Title 8 — ZONING & DEVELOPMENT CODE

Chapter 8.170 — S73 DISTRICT (COMBINING DISTRICT, NORTH FAIR OAKS)

San Mateo County Zoning Code · 2026-06 edition · ingested 2026-07-06 · San Mateo County

8.170.010 Regulations For “S-73” Combining District (North Fair Oaks).

The following regulations shall apply in the single-family (R-1) residential zoning district with which the “S-73” District is combined.

In the case where a requirement, standard, or provision of this Chapter conflicts with another requirement, standard, or provision in the Zoning Regulations, including this Chapter, the most limiting provision shall take precedence and govern.

8.170.020. Building Site Width.

The minimum building site width shall be an average of 50 feet .

8.170.030 Building Site Area.

The minimum building site area shall be 5,000 sq. ft.

8.170.040 Development Density.

The maximum density of development shall be 8.7 dwelling units/net acre.

8.170.050 Building Setbacks.

The minimum building setbacks shall be:

Front: 20 feet

Sides: 10 feet - When the side property line fronts a public or private street

Rear: 20 feet

5 feet - All other cases

8.170.060 Building Site Coverage Area Ratio.

The maximum building site coverage area ratio shall be .50 (50%) and shall include all: (1) buildings, (2) accessory buildings, and (3) structures such as patios, decks, balconies, porches and other similar uses which are 18 inches or more above the ground, except fences/walls.

8.170.070 Building Floor Area.

The maximum building floor area shall be established according to the following table:

Building Site Area Maximum Floor Area ≤5,000 sq. ft. 2,600 sq. ft. >5,000 sq. ft. .26 (building site area - 5,000) + 2,600 sq. ft.

Floor area specifically includes: (1) the area of all stories of all main and accessory buildings on a building site as measured from the outside face of all exterior perimeter walls, (2) the area of all decks, porches, balconies, or other areas covered by a waterproof roof which extends four or more feet from exterior walls, and (3) the area of all garages and carports that exceed 400 sq. ft., but excludes uninhabitable attics and sub-grade basements.

8.170.080 Building Height.

The maximum building height shall be 28 feet, not to exceed two habitable stories . Building height shall be measured as the vertical distance from any point on the existing grade to the topmost point of the building immediately above. Chimneys, pipes, mechanical equipment, antennae, and other common facilities may extend beyond the respective maximum height to a maximum of 36 feet as required for safety or efficient operation.

8.170.090 Daylight Planes.

The daylight planes shall be established by measuring along the side setback lines a vertical distance of 16 feet from the existing grade and then inward at an angle of 45 degrees until a maximum height of 28 feet is reached.

Daylight planes shall not be applicable to the side setback line of the street-facing side of a corner parcel.

Certain architectural features shall be allowed to extend into all yard setback areas according to the provisions of Zoning Regulations Section 8.340.010.

Chimneys, pipes, mechanical equipment, antennae, and other common facilities may extend into the daylight plane up to a maximum of 36 feet as required for safety or efficient operation.

Additionally, architectural features, such as dormers or gables, shall be allowed to extend into the daylight plane of the side setbacks provided that: (1) they measure perpendicularly to the daylight plane no more than 20 feet in continuous or cumulative length on each side, and (2) they measure no more than 24 feet in height from the existing grade .

(Prior code § 6300.4.13 thru 6300.4.21 Ord. 3843; 08/04/98)

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