “R-1” districts and shall be subject to all applicable provisions of Article 2 (Development Procedures) and Article 3 (General Development Standards) of Title 8.
8.16.020 - Uses Permitted. ¶
(a) One-family dwellings.
(b) Public parks and public playgrounds.
(c) Crop and tree farming and truck gardening.
(d) Home occupations.
(e) Accessory buildings and accessory uses appurtenant to a residential use, provided, however, that such accessory buildings shall not be constructed until the main building shall have been constructed.
(f) (1) Keeping of pets in association with a one-family dwelling.
- (2) Limited keeping of pets in association with a second unit.
(g) (1) Animal Fanciers in association with a one-family dwelling, subject to an animal fanciers' permit issued in accordance with County Ordinance Code, Title 6, Chapter 6.16 .
(2) Catteries in association with a one-family dwelling, subject to a kennel/cattery permit issued in accordance with County Ordinance Code, Title 6, Chapter 6.20.
(3) On parcels of at least 2,500 sq. ft. in size, and in compliance with the conditions set forth in Title 8, Chapter 8.380 of the San Mateo County Ordinance Code, the keeping of no more than six (6) of the following domestic poultry: chicken and ducks. Roosters are prohibited.
On parcel sizes exceeding 7,500 sq. ft., and in compliance with the conditions set forth in Title 8, Chapter 8.380 of the San Mateo County Ordinance Code, the keeping of no more than ten (10) of the following domestic poultry: chicken and ducks. Roosters are prohibited.
(h) Reverse vending machines at public facilities.
(i) Small collection facilities for recyclable materials at public facilities, subject to obtaining a building permit, provided that there is no additional mechanical processing equipment on site, that collection facilities shall not be located within 50 feet of a residence, nor decrease traffic or pedestrian circulation or the required number of onsite parking spaces for the primary use, and all litter and loose debris shall be removed on a daily basis.
(j) The following uses subject to securing a use permit in each case:
Churches, schools, libraries and fire stations.
Golf courses with standard length fairways and country clubs.
Non-commercial clubs.
Nurseries and greenhouses used only for the propagating and cultivating of plants, provided that no retail sales shall be allowed. The granting of such use permits shall generally be confined to those areas of the County in which the nurseries and greenhouses are already established, and use permits granted to applicants presently operating such greenhouses and nurseries shall normally cover the proposed future development of all property owned or controlled by the applicant.
A second residential unit on a parcel at least 7,000 sq. ft. in size in the Coastal Zone.
(k) Keeping of confined animals.
(m) In the Coastal Zone, Short-Term Rentals, subject to a short-term rental permit issued in accordance with County Zoning Regulations, Chapter 8.368.
(Prior Code § 6161(f); Ord 3423 – 11/10/92)
(Prior Code § 6161(g); Ord 3423 – 11/10/92)
(Prior Code § 6161(g)(3); Ord 4511 – 07/27/10)
(Prior Code § 6161(h): Ord 1427 – 09/27/60)
(Prior Code § 6161(h)(5); Ord 2705 – 12/16/80)
(Prior Code § 6161(h); Ord 3131 – 12/15/87) (Prior Code § 6161(i); Ord 3131 – 12/15/87)
(Prior Code § 6161(h), (i), (j); Ord 3157 – 09/13/88) (Prior Code § 6161(i); Ord 3791 – 10/21/97) (Prior Code § 6161(i); Ord 3791 – 10/21/97)
(Prior Code § 6161(i); Ord 4844 – 05/04/21)
(Prior Code § 6161(I); Ord 4075 – 12/06/01)
(Prior Code § 6161(m); Ord 4777 , 06/06/2017)
8.16.030 - Second Dwelling Units. ¶
See Chapter 8.392 and 8.392 (Coastal Zone) for provisions to allow second dwelling units to locate in the R-1 Zoning Districts.
(Prior Code § 6162, 6163, 6164; Ord 1483 – 10/10/61)
(Prior Code § 6162; Ord 2877 – 01/24/84)
(Prior Code § 6162; Ord 3057 – 03/04/86)