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City of San Mateo Municipal Code.


(a) Newly created parcels. Dwellings developed after the effective date of this title shall be developed on recorded parcels which meet the following prescribed standards:

Districts Minimum Parcel Area Minimum Parcel Width*
R1-A 10,000 sq. ft. 75 feet
R1-B 6,000 sq. ft. 60 feet
R1-C 5,000 sq. ft. 50 feet
* Parcel width is measured at the front setback line. In instances where the front setback line is curved, the parcel width shall be measured on the tangent to the midpoint of the front setback line.

(b) Existing substandard parcels. Dwellings may be erected on parcels which do not meet the minimum standards of section (a) above if the parcel was recorded under separate ownership from adjoining parcels prior to March 3, 1947, if the subdivision map was approved with exceptions or if a recorded parcel has received a certificate of compliance.

(c) Width at street frontage. All parcels shall provide a minimum width of thirty (30) feet on a recorded public street frontage, or on a street as designated by resolution pursuant to Section 17.04.010. However, less width may be provided, if a permanent access easement to a public street was either recorded prior to this title's effective date, or is approved by the City.