Chapter 8.150 — “S” DISTRICTS 1 to 13 (COMBINING DISTRICTS 1-13) — San Mateo County Zoning Code

8.150.010 - Regulations For “S” Districts 1 to 13. ¶

In any District with which is combined any “S” District, the following regulations as specified for the respective “S” Districts shall apply:

			TABLE 1	TABLE 1	TABLE 1	TABLE 1
District	Minimum Building Site		Minimum Lot Area Per Dwelling Unit (Sq. Ft.)	Minimum Yards Required			Maximum Height Permitted		Maximum Coverage Permitted (%)
	Average Width (Ft.)	Minimum Area (Ft.)		Front (Ft.)	Side (Ft.)	Rear (Ft.)	Storie s	Ft.
S-1	50	5,000	500	20	5	20	3	36	50
S-2	50	5,000	1,000	20	5	20	3	36	50
S-3	50	5,000	1,250	203	5	20	33	363	50
S-4	50	5,000	1,650	20	5	20	3	36	50
S-5	50	5,000	2,500	20	5	20	3	36	50
S-6	50	5,000	3,500	20	5	20	3	36	50
S-7	50	5,000	5,000	20	5	20	3	36	50
S-8	50	7,500	7,500	20	5	20	3	36	40
S-9	50	10,000	10,000	20	10	20	3	36	30
S-10	75	20,000	20,000	20	10	20	3	36	25
S-11	100	1 – 5 ac.1	1 – 5 ac.1	50	20	20	3	36	15
S-12	175	2 1/2 – 5 ac.1	2 1/2 – 5 ac.1	50	20	20	3	36	10
S-13	250	5 ac.1	5 ac.1	50	20	20	3	36	10
S-17	--2	--2	--2	--2	--2	--2	--2	--2	--2

1See Section 8.150.020 for precise lot area requirements in S-11 and S-12 Districts.

2See Chapter 8.154 for precise requirements in the S-17 District.

3For buildings on land zoned C-1/S-3 located in the Midcoast LCP Update Project Area, as shown by the Midcoast Project Area Zoning Map the following provisions shall apply:

(a) Buildings with No Residential Units Maximum Height Permitted – 28 feet.
(b) Buildings with Residential Units – One of the following provisions shall apply, as determined by the property owner:
- (1) Maximum Front Yard Required – None. Maximum Height Permitted – 28 feet; or
- (2) Maximum Front Yard Required – 20 feet. Maximum Height Permitted – 32 feet.

Maximum coverage limitations shall apply to all structures except:

(a) Structures in C, H, M, or P Districts in which there are no dwelling facilities.
(b) Greenhouses, lathhouses, or other structures used exclusively for flower growing.

(Prior code § Chapter 20 Amd. Ord. 1483 10/10/61)

(Prior code § 6300 Amd. Ord. 1681; 10/10/64)

(Prior code § 6300 Amd. Ord. 1706; 06/22/65)

(Prior code § 6300 Amd. Ord. 2012;12/11/69)

(Prior code § 6300 Amd. Ord. 2379; 07/20/76)

(Prior code § 6300 Amd. Ord. 2862; 12/13/83)

(Prior code § 6300 Amd. Ord. 2868; 12/20/83)

(Prior code § 6300 (Table 1 Con’t) ) Rep. Ord. 3470; 02/02/93)

(Prior code § 6300 Amd. Ord. 4557; 05/24/11 Cert. by CA Coast Commission 08/08/12; eff in Coastal Zone 09/07/12)

8.150.020 - Lot Slope Regulations. ¶

The following additional regulations for determining lot area requirements and lots per gross acre shall apply in S-11 and S-12 Districts.

TABLE 2

TABLE 2	TABLE 2	TABLE 2	TABLE 2	TABLE 2	TABLE 2
	LOT	AREA REQUIREMENTS FOR S-11 DISTRICTS*

Slope Category In Percent	Gross Area Acres Per Dwelling Unit	Required Minimum Lot Area In Acres	Slope Category In Percent	Gross Area Acres Per Dwelling Unit	Required Minimum Lot Area In Acres
	(1)	(2)		(1)	(2)
---	---	---	---	---	---
1 & under	1.14	1.00	26	1.91	1.52
2	1.16	1.00	27	1.97	1.61
3	1.18	1.00	28	2.02	1.69
4	1.20	1.00	29	2.08	1.77
5	1.22	1.00	30	2.14	1.86
6	1.24	1.00	31	2.21	1.94
7	1.26	1.00	32	2.28	2.03
8	1.29	1.00	33	2.36	2.12
9	1.31	1.00	34	2.44	2.19
10	1.33	1.00	35	2.53	2.27
11	1.36	1.00	36	2.62	2.36
12	1.39	1.00	37	2.72	2.45
13	1.42	1.00	38	2.83	2.55
14	1.44	1.00	39	2.95	2.66
15	1.47	1.00	40	3.07	2.78
16	1.51	1.00	41	3.21	2.91
17	1.54	1.00	42	3.37	3.05
18	1.57	1.00	43	3.54	3.20
19	1.61	1.00	44	3.72	3.38
20	1.65	1.00	45	3.93	3.57
21	1.68	1.09	46	4.16	3.79
22	1.73	1.18	47	4.42	4.03
23	1.77	1.26	48	4.71	4.31
24	1.81	1.34	49	5.05	4.63
25	1.86	1.43	50 & over	5.43	5.00
*S-12 Districts shall be subject to this regulation when slope category indicates minimum lot size greater than 2 1/2 acres.

Slope category is determined by the average ground slope which is calculated by the following formula:

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Where I = interval of measured contours S = average ground slope of parcel

L = combined length of contours in feet
- (i.e., map measurement of contours in inches X scale)
A = area of parcel in acres

Where a parcel being subdivided contains lands in excess of 50% slope, such lands may be treated separately from the rest of the parcel and the number of dwelling units permissible on the 50% and over lands may be added to the number permissible on the balance of the parcel to obtain the total permissible on the entire parcel.

For the purpose of providing flexibility of design in subdivisions, individual lots may be as much as fifteen percent (15%) smaller than indicated in Column Two, provided that the total number of lots within the parcel being subdivided does not exceed the number determined from Column One and provided further that no lot contains less than one (1) acre.